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   1 #!/usr/bin/env python
   2 #
   3 # Copyright 2004,2005,2007 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GNU Radio
   6 #
   7 # GNU Radio is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3, or (at your option)
  10 # any later version.
  11 #
  12 # GNU Radio is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with GNU Radio; see the file COPYING.  If not, write to
  19 # the Free Software Foundation, Inc., 51 Franklin Street,
  20 # Boston, MA 02110-1301, USA.
  21 #
  22
  23 from gnuradio import gr, gru
  24 from gnuradio import usrp
  25 from usrpm import usrp_dbid
  26 from gnuradio import eng_notation
  27 from gnuradio.eng_option import eng_option
  28 from gnuradio.wxgui import stdgui2, ra_fftsink, ra_stripchartsink, ra_waterfallsink, form, slider
  29 from optparse import OptionParser
  30 import wx
  31 import sys
  32 import Numeric
  33 import time
  34 import numpy.fft
  35 import ephem
  36
  37 class app_flow_graph(stdgui2.std_top_block):
  38         def __init__(self, frame, panel, vbox, argv):
  39                 stdgui2.std_top_block.__init__(self, frame, panel, vbox, argv)
  40
  41                 self.frame = frame
  42                 self.panel = panel
  43
  44                 parser = OptionParser(option_class=eng_option)
  45                 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0, 0),
  46                         help="select USRP Rx side A or B (default=A)")
  47                 parser.add_option("-d", "--decim", type="int", default=16,
  48                         help="set fgpa decimation rate to DECIM [default=%default]")
  49                 parser.add_option("-f", "--freq", type="eng_float", default=None,
  50                         help="set frequency to FREQ", metavar="FREQ")
  51                 parser.add_option("-a", "--avg", type="eng_float", default=1.0,
  52                         help="set spectral averaging alpha")
  53                 parser.add_option("-i", "--integ", type="eng_float", default=1.0,
  54                         help="set integration time")
  55                 parser.add_option("-g", "--gain", type="eng_float", default=None,
  56                         help="set gain in dB (default is midpoint)")
  57                 parser.add_option("-l", "--reflevel", type="eng_float", default=30.0,
  58                         help="Set Total power reference level")
  59                 parser.add_option("-y", "--division", type="eng_float", default=0.5,
  60                         help="Set Total power Y division size")
  61                 parser.add_option("-e", "--longitude", type="eng_float", default=-76.02,help="Set Observer Longitude")
  62                 parser.add_option("-c", "--latitude", type="eng_float", default=44.85,help="Set Observer Latitude")
  63                 parser.add_option("-o", "--observing", type="eng_float", default=0.0,
  64                         help="Set observing frequency")
  65                 parser.add_option("-x", "--ylabel", default="dB", help="Y axis label")
  66                 parser.add_option("-z", "--divbase", type="eng_float", default=0.025, help="Y Division increment base")
  67                 parser.add_option("-v", "--stripsize", type="eng_float", default=2400, help="Size of stripchart, in 2Hz samples")
  68                 parser.add_option("-F", "--fft_size", type="eng_float", default=1024, help="Size of FFT")
  69                 parser.add_option("-N", "--decln", type="eng_float", default=999.99, help="Observing declination")
  70                 parser.add_option("-X", "--prefix", default="./")
  71                 parser.add_option("-M", "--fft_rate", type="eng_float", default=8.0, help="FFT Rate")
  72                 parser.add_option("-A", "--calib_coeff", type="eng_float", default=1.0, help="Calibration coefficient")
  73                 parser.add_option("-B", "--calib_offset", type="eng_float", default=0.0, help="Calibration coefficient")
  74                 parser.add_option("-W", "--waterfall", action="store_true", default=False, help="Use Waterfall FFT display")
  75                 parser.add_option("-S", "--setimode", action="store_true", default=False, help="Enable SETI processing of spectral data")
  76                 parser.add_option("-K", "--setik", type="eng_float", default=1.5, help="K value for SETI analysis")
  77                 parser.add_option("-T", "--setibandwidth", type="eng_float", default=12500, help="Instantaneous SETI observing bandwidth--must be divisor of 250Khz")
  78                 parser.add_option("-Q", "--seti_range", type="eng_float", default=1.0e6, help="Total scan width, in Hz for SETI scans")
  79                 parser.add_option("-Z", "--dual_mode", action="store_true",
  80                         default=False, help="Dual-polarization mode")
  81                 parser.add_option("-I", "--interferometer", action="store_true", default=False, help="Interferometer mode")
  82                 parser.add_option("-D", "--switch_mode", action="store_true", default=False, help="Dicke Switching mode")
  83                 parser.add_option("-P", "--reference_divisor", type="eng_float", default=1.0, help="Reference Divisor")
  84                 parser.add_option("-U", "--ref_fifo", default="@@@@")
  85                 (options, args) = parser.parse_args()
  86
  87                 self.setimode = options.setimode
  88                 self.dual_mode = options.dual_mode
  89                 self.interferometer = options.interferometer
  90                 self.normal_mode = False
  91                 self.switch_mode = options.switch_mode
  92                 self.switch_state = 0
  93                 self.reference_divisor = options.reference_divisor
  94                 self.ref_fifo = options.ref_fifo
  95
  96                 if (self.ref_fifo != "@@@@"):
  97                         self.ref_fifo_file = open (self.ref_fifo, "w")
  98
  99                 modecount = 0
 100                 for modes in (self.dual_mode, self.interferometer):
 101                         if (modes == True):
 102                                 modecount = modecount + 1
 103
 104                 if (modecount > 1):
 105                         print "must select only 1 of --dual_mode, or --interferometer"
 106                         sys.exit(1)
 107
 108                 self.chartneeded = True
 109
 110                 if (self.setimode == True):
 111                         self.chartneeded = False
 112
 113                 if (self.setimode == True and self.interferometer == True):
 114                         print "can't pick both --setimode and --interferometer"
 115                         sys.exit(1)
 116
 117                 if (self.setimode == True and self.switch_mode == True):
 118                         print "can't pick both --setimode and --switch_mode"
 119                         sys.exit(1)
 120
 121                 if (self.interferometer == True and self.switch_mode == True):
 122                         print "can't pick both --interferometer and --switch_mode"
 123                         sys.exit(1)
 124
 125                 if (modecount == 0):
 126                         self.normal_mode = True
 127
 128                 self.show_debug_info = True
 129
 130                 # Pick up waterfall option
 131                 self.waterfall = options.waterfall
 132
 133                 # SETI mode stuff
 134                 self.setimode = options.setimode
 135                 self.seticounter = 0
 136                 self.setik = options.setik
 137                 self.seti_fft_bandwidth = int(options.setibandwidth)
 138
 139                 # Calculate binwidth
 140                 binwidth = self.seti_fft_bandwidth / options.fft_size
 141
 142                 # Use binwidth, and knowledge of likely chirp rates to set reasonable
 143                 #  values for SETI analysis code.       We assume that SETI signals will
 144                 #  chirp at somewhere between 0.10Hz/sec and 0.25Hz/sec.
 145                 #
 146                 # upper_limit is the "worst case"--that is, the case for which we have
 147                 #  to wait the longest to actually see any drift, due to the quantizing
 148                 #  on FFT bins.
 149                 upper_limit = binwidth / 0.10
 150                 self.setitimer = int(upper_limit * 2.00)
 151                 self.scanning = True
 152
 153                 # Calculate the CHIRP values based on Hz/sec
 154                 self.CHIRP_LOWER = 0.10 * self.setitimer
 155                 self.CHIRP_UPPER = 0.25 * self.setitimer
 156
 157                 # Reset hit counters to 0
 158                 self.hitcounter = 0
 159                 self.s1hitcounter = 0
 160                 self.s2hitcounter = 0
 161                 self.avgdelta = 0
 162                 # We scan through 2Mhz of bandwidth around the chosen center freq
 163                 self.seti_freq_range = options.seti_range
 164                 # Calculate lower edge
 165                 self.setifreq_lower = options.freq - (self.seti_freq_range/2)
 166                 self.setifreq_current = options.freq
 167                 # Calculate upper edge
 168                 self.setifreq_upper = options.freq + (self.seti_freq_range/2)
 169
 170                 # Maximum "hits" in a line
 171                 self.nhits = 20
 172
 173                 # Number of lines for analysis
 174                 self.nhitlines = 4
 175
 176                 # We change center frequencies based on nhitlines and setitimer
 177                 self.setifreq_timer = self.setitimer * (self.nhitlines * 5)
 178
 179                 # Create actual timer
 180                 self.seti_then = time.time()
 181
 182                 # The hits recording array
 183                 self.hits_array = Numeric.zeros((self.nhits,self.nhitlines), Numeric.Float64)
 184                 self.hit_intensities = Numeric.zeros((self.nhits,self.nhitlines), Numeric.Float64)
 185                 # Calibration coefficient and offset
 186                 self.calib_coeff = options.calib_coeff
 187                 self.calib_offset = options.calib_offset
 188                 if self.calib_offset < -750:
 189                         self.calib_offset = -750
 190                 if self.calib_offset > 750:
 191                         self.calib_offset = 750
 192
 193                 if self.calib_coeff < 1:
 194                         self.calib_coeff = 1
 195                 if self.calib_coeff > 100:
 196                         self.calib_coeff = 100
 197
 198                 self.integ = options.integ
 199                 self.avg_alpha = options.avg
 200                 self.gain = options.gain
 201                 self.decln = options.decln
 202
 203                 # Set initial values for datalogging timed-output
 204                 self.continuum_then = time.time()
 205                 self.spectral_then = time.time()
 206
 207
 208                 # build the graph
 209
 210                 self.subdev = [(0, 0), (0,0)]
 211
 212                 #
 213                 # If SETI mode, we always run at maximum USRP decimation
 214                 #
 215                 if (self.setimode):
 216                         options.decim = 256
 217
 218                 if (self.dual_mode == False and self.interferometer == False):
 219                         self.u = usrp.source_c(decim_rate=options.decim)
 220                         self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
 221                         # determine the daughterboard subdevice we're using
 222                         self.subdev[0] = usrp.selected_subdev(self.u, options.rx_subdev_spec)
 223                         self.subdev[1] = self.subdev[0]
 224                         self.cardtype = self.subdev[0].dbid()
 225                 else:
 226                         self.u=usrp.source_c(decim_rate=options.decim, nchan=2)
 227                         self.subdev[0] = usrp.selected_subdev(self.u, (0, 0))
 228                         self.subdev[1] = usrp.selected_subdev(self.u, (1, 0))
 229                         self.cardtype = self.subdev[0].dbid()
 230                         self.u.set_mux(0x32103210)
 231                         c1 = self.subdev[0].name()
 232                         c2 = self.subdev[1].name()
 233                         if (c1 != c2):
 234                                 print "Must have identical cardtypes for --dual_mode or --interferometer"
 235                                 sys.exit(1)
 236                 #
 237                 # Set 8-bit mode
 238                 #
 239                 width = 8
 240                 shift = 8
 241                 format = self.u.make_format(width, shift)
 242                 r = self.u.set_format(format)
 243
 244                 # Set initial declination
 245                 self.decln = options.decln
 246
 247                 input_rate = self.u.adc_freq() / self.u.decim_rate()
 248
 249                 #
 250                 # Set prefix for data files
 251                 #
 252                 self.prefix = options.prefix
 253
 254                 #
 255                 # The lower this number, the fewer sample frames are dropped
 256                 #  in computing the FFT.  A sampled approach is taken to
 257                 #  computing the FFT of the incoming data, which reduces
 258                 #  sensitivity.  Increasing sensitivity inreases CPU loading.
 259                 #
 260                 self.fft_rate = options.fft_rate
 261
 262                 self.fft_size = int(options.fft_size)
 263
 264                 # This buffer is used to remember the most-recent FFT display
 265                 #       values.  Used later by self.write_spectral_data() to write
 266                 #       spectral data to datalogging files, and by the SETI analysis
 267                 #       function.
 268                 #
 269                 self.fft_outbuf = Numeric.zeros(self.fft_size, Numeric.Float64)
 270
 271                 #
 272                 # If SETI mode, only look at seti_fft_bandwidth
 273                 #       at a time.
 274                 #
 275                 if (self.setimode):
 276                         self.fft_input_rate = self.seti_fft_bandwidth
 277
 278                         #
 279                         # Build a decimating bandpass filter
 280                         #
 281                         self.fft_input_taps = gr.firdes.complex_band_pass (1.0,
 282                            input_rate,
 283                            -(int(self.fft_input_rate/2)), int(self.fft_input_rate/2), 200,
 284                            gr.firdes.WIN_HAMMING, 0)
 285
 286                         #
 287                         # Compute required decimation factor
 288                         #
 289                         decimation = int(input_rate/self.fft_input_rate)
 290                         self.fft_bandpass = gr.fir_filter_ccc (decimation,
 291                                 self.fft_input_taps)
 292                 else:
 293                         self.fft_input_rate = input_rate
 294
 295                 # Set up FFT display
 296                 if self.waterfall == False:
 297                    self.scope = ra_fftsink.ra_fft_sink_c (panel,
 298                            fft_size=int(self.fft_size), sample_rate=self.fft_input_rate,
 299                            fft_rate=int(self.fft_rate), title="Spectral",
 300                            ofunc=self.fft_outfunc, xydfunc=self.xydfunc)
 301                 else:
 302                         self.scope = ra_waterfallsink.waterfall_sink_c (panel,
 303                                 fft_size=int(self.fft_size), sample_rate=self.fft_input_rate,
 304                                 fft_rate=int(self.fft_rate), title="Spectral", ofunc=self.fft_outfunc, size=(1100, 600), xydfunc=self.xydfunc, ref_level=0, span=10)
 305
 306                 # Set up ephemeris data
 307                 self.locality = ephem.Observer()
 308                 self.locality.long = str(options.longitude)
 309                 self.locality.lat = str(options.latitude)
 310
 311                 # We make notes about Sunset/Sunrise in Continuum log files
 312                 self.sun = ephem.Sun()
 313                 self.sunstate = "??"
 314
 315                 # Set up stripchart display
 316                 tit = "Continuum"
 317                 if (self.dual_mode != False):
 318                         tit = "H+V Continuum"
 319                 if (self.interferometer != False):
 320                         tit = "East x West Correlation"
 321                 self.stripsize = int(options.stripsize)
 322                 if self.chartneeded == True:
 323                         self.chart = ra_stripchartsink.stripchart_sink_f (panel,
 324                                 stripsize=self.stripsize,
 325                                 title=tit,
 326                                 xlabel="LMST Offset (Seconds)",
 327                                 scaling=1.0, ylabel=options.ylabel,
 328                                 divbase=options.divbase)
 329
 330                 # Set center frequency
 331                 self.centerfreq = options.freq
 332
 333                 # Set observing frequency (might be different from actual programmed
 334                 #        RF frequency)
 335                 if options.observing == 0.0:
 336                         self.observing = options.freq
 337                 else:
 338                         self.observing = options.observing
 339
 340                 # Remember our input bandwidth
 341                 self.bw = input_rate
 342
 343                 #
 344                 #
 345                 # The strip chart is fed at a constant 1Hz rate
 346                 #
 347
 348                 #
 349                 # Call constructors for receive chains
 350                 #
 351
 352                 if (self.dual_mode == True):
 353                         self.setup_dual (self.setimode)
 354
 355                 if (self.interferometer == True):
 356                         self.setup_interferometer(self.setimode)
 357
 358                 if (self.normal_mode == True):
 359                         self.setup_normal(self.setimode)
 360
 361                 if (self.setimode == True):
 362                         self.setup_seti()
 363
 364                 self._build_gui(vbox)
 365
 366                 # Make GUI agree with command-line
 367                 self.integ = options.integ
 368                 if self.setimode == False:
 369                         self.myform['integration'].set_value(int(options.integ))
 370                         self.myform['offset'].set_value(self.calib_offset)
 371                         self.myform['dcgain'].set_value(self.calib_coeff)
 372                 self.myform['average'].set_value(int(options.avg))
 373
 374
 375                 if self.setimode == False:
 376                         # Make integrator agree with command line
 377                         self.set_integration(int(options.integ))
 378
 379                 self.avg_alpha = options.avg
 380
 381                 # Make spectral averager agree with command line
 382                 if options.avg != 1.0:
 383                         self.scope.set_avg_alpha(float(1.0/options.avg))
 384                         self.scope.set_average(True)
 385
 386                 if self.setimode == False:
 387                         # Set division size
 388                         self.chart.set_y_per_div(options.division)
 389                         # Set reference(MAX) level
 390                         self.chart.set_ref_level(options.reflevel)
 391
 392                 # set initial values
 393
 394                 if options.gain is None:
 395                         # if no gain was specified, use the mid-point in dB
 396                         g = self.subdev[0].gain_range()
 397                         options.gain = float(g[0]+g[1])/2
 398
 399                 if options.freq is None:
 400                         # if no freq was specified, use the mid-point
 401                         r = self.subdev[0].freq_range()
 402                         options.freq = float(r[0]+r[1])/2
 403
 404                 # Set the initial gain control
 405                 self.set_gain(options.gain)
 406
 407                 if not(self.set_freq(options.freq)):
 408                         self._set_status_msg("Failed to set initial frequency")
 409
 410                 # Set declination
 411                 self.set_decln (self.decln)
 412
 413
 414                 # RF hardware information
 415                 self.myform['decim'].set_value(self.u.decim_rate())
 416                 self.myform['USB BW'].set_value(self.u.adc_freq() / self.u.decim_rate())
 417                 if (self.dual_mode == True):
 418                         self.myform['dbname'].set_value(self.subdev[0].name()+'/'+self.subdev[1].name())
 419                 else:
 420                         self.myform['dbname'].set_value(self.subdev[0].name())
 421
 422                 # Set analog baseband filtering, if DBS_RX
 423                 if self.cardtype in (usrp_dbid.DBS_RX, usrp_dbid.DBS_RX_REV_2_1):
 424                         lbw = (self.u.adc_freq() / self.u.decim_rate()) / 2
 425                         if lbw < 1.0e6:
 426                                 lbw = 1.0e6
 427                         self.subdev[0].set_bw(lbw)
 428                         self.subdev[1].set_bw(lbw)
 429
 430                 # Start the timer for the LMST display and datalogging
 431                 self.lmst_timer.Start(1000)
 432                 if (self.switch_mode == True):
 433                         self.other_timer.Start(330)
 434
 435
 436         def _set_status_msg(self, msg):
 437                 self.frame.GetStatusBar().SetStatusText(msg, 0)
 438
 439         def _build_gui(self, vbox):
 440
 441                 def _form_set_freq(kv):
 442                         # Adjust current SETI frequency, and limits
 443                         self.setifreq_lower = kv['freq'] - (self.seti_freq_range/2)
 444                         self.setifreq_current = kv['freq']
 445                         self.setifreq_upper = kv['freq'] + (self.seti_freq_range/2)
 446
 447                         # Reset SETI analysis timer
 448                         self.seti_then = time.time()
 449                         # Zero-out hits array when changing frequency
 450                         self.hits_array[:,:] = 0.0
 451                         self.hit_intensities[:,:] = -60.0
 452
 453                         return self.set_freq(kv['freq'])
 454
 455                 def _form_set_decln(kv):
 456                         return self.set_decln(kv['decln'])
 457
 458                 # Position the FFT display
 459                 vbox.Add(self.scope.win, 15, wx.EXPAND)
 460
 461                 if self.setimode == False:
 462                         # Position the Total-power stripchart
 463                         vbox.Add(self.chart.win, 15, wx.EXPAND)
 464
 465                 # add control area at the bottom
 466                 self.myform = myform = form.form()
 467                 hbox = wx.BoxSizer(wx.HORIZONTAL)
 468                 hbox.Add((7,0), 0, wx.EXPAND)
 469                 vbox1 = wx.BoxSizer(wx.VERTICAL)
 470                 myform['freq'] = form.float_field(
 471                         parent=self.panel, sizer=vbox1, label="Center freq", weight=1,
 472                         callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
 473
 474                 vbox1.Add((4,0), 0, 0)
 475
 476                 myform['lmst_high'] = form.static_text_field(
 477                         parent=self.panel, sizer=vbox1, label="Current LMST", weight=1)
 478                 vbox1.Add((4,0), 0, 0)
 479
 480                 if self.setimode == False:
 481                         myform['spec_data'] = form.static_text_field(
 482                                 parent=self.panel, sizer=vbox1, label="Spectral Cursor", weight=1)
 483                         vbox1.Add((4,0), 0, 0)
 484
 485                 vbox2 = wx.BoxSizer(wx.VERTICAL)
 486                 if self.setimode == False:
 487                         vbox3 = wx.BoxSizer(wx.VERTICAL)
 488                 g = self.subdev[0].gain_range()
 489                 myform['gain'] = form.slider_field(parent=self.panel, sizer=vbox2, label="RF Gain",
 490                                                                                    weight=1,
 491                                                                                    min=int(g[0]), max=int(g[1]),
 492                                                                                    callback=self.set_gain)
 493
 494                 vbox2.Add((4,0), 0, 0)
 495                 if self.setimode == True:
 496                         max_savg = 100
 497                 else:
 498                         max_savg = 3000
 499                 myform['average'] = form.slider_field(parent=self.panel, sizer=vbox2,
 500                                         label="Spectral Averaging (FFT frames)", weight=1, min=1, max=max_savg, callback=self.set_averaging)
 501
 502                 # Set up scan control button when in SETI mode
 503                 if (self.setimode == True):
 504                         # SETI scanning control
 505                         buttonbox = wx.BoxSizer(wx.HORIZONTAL)
 506                         self.scan_control = form.button_with_callback(self.panel,
 507                                   label="Scan: On ",
 508                                   callback=self.toggle_scanning)
 509
 510                         buttonbox.Add(self.scan_control, 0, wx.CENTER)
 511                         vbox2.Add(buttonbox, 0, wx.CENTER)
 512
 513                 vbox2.Add((4,0), 0, 0)
 514
 515                 if self.setimode == False:
 516                         myform['integration'] = form.slider_field(parent=self.panel, sizer=vbox2,
 517                                    label="Continuum Integration Time (sec)", weight=1, min=1, max=180, callback=self.set_integration)
 518
 519                         vbox2.Add((4,0), 0, 0)
 520
 521                 myform['decln'] = form.float_field(
 522                         parent=self.panel, sizer=vbox2, label="Current Declination", weight=1,
 523                         callback=myform.check_input_and_call(_form_set_decln))
 524                 vbox2.Add((4,0), 0, 0)
 525
 526                 if self.setimode == False:
 527                         myform['offset'] = form.slider_field(parent=self.panel, sizer=vbox3,
 528                                 label="Post-Detector Offset", weight=1, min=-750, max=750,
 529                                 callback=self.set_pd_offset)
 530                         vbox3.Add((2,0), 0, 0)
 531                         myform['dcgain'] = form.slider_field(parent=self.panel, sizer=vbox3,
 532                                 label="Post-Detector Gain", weight=1, min=1, max=100,
 533                                 callback=self.set_pd_gain)
 534                         vbox3.Add((2,0), 0, 0)
 535                 hbox.Add(vbox1, 0, 0)
 536                 hbox.Add(vbox2, wx.ALIGN_RIGHT, 0)
 537
 538                 if self.setimode == False:
 539                         hbox.Add(vbox3, wx.ALIGN_RIGHT, 0)
 540
 541                 vbox.Add(hbox, 0, wx.EXPAND)
 542
 543                 self._build_subpanel(vbox)
 544
 545                 self.lmst_timer = wx.PyTimer(self.lmst_timeout)
 546                 self.other_timer = wx.PyTimer(self.other_timeout)
 547
 548
 549         def _build_subpanel(self, vbox_arg):
 550                 # build a secondary information panel (sometimes hidden)
 551
 552                 # FIXME figure out how to have this be a subpanel that is always
 553                 # created, but has its visibility controlled by foo.Show(True/False)
 554
 555                 if not(self.show_debug_info):
 556                         return
 557
 558                 panel = self.panel
 559                 vbox = vbox_arg
 560                 myform = self.myform
 561
 562                 #panel = wx.Panel(self.panel, -1)
 563                 #vbox = wx.BoxSizer(wx.VERTICAL)
 564
 565                 hbox = wx.BoxSizer(wx.HORIZONTAL)
 566                 hbox.Add((5,0), 0)
 567                 myform['decim'] = form.static_float_field(
 568                         parent=panel, sizer=hbox, label="Decim")
 569
 570                 hbox.Add((5,0), 1)
 571                 myform['USB BW'] = form.static_float_field(
 572                         parent=panel, sizer=hbox, label="USB BW")
 573
 574                 hbox.Add((5,0), 1)
 575                 myform['dbname'] = form.static_text_field(
 576                         parent=panel, sizer=hbox)
 577
 578                 hbox.Add((5,0), 1)
 579                 myform['baseband'] = form.static_float_field(
 580                         parent=panel, sizer=hbox, label="Analog BB")
 581
 582                 hbox.Add((5,0), 1)
 583                 myform['ddc'] = form.static_float_field(
 584                         parent=panel, sizer=hbox, label="DDC")
 585
 586                 hbox.Add((5,0), 0)
 587                 vbox.Add(hbox, 0, wx.EXPAND)
 588
 589
 590
 591         def set_freq(self, target_freq):
 592                 """
 593                 Set the center frequency we're interested in.
 594
 595                 @param target_freq: frequency in Hz
 596                 @rypte: bool
 597
 598                 Tuning is a two step process.  First we ask the front-end to
 599                 tune as close to the desired frequency as it can.  Then we use
 600                 the result of that operation and our target_frequency to
 601                 determine the value for the digital down converter.
 602                 """
 603                 #
 604                 # Everything except BASIC_RX should support usrp.tune()
 605                 #
 606                 if not (self.cardtype == usrp_dbid.BASIC_RX):
 607                         r = usrp.tune(self.u, self.subdev[0]._which, self.subdev[0], target_freq)
 608                         r = usrp.tune(self.u, self.subdev[1]._which, self.subdev[1], target_freq)
 609                 else:
 610                         r = self.u.set_rx_freq(0, target_freq)
 611                         f = self.u.rx_freq(0)
 612                         if abs(f-target_freq) > 2.0e3:
 613                                 r = 0
 614                 if r:
 615                         self.myform['freq'].set_value(target_freq)         # update displayed value
 616                         #
 617                         # Make sure calibrator knows our target freq
 618                         #
 619
 620                         # Remember centerfreq---used for doppler calcs
 621                         delta = self.centerfreq - target_freq
 622                         self.centerfreq = target_freq
 623                         self.observing -= delta
 624                         self.scope.set_baseband_freq (self.observing)
 625
 626                         self.myform['baseband'].set_value(r.baseband_freq)
 627                         self.myform['ddc'].set_value(r.dxc_freq)
 628
 629                         return True
 630
 631                 return False
 632
 633         def set_decln(self, dec):
 634                 self.decln = dec
 635                 self.myform['decln'].set_value(dec)             # update displayed value
 636
 637         def set_gain(self, gain):
 638                 self.myform['gain'].set_value(gain)             # update displayed value
 639                 self.subdev[0].set_gain(gain)
 640                 self.subdev[1].set_gain(gain)
 641                 self.gain = gain
 642
 643         def set_averaging(self, avval):
 644                 self.myform['average'].set_value(avval)
 645                 self.scope.set_avg_alpha(1.0/(avval))
 646                 self.scope.set_average(True)
 647                 self.avg_alpha = avval
 648
 649         def set_integration(self, integval):
 650                 if self.setimode == False:
 651                         self.integrator.set_taps(1.0/((integval)*(self.bw/2)))
 652                 self.myform['integration'].set_value(integval)
 653                 self.integ = integval
 654
 655         #
 656         # Timeout function
 657         # Used to update LMST display, as well as current
 658         #  continuum value
 659         #
 660         # We also write external data-logging files here
 661         #
 662         def lmst_timeout(self):
 663                 self.locality.date = ephem.now()
 664                 if self.setimode == False:
 665                  x = self.probe.level()
 666                 sidtime = self.locality.sidereal_time()
 667                 # LMST
 668                 s = str(ephem.hours(sidtime)) + " " + self.sunstate
 669                 # Continuum detector value
 670                 if self.setimode == False:
 671                  sx = "%7.4f" % x
 672                  s = s + "\nDet: " + str(sx)
 673                 else:
 674                  sx = "%2d" % self.hitcounter
 675                  s1 = "%2d" % self.s1hitcounter
 676                  s2 = "%2d" % self.s2hitcounter
 677                  sa = "%4.2f" % self.avgdelta
 678                  sy = "%3.1f-%3.1f" % (self.CHIRP_LOWER, self.CHIRP_UPPER)
 679                  s = s + "\nHits: " + str(sx) + "\nS1:" + str(s1) + " S2:" + str(s2)
 680                  s = s + "\nAv D: " + str(sa) + "\nCh lim: " + str(sy)
 681
 682                 self.myform['lmst_high'].set_value(s)
 683
 684                 #
 685                 # Write data out to recording files
 686                 #
 687                 if self.setimode == False:
 688                  self.write_continuum_data(x,sidtime)
 689                  self.write_spectral_data(self.fft_outbuf,sidtime)
 690
 691                 else:
 692                  self.seti_analysis(self.fft_outbuf,sidtime)
 693                  now = time.time()
 694                  if ((self.scanning == True) and ((now - self.seti_then) > self.setifreq_timer)):
 695                          self.seti_then = now
 696                          self.setifreq_current = self.setifreq_current + self.fft_input_rate
 697                          if (self.setifreq_current > self.setifreq_upper):
 698                                  self.setifreq_current = self.setifreq_lower
 699                          self.set_freq(self.setifreq_current)
 700                          # Make sure we zero-out the hits array when changing
 701                          #       frequency.
 702                          self.hits_array[:,:] = 0.0
 703                          self.hit_intensities[:,:] = 0.0
 704
 705         def other_timeout(self):
 706                 if (self.switch_state == 0):
 707                         self.switch_state = 1
 708
 709                 elif (self.switch_state == 1):
 710                         self.switch_state = 0
 711
 712                 if (self.switch_state == 0):
 713                         self.mute.set_n(1)
 714                         self.cmute.set_n(int(1.0e9))
 715
 716                 elif (self.switch_state == 1):
 717                         self.mute.set_n(int(1.0e9))
 718                         self.cmute.set_n(1)
 719
 720                 if (self.ref_fifo != "@@@@"):
 721                         self.ref_fifo_file.write(str(self.switch_state)+"\n")
 722                         self.ref_fifo_file.flush()
 723
 724                 self.avg_reference_value = self.cprobe.level()
 725
 726                 #
 727                 # Set reference value
 728                 #
 729                 self.reference_level.set_k(-1.0 * (self.avg_reference_value/self.reference_divisor))
 730
 731         def fft_outfunc(self,data,l):
 732                 self.fft_outbuf=data
 733
 734         def write_continuum_data(self,data,sidtime):
 735
 736                 # Create localtime structure for producing filename
 737                 foo = time.localtime()
 738                 pfx = self.prefix
 739                 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
 740                    foo.tm_mon, foo.tm_mday, foo.tm_hour)
 741
 742                 # Open the data file, appending
 743                 continuum_file = open (filenamestr+".tpdat","a")
 744
 745                 flt = "%6.3f" % data
 746                 inter = self.decln
 747                 integ = self.integ
 748                 fc = self.observing
 749                 fc = fc / 1000000
 750                 bw = self.bw
 751                 bw = bw / 1000000
 752                 ga = self.gain
 753
 754                 now = time.time()
 755
 756                 #
 757                 # If time to write full header info (saves storage this way)
 758                 #
 759                 if (now - self.continuum_then > 20):
 760                         self.sun.compute(self.locality)
 761                         enow = ephem.now()
 762                         sun_insky = "Down"
 763                         self.sunstate = "Dn"
 764                         if ((self.sun.rise_time < enow) and (enow < self.sun.set_time)):
 765                            sun_insky = "Up"
 766                            self.sunstate = "Up"
 767                         self.continuum_then = now
 768
 769                         continuum_file.write(str(ephem.hours(sidtime))+" "+flt+" Dn="+str(inter)+",")
 770                         continuum_file.write("Ti="+str(integ)+",Fc="+str(fc)+",Bw="+str(bw))
 771                         continuum_file.write(",Ga="+str(ga)+",Sun="+str(sun_insky)+"\n")
 772                 else:
 773                         continuum_file.write(str(ephem.hours(sidtime))+" "+flt+"\n")
 774
 775                 continuum_file.close()
 776                 return(data)
 777
 778         def write_spectral_data(self,data,sidtime):
 779
 780                 now = time.time()
 781                 delta = 10
 782
 783                 # If time to write out spectral data
 784                 # We don't write this out every time, in order to
 785                 #       save disk space.  Since the spectral data are
 786                 #       typically heavily averaged, writing this data
 787                 #       "once in a while" is OK.
 788                 #
 789                 if (now - self.spectral_then >= delta):
 790                         self.spectral_then = now
 791
 792                         # Get localtime structure to make filename from
 793                         foo = time.localtime()
 794
 795                         pfx = self.prefix
 796                         filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
 797                            foo.tm_mon, foo.tm_mday, foo.tm_hour)
 798
 799                         # Open the file
 800                         spectral_file = open (filenamestr+".sdat","a")
 801
 802                         # Setup data fields to be written
 803                         r = data
 804                         inter = self.decln
 805                         fc = self.observing
 806                         fc = fc / 1000000
 807                         bw = self.bw
 808                         bw = bw / 1000000
 809                         av = self.avg_alpha
 810
 811                         # Write those fields
 812                         spectral_file.write("data:"+str(ephem.hours(sidtime))+" Dn="+str(inter)+",Fc="+str(fc)+",Bw="+str(bw)+",Av="+str(av))
 813                         spectral_file.write (" [ ")
 814                         for r in data:
 815                                 spectral_file.write(" "+str(r))
 816
 817                         spectral_file.write(" ]\n")
 818                         spectral_file.close()
 819                         return(data)
 820
 821                 return(data)
 822
 823         def seti_analysis(self,fftbuf,sidtime):
 824                 l = len(fftbuf)
 825                 x = 0
 826                 hits = []
 827                 hit_intensities = []
 828                 if self.seticounter < self.setitimer:
 829                         self.seticounter = self.seticounter + 1
 830                         return
 831                 else:
 832                         self.seticounter = 0
 833
 834                 # Run through FFT output buffer, computing standard deviation (Sigma)
 835                 avg = 0
 836                 # First compute average
 837                 for i in range(0,l):
 838                         avg = avg + fftbuf[i]
 839                 avg = avg / l
 840
 841                 sigma = 0.0
 842                 # Then compute standard deviation (Sigma)
 843                 for i in range(0,l):
 844                         d = fftbuf[i] - avg
 845                         sigma = sigma + (d*d)
 846
 847                 sigma = Numeric.sqrt(sigma/l)
 848
 849                 #
 850                 # Snarfle through the FFT output buffer again, looking for
 851                 #        outlying data points
 852
 853                 start_f = self.observing - (self.fft_input_rate/2)
 854                 current_f = start_f
 855                 l = len(fftbuf)
 856                 f_incr = self.fft_input_rate / l
 857                 hit = -1
 858
 859                 # -nyquist to DC
 860                 for i in range(l/2,l):
 861                         #
 862                         # If current FFT buffer has an item that exceeds the specified
 863                         #  sigma
 864                         #
 865                         if ((fftbuf[i] - avg) > (self.setik * sigma)):
 866                                 hits.append(current_f)
 867                                 hit_intensities.append(fftbuf[i])
 868                         current_f = current_f + f_incr
 869
 870                 # DC to nyquist
 871                 for i in range(0,l/2):
 872                         #
 873                         # If current FFT buffer has an item that exceeds the specified
 874                         #  sigma
 875                         #
 876                         if ((fftbuf[i] - avg) > (self.setik * sigma)):
 877                                 hits.append(current_f)
 878                                 hit_intensities.append(fftbuf[i])
 879                         current_f = current_f + f_incr
 880
 881                 # No hits
 882                 if (len(hits) <= 0):
 883                         return
 884
 885
 886                 #
 887                 # OK, so we have some hits in the FFT buffer
 888                 #       They'll have a rather substantial gauntlet to run before
 889                 #       being declared a real "hit"
 890                 #
 891
 892                 # Update stats
 893                 self.s1hitcounter = self.s1hitcounter + len(hits)
 894
 895                 # Weed out buffers with an excessive number of
 896                 #       signals above Sigma
 897                 if (len(hits) > self.nhits):
 898                         return
 899
 900
 901                 # Weed out FFT buffers with apparent multiple narrowband signals
 902                 #       separated significantly in frequency.  This means that a
 903                 #       single signal spanning multiple bins is OK, but a buffer that
 904                 #       has multiple, apparently-separate, signals isn't OK.
 905                 #
 906                 last = hits[0]
 907                 ns2 = 1
 908                 for i in range(1,len(hits)):
 909                         if ((hits[i] - last) > (f_incr*3.0)):
 910                                 return
 911                         last = hits[i]
 912                         ns2 = ns2 + 1
 913
 914                 self.s2hitcounter = self.s2hitcounter + ns2
 915
 916                 #
 917                 # Run through all available hit buffers, computing difference between
 918                 #       frequencies found there, if they're all within the chirp limits
 919                 #       declare a good hit
 920                 #
 921                 good_hit = False
 922                 f_ds = Numeric.zeros(self.nhitlines, Numeric.Float64)
 923                 avg_delta = 0
 924                 k = 0
 925                 for i in range(0,min(len(hits),len(self.hits_array[:,0]))):
 926                         f_ds[0] = abs(self.hits_array[i,0] - hits[i])
 927                         for j in range(1,len(f_ds)):
 928                            f_ds[j] = abs(self.hits_array[i,j] - self.hits_array[i,0])
 929                            avg_delta = avg_delta + f_ds[j]
 930                            k = k + 1
 931
 932                         if (self.seti_isahit (f_ds)):
 933                                 good_hit = True
 934                                 self.hitcounter = self.hitcounter + 1
 935                                 break
 936
 937                 if (avg_delta/k < (self.seti_fft_bandwidth/2)):
 938                         self.avgdelta = avg_delta / k
 939
 940                 # Save 'n shuffle hits
 941                 #  Old hit buffers percolate through the hit buffers
 942                 #  (there are self.nhitlines of these buffers)
 943                 #  and then drop off the end
 944                 #  A consequence is that while the nhitlines buffers are filling,
 945                 #  you can get some absurd values for self.avgdelta, because some
 946                 #  of the buffers are full of zeros
 947                 for i in range(self.nhitlines,1):
 948                         self.hits_array[:,i] = self.hits_array[:,i-1]
 949                         self.hit_intensities[:,i] = self.hit_intensities[:,i-1]
 950
 951                 for i in range(0,len(hits)):
 952                         self.hits_array[i,0] = hits[i]
 953                         self.hit_intensities[i,0] = hit_intensities[i]
 954
 955                 # Finally, write the hits/intensities buffer
 956                 if (good_hit):
 957                         self.write_hits(sidtime)
 958
 959                 return
 960
 961         def seti_isahit(self,fdiffs):
 962                 truecount = 0
 963
 964                 for i in range(0,len(fdiffs)):
 965                         if (fdiffs[i] >= self.CHIRP_LOWER and fdiffs[i] <= self.CHIRP_UPPER):
 966                                 truecount = truecount + 1
 967
 968                 if truecount == len(fdiffs):
 969                         return (True)
 970                 else:
 971                         return (False)
 972
 973         def write_hits(self,sidtime):
 974                 # Create localtime structure for producing filename
 975                 foo = time.localtime()
 976                 pfx = self.prefix
 977                 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
 978                    foo.tm_mon, foo.tm_mday, foo.tm_hour)
 979
 980                 # Open the data file, appending
 981                 hits_file = open (filenamestr+".seti","a")
 982
 983                 # Write sidtime first
 984                 hits_file.write(str(ephem.hours(sidtime))+" "+str(self.decln)+" ")
 985
 986                 #
 987                 # Then write the hits/hit intensities buffers with enough
 988                 #       "syntax" to allow parsing by external (not yet written!)
 989                 #       "stuff".
 990                 #
 991                 for i in range(0,self.nhitlines):
 992                         hits_file.write(" ")
 993                         for j in range(0,self.nhits):
 994                                 hits_file.write(str(self.hits_array[j,i])+":")
 995                                 hits_file.write(str(self.hit_intensities[j,i])+",")
 996                 hits_file.write("\n")
 997                 hits_file.close()
 998                 return
 999
1000         def xydfunc(self,xyv):
1001                 if self.setimode == True:
1002                         return
1003                 magn = int(Numeric.log10(self.observing))
1004                 if (magn == 6 or magn == 7 or magn == 8):
1005                         magn = 6
1006                 dfreq = xyv[0] * pow(10.0,magn)
1007                 ratio = self.observing / dfreq
1008                 vs = 1.0 - ratio
1009                 vs *= 299792.0
1010                 if magn >= 9:
1011                    xhz = "Ghz"
1012                 elif magn >= 6:
1013                    xhz = "Mhz"
1014                 elif magn <= 5:
1015                    xhz =  "Khz"
1016                 s = "%.6f%s\n%.3fdB" % (xyv[0], xhz, xyv[1])
1017                 s2 = "\n%.3fkm/s" % vs
1018                 self.myform['spec_data'].set_value(s+s2)
1019
1020         def xydfunc_waterfall(self,pos):
1021                 lower = self.observing - (self.seti_fft_bandwidth / 2)
1022                 upper = self.observing + (self.seti_fft_bandwidth / 2)
1023                 binwidth = self.seti_fft_bandwidth / 1024
1024                 s = "%.6fMHz" % ((lower + (pos.x*binwidth)) / 1.0e6)
1025                 self.myform['spec_data'].set_value(s)
1026
1027         def toggle_cal(self):
1028                 if (self.calstate == True):
1029                   self.calstate = False
1030                   self.u.write_io(0,0,(1<<15))
1031                   self.calibrator.SetLabel("Calibration Source: Off")
1032                 else:
1033                   self.calstate = True
1034                   self.u.write_io(0,(1<<15),(1<<15))
1035                   self.calibrator.SetLabel("Calibration Source: On")
1036
1037         def toggle_annotation(self):
1038                 if (self.annotate_state == True):
1039                   self.annotate_state = False
1040                   self.annotation.SetLabel("Annotation: Off")
1041                 else:
1042                   self.annotate_state = True
1043                   self.annotation.SetLabel("Annotation: On")
1044         #
1045         # Turn scanning on/off
1046         # Called-back by "Recording" button
1047         #
1048         def toggle_scanning(self):
1049                 # Current scanning?      Flip state
1050                 if (self.scanning == True):
1051                   self.scanning = False
1052                   self.scan_control.SetLabel("Scan: Off")
1053                 # Not scanning
1054                 else:
1055                   self.scanning = True
1056                   self.scan_control.SetLabel("Scan: On ")
1057
1058         def set_pd_offset(self,offs):
1059                  self.myform['offset'].set_value(offs)
1060                  self.calib_offset=offs
1061                  x = self.calib_coeff / 100.0
1062                  self.cal_offs.set_k(offs*(x*8000))
1063
1064         def set_pd_gain(self,gain):
1065                  self.myform['dcgain'].set_value(gain)
1066                  self.cal_mult.set_k(gain*0.01)
1067                  self.calib_coeff = gain
1068                  x = gain/100.0
1069                  self.cal_offs.set_k(self.calib_offset*(x*8000))
1070
1071         def compute_notch_taps(self,notchlist):
1072                  NOTCH_TAPS = 256
1073                  tmptaps = Numeric.zeros(NOTCH_TAPS,Numeric.Complex64)
1074                  binwidth = self.bw / NOTCH_TAPS
1075
1076                  for i in range(0,NOTCH_TAPS):
1077                          tmptaps[i] = complex(1.0,0.0)
1078
1079                  for i in notchlist:
1080                          diff = i - self.observing
1081                          if i == 0:
1082                                  break
1083                          if (diff > 0):
1084                                  idx = diff / binwidth
1085                                  idx = int(idx)
1086                                  if (idx < 0 or idx > (NOTCH_TAPS/2)):
1087                                          break
1088                                  tmptaps[idx] = complex(0.0, 0.0)
1089
1090                          if (diff < 0):
1091                                  idx = -diff / binwidth
1092                                  idx = (NOTCH_TAPS/2) - idx
1093                                  idx = int(idx+(NOTCH_TAPS/2))
1094                                  if (idx < 0 or idx > (NOTCH_TAPS)):
1095                                          break
1096                                  tmptaps[idx] = complex(0.0, 0.0)
1097
1098                  self.notch_taps = numpy.fft.ifft(tmptaps)
1099
1100         #
1101         # Setup common pieces of radiometer mode
1102         #
1103         def setup_radiometer_common(self):
1104                 # The IIR integration filter for post-detection
1105                 self.integrator = gr.single_pole_iir_filter_ff(1.0)
1106                 self.integrator.set_taps (1.0/self.bw)
1107
1108                 # Signal probe
1109                 self.probe = gr.probe_signal_f()
1110
1111                 #
1112                 # Continuum calibration stuff
1113                 #
1114                 x = self.calib_coeff/100.0
1115                 self.cal_mult = gr.multiply_const_ff(self.calib_coeff/100.0)
1116                 self.cal_offs = gr.add_const_ff(self.calib_offset*(x*8000))
1117
1118                 #
1119                 # Mega decimator after IIR filter
1120                 #
1121                 if (self.switch_mode == False):
1122                         self.keepn = gr.keep_one_in_n(gr.sizeof_float, self.bw)
1123                 else:
1124                         self.keepn = gr.keep_one_in_n(gr.sizeof_float, int(self.bw/2))
1125
1126                 #
1127                 # For the Dicke-switching scheme
1128                 #
1129                 self.switch = gr.multiply_const_ff(1.0)
1130
1131                 #
1132                 if (self.switch_mode == True):
1133                         self.vector = gr.vector_sink_f()
1134                         self.swkeep = gr.keep_one_in_n(gr.sizeof_float, int(self.bw/3))
1135                         self.mute = gr.keep_one_in_n(gr.sizeof_float, 1)
1136                         self.cmute = gr.keep_one_in_n(gr.sizeof_float, int(1.0e9))
1137                         self.cintegrator = gr.single_pole_iir_filter_ff(1.0/(self.bw/2))
1138                         self.cprobe = gr.probe_signal_f()
1139                 else:
1140                         self.mute = gr.multiply_const_ff(1.0)
1141
1142
1143                 self.avg_reference_value = 0.0
1144                 self.reference_level = gr.add_const_ff(0.0)
1145
1146         #
1147         # Setup ordinary single-channel radiometer mode
1148         #
1149         def setup_normal(self, setimode):
1150
1151                 self.head = self.u
1152                 self.shead = self.u
1153
1154                 if setimode == False:
1155                         self.detector = gr.complex_to_mag_squared()
1156                         self.setup_radiometer_common()
1157                         self.connect(self.shead, self.scope)
1158
1159                         self.connect(self.head, self.detector, self.mute, self.reference_level,
1160                                 self.integrator, self.keepn, self.cal_mult, self.cal_offs, self.chart)
1161
1162                         self.connect(self.cal_offs, self.probe)
1163
1164                         #
1165                         # Add a side-chain detector chain, with a different integrator, for sampling
1166                         #   The reference channel data
1167                         # This is used to derive the offset value for self.reference_level, used above
1168                         #
1169                         if (self.switch_mode == True):
1170                                 self.connect(self.detector, self.cmute, self.cintegrator, self.swkeep, self.cprobe)
1171
1172                 return
1173
1174         #
1175         # Setup dual-channel (two antenna, usual orthogonal polarity probes in the same waveguide)
1176         #
1177         def setup_dual(self, setimode):
1178
1179                 self.di = gr.deinterleave(gr.sizeof_gr_complex)
1180                 self.addchans = gr.add_cc ()
1181                 self.detector = gr.add_ff ()
1182                 self.h_power = gr.complex_to_mag_squared()
1183                 self.v_power = gr.complex_to_mag_squared()
1184                 self.connect (self.u, self.di)
1185
1186                 #
1187                 # For spectral, adding the two channels works, assuming no gross
1188                 #       phase or amplitude error
1189                 self.connect ((self.di, 0), (self.addchans, 0))
1190                 self.connect ((self.di, 1), (self.addchans, 1))
1191
1192                 #
1193                 # Connect heads of spectral and total-power chains
1194                 #
1195                 self.head = self.di
1196                 self.shead = self.addchans
1197
1198                 if (setimode == False):
1199
1200                         self.setup_radiometer_common()
1201
1202                         #
1203                         # For dual-polarization mode, we compute the sum of the
1204                         #       powers on each channel, after they've been detected
1205                         #
1206                         self.detector = gr.add_ff()
1207
1208                         #
1209                         # In dual-polarization mode, we compute things a little differently
1210                         # In effect, we have two radiometer chains, terminating in an adder
1211                         #
1212                         self.connect((self.di, 0), self.h_power)
1213                         self.connect((self.di, 1), self.v_power)
1214                         self.connect(self.h_power, (self.detector, 0))
1215                         self.connect(self.v_power, (self.detector, 1))
1216                         self.connect(self.detector, self.mute, self.reference_level,
1217                                 self.integrator, self.keepn, self.cal_mult, self.cal_offs, self.chart)
1218                         self.connect(self.cal_offs, self.probe)
1219                         self.connect(self.shead, self.scope)
1220
1221                         #
1222                         # Add a side-chain detector chain, with a different integrator, for sampling
1223                         #   The reference channel data
1224                         # This is used to derive the offset value for self.reference_level, used above
1225                         #
1226                         if (self.switch_mode == True):
1227                                 self.connect(self.detector, self.cmute, self.cintegrator, self.swkeep, self.cprobe)
1228                 return
1229
1230         #
1231         # Setup correlating interferometer mode
1232         #
1233         def setup_interferometer(self, setimode):
1234                 self.setup_radiometer_common()
1235
1236                 self.di = gr.deinterleave(gr.sizeof_gr_complex)
1237                 self.connect (self.u, self.di)
1238                 self.corr = gr.multiply_cc()
1239                 self.c2f = gr.complex_to_float()
1240
1241                 self.shead = (self.di, 0)
1242
1243                 # Channel 0 to multiply port 0
1244                 # Channel 1 to multiply port 1
1245                 self.connect((self.di, 0), (self.corr, 0))
1246                 self.connect((self.di, 1), (self.corr, 1))
1247
1248                 #
1249                 # Multiplier (correlator) to complex-to-float, followed by integrator, etc
1250                 #
1251                 self.connect(self.corr, self.c2f, self.switch, self.integrator, self.keepn, self.cal_mult, self.cal_offs, self.chart)
1252
1253                 #
1254                 # FFT scope gets only 1 channel
1255                 #  FIX THIS, by cross-correlating the *outputs* of two different FFTs, then display
1256                 #  Funky!
1257                 #
1258                 self.connect(self.shead, self.scope)
1259
1260                 #
1261                 # Output of correlator/integrator chain to probe
1262                 #
1263                 self.connect(self.cal_offs, self.probe)
1264
1265                 return
1266
1267         #
1268         # Setup SETI mode
1269         #
1270         def setup_seti(self):
1271                 self.connect (self.shead, self.fft_bandpass, self.scope)
1272                 return
1273
1274
1275
1276 def main ():
1277         app = stdgui2.stdapp(app_flow_graph, "RADIO ASTRONOMY SPECTRAL/CONTINUUM RECEIVER: $Revision$", nstatus=1)
1278         app.MainLoop()
1279
1280 if __name__ == '__main__':
1281         main ()