3 # Copyright 2004,2005 Free Software Foundation, Inc.
5 # This file is part of GNU Radio
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)
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.
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.
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 stdgui, ra_fftsink, ra_stripchartsink, ra_waterfallsink, form, slider
29 from optparse import OptionParser
37 class continuum_calibration(gr.feval_dd):
39 str = globals()["calibration_codelet"]
43 class app_flow_graph(stdgui.gui_flow_graph):
44 def __init__(self, frame, panel, vbox, argv):
45 stdgui.gui_flow_graph.__init__(self)
50 parser = OptionParser(option_class=eng_option)
51 parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0, 0),
52 help="select USRP Rx side A or B (default=A)")
53 parser.add_option("-d", "--decim", type="int", default=16,
54 help="set fgpa decimation rate to DECIM [default=%default]")
55 parser.add_option("-f", "--freq", type="eng_float", default=None,
56 help="set frequency to FREQ", metavar="FREQ")
57 parser.add_option("-a", "--avg", type="eng_float", default=1.0,
58 help="set spectral averaging alpha")
59 parser.add_option("-i", "--integ", type="eng_float", default=1.0,
60 help="set integration time")
61 parser.add_option("-g", "--gain", type="eng_float", default=None,
62 help="set gain in dB (default is midpoint)")
63 parser.add_option("-l", "--reflevel", type="eng_float", default=30.0,
64 help="Set Total power reference level")
65 parser.add_option("-y", "--division", type="eng_float", default=0.5,
66 help="Set Total power Y division size")
67 parser.add_option("-e", "--longitude", type="eng_float", default=-76.02, help="Set Observer Longitude")
68 parser.add_option("-c", "--latitude", type="eng_float", default=44.85, help="Set Observer Latitude")
69 parser.add_option("-o", "--observing", type="eng_float", default=0.0,
70 help="Set observing frequency")
71 parser.add_option("-x", "--ylabel", default="dB", help="Y axis label")
72 parser.add_option("-z", "--divbase", type="eng_float", default=0.025, help="Y Division increment base")
73 parser.add_option("-v", "--stripsize", type="eng_float", default=2400, help="Size of stripchart, in 2Hz samples")
74 parser.add_option("-F", "--fft_size", type="eng_float", default=1024, help="Size of FFT")
76 parser.add_option("-N", "--decln", type="eng_float", default=999.99, help="Observing declination")
77 parser.add_option("-X", "--prefix", default="./")
78 parser.add_option("-M", "--fft_rate", type="eng_float", default=8.0, help="FFT Rate")
79 parser.add_option("-A", "--calib_coeff", type="eng_float", default=1.0, help="Calibration coefficient")
80 parser.add_option("-B", "--calib_offset", type="eng_float", default=0.0, help="Calibration coefficient")
81 parser.add_option("-W", "--waterfall", action="store_true", default=False, help="Use Waterfall FFT display")
82 parser.add_option("-S", "--setimode", action="store_true", default=False, help="Enable SETI processing of spectral data")
83 parser.add_option("-K", "--setik", type="eng_float", default=1.5, help="K value for SETI analysis")
84 parser.add_option("-T", "--setibandwidth", type="eng_float", default=12500, help="Instantaneous SETI observing bandwidth--must be divisor of 250Khz")
85 (options, args) = parser.parse_args()
90 self.show_debug_info = True
92 # Pick up waterfall option
93 self.waterfall = options.waterfall
96 self.setimode = options.setimode
98 self.setik = options.setik
99 # Because we force the input rate to be 250Khz, 12.5Khz is
100 # exactly 1/20th of this, which makes building decimators
102 # This also allows larger FFTs to be used without totally-gobbling
103 # CPU. With an FFT size of 16384, for example, this bandwidth
104 # yields a binwidth of 0.762Hz, and plenty of CPU left over
105 # for other things, like the SETI analysis code.
107 self.seti_fft_bandwidth = int(options.setibandwidth)
110 binwidth = self.seti_fft_bandwidth / options.fft_size
112 # Use binwidth, and knowledge of likely chirp rates to set reasonable
113 # values for SETI analysis code. We assume that SETI signals will
114 # chirp at somewhere between 0.10Hz/sec and 0.25Hz/sec.
116 # upper_limit is the "worst case"--that is, the case for which we have
117 # wait the longest to actually see any drift, due to the quantizing
119 upper_limit = binwidth / 0.10
120 self.setitimer = int(upper_limit * 2.00)
123 # Calculate the CHIRP values based on Hz/sec
124 self.CHIRP_LOWER = 0.10 * self.setitimer
125 self.CHIRP_UPPER = 0.25 * self.setitimer
127 # Reset hit counter to 0
129 # We scan through 1Mhz of bandwidth around the chosen center freq
130 self.seti_freq_range = 1.0e6
131 # Calculate lower edge
132 self.setifreq_lower = options.freq - (self.seti_freq_range/2)
133 self.setifreq_current = options.freq
134 # Calculate upper edge
135 self.setifreq_upper = options.freq + (self.seti_freq_range/2)
137 # We change center frequencies every 10 self.setitimer intervals
138 self.setifreq_timer = self.setitimer * 10
140 # Create actual timer
141 self.seti_then = time.time()
143 # The hits recording array
146 self.hits_array = Numeric.zeros((self.nhits,self.nhitlines), Numeric.Float64)
147 self.hit_intensities = Numeric.zeros((self.nhits,self.nhitlines), Numeric.Float64)
148 # Calibration coefficient and offset
149 self.calib_coeff = options.calib_coeff
150 self.calib_offset = options.calib_offset
152 self.integ = options.integ
153 self.avg_alpha = options.avg
154 self.gain = options.gain
155 self.decln = options.decln
157 # Set initial values for datalogging timed-output
158 self.continuum_then = time.time()
159 self.spectral_then = time.time()
164 # If SETI mode, we always run at maximum USRP decimation
169 self.u = usrp.source_c(decim_rate=options.decim)
170 self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
171 # Set initial declination
172 self.decln = options.decln
174 # determine the daughterboard subdevice we're using
175 self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
176 self.cardtype = self.subdev.dbid()
178 input_rate = self.u.adc_freq() / self.u.decim_rate()
181 # Set prefix for data files
183 self.prefix = options.prefix
186 # The lower this number, the fewer sample frames are dropped
187 # in computing the FFT. A sampled approach is taken to
188 # computing the FFT of the incoming data, which reduces
189 # sensitivity. Increasing sensitivity inreases CPU loading.
191 self.fft_rate = options.fft_rate
193 self.fft_size = int(options.fft_size)
195 # This buffer is used to remember the most-recent FFT display
196 # values. Used later by self.write_spectral_data() to write
197 # spectral data to datalogging files, and by the SETI analysis
200 self.fft_outbuf = Numeric.zeros(self.fft_size, Numeric.Float64)
203 # If SETI mode, only look at seti_fft_bandwidth (currently 12.5Khz)
207 self.fft_input_rate = self.seti_fft_bandwidth
210 # Build a decimating bandpass filter
212 self.fft_input_taps = gr.firdes.complex_band_pass (1.0,
214 -(int(self.fft_input_rate/2)), int(self.fft_input_rate/2), 200,
215 gr.firdes.WIN_HAMMING, 0)
218 # Compute required decimation factor
220 decimation = int(input_rate/self.fft_input_rate)
221 self.fft_bandpass = gr.fir_filter_ccc (decimation,
224 self.fft_input_rate = input_rate
227 if self.waterfall == False:
228 self.scope = ra_fftsink.ra_fft_sink_c (self, panel,
229 fft_size=int(self.fft_size), sample_rate=self.fft_input_rate,
230 fft_rate=int(self.fft_rate), title="Spectral",
231 ofunc=self.fft_outfunc, xydfunc=self.xydfunc)
233 self.scope = ra_waterfallsink.ra_waterfallsink_c (self, panel,
234 fft_size=int(self.fft_size), sample_rate=self.fft_input_rate,
235 fft_rate=int(self.fft_rate), title="Spectral", ofunc=self.fft_outfunc, xydfunc=self.xydfunc_waterfall)
237 # Set up ephemeris data
238 self.locality = ephem.Observer()
239 self.locality.long = str(options.longitude)
240 self.locality.lat = str(options.latitude)
241 # We make notes about Sunset/Sunrise in Continuum log files
242 self.sun = ephem.Sun()
245 # Set up stripchart display
246 self.stripsize = int(options.stripsize)
247 if self.setimode == False:
248 self.chart = ra_stripchartsink.stripchart_sink_f (self, panel,
249 stripsize=self.stripsize,
251 xlabel="LMST Offset (Seconds)",
252 scaling=1.0, ylabel=options.ylabel,
253 divbase=options.divbase)
255 # Set center frequency
256 self.centerfreq = options.freq
258 # Set observing frequency (might be different from actual programmed
260 if options.observing == 0.0:
261 self.observing = options.freq
263 self.observing = options.observing
267 # We setup the first two integrators to produce a fixed integration
268 # Down to 1Hz, with output at 1 samples/sec
271 # Second stage runs on decimated output of first
274 # Create taps for first integrator
280 # Create taps for second integrator
287 # The 3rd integrator is variable, and user selectable at runtime
288 # This integrator doesn't decimate, but is used to set the
289 # final integration time based on the constant 1Hz input samples
290 # The strip chart is fed at a constant 1Hz rate as a result
294 # Call constructors for receive chains
297 if self.setimode == False:
298 # The three integrators--two FIR filters, and an IIR final filter
299 self.integrator1 = gr.fir_filter_fff (N, tapsN)
300 self.integrator2 = gr.fir_filter_fff (M, tapsM)
301 self.integrator3 = gr.single_pole_iir_filter_ff(1.0)
304 self.detector = gr.complex_to_mag_squared()
306 # Split complex USRP stream into a pair of floats
307 #self.splitter = gr.complex_to_float (1);
309 # # I squarer (detector)
310 # self.multI = gr.multiply_ff();
312 # # Q squarer (detector)
313 # self.multQ = gr.multiply_ff();
315 # # Adding squared I and Q to produce instantaneous signal power
316 # self.adder = gr.add_ff();
319 self.probe = gr.probe_signal_f();
322 # Continuum calibration stuff
324 self.cal_mult = gr.multiply_const_ff(self.calib_coeff);
325 self.cal_offs = gr.add_const_ff(self.calib_offset);
328 # Start connecting configured modules in the receive chain
331 # The scope--handle SETI mode
332 if (self.setimode == False):
333 self.connect(self.u, self.scope)
335 self.connect(self.u, self.fft_bandpass, self.scope)
337 if self.setimode == False:
339 # # The head of the continuum chain
341 # self.connect(self.u, self.splitter)
343 # # Connect splitter outputs to multipliers
345 # self.connect((self.splitter, 0), (self.multI,0))
346 # self.connect((self.splitter, 0), (self.multI,1))
349 # self.connect((self.splitter, 1), (self.multQ,0))
350 # self.connect((self.splitter, 1), (self.multQ,1))
352 # # Then sum the squares
353 # self.connect(self.multI, (self.adder,0))
354 # self.connect(self.multQ, (self.adder,1))
356 # # Connect adder output to two-stages of FIR integrator
357 # # followed by a single stage IIR integrator, and
359 # self.connect(self.adder, self.integrator1,
360 # self.integrator2, self.integrator3, self.cal_mult,
361 # self.cal_offs, self.chart)
363 self.connect(self.u, self.detector,
364 self.integrator1, self.integrator2,
365 self.integrator3, self.cal_mult, self.cal_offs, self.chart)
367 # Connect calibrator to probe
368 # SPECIAL NOTE: I'm setting the ground work here
369 # for completely changing the way local_calibrator
370 # works, including removing some horrible kludges for
372 # But for now, self.probe() will be used to display the
373 # current instantaneous integrated detector value
374 self.connect(self.cal_offs, self.probe)
376 self._build_gui(vbox)
378 # Make GUI agree with command-line
379 self.integ = options.integ
380 if self.setimode == False:
381 self.myform['integration'].set_value(int(options.integ))
382 self.myform['average'].set_value(int(options.avg))
384 if self.setimode == False:
385 # Make integrator agree with command line
386 self.set_integration(int(options.integ))
388 self.avg_alpha = options.avg
390 # Make spectral averager agree with command line
391 if options.avg != 1.0:
392 self.scope.set_avg_alpha(float(1.0/options.avg))
393 self.scope.set_average(True)
395 if self.setimode == False:
397 self.chart.set_y_per_div(options.division)
398 # Set reference(MAX) level
399 self.chart.set_ref_level(options.reflevel)
403 if options.gain is None:
404 # if no gain was specified, use the mid-point in dB
405 g = self.subdev.gain_range()
406 options.gain = float(g[0]+g[1])/2
408 if options.freq is None:
409 # if no freq was specified, use the mid-point
410 r = self.subdev.freq_range()
411 options.freq = float(r[0]+r[1])/2
413 # Set the initial gain control
414 self.set_gain(options.gain)
416 if not(self.set_freq(options.freq)):
417 self._set_status_msg("Failed to set initial frequency")
420 self.set_decln (self.decln)
423 # RF hardware information
424 self.myform['decim'].set_value(self.u.decim_rate())
425 self.myform['fs@usb'].set_value(self.u.adc_freq() / self.u.decim_rate())
426 self.myform['dbname'].set_value(self.subdev.name())
428 # Set analog baseband filtering, if DBS_RX
429 if self.cardtype in (usrp_dbid.DBS_RX, usrp_dbid.DBS_RX_REV_2_1):
430 lbw = (self.u.adc_freq() / self.u.decim_rate()) / 2
433 self.subdev.set_bw(lbw)
435 # Start the timer for the LMST display and datalogging
436 self.lmst_timer.Start(1000)
439 def _set_status_msg(self, msg):
440 self.frame.GetStatusBar().SetStatusText(msg, 0)
442 def _build_gui(self, vbox):
444 def _form_set_freq(kv):
445 # Adjust current SETI frequency, and limits
446 self.setifreq_lower = kv['freq'] - (self.seti_freq_range/2)
447 self.setifreq_current = kv['freq']
448 self.setifreq_upper = kv['freq'] + (self.seti_freq_range/2)
450 # Reset SETI analysis timer
451 self.seti_then = time.time()
452 # Zero-out hits array when changing frequency
453 self.hits_array[:,:] = 0.0
454 self.hit_intensities[:,:] = -60.0
456 return self.set_freq(kv['freq'])
458 def _form_set_decln(kv):
459 return self.set_decln(kv['decln'])
461 # Position the FFT display
462 vbox.Add(self.scope.win, 15, wx.EXPAND)
464 if self.setimode == False:
465 # Position the Total-power stripchart
466 vbox.Add(self.chart.win, 15, wx.EXPAND)
468 # add control area at the bottom
469 self.myform = myform = form.form()
470 hbox = wx.BoxSizer(wx.HORIZONTAL)
471 hbox.Add((7,0), 0, wx.EXPAND)
472 vbox1 = wx.BoxSizer(wx.VERTICAL)
473 myform['freq'] = form.float_field(
474 parent=self.panel, sizer=vbox1, label="Center freq", weight=1,
475 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
477 vbox1.Add((4,0), 0, 0)
479 myform['lmst_high'] = form.static_text_field(
480 parent=self.panel, sizer=vbox1, label="Current LMST", weight=1)
481 vbox1.Add((4,0), 0, 0)
483 myform['spec_data'] = form.static_text_field(
484 parent=self.panel, sizer=vbox1, label="Spectral Cursor", weight=1)
485 vbox1.Add((4,0), 0, 0)
487 vbox2 = wx.BoxSizer(wx.VERTICAL)
488 g = self.subdev.gain_range()
489 myform['gain'] = form.slider_field(parent=self.panel, sizer=vbox2, label="RF Gain",
491 min=int(g[0]), max=int(g[1]),
492 callback=self.set_gain)
494 vbox2.Add((4,0), 0, 0)
495 myform['average'] = form.slider_field(parent=self.panel, sizer=vbox2,
496 label="Spectral Averaging (FFT frames)", weight=1, min=1, max=3000, callback=self.set_averaging)
498 # Set up scan control button when in SETI mode
499 if (self.setimode == True):
500 # SETI scanning control
501 buttonbox = wx.BoxSizer(wx.HORIZONTAL)
502 self.scan_control = form.button_with_callback(self.panel,
504 callback=self.toggle_scanning)
506 buttonbox.Add(self.scan_control, 0, wx.CENTER)
507 vbox2.Add(buttonbox, 0, wx.CENTER)
508 vbox2.Add((4,0), 0, 0)
510 if self.setimode == False:
511 myform['integration'] = form.slider_field(parent=self.panel, sizer=vbox2,
512 label="Continuum Integration Time (sec)", weight=1, min=1, max=180, callback=self.set_integration)
514 vbox2.Add((4,0), 0, 0)
516 myform['decln'] = form.float_field(
517 parent=self.panel, sizer=vbox2, label="Current Declination", weight=1,
518 callback=myform.check_input_and_call(_form_set_decln))
519 vbox2.Add((4,0), 0, 0)
521 buttonbox = wx.BoxSizer(wx.HORIZONTAL)
522 vbox.Add(buttonbox, 0, wx.CENTER)
523 hbox.Add(vbox1, 0, 0)
524 hbox.Add(vbox2, wx.ALIGN_RIGHT, 0)
525 vbox.Add(hbox, 0, wx.EXPAND)
527 self._build_subpanel(vbox)
529 self.lmst_timer = wx.PyTimer(self.lmst_timeout)
533 def _build_subpanel(self, vbox_arg):
534 # build a secondary information panel (sometimes hidden)
536 # FIXME figure out how to have this be a subpanel that is always
537 # created, but has its visibility controlled by foo.Show(True/False)
539 if not(self.show_debug_info):
546 #panel = wx.Panel(self.panel, -1)
547 #vbox = wx.BoxSizer(wx.VERTICAL)
549 hbox = wx.BoxSizer(wx.HORIZONTAL)
551 myform['decim'] = form.static_float_field(
552 parent=panel, sizer=hbox, label="Decim")
555 myform['fs@usb'] = form.static_float_field(
556 parent=panel, sizer=hbox, label="Fs@USB")
559 myform['dbname'] = form.static_text_field(
560 parent=panel, sizer=hbox)
563 myform['baseband'] = form.static_float_field(
564 parent=panel, sizer=hbox, label="Analog BB")
567 myform['ddc'] = form.static_float_field(
568 parent=panel, sizer=hbox, label="DDC")
571 vbox.Add(hbox, 0, wx.EXPAND)
575 def set_freq(self, target_freq):
577 Set the center frequency we're interested in.
579 @param target_freq: frequency in Hz
582 Tuning is a two step process. First we ask the front-end to
583 tune as close to the desired frequency as it can. Then we use
584 the result of that operation and our target_frequency to
585 determine the value for the digital down converter.
588 # Everything except BASIC_RX should support usrp.tune()
590 if not (self.cardtype == usrp_dbid.BASIC_RX):
591 r = usrp.tune(self.u, 0, self.subdev, target_freq)
593 r = self.u.set_rx_freq(0, target_freq)
594 f = self.u.rx_freq(0)
595 if abs(f-target_freq) > 2.0e3:
598 self.myform['freq'].set_value(target_freq) # update displayed value
600 # Make sure calibrator knows our target freq
603 # Remember centerfreq---used for doppler calcs
604 delta = self.centerfreq - target_freq
605 self.centerfreq = target_freq
606 self.observing -= delta
607 self.scope.set_baseband_freq (self.observing)
609 self.myform['baseband'].set_value(r.baseband_freq)
610 self.myform['ddc'].set_value(r.dxc_freq)
616 def set_decln(self, dec):
618 self.myform['decln'].set_value(dec) # update displayed value
620 def set_gain(self, gain):
621 self.myform['gain'].set_value(gain) # update displayed value
622 self.subdev.set_gain(gain)
625 def set_averaging(self, avval):
626 self.myform['average'].set_value(avval)
627 self.scope.set_avg_alpha(1.0/(avval))
628 self.scope.set_average(True)
629 self.avg_alpha = avval
631 def set_integration(self, integval):
632 if self.setimode == False:
633 self.integrator3.set_taps(1.0/integval)
634 self.myform['integration'].set_value(integval)
635 self.integ = integval
639 # Used to update LMST display, as well as current
642 # We also write external data-logging files here
644 def lmst_timeout(self):
645 self.locality.date = ephem.now()
646 if self.setimode == False:
647 x = self.probe.level()
648 sidtime = self.locality.sidereal_time()
650 s = str(ephem.hours(sidtime)) + " " + self.sunstate
651 # Continuum detector value
652 if self.setimode == False:
654 s = s + "\nDet: " + str(sx)
656 sx = "%2d" % self.hitcounter
657 sy = "%3.1f-%3.1f" % (self.CHIRP_LOWER, self.CHIRP_UPPER)
658 s = s + "\nHits: " + str(sx) + "\nCh lim: " + str(sy)
659 self.myform['lmst_high'].set_value(s)
662 # Write data out to recording files
664 if self.setimode == False:
665 self.write_continuum_data(x,sidtime)
666 self.write_spectral_data(self.fft_outbuf,sidtime)
669 self.seti_analysis(self.fft_outbuf,sidtime)
671 if ((self.scanning == True) and ((now - self.seti_then) > self.setifreq_timer)):
673 self.setifreq_current = self.setifreq_current + self.fft_input_rate
674 if (self.setifreq_current > self.setifreq_upper):
675 self.setifreq_current = self.setifreq_lower
676 self.set_freq(self.setifreq_current)
677 # Make sure we zero-out the hits array when changing
679 self.hits_array[:,:] = 0.0
680 self.hit_intensities[:,:] = 0.0
682 def fft_outfunc(self,data,l):
685 def write_continuum_data(self,data,sidtime):
687 # Create localtime structure for producing filename
688 foo = time.localtime()
690 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
691 foo.tm_mon, foo.tm_mday, foo.tm_hour)
693 # Open the data file, appending
694 continuum_file = open (filenamestr+".tpdat","a")
708 # If time to write full header info (saves storage this way)
710 if (now - self.continuum_then > 20):
711 self.sun.compute(self.locality)
715 if ((self.sun.rise_time < enow) and (enow < self.sun.set_time)):
718 self.continuum_then = now
720 continuum_file.write(str(ephem.hours(sidtime))+" "+flt+" Dn="+str(inter)+",")
721 continuum_file.write("Ti="+str(integ)+",Fc="+str(fc)+",Bw="+str(bw))
722 continuum_file.write(",Ga="+str(ga)+",Sun="+str(sun_insky)+"\n")
724 continuum_file.write(str(ephem.hours(sidtime))+" "+flt+"\n")
726 continuum_file.close()
729 def write_spectral_data(self,data,sidtime):
734 # If time to write out spectral data
735 # We don't write this out every time, in order to
736 # save disk space. Since the spectral data are
737 # typically heavily averaged, writing this data
738 # "once in a while" is OK.
740 if (now - self.spectral_then >= delta):
741 self.spectral_then = now
743 # Get localtime structure to make filename from
744 foo = time.localtime()
747 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
748 foo.tm_mon, foo.tm_mday, foo.tm_hour)
751 spectral_file = open (filenamestr+".sdat","a")
753 # Setup data fields to be written
763 spectral_file.write("data:"+str(ephem.hours(sidtime))+" Dn="+str(inter)+",Fc="+str(fc)+",Bw="+str(bw)+",Av="+str(av))
764 spectral_file.write(" "+str(r)+"\n")
765 spectral_file.close()
770 def seti_analysis(self,fftbuf,sidtime):
775 if self.seticounter < self.setitimer:
776 self.seticounter = self.seticounter + 1
781 # Run through FFT output buffer, computing standard deviation (Sigma)
783 # First compute average
785 avg = avg + fftbuf[i]
789 # Then compute standard deviation (Sigma)
792 sigma = sigma + (d*d)
794 sigma = Numeric.sqrt(sigma/l)
797 # Snarfle through the FFT output buffer again, looking for
798 # outlying data points
800 start_f = self.observing - (self.fft_input_rate/2)
802 f_incr = self.fft_input_rate / l
807 for i in range(l/2,l):
809 # If current FFT buffer has an item that exceeds the specified
812 if ((fftbuf[i] - avg) > (self.setik * sigma)):
813 hits.append(current_f)
814 hit_intensities.append(fftbuf[i])
815 current_f = current_f + f_incr
818 for i in range(0,l/2):
820 # If current FFT buffer has an item that exceeds the specified
823 if ((fftbuf[i] - avg) > (self.setik * sigma)):
824 hits.append(current_f)
825 hit_intensities.append(fftbuf[i])
826 current_f = current_f + f_incr
833 # OK, so we have some hits in the FFT buffer
834 # They'll have a rather substantial gauntlet to run before
835 # being declared a real "hit"
838 # Weed out buffers with an excessive number of strong signals
839 if (len(hits) > self.nhits):
842 # Weed out FFT buffers with apparent multiple narrowband signals
843 # separated significantly in frequency. This means that a
844 # single signal spanning multiple bins is OK, but a buffer that
845 # has multiple, apparently-separate, signals isn't OK.
848 for i in range(1,len(hits)):
849 if ((hits[i] - last) > (f_incr*2.0)):
854 # Run through all three hit buffers, computing difference between
855 # frequencies found there, if they're all within the chirp limits
860 for i in range(0,min(len(hits),len(self.hits_array[:,0]))):
861 f_d1 = abs(self.hits_array[i,0] - hits[i])
862 f_d2 = abs(self.hits_array[i,1] - self.hits_array[i,0])
863 f_d3 = abs(self.hits_array[i,2] - self.hits_array[i,1])
864 if (self.seti_isahit ([f_d1, f_d2, f_d3])):
866 self.hitcounter = self.hitcounter + 1
870 # Save 'n shuffle hits
871 for i in range(self.nhitlines,1):
872 self.hits_array[:,i] = self.hits_array[:,i-1]
873 self.hit_intensities[:,i] = self.hit_intensities[:,i-1]
875 for i in range(0,len(hits)):
876 self.hits_array[i,0] = hits[i]
877 self.hit_intensities[i,0] = hit_intensities[i]
879 # Finally, write the hits/intensities buffer
881 self.write_hits(sidtime)
885 def seti_isahit(self,fdiffs):
888 for i in range(0,len(fdiffs)):
889 if (fdiffs[i] >= self.CHIRP_LOWER and fdiffs[i] <= self.CHIRP_UPPER):
890 truecount = truecount + 1
892 if truecount == len(fdiffs):
897 def write_hits(self,sidtime):
898 # Create localtime structure for producing filename
899 foo = time.localtime()
901 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
902 foo.tm_mon, foo.tm_mday, foo.tm_hour)
904 # Open the data file, appending
905 hits_file = open (filenamestr+".seti","a")
907 # Write sidtime first
908 hits_file.write(str(ephem.hours(sidtime))+" "+str(self.decln)+" ")
911 # Then write the hits/hit intensities buffers with enough
912 # "syntax" to allow parsing by external (not yet written!)
915 for i in range(0,self.nhitlines):
917 for j in range(0,self.nhits):
918 hits_file.write(str(self.hits_array[j,i])+":")
919 hits_file.write(str(self.hit_intensities[j,i])+",")
920 hits_file.write("\n")
924 def xydfunc(self,xyv):
925 magn = int(Numeric.log10(self.observing))
926 if (magn == 6 or magn == 7 or magn == 8):
928 dfreq = xyv[0] * pow(10.0,magn)
929 ratio = self.observing / dfreq
938 s = "%.6f%s\n%.3fdB" % (xyv[0], xhz, xyv[1])
939 s2 = "\n%.3fkm/s" % vs
940 self.myform['spec_data'].set_value(s+s2)
942 def xydfunc_waterfall(self,pos):
943 lower = self.observing - (self.seti_fft_bandwidth / 2)
944 upper = self.observing + (self.seti_fft_bandwidth / 2)
945 binwidth = self.seti_fft_bandwidth / 1024
946 s = "%.6fMHz" % ((lower + (pos.x*binwidth)) / 1.0e6)
947 self.myform['spec_data'].set_value(s)
949 def toggle_cal(self):
950 if (self.calstate == True):
951 self.calstate = False
952 self.u.write_io(0,0,(1<<15))
953 self.calibrator.SetLabel("Calibration Source: Off")
956 self.u.write_io(0,(1<<15),(1<<15))
957 self.calibrator.SetLabel("Calibration Source: On")
959 def toggle_annotation(self):
960 if (self.annotate_state == True):
961 self.annotate_state = False
962 self.annotation.SetLabel("Annotation: Off")
964 self.annotate_state = True
965 self.annotation.SetLabel("Annotation: On")
967 # Turn scanning on/off
968 # Called-back by "Recording" button
970 def toggle_scanning(self):
971 # Current scanning? Flip state
972 if (self.scanning == True):
973 self.scanning = False
974 self.scan_control.SetLabel("Scan: Off")
978 self.scan_control.SetLabel("Scan: On ")
981 app = stdgui.stdapp(app_flow_graph, "RADIO ASTRONOMY SPECTRAL/CONTINUUM RECEIVER: $Revision$", nstatus=1)
984 if __name__ == '__main__':