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 2, 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)
122 # Calculate the CHIRP values based on Hz/sec
123 self.CHIRP_LOWER = 0.10 * self.setitimer
124 self.CHIRP_UPPER = 0.25 * self.setitimer
126 # Reset hit counter to 0
128 # We scan through 1Mhz of bandwidth around the chosen center freq
129 self.seti_freq_range = 1.0e6
130 # Calculate lower edge
131 self.setifreq_lower = options.freq - (self.seti_freq_range/2)
132 self.setifreq_current = options.freq
133 # Calculate upper edge
134 self.setifreq_upper = options.freq + (self.seti_freq_range/2)
136 # We change center frequencies every 10 self.setitimer intervals
137 self.setifreq_timer = self.setitimer * 10
139 # Create actual timer
140 self.seti_then = time.time()
142 # The hits recording array
145 self.hits_array = Numeric.zeros((self.nhits,self.nhitlines), Numeric.Float64)
146 self.hit_intensities = Numeric.zeros((self.nhits,self.nhitlines), Numeric.Float64)
147 # Calibration coefficient and offset
148 self.calib_coeff = options.calib_coeff
149 self.calib_offset = options.calib_offset
151 self.integ = options.integ
152 self.avg_alpha = options.avg
153 self.gain = options.gain
154 self.decln = options.decln
156 # Set initial values for datalogging timed-output
157 self.continuum_then = time.time()
158 self.spectral_then = time.time()
163 # If SETI mode, we always run at maximum USRP decimation
168 self.u = usrp.source_c(decim_rate=options.decim)
169 self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
170 self.cardtype = self.u.daughterboard_id(0)
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)
177 input_rate = self.u.adc_freq() / self.u.decim_rate()
180 # Set prefix for data files
182 self.prefix = options.prefix
185 # The lower this number, the fewer sample frames are dropped
186 # in computing the FFT. A sampled approach is taken to
187 # computing the FFT of the incoming data, which reduces
188 # sensitivity. Increasing sensitivity inreases CPU loading.
190 self.fft_rate = options.fft_rate
192 self.fft_size = options.fft_size
194 # This buffer is used to remember the most-recent FFT display
195 # values. Used later by self.write_spectral_data() to write
196 # spectral data to datalogging files, and by the SETI analysis
199 self.fft_outbuf = Numeric.zeros(options.fft_size, Numeric.Float64)
202 # If SETI mode, only look at seti_fft_bandwidth (currently 12.5Khz)
206 self.fft_input_rate = self.seti_fft_bandwidth
209 # Build a decimating bandpass filter
211 self.fft_input_taps = gr.firdes.complex_band_pass (1.0,
213 -(int(self.fft_input_rate/2)), int(self.fft_input_rate/2), 200,
214 gr.firdes.WIN_HAMMING, 0)
217 # Compute required decimation factor
219 decimation = int(input_rate/self.fft_input_rate)
220 self.fft_bandpass = gr.fir_filter_ccc (decimation,
223 self.fft_input_rate = input_rate
226 if self.waterfall == False:
227 self.scope = ra_fftsink.ra_fft_sink_c (self, panel,
228 fft_size=int(self.fft_size), sample_rate=self.fft_input_rate,
229 fft_rate=int(self.fft_rate), title="Spectral",
230 ofunc=self.fft_outfunc, xydfunc=self.xydfunc)
232 self.scope = ra_waterfallsink.ra_waterfallsink_c (self, panel,
233 fft_size=int(self.fft_size), sample_rate=self.fft_input_rate,
234 fft_rate=int(self.fft_rate), title="Spectral", ofunc=self.fft_outfunc, xydfunc=self.xydfunc_waterfall)
236 # Set up ephemeris data
237 self.locality = ephem.Observer()
238 self.locality.long = str(options.longitude)
239 self.locality.lat = str(options.latitude)
240 # We make notes about Sunset/Sunrise in Continuum log files
241 self.sun = ephem.Sun()
244 # Set up stripchart display
245 self.stripsize = int(options.stripsize)
246 if self.setimode == False:
247 self.chart = ra_stripchartsink.stripchart_sink_f (self, panel,
248 stripsize=self.stripsize,
250 xlabel="LMST Offset (Seconds)",
251 scaling=1.0, ylabel=options.ylabel,
252 divbase=options.divbase)
254 # Set center frequency
255 self.centerfreq = options.freq
257 # Set observing frequency (might be different from actual programmed
259 if options.observing == 0.0:
260 self.observing = options.freq
262 self.observing = options.observing
266 # We setup the first two integrators to produce a fixed integration
267 # Down to 1Hz, with output at 1 samples/sec
270 # Second stage runs on decimated output of first
273 # Create taps for first integrator
279 # Create taps for second integrator
286 # The 3rd integrator is variable, and user selectable at runtime
287 # This integrator doesn't decimate, but is used to set the
288 # final integration time based on the constant 1Hz input samples
289 # The strip chart is fed at a constant 1Hz rate as a result
293 # Call constructors for receive chains
296 if self.setimode == False:
297 # The three integrators--two FIR filters, and an IIR final filter
298 self.integrator1 = gr.fir_filter_fff (N, tapsN)
299 self.integrator2 = gr.fir_filter_fff (M, tapsM)
300 self.integrator3 = gr.single_pole_iir_filter_ff(1.0)
302 # Split complex USRP stream into a pair of floats
303 self.splitter = gr.complex_to_float (1);
305 # I squarer (detector)
306 self.multI = gr.multiply_ff();
308 # Q squarer (detector)
309 self.multQ = gr.multiply_ff();
311 # Adding squared I and Q to produce instantaneous signal power
312 self.adder = gr.add_ff();
315 self.probe = gr.probe_signal_f();
318 # Continuum calibration stuff
320 self.cal_mult = gr.multiply_const_ff(self.calib_coeff);
321 self.cal_offs = gr.add_const_ff(self.calib_offset);
324 # Start connecting configured modules in the receive chain
327 # The scope--handle SETI mode
328 if (self.setimode == False):
329 self.connect(self.u, self.scope)
331 self.connect(self.u, self.fft_bandpass, self.scope)
333 if self.setimode == False:
335 # The head of the continuum chain
337 self.connect(self.u, self.splitter)
339 # Connect splitter outputs to multipliers
341 self.connect((self.splitter, 0), (self.multI,0))
342 self.connect((self.splitter, 0), (self.multI,1))
345 self.connect((self.splitter, 1), (self.multQ,0))
346 self.connect((self.splitter, 1), (self.multQ,1))
348 # Then sum the squares
349 self.connect(self.multI, (self.adder,0))
350 self.connect(self.multQ, (self.adder,1))
352 # Connect adder output to two-stages of FIR integrator
353 # followed by a single stage IIR integrator, and
355 self.connect(self.adder, self.integrator1,
356 self.integrator2, self.integrator3, self.cal_mult,
357 self.cal_offs, self.chart)
359 # Connect calibrator to probe
360 # SPECIAL NOTE: I'm setting the ground work here
361 # for completely changing the way local_calibrator
362 # works, including removing some horrible kludges for
364 # But for now, self.probe() will be used to display the
365 # current instantaneous integrated detector value
366 self.connect(self.cal_offs, self.probe)
368 self._build_gui(vbox)
370 # Make GUI agree with command-line
371 self.integ = options.integ
372 if self.setimode == False:
373 self.myform['integration'].set_value(int(options.integ))
374 self.myform['average'].set_value(int(options.avg))
376 if self.setimode == False:
377 # Make integrator agree with command line
378 self.set_integration(int(options.integ))
380 self.avg_alpha = options.avg
382 # Make spectral averager agree with command line
383 if options.avg != 1.0:
384 self.scope.set_avg_alpha(float(1.0/options.avg))
385 self.scope.set_average(True)
387 if self.setimode == False:
389 self.chart.set_y_per_div(options.division)
390 # Set reference(MAX) level
391 self.chart.set_ref_level(options.reflevel)
395 if options.gain is None:
396 # if no gain was specified, use the mid-point in dB
397 g = self.subdev.gain_range()
398 options.gain = float(g[0]+g[1])/2
400 if options.freq is None:
401 # if no freq was specified, use the mid-point
402 r = self.subdev.freq_range()
403 options.freq = float(r[0]+r[1])/2
405 # Set the initial gain control
406 self.set_gain(options.gain)
408 if not(self.set_freq(options.freq)):
409 self._set_status_msg("Failed to set initial frequency")
412 self.set_decln (self.decln)
415 # RF hardware information
416 self.myform['decim'].set_value(self.u.decim_rate())
417 self.myform['fs@usb'].set_value(self.u.adc_freq() / self.u.decim_rate())
418 self.myform['dbname'].set_value(self.subdev.name())
420 # Set analog baseband filtering, if DBS_RX
421 if self.cardtype == usrp_dbid.DBS_RX:
422 lbw = (self.u.adc_freq() / self.u.decim_rate()) / 2
425 self.subdev.set_bw(lbw)
427 # Start the timer for the LMST display and datalogging
428 self.lmst_timer.Start(1000)
431 def _set_status_msg(self, msg):
432 self.frame.GetStatusBar().SetStatusText(msg, 0)
434 def _build_gui(self, vbox):
436 def _form_set_freq(kv):
437 # Adjust current SETI frequency, and limits
438 self.setifreq_lower = kv['freq'] - (self.seti_freq_range/2)
439 self.setifreq_current = kv['freq']
440 self.setifreq_upper = kv['freq'] + (self.seti_freq_range/2)
442 # Reset SETI analysis timer
443 self.seti_then = time.time()
444 # Zero-out hits array when changing frequency
445 self.hits_array[:,:] = 0.0
446 self.hit_intensities[:,:] = -60.0
448 return self.set_freq(kv['freq'])
450 def _form_set_decln(kv):
451 return self.set_decln(kv['decln'])
453 # Position the FFT display
454 vbox.Add(self.scope.win, 15, wx.EXPAND)
456 if self.setimode == False:
457 # Position the Total-power stripchart
458 vbox.Add(self.chart.win, 15, wx.EXPAND)
460 # add control area at the bottom
461 self.myform = myform = form.form()
462 hbox = wx.BoxSizer(wx.HORIZONTAL)
463 hbox.Add((7,0), 0, wx.EXPAND)
464 vbox1 = wx.BoxSizer(wx.VERTICAL)
465 myform['freq'] = form.float_field(
466 parent=self.panel, sizer=vbox1, label="Center freq", weight=1,
467 callback=myform.check_input_and_call(_form_set_freq, self._set_status_msg))
469 vbox1.Add((4,0), 0, 0)
471 myform['lmst_high'] = form.static_text_field(
472 parent=self.panel, sizer=vbox1, label="Current LMST", weight=1)
473 vbox1.Add((4,0), 0, 0)
475 myform['spec_data'] = form.static_text_field(
476 parent=self.panel, sizer=vbox1, label="Spectral Cursor", weight=1)
477 vbox1.Add((4,0), 0, 0)
479 vbox2 = wx.BoxSizer(wx.VERTICAL)
480 g = self.subdev.gain_range()
481 myform['gain'] = form.slider_field(parent=self.panel, sizer=vbox2, label="RF Gain",
483 min=int(g[0]), max=int(g[1]),
484 callback=self.set_gain)
486 vbox2.Add((4,0), 0, 0)
487 myform['average'] = form.slider_field(parent=self.panel, sizer=vbox2,
488 label="Spectral Averaging (FFT frames)", weight=1, min=1, max=2000, callback=self.set_averaging)
490 vbox2.Add((4,0), 0, 0)
492 if self.setimode == False:
493 myform['integration'] = form.slider_field(parent=self.panel, sizer=vbox2,
494 label="Continuum Integration Time (sec)", weight=1, min=1, max=180, callback=self.set_integration)
496 vbox2.Add((4,0), 0, 0)
498 myform['decln'] = form.float_field(
499 parent=self.panel, sizer=vbox2, label="Current Declination", weight=1,
500 callback=myform.check_input_and_call(_form_set_decln))
501 vbox2.Add((4,0), 0, 0)
503 buttonbox = wx.BoxSizer(wx.HORIZONTAL)
504 vbox.Add(buttonbox, 0, wx.CENTER)
505 hbox.Add(vbox1, 0, 0)
506 hbox.Add(vbox2, wx.ALIGN_RIGHT, 0)
507 vbox.Add(hbox, 0, wx.EXPAND)
509 self._build_subpanel(vbox)
511 self.lmst_timer = wx.PyTimer(self.lmst_timeout)
515 def _build_subpanel(self, vbox_arg):
516 # build a secondary information panel (sometimes hidden)
518 # FIXME figure out how to have this be a subpanel that is always
519 # created, but has its visibility controlled by foo.Show(True/False)
521 if not(self.show_debug_info):
528 #panel = wx.Panel(self.panel, -1)
529 #vbox = wx.BoxSizer(wx.VERTICAL)
531 hbox = wx.BoxSizer(wx.HORIZONTAL)
533 myform['decim'] = form.static_float_field(
534 parent=panel, sizer=hbox, label="Decim")
537 myform['fs@usb'] = form.static_float_field(
538 parent=panel, sizer=hbox, label="Fs@USB")
541 myform['dbname'] = form.static_text_field(
542 parent=panel, sizer=hbox)
545 myform['baseband'] = form.static_float_field(
546 parent=panel, sizer=hbox, label="Analog BB")
549 myform['ddc'] = form.static_float_field(
550 parent=panel, sizer=hbox, label="DDC")
553 vbox.Add(hbox, 0, wx.EXPAND)
557 def set_freq(self, target_freq):
559 Set the center frequency we're interested in.
561 @param target_freq: frequency in Hz
564 Tuning is a two step process. First we ask the front-end to
565 tune as close to the desired frequency as it can. Then we use
566 the result of that operation and our target_frequency to
567 determine the value for the digital down converter.
570 # Everything except BASIC_RX should support usrp.tune()
572 if not (self.cardtype == usrp_dbid.BASIC_RX):
573 r = usrp.tune(self.u, 0, self.subdev, target_freq)
575 r = self.u.set_rx_freq(0, target_freq)
576 f = self.u.rx_freq(0)
577 if abs(f-target_freq) > 2.0e3:
580 self.myform['freq'].set_value(target_freq) # update displayed value
582 # Make sure calibrator knows our target freq
585 # Remember centerfreq---used for doppler calcs
586 delta = self.centerfreq - target_freq
587 self.centerfreq = target_freq
588 self.observing -= delta
589 self.scope.set_baseband_freq (self.observing)
591 self.myform['baseband'].set_value(r.baseband_freq)
592 self.myform['ddc'].set_value(r.dxc_freq)
598 def set_decln(self, dec):
600 self.myform['decln'].set_value(dec) # update displayed value
602 def set_gain(self, gain):
603 self.myform['gain'].set_value(gain) # update displayed value
604 self.subdev.set_gain(gain)
607 def set_averaging(self, avval):
608 self.myform['average'].set_value(avval)
609 self.scope.set_avg_alpha(1.0/(avval))
610 self.scope.set_average(True)
611 self.avg_alpha = avval
613 def set_integration(self, integval):
614 if self.setimode == False:
615 self.integrator3.set_taps(1.0/integval)
616 self.myform['integration'].set_value(integval)
617 self.integ = integval
621 # Used to update LMST display, as well as current
624 # We also write external data-logging files here
626 def lmst_timeout(self):
627 self.locality.date = ephem.now()
628 if self.setimode == False:
629 x = self.probe.level()
630 sidtime = self.locality.sidereal_time()
632 s = str(ephem.hours(sidtime)) + " " + self.sunstate
633 # Continuum detector value
634 if self.setimode == False:
636 s = s + "\nDet: " + str(sx)
638 sx = "%2d" % self.hitcounter
639 sy = "%3.1f-%3.1f" % (self.CHIRP_LOWER, self.CHIRP_UPPER)
640 s = s + "\nHits: " + str(sx) + "\nCh lim: " + str(sy)
641 self.myform['lmst_high'].set_value(s)
644 # Write data out to recording files
646 if self.setimode == False:
647 self.write_continuum_data(x,sidtime)
648 self.write_spectral_data(self.fft_outbuf,sidtime)
651 self.seti_analysis(self.fft_outbuf,sidtime)
653 if ((now - self.seti_then) > self.setifreq_timer):
655 self.setifreq_current = self.setifreq_current + self.fft_input_rate
656 if (self.setifreq_current > self.setifreq_upper):
657 self.setifreq_current = self.setifreq_lower
658 self.set_freq(self.setifreq_current)
659 # Make sure we zero-out the hits array when changing
661 self.hits_array[:,:] = 0.0
662 self.hit_intensities[:,:] = 0.0
664 def fft_outfunc(self,data,l):
667 def write_continuum_data(self,data,sidtime):
669 # Create localtime structure for producing filename
670 foo = time.localtime()
672 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
673 foo.tm_mon, foo.tm_mday, foo.tm_hour)
675 # Open the data file, appending
676 continuum_file = open (filenamestr+".tpdat","a")
690 # If time to write full header info (saves storage this way)
692 if (now - self.continuum_then > 20):
693 self.sun.compute(self.locality)
697 if ((self.sun.rise_time < enow) and (enow < self.sun.set_time)):
700 self.continuum_then = now
702 continuum_file.write(str(ephem.hours(sidtime))+" "+flt+" Dn="+str(inter)+",")
703 continuum_file.write("Ti="+str(integ)+",Fc="+str(fc)+",Bw="+str(bw))
704 continuum_file.write(",Ga="+str(ga)+",Sun="+str(sun_insky)+"\n")
706 continuum_file.write(str(ephem.hours(sidtime))+" "+flt+"\n")
708 continuum_file.close()
711 def write_spectral_data(self,data,sidtime):
716 # If time to write out spectral data
717 # We don't write this out every time, in order to
718 # save disk space. Since the spectral data are
719 # typically heavily averaged, writing this data
720 # "once in a while" is OK.
722 if (now - self.spectral_then >= delta):
723 self.spectral_then = now
725 # Get localtime structure to make filename from
726 foo = time.localtime()
729 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
730 foo.tm_mon, foo.tm_mday, foo.tm_hour)
733 spectral_file = open (filenamestr+".sdat","a")
735 # Setup data fields to be written
745 spectral_file.write("data:"+str(ephem.hours(sidtime))+" Dn="+str(inter)+",Fc="+str(fc)+",Bw="+str(bw)+",Av="+str(av))
746 spectral_file.write(" "+str(r)+"\n")
747 spectral_file.close()
752 def seti_analysis(self,fftbuf,sidtime):
757 if self.seticounter < self.setitimer:
758 self.seticounter = self.seticounter + 1
763 # Run through FFT output buffer, computing standard deviation (Sigma)
765 # First compute average
767 avg = avg + fftbuf[i]
771 # Then compute standard deviation (Sigma)
774 sigma = sigma + (d*d)
776 sigma = Numeric.sqrt(sigma/l)
779 # Snarfle through the FFT output buffer again, looking for
780 # outlying data points
782 start_f = self.observing - (self.fft_input_rate/2)
784 f_incr = self.fft_input_rate / l
789 for i in range(l/2,l):
791 # If current FFT buffer has an item that exceeds the specified
794 if ((fftbuf[i] - avg) > (self.setik * sigma)):
795 hits.append(current_f)
796 hit_intensities.append(fftbuf[i])
797 current_f = current_f + f_incr
800 for i in range(0,l/2):
802 # If current FFT buffer has an item that exceeds the specified
805 if ((fftbuf[i] - avg) > (self.setik * sigma)):
806 hits.append(current_f)
807 hit_intensities.append(fftbuf[i])
808 current_f = current_f + f_incr
815 # OK, so we have some hits in the FFT buffer
816 # They'll have a rather substantial gauntlet to run before
817 # being declared a real "hit"
820 # Weed out buffers with an excessive number of strong signals
821 if (len(hits) > self.nhits):
824 # Weed out FFT buffers with apparent multiple narrowband signals
825 # separated significantly in frequency. This means that a
826 # single signal spanning multiple bins is OK, but a buffer that
827 # has multiple, apparently-separate, signals isn't OK.
830 for i in range(1,len(hits)):
831 if ((hits[i] - last) > (f_incr*2.0)):
836 # Run through all three hit buffers, computing difference between
837 # frequencies found there, if they're all within the chirp limits
842 for i in range(0,min(len(hits),len(self.hits_array[:,0]))):
843 f_d1 = abs(self.hits_array[i,0] - hits[i])
844 f_d2 = abs(self.hits_array[i,1] - self.hits_array[i,0])
845 f_d3 = abs(self.hits_array[i,2] - self.hits_array[i,1])
846 if (self.seti_isahit ([f_d1, f_d2, f_d3])):
848 self.hitcounter = self.hitcounter + 1
852 # Save 'n shuffle hits
853 for i in range(self.nhitlines,1):
854 self.hits_array[:,i] = self.hits_array[:,i-1]
855 self.hit_intensities[:,i] = self.hit_intensities[:,i-1]
857 for i in range(0,len(hits)):
858 self.hits_array[i,0] = hits[i]
859 self.hit_intensities[i,0] = hit_intensities[i]
861 # Finally, write the hits/intensities buffer
863 self.write_hits(sidtime)
867 def seti_isahit(self,fdiffs):
870 for i in range(0,len(fdiffs)):
871 if (fdiffs[i] >= self.CHIRP_LOWER and fdiffs[i] <= self.CHIRP_UPPER):
872 truecount = truecount + 1
874 if truecount == len(fdiffs):
879 def write_hits(self,sidtime):
880 # Create localtime structure for producing filename
881 foo = time.localtime()
883 filenamestr = "%s/%04d%02d%02d%02d" % (pfx, foo.tm_year,
884 foo.tm_mon, foo.tm_mday, foo.tm_hour)
886 # Open the data file, appending
887 hits_file = open (filenamestr+".seti","a")
889 # Write sidtime first
890 hits_file.write(str(ephem.hours(sidtime))+" "+str(self.decln)+" ")
893 # Then write the hits/hit intensities buffers with enough
894 # "syntax" to allow parsing by external (not yet written!)
897 for i in range(0,self.nhitlines):
899 for j in range(0,self.nhits):
900 hits_file.write(str(self.hits_array[j,i])+":")
901 hits_file.write(str(self.hit_intensities[j,i])+",")
902 hits_file.write("\n")
906 def xydfunc(self,xyv):
907 magn = int(Numeric.log10(self.observing))
908 if (magn == 6 or magn == 7 or magn == 8):
910 dfreq = xyv[0] * pow(10.0,magn)
911 ratio = self.observing / dfreq
920 s = "%.6f%s\n%.3fdB" % (xyv[0], xhz, xyv[1])
921 s2 = "\n%.3fkm/s" % vs
922 self.myform['spec_data'].set_value(s+s2)
924 def xydfunc_waterfall(self,pos):
925 lower = self.observing - (self.seti_fft_bandwidth / 2)
926 upper = self.observing + (self.seti_fft_bandwidth / 2)
927 binwidth = self.seti_fft_bandwidth / 1024
928 s = "%.6fMHz" % ((lower + (pos.x*binwidth)) / 1.0e6)
929 self.myform['spec_data'].set_value(s)
931 def toggle_cal(self):
932 if (self.calstate == True):
933 self.calstate = False
934 self.u.write_io(0,0,(1<<15))
935 self.calibrator.SetLabel("Calibration Source: Off")
938 self.u.write_io(0,(1<<15),(1<<15))
939 self.calibrator.SetLabel("Calibration Source: On")
941 def toggle_annotation(self):
942 if (self.annotate_state == True):
943 self.annotate_state = False
944 self.annotation.SetLabel("Annotation: Off")
946 self.annotate_state = True
947 self.annotation.SetLabel("Annotation: On")
951 app = stdgui.stdapp(app_flow_graph, "RADIO ASTRONOMY SPECTRAL/CONTINUUM RECEIVER: $Revision$", nstatus=1)
954 if __name__ == '__main__':