def test_101_interp(self):
taps = [1, 10, 100, 1000, 10000]
src_data = (0, 2, 3, 5, 7, 11, 13, 17)
interpolation = 3
xr = (0,0,0,0,2,20,200,2003,20030,300,3005,30050,500,5007,50070,700,7011,70110,1100,11013,110130,1300,13017,130170,1700.0,17000.0,170000.0)
expected_result = tuple([float(x) for x in xr])
src = gr.vector_source_f(src_data)
op = blks.rational_resampler_fff(self.fg, interpolation, 1, taps=taps)
dst = gr.vector_sink_f()
self.fg.connect(src, op)
self.fg.connect(op, dst)
self.fg.run()
result_data = dst.data()
self.assertEqual(expected_result, result_data)
def main():
parser = OptionParser(option_class=eng_option)
parser.add_option("-f",
"--freq",
type="eng_float",
default=144.800e6,
help="set frequency to FREQ",
metavar="FREQ")
parser.add_option("-m",
"--message",
type="string",
default=":ALL :this is a test",
help="message to send",
metavar="MESSAGE")
parser.add_option("-c",
"--mycall",
type="string",
default="MYCALL",
help="source callsign",
metavar="CALL")
parser.add_option("-t",
"--tocall",
type="string",
default="CQ",
help="recipient callsign",
metavar="CALL")
parser.add_option("-v",
"--via",
type="string",
default="RELAY",
help="digipeater callsign",
metavar="CALL")
parser.add_option("-d",
"--do-logging",
action="store_true",
default=False,
help="enable logging on datafiles")
parser.add_option("-s",
"--use-datafile",
action="store_true",
default=False,
help="use usrp.dat (256kbps) as output")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
bitrate = 9600
dac_rate = 128e6
usrp_interp = 500
cordic_freq = options.freq - dac_rate
sf = 153600
syminterp = sf / bitrate #16
nbfmdev = 3e3
fmsens = 2 * pi * nbfmdev / (sf * 5 / 3)
bit_oversampling = 8
sw_interp = int(sf / bitrate / bit_oversampling) #2
fg = gr.flow_graph()
p = buildpacket(options.mycall, 0, options.tocall, 0, options.via, 0, 0x03,
0xf0, options.message)
if options.do_logging:
dumppackettofile(p, "packet.dat")
v = bits2syms(nrziencode(scrambler(hdlcpacket(p, 100, 1000))))
src = gr.vector_source_f(v)
gaussian_taps = gr.firdes.gaussian(
1, # gain
bit_oversampling, # symbol_rate
0.3, # bandwidth * symbol time
4 * bit_oversampling # number of taps
)
sqwave = (1, ) * syminterp #rectangular window
taps = Numeric.convolve(Numeric.array(gaussian_taps),
Numeric.array(sqwave))
gaussian = gr.interp_fir_filter_fff(syminterp, taps) #9600*16=153600
res_taps = blks.design_filter(5, 3, 0.4)
res = blks.rational_resampler_fff(fg, 5, 3, res_taps) #153600*5/3=256000
fmmod = gr.frequency_modulator_fc(fmsens)
amp = gr.multiply_const_cc(32000)
if options.use_datafile:
dst = gr.file_sink(gr.sizeof_gr_complex, "usrp.dat")
else:
u = usrp.sink_c(0, usrp_interp) #256000*500=128000000
tx_subdev_spec = usrp.pick_tx_subdevice(u)
m = usrp.determine_tx_mux_value(u, tx_subdev_spec)
print "mux = %#04x" % (m, )
u.set_mux(m)
subdev = usrp.selected_subdev(u, tx_subdev_spec)
print "Using TX d'board %s" % (subdev.side_and_name(), )
u.set_tx_freq(0, cordic_freq)
u.set_pga(0, 0)
print "Actual frequency: ", u.tx_freq(0)
dst = u
fg.connect(src, gaussian, res, fmmod, amp, dst)
fg.start()
fg.wait()
def __init__(self, frame, panel, vbox, argv):
stdgui.gui_flow_graph.__init__(self)
self.frame = frame
self.panel = panel
parser = OptionParser(option_class=eng_option)
parser.add_option("-R", "--rx-subdev-spec", type="subdev", default=(0, 0),
help="select USRP Rx side A or B (default=A)")
parser.add_option("-d", "--decim", type="int", default=16,
help="set fgpa decimation rate to DECIM [default=%default]")
parser.add_option("-f", "--freq", type="eng_float", default=None,
help="set frequency to FREQ", metavar="FREQ")
parser.add_option("-Q", "--observing", type="eng_float", default=0.0,
help="set observing frequency to FREQ")
parser.add_option("-a", "--avg", type="eng_float", default=1.0,
help="set spectral averaging alpha")
parser.add_option("-V", "--favg", type="eng_float", default=2.0,
help="set folder averaging alpha")
parser.add_option("-g", "--gain", type="eng_float", default=None,
help="set gain in dB (default is midpoint)")
parser.add_option("-l", "--reflevel", type="eng_float", default=30.0,
help="Set pulse display reference level")
parser.add_option("-L", "--lowest", type="eng_float", default=1.5,
help="Lowest valid frequency bin")
parser.add_option("-e", "--longitude", type="eng_float", default=-76.02, help="Set Observer Longitude")
parser.add_option("-c", "--latitude", type="eng_float", default=44.85, help="Set Observer Latitude")
parser.add_option("-F", "--fft_size", type="eng_float", default=1024, help="Size of FFT")
parser.add_option ("-t", "--threshold", type="eng_float", default=2.5, help="pulsar threshold")
parser.add_option("-p", "--lowpass", type="eng_float", default=100, help="Pulse spectra cutoff freq")
parser.add_option("-P", "--prefix", default="./", help="File prefix")
parser.add_option("-u", "--pulsefreq", type="eng_float", default=0.748, help="Observation pulse rate")
parser.add_option("-D", "--dm", type="eng_float", default=1.0e-5, help="Dispersion Measure")
parser.add_option("-O", "--doppler", type="eng_float", default=1.0, help="Doppler ratio")
parser.add_option("-B", "--divbase", type="eng_float", default=20, help="Y/Div menu base")
parser.add_option("-I", "--division", type="eng_float", default=100, help="Y/Div")
parser.add_option("-A", "--audio_source", default="plughw:0,0", help="Audio input device spec")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
self.show_debug_info = True
self.reflevel = options.reflevel
self.divbase = options.divbase
self.division = options.division
self.audiodev = options.audio_source
# Low-pass cutoff for post-detector filter
# Set to 100Hz usually, since lots of pulsars fit in this
# range
self.lowpass = options.lowpass
# What is lowest valid frequency bin in post-detector FFT?
# There's some pollution very close to DC
self.lowest_freq = options.lowest
# What (dB) threshold to use in determining spectral candidates
self.threshold = options.threshold
# Filename prefix for recording file
self.prefix = options.prefix
# Dispersion Measure (DM)
self.dm = options.dm
# Doppler shift, as a ratio
# 1.0 == no doppler shift
# 1.005 == a little negative shift
# 0.995 == a little positive shift
self.doppler = options.doppler
#
# Input frequency and observing frequency--not necessarily the
# same thing, if we're looking at the IF of some downconverter
# that's ahead of the USRP and daughtercard. This distinction
# is important in computing the correct de-dispersion filter.
#
self.frequency = options.freq
if options.observing <= 0:
self.observing_freq = options.freq
else:
self.observing_freq = options.observing
# build the graph
self.u = usrp.source_c(decim_rate=options.decim)
self.u.set_mux(usrp.determine_rx_mux_value(self.u, options.rx_subdev_spec))
#
# Recording file, in case we ever need to record baseband data
#
self.recording = gr.file_sink(gr.sizeof_char, "/dev/null")
self.recording_state = False
self.pulse_recording = gr.file_sink(gr.sizeof_short, "/dev/null")
self.pulse_recording_state = False
#
# We come up with recording turned off, but the user may
# request recording later on
self.recording.close()
self.pulse_recording.close()
#
# Need these two for converting 12-bit baseband signals to 8-bit
#
self.tofloat = gr.complex_to_float()
self.tochar = gr.float_to_char()
# Need this for recording pulses (post-detector)
self.toshort = gr.float_to_short()
#
# The spectral measurer sets this when it has a valid
# average spectral peak-to-peak distance
# We can then use this to program the parameters for the epoch folder
#
# We set a sentimental value here
self.pulse_freq = options.pulsefreq
# Folder runs at this raw sample rate
self.folder_input_rate = 20000
# Each pulse in the epoch folder is sampled at 128 times the nominal
# pulse rate
self.folding = 128
#
# Try to find candidate parameters for rational resampler
#
save_i = 0
candidates = []
for i in range(20,300):
input_rate = self.folder_input_rate
output_rate = int(self.pulse_freq * i)
interp = gru.lcm(input_rate, output_rate) / input_rate
decim = gru.lcm(input_rate, output_rate) / output_rate
if (interp < 500 and decim < 250000):
candidates.append(i)
# We didn't find anything, bail!
if (len(candidates) < 1):
print "Couldn't converge on resampler parameters"
sys.exit(1)
#
# Now try to find candidate with the least sampling error
#
mindiff = 999.999
for i in candidates:
diff = self.pulse_freq * i
diff = diff - int(diff)
if (diff < mindiff):
mindiff = diff
save_i = i
# Recompute rates
input_rate = self.folder_input_rate
output_rate = int(self.pulse_freq * save_i)
# Compute new interp and decim, based on best candidate
interp = gru.lcm(input_rate, output_rate) / input_rate
decim = gru.lcm(input_rate, output_rate) / output_rate
# Save optimized folding parameters, used later
self.folding = save_i
self.interp = int(interp)
self.decim = int(decim)
# So that we can view 4 pulses in the pulse viewer window
FOLD_MULT=1
# determine the daughterboard subdevice we're using
self.subdev = usrp.selected_subdev(self.u, options.rx_subdev_spec)
self.cardtype = self.u.daughterboard_id(0)
# Compute raw input rate
input_rate = self.u.adc_freq() / self.u.decim_rate()
# BW==input_rate for complex data
self.bw = input_rate
#
# Set baseband filter bandwidth if DBS_RX:
#
if self.cardtype == usrp_dbid.DBS_RX:
lbw = input_rate / 2
if lbw < 1.0e6:
lbw = 1.0e6
self.subdev.set_bw(lbw)
#
# We use this as a crude volume control for the audio output
#
self.volume = gr.multiply_const_ff(10**(-1))
#
# Create location data for ephem package
#
self.locality = ephem.Observer()
self.locality.long = str(options.longitude)
self.locality.lat = str(options.latitude)
#
# What is the post-detector LPF cutoff for the FFT?
#
PULSAR_MAX_FREQ=int(options.lowpass)
# First low-pass filters down to input_rate/FIRST_FACTOR
# and decimates appropriately
FIRST_FACTOR=int(input_rate/(self.folder_input_rate/2))
first_filter = gr.firdes.low_pass (1.0,
input_rate,
input_rate/FIRST_FACTOR,
input_rate/(FIRST_FACTOR*20),
gr.firdes.WIN_HAMMING)
# Second filter runs at the output rate of the first filter,
# And low-pass filters down to PULSAR_MAX_FREQ*10
#
second_input_rate = int(input_rate/(FIRST_FACTOR/2))
second_filter = gr.firdes.band_pass(1.0, second_input_rate,
0.10,
PULSAR_MAX_FREQ*10,
PULSAR_MAX_FREQ*1.5,
gr.firdes.WIN_HAMMING)
# Third filter runs at PULSAR_MAX_FREQ*20
# and filters down to PULSAR_MAX_FREQ
#
third_input_rate = PULSAR_MAX_FREQ*20
third_filter = gr.firdes_band_pass(1.0, third_input_rate,
0.10, PULSAR_MAX_FREQ,
PULSAR_MAX_FREQ/10.0,
gr.firdes.WIN_HAMMING)
#
# Create the appropriate FFT scope
#
self.scope = ra_fftsink.ra_fft_sink_f (self, panel,
fft_size=int(options.fft_size), sample_rate=PULSAR_MAX_FREQ*2,
title="Post-detector spectrum",
ofunc=self.pulsarfunc, xydfunc=self.xydfunc, fft_rate=200)
#
# Tell scope we're looking from DC to PULSAR_MAX_FREQ
#
self.scope.set_baseband_freq (0.0)
#
# Setup stripchart for showing pulse profiles
#
hz = "%5.3fHz " % self.pulse_freq
per = "(%5.3f sec)" % (1.0/self.pulse_freq)
sr = "%d sps" % (int(self.pulse_freq*self.folding))
self.chart = ra_stripchartsink.stripchart_sink_f (self, panel,
sample_rate=1,
stripsize=self.folding*FOLD_MULT, parallel=True, title="Pulse Profiles: "+hz+per,
xlabel="Seconds @ "+sr, ylabel="Level", autoscale=True,
divbase=self.divbase, scaling=1.0/(self.folding*self.pulse_freq))
self.chart.set_ref_level(self.reflevel)
self.chart.set_y_per_div(self.division)
# De-dispersion filter setup
#
# Do this here, just before creating the filter
# that will use the taps.
#
ntaps = self.compute_disp_ntaps(self.dm,self.bw,self.observing_freq)
# Taps for the de-dispersion filter
self.disp_taps = Numeric.zeros(ntaps,Numeric.Complex64)
# Compute the de-dispersion filter now
self.compute_dispfilter(self.dm,self.doppler,
self.bw,self.observing_freq)
#
# Call constructors for receive chains
#
#
# Now create the FFT filter using the computed taps
self.dispfilt = gr.fft_filter_ccc(1, self.disp_taps)
#
# Audio sink
#
self.audio = audio.sink(second_input_rate, self.audiodev)
#
# The three post-detector filters
# Done this way to allow an audio path (up to 10Khz)
# ...and also because going from xMhz down to ~100Hz
# In a single filter doesn't seem to work.
#
self.first = gr.fir_filter_fff (FIRST_FACTOR/2, first_filter)
p = second_input_rate / (PULSAR_MAX_FREQ*20)
self.second = gr.fir_filter_fff (int(p), second_filter)
self.third = gr.fir_filter_fff (10, third_filter)
# Detector
self.detector = gr.complex_to_mag_squared()
self.enable_comb_filter = False
# Epoch folder comb filter
if self.enable_comb_filter == True:
bogtaps = Numeric.zeros(512, Numeric.Float64)
self.folder_comb = gr.fft_filter_ccc(1,bogtaps)
# Rational resampler
self.folder_rr = blks.rational_resampler_fff(self, self.interp, self.decim)
# Epoch folder bandpass
bogtaps = Numeric.zeros(1, Numeric.Float64)
self.folder_bandpass = gr.fir_filter_fff (1, bogtaps)
# Epoch folder F2C/C2F
self.folder_f2c = gr.float_to_complex()
self.folder_c2f = gr.complex_to_float()
# Epoch folder S2P
self.folder_s2p = gr.serial_to_parallel (gr.sizeof_float,
self.folding*FOLD_MULT)
# Epoch folder IIR Filter (produces average pulse profiles)
self.folder_iir = gr.single_pole_iir_filter_ff(1.0/options.favg,
self.folding*FOLD_MULT)
#
# Set all the epoch-folder goop up
#
self.set_folding_params()
#
# Start connecting configured modules in the receive chain
#
# Connect raw USRP to de-dispersion filter, detector
self.connect(self.u, self.dispfilt, self.detector)
# Connect detector output to FIR LPF
# in two stages, followed by the FFT scope
self.connect(self.detector, self.first,
self.second, self.third, self.scope)
# Connect audio output
self.connect(self.first, self.volume)
self.connect(self.volume, (self.audio, 0))
self.connect(self.volume, (self.audio, 1))
# Connect epoch folder
if self.enable_comb_filter == True:
self.connect (self.first, self.folder_bandpass, self.folder_rr,
self.folder_f2c,
self.folder_comb, self.folder_c2f,
self.folder_s2p, self.folder_iir,
self.chart)
else:
self.connect (self.first, self.folder_bandpass, self.folder_rr,
self.folder_s2p, self.folder_iir, self.chart)
# Connect baseband recording file (initially /dev/null)
self.connect(self.u, self.tofloat, self.tochar, self.recording)
# Connect pulse recording file (initially /dev/null)
self.connect(self.first, self.toshort, self.pulse_recording)
#
# Build the GUI elements
#
self._build_gui(vbox)
# Make GUI agree with command-line
self.myform['average'].set_value(int(options.avg))
self.myform['foldavg'].set_value(int(options.favg))
# Make spectral averager agree with command line
if options.avg != 1.0:
self.scope.set_avg_alpha(float(1.0/options.avg))
self.scope.set_average(True)
# set initial values
if options.gain is None:
# if no gain was specified, use the mid-point in dB
g = self.subdev.gain_range()
options.gain = float(g[0]+g[1])/2
if options.freq is None:
# if no freq was specified, use the mid-point
r = self.subdev.freq_range()
options.freq = float(r[0]+r[1])/2
self.set_gain(options.gain)
self.set_volume(-10.0)
if not(self.set_freq(options.freq)):
self._set_status_msg("Failed to set initial frequency")
self.myform['decim'].set_value(self.u.decim_rate())
self.myform['fs@usb'].set_value(self.u.adc_freq() / self.u.decim_rate())
self.myform['dbname'].set_value(self.subdev.name())
self.myform['DM'].set_value(self.dm)
self.myform['Doppler'].set_value(self.doppler)
#
# Start the timer that shows current LMST on the GUI
#
self.lmst_timer.Start(1000)
def main():
parser = OptionParser(option_class=eng_option)
parser.add_option("-R",
"--rx-subdev-spec",
type="subdev",
default=None,
help="select USRP Rx side A or B (default=A)")
parser.add_option("-f",
"--freq",
type="eng_float",
default=144.800e6,
help="set frequency to FREQ",
metavar="FREQ")
parser.add_option("-g",
"--gain",
type="eng_float",
default=None,
help="set gain in dB (default is midpoint)")
parser.add_option("-d",
"--do-logging",
action="store_true",
default=False,
help="enable logging on datafiles")
parser.add_option("-s",
"--use-datafile",
action="store_true",
default=False,
help="use usrp.dat (256kbps) as input")
(options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
sys.exit(1)
markfreq = 2200
spacefreq = 1200
bitrate = 1200
usrp_decim = 250
if_rate = 64e6 / usrp_decim #256e3
sf = (if_rate * 3) / 5 #153600
bit_oversampling = 8
sw_decim = int(sf / bitrate / bit_oversampling) #8
bf = sf / sw_decim
symdev = abs(markfreq - spacefreq) / 2
symcf = min(markfreq, spacefreq) + symdev
nbfmdev = 3e3
nbfmk = if_rate / (2 * pi * nbfmdev)
symk = bf / (2 * pi * symdev)
fg = gr.flow_graph()
if options.do_logging:
logger1 = gr.file_sink(gr.sizeof_gr_complex, "usrpout.dat")
logger2 = gr.file_sink(gr.sizeof_float, "demod.dat")
logger3 = gr.file_sink(gr.sizeof_float, "clkrec.dat")
logger4 = gr.file_sink(gr.sizeof_char, "slicer.dat")
if options.use_datafile:
src = gr.file_source(gr.sizeof_gr_complex, "usrp.dat")
else:
u = usrp.source_c()
u.set_decim_rate(usrp_decim)
if options.rx_subdev_spec is None:
subdev_spec = usrp.pick_rx_subdevice(u)
else:
subdev_spec = options.rx_subdev_spec
subdev = usrp.selected_subdev(u, subdev_spec)
print "Using RX d'board %s" % (subdev.side_and_name(), )
u.set_mux(usrp.determine_rx_mux_value(u, subdev_spec))
print "MUX:%x" % (usrp.determine_rx_mux_value(u, subdev_spec))
if options.gain is None:
g = subdev.gain_range()
gain = float(g[0] + g[1]) / 2
else:
gain = options.gain
subdev.set_gain(gain)
print "Gain set to", str(gain)
r = usrp.tune(u, 0, subdev, options.freq)
if r:
print "Frequency set to", options.freq
else:
print "Frequency set to", options.freq, "failed"
src = u
chan_taps = gr.firdes.low_pass(1, if_rate, 13e3, 4e3, gr.firdes.WIN_HANN)
chan = gr.fir_filter_ccf(1, chan_taps) #256e3
dee = blks.fm_deemph(fg, if_rate, 75e-6)
fmdem = gr.quadrature_demod_cf(nbfmk)
res_taps = blks.design_filter(3, 5, 0.4)
res = blks.rational_resampler_fff(fg, 3, 5, res_taps) #153600
lo = gr.sig_source_c(sf, gr.GR_SIN_WAVE, -symcf, 1)
mix = gr.multiply_cc()
r2c = gr.float_to_complex()
lp_taps = gr.firdes.low_pass(sw_decim, sf, 600, 2e3, gr.firdes.WIN_HANN)
lp = gr.fir_filter_ccf(sw_decim, lp_taps)
dem = gr.quadrature_demod_cf(symk)
alpha = 0.0001
freqoff = gr.single_pole_iir_filter_ff(alpha)
sub = gr.sub_ff()
_def_gain_mu = 0.05
_def_mu = 0.5
_def_freq_error = 0.00
_def_omega_relative_limit = 0.005
_omega = bit_oversampling * (1 + _def_freq_error)
_gain_omega = .25 * _def_gain_mu * _def_gain_mu
clkrec = gr.clock_recovery_mm_ff(_omega, _gain_omega, _def_mu,
_def_gain_mu, _def_omega_relative_limit)
slicer = gr.binary_slicer_fb()
pktq = gr.msg_queue()
sink = packetradio.hdlc_framer(pktq, 0)
watcher = queue_watcher_thread(pktq, rx_callback)
fg.connect(src, chan, fmdem, dee, res, r2c, (mix, 0))
fg.connect(lo, (mix, 1))
fg.connect(mix, lp, dem)
fg.connect(dem, (sub, 0))
fg.connect(dem, freqoff, (sub, 1))
fg.connect(sub, clkrec, slicer)
fg.connect(slicer, sink)
if options.do_logging:
fg.connect(src, logger1)
fg.connect(sub, logger2)
fg.connect(clkrec, logger3)
fg.connect(slicer, logger4)
fg.start()
fg.wait()