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Swap I/Q in two bit cpx interleaved file signal source 

Some adjustments in the example configuration file to improve receiver
sensitivity
This commit is contained in:
Javier 2015-07-03 15:37:30 +02:00
parent 6c0377ed06
commit 0927394351
2 changed files with 44 additions and 24 deletions
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36
conf/gnss-sdr_GPS_L1_two_bits_cpx.conf
View File

@ -31,7 +31,7 @@ GNSS-SDR.SUPL_CI=0x31b0
SignalSource.implementation=Two_Bit_Cpx_File_Signal_Source
;#filename: path to file with the captured GNSS signal samples to be processed
SignalSource.filename=/datalogger/captures/ajith/test1_two_cpx_sig2_60.dat
SignalSource.filename=/datalogger/captures/ajith/test1_two_cpx_live.dat
;#item_type: Type and resolution for each of the signal samples. Use only gr_complex in this version.
SignalSource.item_type=byte
@ -52,7 +52,7 @@ SignalSource.samples=0
SignalSource.repeat=false
;#dump: Dump the Signal source data to a file. Disable this option in this version
SignalSource.dump=true
SignalSource.dump=false
SignalSource.dump_filename=../data/signal_source.dat
@ -86,7 +86,7 @@ DataTypeAdapter.item_type=gr_complex
InputFilter.implementation=Freq_Xlating_Fir_Filter
;#dump: Dump the filtered data to a file.
InputFilter.dump=true
InputFilter.dump=false
;#dump_filename: Log path and filename.
InputFilter.dump_filename=../data/input_filter.dat
@ -147,7 +147,7 @@ InputFilter.sampling_frequency=19200000
;#The following options are used only in Freq_Xlating_Fir_Filter implementation.
;#InputFilter.IF is the intermediate frequency (in Hz) shifted down to zero Hz
InputFilter.IF=-4024000
InputFilter.IF=4024000
;# Decimation factor after the frequency tranaslating block
InputFilter.decimation_factor=6
@ -179,7 +179,7 @@ Resampler.sample_freq_out=2048000
;######### CHANNELS GLOBAL CONFIG ############
;#count: Number of available GPS satellite channels.
Channels_GPS.count=8
Channels_GPS.count=6
;#count: Number of available Galileo satellite channels.
Channels_Galileo.count=0
;#in_acquisition: Number of channels simultaneously acquiring for the whole receiver
@ -195,26 +195,30 @@ Channel.signal=1C
;######### GPS ACQUISITION CONFIG ############
;#dump: Enable or disable the acquisition internal data file logging [true] or [false]
;#dump: Enable or disable the acquisition internal data file logging [true] or [false]
Acquisition_GPS.dump=false
;#filename: Log path and filename
Acquisition_GPS.dump_filename=./acq_dump.dat
;#item_type: Type and resolution for each of the signal samples. Use only gr_complex in this version.
Acquisition_GPS.item_type=gr_complex
;#if: Signal intermediate frequency in [Hz]
;#if: Signal intermediate frequency in [Hz]
Acquisition_GPS.if=0
;#sampled_ms: Signal block duration for the acquisition signal detection [ms]
Acquisition_GPS.sampled_ms=1
;#implementation: Acquisition algorithm selection for this channel: [GPS_L1_CA_PCPS_Acquisition] or [Galileo_E1_PCPS_Ambiguous_Acquisition]
Acquisition_GPS.implementation=GPS_L1_CA_PCPS_Acquisition
Acquisition_GPS.implementation=GPS_L1_CA_PCPS_Acquisition_Fine_Doppler
;#threshold: Acquisition threshold
Acquisition_GPS.threshold=0.0075
;#pfa: Acquisition false alarm probability. This option overrides the threshold option. Only use with implementations: [GPS_L1_CA_PCPS_Acquisition] or [Galileo_E1_PCPS_Ambiguous_Acquisition]
;Acquisition_GPS.pfa=0.01
Acquisition_GPS.threshold=0.007
;#pfa: Acquisition false alarm probability. This option overrides the threshold option. Only use with implementations: [GPS_L1_CA_PCPS_Acquisition] or [Galileo_E1_PCPS_Ambiguous_Acquisition]
;Acquisition_GPS.pfa=0.0001
;#doppler_max: Maximum expected Doppler shift [Hz]
Acquisition_GPS.doppler_max=10000
;#doppler_max: Doppler step in the grid search [Hz]
;#doppler_max: Maximum expected Doppler shift [Hz]
Acquisition_GPS.doppler_min=-10000
;#doppler_step Doppler step in the grid search [Hz]
Acquisition_GPS.doppler_step=500
;#maximum dwells
Acquisition_GPS.max_dwells=15
;######### ACQUISITION CHANNELS CONFIG ######
;#The following options are specific to each channel and overwrite the generic options
@ -231,16 +235,16 @@ Tracking_GPS.item_type=gr_complex
Tracking_GPS.if=0
;#dump: Enable or disable the Tracking internal binary data file logging [true] or [false]
Tracking_GPS.dump=false
Tracking_GPS.dump=true
;#dump_filename: Log path and filename. Notice that the tracking channel will add "x.dat" where x is the channel number.
Tracking_GPS.dump_filename=../data/epl_tracking_ch_
Tracking_GPS.dump_filename=./tracking_ch_
;#pll_bw_hz: PLL loop filter bandwidth [Hz]
Tracking_GPS.pll_bw_hz=45.0;
Tracking_GPS.pll_bw_hz=40.0;
;#dll_bw_hz: DLL loop filter bandwidth [Hz]
Tracking_GPS.dll_bw_hz=2.0;
Tracking_GPS.dll_bw_hz=1.5;
;#fll_bw_hz: FLL loop filter bandwidth [Hz]
Tracking_GPS.fll_bw_hz=10.0;

32
src/algorithms/signal_source/gnuradio_blocks/unpack_byte_2bit_cpx_samples.cc
View File

@ -69,19 +69,35 @@ int unpack_byte_2bit_cpx_samples::work(int noutput_items,
//* Most Significant Nibble - Sample n
//* Least Significant Nibble - Sample n+1
//* Packing order in Nibble Q1 Q0 I1 I0
//normal
// signed char c = in[i];
// //Q[n]
// sample.two_bit_sample = (c>>6) & 3;
// out[n++] = (2*(short)sample.two_bit_sample+1);
// //I[n]
// sample.two_bit_sample = (c>>4) & 3;
// out[n++] = (2*(short)sample.two_bit_sample+1);
// //Q[n+1]
// sample.two_bit_sample = (c>>2) & 3;
// out[n++] = (2*(short)sample.two_bit_sample+1);
// //I[n+1]
// sample.two_bit_sample = c & 3;
// out[n++] = (2*(short)sample.two_bit_sample+1);
//I/Q swap
signed char c = in[i];
//Q[n]
sample.two_bit_sample = (c>>6) & 3;
out[n++] = (short)sample.two_bit_sample;
//I[n]
sample.two_bit_sample = (c>>4) & 3;
out[n++] = (short)sample.two_bit_sample;
//Q[n+1]
sample.two_bit_sample = (c>>2) & 3;
out[n++] = (short)sample.two_bit_sample;
out[n++] = (2*(short)sample.two_bit_sample+1);
//Q[n]
sample.two_bit_sample = (c>>6) & 3;
out[n++] = (2*(short)sample.two_bit_sample+1);
//I[n+1]
sample.two_bit_sample = c & 3;
out[n++] = (short)sample.two_bit_sample;
out[n++] = (2*(short)sample.two_bit_sample+1);
//Q[n+1]
sample.two_bit_sample = (c>>2) & 3;
out[n++] = (2*(short)sample.two_bit_sample+1);
}
return noutput_items;