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https://github.com/gnss-sdr/gnss-sdr
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33 lines
1.1 KiB
Mathematica
33 lines
1.1 KiB
Mathematica
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%help script to compare GNSS-SDR Preambles starts
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channel=3;
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% From GNSS_SDR telemetry decoder
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% 1 find preambles indexes
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preambles_index=find(GNSS_telemetry(channel).Preamble_symbol_counter==0);
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% 2 Get associated timestamp ms
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preambles_timestamp_sdr_ms=GNSS_telemetry(channel).prn_delay_ms(preambles_index);
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% From Matlab receiver
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[firstSubFrame, activeChnList, javi_subFrameStart_sample] = findPreambles(trackResults_sdr,settings);
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preambles_timestamp_matlab_ms=trackResults_sdr(channel).prn_delay_ms(javi_subFrameStart_sample(channel,1:6));
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%Compare
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common_start_index=max(find(abs(preambles_timestamp_sdr_ms-preambles_timestamp_matlab_ms(1))<2000));
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error_ms=preambles_timestamp_sdr_ms(common_start_index:(common_start_index+length(preambles_timestamp_matlab_ms)-1))-preambles_timestamp_matlab_ms.'
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% figure
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% stem(tracking_loop_start+javi_subFrameStart_sample(channel,:),1000*trackResults_sdr(channel).absoluteSample(javi_subFrameStart_sample(channel,:))/settings.samplingFreq);
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%
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% hold on;
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%
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% plot(GNSS_observables.preamble_delay_ms(channel,:));
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%
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% plot(GNSS_observables.prn_delay_ms(channel,:),'r')
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