% ------------------------------------------------------------------------- % % GNSS-SDR is a Global Navigation Satellite System software-defined receiver. % This file is part of GNSS-SDR. % % Copyright (C) 2010-2019 (see AUTHORS file for a list of contributors) % SPDX-License-Identifier: GPL-3.0-or-later % % ------------------------------------------------------------------------- % %help script to compare GNSS-SDR Preambles starts channel=3; % From GNSS_SDR telemetry decoder % 1 find preambles indexes preambles_index=find(GNSS_telemetry(channel).Preamble_symbol_counter==0); % 2 Get associated timestamp ms preambles_timestamp_sdr_ms=GNSS_telemetry(channel).prn_delay_ms(preambles_index); % From Matlab receiver [firstSubFrame, activeChnList, javi_subFrameStart_sample] = findPreambles(trackResults_sdr,settings); preambles_timestamp_matlab_ms=trackResults_sdr(channel).prn_delay_ms(javi_subFrameStart_sample(channel,1:6)); %Compare common_start_index=max(find(abs(preambles_timestamp_sdr_ms-preambles_timestamp_matlab_ms(1))<2000)); error_ms=preambles_timestamp_sdr_ms(common_start_index:(common_start_index+length(preambles_timestamp_matlab_ms)-1))-preambles_timestamp_matlab_ms.' % figure % stem(tracking_loop_start+javi_subFrameStart_sample(channel,:),1000*trackResults_sdr(channel).absoluteSample(javi_subFrameStart_sample(channel,:))/settings.samplingFreq); % % hold on; % % plot(GNSS_observables.preamble_delay_ms(channel,:)); % % plot(GNSS_observables.prn_delay_ms(channel,:),'r')