Dear URSP community, I'd like to launch some questions about the USRP x300 hardware (timing) calibration for a RF Record and Replay experiment using multifrequency GNSS, therefore using the two available RF frontends. I appreciate any help or hint you may provide.
The samples recording and replaying starts when a 1 PPS edge is detected.Also a very stable 10 MHz source is used. Would it be possible to measure the actual latency between the time a 1 PPS comes to the sma input port and the actual moment of the samples recording/replaying? If I'm not wrong this would give us, after a GNSS software demodulation and the latency removing, the total propagation delay from the GNSS antenna phase center to the internal USRP DAC. * Record setup: USRP x300 is connected to a RF splitter + DC block + and to a GNSS antenna for the recording setup. * Replay setup: USRP x300 is connected to the splitter as a combiner to join the two RF channels + DC block + 20dB atenuattor and its output to a GNSS receiver. To perform our tests we have been using the UHD software and we are able to aligned our 1 PPS to a GNSSt timescale. Thank you very much. Best regards, Raul Nieto
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