On 02/02/2023 04:56, Raúl Nieto Freire wrote:
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
You're presumably using RFNoC to do the replay? Because otherwise,
latency is wildly unpredictable.
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