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From: | Skyvalakis Konstantinos |
Subject: | Phase Synchronize 2 USRP N200 w/ SBX cards |
Date: | Wed, 9 Jun 2021 14:11:52 +0000 |
I have 2 USRP N200 devices, each one equipped with an SBX daughterboard.
I am providing 10MHz ref clock and 1 PPS input on both devices with equal length cables, from an external signal generator.
My application is DoA. Is it possible to do it, with 2 USRP N200 and the SBX daughterboards?
1) Is the following timed commands code snippet correct for frequency and phase synchronization of both SBX cards?
",".join(("addr0=192.168.10.2, addr1=192.168.10.3", "")), uhd.stream_args( cpu_format="fc32", channels=range(2), ), ) self.source.set_clock_source('external', 0) self.source.set_time_source('external', 0) self.source.set_clock_source('external', 1) self.source.set_time_source('external', 1) self.source.set_samp_rate(2e6) self.source.set_time_unknown_pps(uhd.time_spec()) self.source.set_gain(50, 0) self.source.set_antenna('RX2', 0) self.source.set_gain(10, 1) self.source.set_antenna('RX2', 1) time.sleep(1) self.source.clear_command_time() self.source.set_command_time(self.source.get_time_now() + uhd.time_spec_t(0.1)); self.source.set_center_freq(uhd.tune_request(868e6,0), 0) self.source.set_center_freq(uhd.tune_request(868e6,0), 1) time.sleep(0.11) self.source.clear_command_time()
2) Is there anyway to measure and compensate the offset between the 2 SBX daughterboards?
3) Can this synchronization problem be tackled easier with a MIMO cable (since I do have one) ?
Thank you in advance.
Konstantinos |
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