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From: | Michael West |
Subject: | Re: [Discuss-gnuradio] [USRP-users] Phase alignment for multiple USRP |
Date: | Fri, 16 Jun 2017 15:39:19 -0700 |
I am trying to build a coherent phase array receiver. I am using two X310 with four UBX-160 and a ocotoclock (10MHz and 1PPS) to have 4 Rx coherent receiver. However, every time when the machine is on, the phase offset between each receiver is aways random. I used the python to write my system and I have the following setups. Could anyone give some hint or suggestion how to make coherent phase arrayed receiver work without non-consistent phase offset every time?Many thanks for your time!All Best,Jack"""self.uhd_usrp_source_0.set_cloself.uhd_usrp_source_0.set_timck_source('external', 0) e_source('external', 0)
self.uhd_usrp_source_0.set_subdev_spec('A:0 B:0', 0)
self.uhd_usrp_source_0.set_clock_source('external', 1)
self.uhd_usrp_source_0.set_time_source('external', 1)
self.uhd_usrp_source_0.set_subdev_spec('A:0 B:0', 1)
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
self.uhd_usrp_source_0.set_time_unknown_pps(uhd.time_spec()) cmd_time = uhd.time_spec_t(0.1)
timenow = self.uhd_usrp_source_0.get_time_now() self.uhd_usrp_source_0.set_comself.uhd_usrp_source_0.set_gaimand_time(timenow + cmd_time) self.uhd_usrp_source_0.set_cen ter_freq(freq, 0) n(gain, 0)
self.uhd_usrp_source_0.set_antenna('TX/RX', 0)
self.uhd_usrp_source_0.set_center_freq(freq, 1)
self.uhd_usrp_source_0.set_gain(gain, 1)
self.uhd_usrp_source_0.set_antenna('TX/RX', 1)
self.uhd_usrp_source_0.set_center_freq(freq, 2)
self.uhd_usrp_source_0.set_gain(gain, 2)
self.uhd_usrp_source_0.set_antenna('TX/RX', 2)
self.uhd_usrp_source_0.set_center_freq(freq, 3)
self.uhd_usrp_source_0.set_gain(gain, 3)
self.uhd_usrp_source_0.set_antenna('TX/RX', 3)
self.uhd_usrp_source_0.clear_command_time() """
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