Two-way-going with USRP n210

Hi all

I'm doing a two-way-going using the USRP n210. To be able to do that, I will need to know the exact time that samples have been sent and the time that I have received back.
Trying to implement that I want to use 2 USRPs linked together.
(USRP HAS)              (USRP B)
TX<----------------->
rx -----------------> tx

For the porpuses first test, I used a single USRP linking the RX and TX together. With the help of a simple flow in the RRB graph I out a pulse (using the vector source) and at the same time, I have everything from the entrance of the USRP stored in a file (using the file sink block). For comparison, I also used a file sink block in the output.

Testing again the difference between when I starts the code and the time the impulse arrives at the RX looks like that there is a kind of random delay. The difference between the send and receive in return the pulse fluctuates around 8000 ~ 10000 samples. Because I use a single USRP with RX and TX interconnected I though that this time limit should be almost zero.

There's a better way to implement what I can get better accuracy in the timestamp?

One solution that has helped me to solve my problem was using the following code in the code generated by the companion of GNU python:

now = self.uhd_usrp_sink_0.get_time_now (#Store) the real time of the FPGA
Self.uhd_usrp_source_0.set_start_time (UHD.time_spec_t (1) + now) #Set the source to start 1 second after the real time of the FPGA
Self.uhd_usrp_sink_0.set_start_time (UHD.time_spec_t (1) + now) #Set the sink to start 1 second after the real time of the FPGA

In this way both tx and rx, will begin at the same time.

Tags: NI Products

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