I am trying to synchronise two USRP N210 with the goal of receiving
I’ve modified the rx_samples_to_file.cpp code according to this page:
It seems that the signals at the USRPs have between +0.2 and -0.2 us
This time difference seems to be random, as it changes every time I run
Does anyone know why the samples receive at these two USRPs are still
I thought the time difference should be less than 100ns.
What’s the right way to minimize the time difference??
Here is the setup and the code snippet that I’ve add to the example
- USRP N210 with internal GPSDO module, daughtherboard is DBSRX2
- Signal generator outputs a common signal and connects to the two USRPs
through equal length cables
Transmitter part: Common signal is FM signal with 1MHz bandwidth,
frequency is 1.6GHz.
Receiver part: Sampling rate is 5Msps
For Common Reference Signals
For synchronising the Device Time
Because each N210 has an internal GPDSO module, the device times are
For Synchronising Channel Phase
To align CORDIC:
uhd::stream_cmd_t stream_cmd((num_requested_samples == 0)?
stream_cmd.num_samps = num_requested_samples;
stream_cmd.stream_now = false;
stream_cmd.time_spec = uhd::time_spec_t(time_to_receive);
To align LOs in the frontend:
uhd::time_spec_t cmd_time = usrp->get_time_now() +
For DBSRX2, does this method for aligning LO work?