[Discuss-gnuradio] Phase-lock across USRP-2 boxes and radar receiver development

[Mamoru Yamamoto]

Mr. Josh Blum, Mr. Matt Ettus,
Friends,

I think that you are following discussion on the mailing list
that is "phase-lock problem across USRP-2 boxes".
Mr. Juha Vierinen kindly helped us with the information that

-- USRP-2 FPGA with GNU Radio original does not support "phase-lock
across USRP-2 boxes".
-- USRP-2 FPGA with UHD supports that.
-- The "phase-lock across USRP-2 boxes" is the "NCO phase reset at PPS
input".

Are these true?  We are developing a radar receiver, and already
have a working program with GNU Radio original FPGA.  For us, easiest
way is to use a revised FPGA with "NCO reset at PPS" over GNU Radio.
Is there such version of the FPGA image?  The other way may be for us
to switch to the UHD.

What do you suggest?

As our application is a radar receiver.  Then in our program,
we apply the TX pulse to PPS input, and reset the time counter
at the TX pulses.  Is this possible with UHD?  This is
one critical point for us to move to UHD.

I hope your help.  Thanks.

Regards,

-- 
Mamoru Yamamoto / RISH, Kyoto University
address@hidden
Phone +81-774-38-3814, Cell +81-90-5653-7555