[USRP-users] GPSDO Time Synchronization
scott.johnston at ll.mit.edu
Tue Feb 19 14:17:48 EST 2013
I am having trouble with GPSDO Time Synchronization across multiple
USRPs that are connected to separate computers and each one has its own
I am observing that about half the time, two or more USRPs will disagree
about what time it is. I'm testing this by transmitting from one USRP
and receiving that signal split into two USRPs. I then compare the
difference in time in the stream tags of the two receiving USRPs to the
difference in time when they start receiving the common transmitted signal.
Sometimes its the same and sometimes it is exactly 1 second off.
The GRC file I used on the receive side is attached. The transmit side
is irrelevant, as long as the signal is split into receivers.
I have ensured that the GPSDO units are locked to GPS.
Can someone please explain how to fix this 1 second ambiguity?
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