On 04/21/2016 11:41 AM, Michael Skaggs wrote:
I'm trying to time/sample synchronize RF recordings with two
B200minis. I am using the detached Metadata File Sink in GRC. Both
recordings are at 30MSps and both B200mini boards are synchronized to
the same 1PPS signal.
My issue is this, when I extract the data from the Metadata header
file, the "rx_time" value is only accurate to 10e-4 seconds (0.0001s).
Which, with a recording at 30MSps, this will only give me a sample
alignment accuracy to 10e-4(s)*30(MS/s) = 30,000 samples.
If I'm attempting to align the two recordings by samples or time, this
is not nearly accurate enough. Is there a way that I can get more
accuracy out of my metadata header or a way that I can synchronize the
recordings of these B200minis?
Thanks,
Michael
The precision of the timestamps from UHD should have a precision of
whatever the master-clock is on the device--how are you interpreting
the rx_time tag? It's two parts--a uint64 with the full-seconds
portion, and a double-precision float for the fractional part.
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