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From: | Michael Skaggs |
Subject: | Re: [Discuss-gnuradio] Higher Accuracy Metadata Header? |
Date: | Thu, 21 Apr 2016 14:59:04 -0400 |
The precision of the timestamps from UHD should have a precision of whatever the master-clock is on the device--how are you interpretingOn 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 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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