Hi USRP users!
I am using one N200 and one X310 to simultaneously capture the same signal from
2 channels. Both devices are syncronished by an external GPSDO. I am using the
attached GNURadio diagram. There is some time difference between both N200 and
X310 captures. When I process the files in Matlab I can check a time difference
of 103.7 ms between both signals (using cross-correlation). This value matches
with the value obtained by subtracting the fractional seconds part of the
rx_time values of both devices.
The Tag Debug block shows following information:
Tag Debug:
Input Stream: 00
Offset: 0 Source: usrp_source2 Key: rx_time Value: {0 0.200122}
Offset: 0 Source: usrp_source2 Key: rx_rate Value: 1e+07
Offset: 0 Source: usrp_source2 Key: rx_freq Value: 4.98e+08
Input Stream: 01
Offset: 0 Source: usrp_source1 Key: rx_time Value: {4 0.0964052}
Offset: 0 Source: usrp_source1 Key: rx_rate Value: 1e+07
Offset: 0 Source: usrp_source1 Key: rx_freq Value: 4.98e+08
My simple question is, why the seconds part has a difference of 4 seconds?
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