On 4/25/21 6:02 AM, Bob kb8tq wrote:
Hi
The thing that I find useful about a GPS simulator is it’s ability to calibrate
the
time delay through a GPS based system. In the case of a GPSDO, there may be
things beyond the simple receiver delay that get into the mix. Getting the
entire
offset “picture” all at once is nice thing. Yes, that’s a Time Nutty way to
look at it…..
So far, I have not seen anybody extending this sort of calibration to the low
cost
SDR based devices. Without digging into the specific device, I’m not sure how
well a “generic” calibration would do. Indeed, it might work quite well. Without
actually doing it … no way to tell.
So if anybody knows of the results of such an effort, I suspect it would be of
interest to folks here on the list.
Bob
A double difference kind of relative measurement might be useful -
compare two (or three) GNSS receivers. Then the absolute timing of the
test source isn't as important.
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