[time-nuts] Low-long-term-drift clock for board levelintegration?
SAIDJACK at aol.com
SAIDJACK at aol.com
Mon Feb 20 05:33:33 UTC 2012
In a message dated 2/19/2012 21:21:35 Pacific Standard Time, wb6bnq at cox.net
writes:
Doing a few fixes for 30 minutes will, under best conditions, get you
somewhere on a circumference around your location with a radius of 15 meters
(50 feet). For GPS to get a useful coordinate result with meaningful data
will take longer than 30 minutes or so. Typically, you would want to do a 48
hour “survey” of your position to try to achieve a 3 to 5 meter
resolution. However, that only gives you an idea of where the GPS antenna was
Bill, that may have been true for some older commercial GPS receivers, but
not for the newer high performance receivers.
We did "flight testing" of our FireFly-IIA unit fed from a GPS simulator,
and the results are:
better than 0.8 meters horizontal accuarcy rms
better than 2.1 meters vertical accuracy rms
This was then verified in a Turboprop airplane. This was in the USA with
WAAS being active.
30 minutes should be more than enough to get a position with the above
accuracy at very high confidence levels.
bye,
Said
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