[time-nuts] Low-long-term-drift clock for boardlevelintegration?
wb6bnq at cox.net
Mon Feb 20 05:48:10 UTC 2012
That may be, but I think he indicated he was using the common hobby type units. I
seriously don't think they measure up to your unit. I should have stated I was
speaking specifically about GPS by itself not using differential methods.
Your comments are noted, however. Thanks,
SAIDJACK at aol.com wrote:
> In a message dated 2/19/2012 21:21:35 Pacific Standard Time, wb6bnq at cox.net
> 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 âsurveyâ 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.
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