[time-nuts] Low-long-term-drift clock for boardlevelintegration?

WB6BNQ wb6bnq at cox.net
Mon Feb 20 05:48:10 UTC 2012

Hi Said,

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
>  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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