In a message dated 2/19/2012 21:21:35 Pacific Standard Time, [email protected] 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
