Oh... 24 bit mantissa should give 1.25 m resolution if my headcounting is about right. Thats about 4 ns. Royal kludge indeed. Cheers Magnus
-------- Originalmeddelande -------- Från: Mark Sims <hol...@hotmail.com> Datum: Till: time-nuts@febo.com Rubrik: [time-nuts] GPS position survey The 48-hour precision survey in Lady Heather uses a statistical weighted median filter to arrive at its final location instead of a simple average of fixes. It processes data of one minute, hour, and overlapping 24 hour intervals to calculate the final position. It can produce a location that is 3-10 times better than simple averaging of the fixes. A further complication is storing the precise location into the receiver. The Tbolt firmware only lets one write the location using single precision floating point numbers (24 bit mantissa). This is well below the desired resolution of the position. Lady Heather gets around this by limitation by doing a royal kludge. Once the precise position has been calculated, it issues single point survey commands to the receiver until one just happens to lie within one foot of the calculated position. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.