On 5/6/2013 12:29 AM, Mark Sims wrote: > 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. >
Wow, thanks. I didn't realize that. This approach you described from lady heather sounds "really cool" from my time-nut perspective. I used the trimble provided utility for the survery. Really not sure if the internal firmware did the calculation and/or filtering, or what method was used. --Sarah _______________________________________________ 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.
