My Ashtech Z12 system has located my g-spot to within 4mm lat/lon and 27mm altitude. I used the OPUS-RS system to process 1.5 hours of data using 9 baselines to national CORS reference stations and the rapid (1-day) orbits... not too shabby for 15+ year old technology. The fix should be even more accurate when the precise (two week) orbits are available.
Now, if I can only get those numbers into the Tbolt... Doing some statistical hand waving over the fixes produced by the Tbolt, I think I can get it to find its antenna to within around 1 foot. So far, the fixes that I can get it to produce look much better than the standard self survey results. Again, it may be an exercise in futility if I can't get the Tbolt to accept and store a precise location. ---------------------------------------- A GPS guy I know comments that when you start talking down in the sub-meter sorts of accuracies, particularly for absolute measurements, there's a whole raft of factors that are all of the same general magnitude that you need to take into account: tidal deformation, ionosphere, multipath, thermal distortion of your antenna, changes in the cable due to temperature, etc.etc.etc.> ***************************************** _________________________________________________________________ Windows Live™: Keep your life in sync. http://windowslive.com/explore?ocid=TXT_TAGLM_WL_BR_life_in_synch_062009 _______________________________________________ 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.
