[time-nuts] Accurate Thunderbolt position
Mark Sims
holrum at hotmail.com
Mon Jul 13 22:04:36 UTC 2009
While playing with getting the Thunderbolt to supply a more accurate/reliable position, I came up with a way to filter the lat/lon/alt data in such a way that you can get a pretty darned accurate location (a quick test shows sub 1 foot accuracy should be doable).
The only problem is there seems to be no way to get the tbolt to accept and/or store that position. The 0x32 command that sets the "accurate" position only uses single precision numbers which are good to around 5 decimal points. The command that saves the survey position has no way of letting the user enter that position. Does anybody know of a way to get the Tbolt to accept an externally generated high-accuracy position?
The only way that I can think up that might work is to calculate the high accuracy position, put the unit into 3D fix mode, wait until it randomly comes up with a fix that is very close to the desired value (which may never happen), then put the unit into position hold mode... craptastic...
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