[time-nuts] nuts about position
pmonta at gmail.com
Thu Apr 26 00:43:47 EDT 2018
Jim Lux writes:
> But another poster did comment on "why not use the telescope" you could
> precision point to a series of stars and calculate using celestial nav
> where you are. Although, that might be painful to the 1 meter sort of
> accuracy - the "tables" probably don't really account for deviations from
> ellipsoid and so forth.
I took a shot at this recently, using the optical signal available from
GPS, Project Echo style:
It would be difficult to get to 0.3 meter, though. More like 15 meter
single shot, maybe 5 meter with averaging.
As the other responses point out, this is routine for GNSS surveying. A
few hours of dual-frequency GPS data is enough for accuracy of a few
centimeters. If reference stations such as CORS are available, the "rapid
static" solvers cut the needed session time to 20 or 30 minutes. Set up a
reference mark in a clear area, get its position, then use a total station
to do optical ties to other local marks like the telescope mount.
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