[time-nuts] nuts about position (cheap receiver)
jimlux at earthlink.net
Thu May 3 11:38:37 EDT 2018
On 5/3/18 8:28 AM, Bob kb8tq wrote:
> If you have a very good survey grade receiver and take a long enough data set, yes you can
> watch your location drift in some parts of the world. In most locations, fixes a few years apart
> would be a better bet.
> Indeed this does get a bit far from the world of timing …… The distances involved are nasty
> small. Even for the location of your telescope when doing astronomical timing observations,
> they are unlikely to matter on a yearly basis. At some point the error is “to small to matter” ….
Hit send too quick..
But more realistically, this is kind of a time-nutty sort of goal - to
be able to make measurements to a precision where you can match your
measurements to a nearby geodetic station with "official" measurements.
All the usual time measurement with GPS issues come into it - multipath,
the diurnal variations, solid earth tides.
It's what everyone says - getting to meters or 10s of ns - easy -
getting to tenths of ns or cm, significantly harder.
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