On 5/3/2018 9:26 AM, Mark Sims wrote:
Those results were with the "ultra rapid" orbits. It will be interesting to
see what they look like when the final precise orbits are available in a couple of weeks.
I also need to see how those values compare to Lady Heather's precision survey
results.
FWIW, a dual-frequency PPP run I did late last year has the following
uncertainties, when processed with the various IGS precision
ephemerides, via AUSPOS:
longitude latitude altitude
IGS UltraRapid 0.004m 0.003m 0.013m
IGS Rapid 0.004m 0.003m 0.012m
IGS Final 0.004m 0.003m 0.012m
The computed ECEF coordinates change by 0.003m(X) and 0.001m(Z) between
UltraRapid and Final.
...so really not much of a difference between UltraRapid and Final, at
least for a dual-frequency survey at my location.
*digs through old stuff*
Okay, found a single-frequency survey from mid-last-year, processed by CSRS:
longitude latitude altitude
NRCan Rapid 0.103m 0.121m 0.253m
IGS Final 0.103m 0.121m 0.252m
...not much difference there, either.
Both of these were with a roof-mounted antenna and a good skyview,
running 24 hours. The first was one measurement every 15 seconds, the
latter one measurement per second. (I think for these purposes, one
measurement every 15 seconds is more than sufficient and makes the files
process *so* much faster).
-j
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