[time-nuts] tracking position & orientation

[John Ackermann N8UR]

On 11/22/19 12:21 PM, Tim Lister wrote:

> You probably don't need to wait that many days for the Final GPS
> satellite orbits; the IGS products page
> (https://www.igs.org/products)shows that even the real-time
> ultra-rapid products are a factor of 20x better in the orbit (but
> interestingly not the satellite clocks) than the broadcast ephemeris.
> But if you are trying to find small drifts over a year, rather than
> say doing real-time RTK corrections, you have the luxury of time to
> wait for the absolute best orbits before doing the processing.

My (limited) experience with sending L1/L2 data to both NRCan and OPUS
is that there is a noticeable improvement from the "ultra-rapid" to the
"rapid" results a day or so later.  The difference from "rapid" to
"final" is barely noticeable (but is real).