@PaulZC: I’m pretty sure that the US National Geodetic Survey intends OPUS (and OPUS-RS) to cover only the United States, using only reference stations that are located in the United States. I expect that’s why you got the “fewer than 3 useable reference stations remain” error. It’s not a global service (nor a PPP service).
NOAA CORS has Navigation Data (Ephemeris, and Precise Ephemeris) with global reach, basically a collection of data from all location. Observations come from US States and Territories, although there look to be a few others dotted around the world.
In the UK the CORS data could come from the Ordnance Survey
https://www.ordnancesurvey.co.uk/gps/os-net-rinex-data/
Not sure if they have a Post-Processing solver online, didn’t dig
I think the best practice is the post processing, each state has a reference cors even at 50km that provides rinex obs & nav data at 30s…
- your observation file
- cors file
- igs final products
100% success.
@wjc : I gave OPUS another try using the Static service. It did return a solution. Really not great, but a solution. I think the MORP Base Station is Morpeth, 42km away, but the other two are >1000km away in Switzerland… I’ll give it another go next week, once the Final data is available.
@PaulZC: Interesting; I’m impressed that OPUS worked for you as well as it did. It looks like ZIM2 is near Zimmerwald, Switzerland, MORP is near Cockle Park in Morpeth, England, and WAB2 is near Wabern, Switzerland. That is a poor geometry, with the two Swiss stations being far away and close to each other. There are other reference stations that are closer and better-distributed in azimuth (one near Aberdeen, Scotland; a few in the London area; one near Penzance; and several in Benelux and Germany. Perhaps it is a data availability issue, so yes, it’ll be worth seeing what another OPUS run will produce after some more time. Were you observing at a station for which you have an accurate location derived by other means? It would be interesting to see the difference between that location and the one eventually produced by OPUS, as a check of OPUS’s claimed uncertainties.