I’m using the u-blox ZED-F9P and the cheapest no-name saucer-type L1/L2 antenna I could find, to log data from a fixed location in 24 hour blocks. I send my RINEX .obs to the Canadian service from natural-resources.canada.ca (in my case using only GPS and GLONASS, not Galileo etc) for Static-PPP processing.
After getting seven days of data, I find the fixes are within a circle 7.4 mm in radius. Is that the expected result? I’m running the
data just a few hours after the end of each UTC day, so this is using “ultra-rapid” orbit data. My location has trees and houses at least partially covering most azimuthal directions up to 20 to 30 degrees above horizontal.
Hi John,
Personally, I’d say 7mm is a good result for a Multi-Path Environment 
As you probably already know, you can resubmit your RINEX to process the 7 missions again with better orbit data.
Did you have decent agreement between the elevations?
Did you notice anything unusual in the Quality Reports?
Your results are somewhat as expected. Take a look at a site like:
There are thousands of base stations with PPP time series data. I’d look at the fixed plate plots. You will see a bit higher position variation then what you got, but that’s because your sample size is tiny compared to multiple years for most of the sites. If you sampled for 20 days let alone 20 years your position spread would increase.
Be aware that some of the sites have poor data, some are near the edge of tectonic plates, and there are a host of other issues that a particular site might have. Click around and look at a variety of the sites. Maybe click on a bunch in your area to see what’s happening locally.
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