Greetings. I am a new user of the RS2. I’ve downloaded the version of RTK post listed on the emilid site:
I’ve tried to do something very very simple. I set up one RS2 on a tripod to use as a base station. I then took a second RS2 and used it as a rover to log a total of two locations and I’ve logged each location twice, a few minutes apart. I occupied one location for 2 minutes each time and the other for 3 minutes. I then did PPK both using my RS2 base station and also using a CORS station that is just a few kilometers away.
After doing the PPK using RTKpost, I then calculate the mean position for each location using the CSV file from the RS2 (that indicates the starting and stopping time involved in logging each location) along with the *.pos file from the RS2 (that logs EVERY location from when project was started to when it ends). Obviously, the *.pos file is a very big file and, as many on the forum have noted, you need to snip out the points for each location and calculate a mean position for each location. I’ve done this using the Point Extractor program that has been discussed on the forum: : PPK point extractor software
I wanted to check the precision of the RS2 coordinates by comparing the 2 sets of coordinates for my two locations. The short answer is that the agreement is not at all good. When looking at the uncorrected data (no PPK) the coordinates are off by 0.2-0.3 m (lat/long coordinates differ in the 6th decimal place). This is not too bad for uncorrected data. Pretty good actually. But after PPK using the other RS2 as a base, the coordinates are off by 20-30 meters (lat/long coordinates differ in the 4th decimal place).
I get similar results when I use data from a nearby CORS station as the base.
This is just awful.
Any suggestion on what I might be doing wrong?