If you are using a dual frequency receiver and solving for a stationary rover you can usually use more distant stations. Ideally you will find a “GNSS” site within 20 kilometers but if not you may be successful generating fixed solutions with stations up to 100 km or more away. Notice that some stations are GPS only and some are labelled as “GNSS” which indicates that they support multiple constellations, usually GPS and Glonass, but sometimes Galileo as well. If you’re not so lucky you may find only one or two distant choices. Zoom into your local area and if you are lucky you should see something like the screen shot below with several nearby choices. In the U.S, the easiest way to do this is to go to the NOAA User Friendly CORS website and click on the CORS Map link. The first step is to find a nearby CORS station.
TOPCON GPS BASE STATION CODE
with u-blox receivers and the demo5 RTKLIB code since this is what I am most familiar with, but most of the information in this post will apply to other receivers as well as to CORS stations in other countries. I will describe using CORS stations inside the U.S. Of course, If you have a CORS station near enough, it is also possible to run solutions directly from your rover to the CORS base but I generally opt for the local base since the solutions will be more accurate and more robust.įor the most part, running a PPK solution against a CORS base is very similar to the local base solutions I describe in many of my other posts but there are a few important differences that I will try to go over in this post. Running a post-processed kinematic (PPK) solution with your own local base receiver as rover and a nearby Continuous Operating Reference Station (CORS) as base is usually the easiest way to do this. To do this, you will first need to determine the precise location of your local base receiver. This will give you the shortest baseline, maximum number of usable constellations, and no issues with the Glonass hardware biases that come from using unmatched receivers. Generally, you will get the best RTK/PPK solutions using two matched receivers, one as rover, and one as a local base.
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