Using this new ephemeris data, when it becomes available, combined with the receiver’s raw data, better fixes can be computed. Ground stations bounce lasers off the individual satellites as they pass overhead and use this new data to compute the actual orbits of the satellites. It’s a similar process but involves bouncing frick’n lasers off of satellites!Ī major problem is that the predicted orbits are often off by one meter or more. Instead, PPP or Precise Point Positioning is far more accurate and is recommended for obtaining your antenna’s position. While a survey-in is easy to set up and fine for an in-the-field way to establish the location of a base, it’s not recommended for getting the fixed location of a static base station as it is less accurate. Why don’t I just survey-in my fixed antenna to get its location? It’s as if you need a soldering iron to assemble your soldering iron kit. The problem is ‘what is the location of the antenna?’. The ZED-F9P has a much faster way to provide base corrections: if you know the location of your antenna, you can set the coordinates of the receiver and it will immediately start providing RTCM corrections. The temporary base method is flexible, but it is not as accurate and can vary dramatically in time required. In the previous tutorial we described how to create a temporary base station with the 1 to 10 minute survey-in method.
Yes we will talk about NTRIP clients and servers and mount points, but don’t worry it’s just passing bytes from one computer to another over the internet. This tutorial will show you how to generate your own GNSS correction data and push it to the internet, all for free (or the cost of a dedicated mini-PC if you need it)! You’ll be your own music streaming service! Your rover will be able to listen to that correction data using a cell phone connection. All these RTCM services charge different amounts of money and act just differently enough to be confusing. Similarly, there are all sorts of sources for RTCM (Trimble, Leica, Telit, etc). There’s a ton of services out there for music (youtube, Spotify, Pandora). For your rover to jam, you need to provide it a constant source of music.
Think of it like a music stream for your rover. NTRIP is just a fancy means of getting correction data from a spot, over the internet, to a rover. I found all the descriptions and graphics describing NTRIP to be frustratingly confusing.
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