GPS Coordinate System
Does anyone know the coordinate system used when KiwiSDR reports position? Is it WGS84?
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Does anyone know the coordinate system used when KiwiSDR reports position? Is it WGS84?
Comments
I think so. But it's been years since I looked at that stuff. WGS84 shows up a lot in the .h files here: https://github.com/jks-prv/KiwiSDR/tree/master/gps
Many thanks - we want to compare it with a survey grade GPS that uses NZGD2000 - we will just have to learn how to convert one to the other at the time the readings are taken.
Well, okay. But you have to remember the purpose and origin of the GPS code used in the Kiwi project before you go comparing it against a commercial GPS timing receiver.
The GPS code is from Andrew Holme's "Homemade GPS receiver" (http://www.aholme.co.uk/GPS/Main.htm), an extraordinary effort by a single individual starting from first principles. Missing many of the modern optimizations of commercial GPS code, but surprisingly functional nonetheless. Modified by myself to support Galileo/QZSS and Christoph for Kalman filtering of outliers (and many other changes) required to improve performance for use with the Kiwi TDoA function.
Just curiosity to compare them - The Kiwi results look very good.