New answers tagged ephemeris
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You can find a C++ method contained in the source code of Andrew Holme homemade GPS receiver project. The method is called GetXYZ and is the EPHEM (ephemeris) namespace and looks as the following:
void EPHEM::GetXYZ(double *x, double *y, double *z, double t) { // Get satellite position at time t
// Time from ephemeris reference epoch
double t_k = ...
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