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Tips and questions relating to the GPS modules from SFE
By sythiel
I'm trying to implement a system based on accelerometers to assist GPS when the signal is weak or absent. I have a problem converting from GPS coordinates to the local reference system associated to the accelerometer. Anyone knows the formule to do this?

I can easily transform from GPS to ECEF but how do I transform from those to the local ones? The only info I have is the three acceleration and if I need to info coming from gyroscopes.

Thanks a lot for your help
I'm kind of desperate :-)