Hi,
Does anyone have idea how to make failsafe RTL when GPS fails? Here is some ideas:
OPTION 1:
If GPS fails ardupilot could calculate the distance and bearing to home using the init position fix and the last known position fix before the gps failure. Ardupilot could then take wind corrected magnetic heading towards home position fix and fly as long as the calculated distance would have been reached and then start orbiting with constant bank angle. Maybe with this method ardupilot could find its way close to the initial home position (Basic TIME/SPEED/DIRECTION based navigation).
OPTION 2:
Ardupilot could have some sort of radio signal direction finder which could be used to navigate towards transmitter signal (ADF/NDB-type navigation).
OPTION 3:
Ardupilot could navigate by using gsm cell based location information (DroneCell or equal could be used).
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