I use px4 AC3.5.4 with raspberry. My target is autonomous positioning drone in his local frame without global (gps). I arming drone in GUIDED_NOGPS mode and takeoff. I make request for my position in local frame with next command: vehicle.location.local_frame, but it return 'north=none, west=none, down=none' What did i do wrong?
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You have said that you are working with GUIDED_NOGPS mode so the GPS is disable.
Are you using PX4Flow sensor for position hold? You need a sensor to get the local position.
PX4Flow sensor is official supported from ardupilot.