Patent ID: 8380458

Claim:
A method, in a mobile device, for in-flight detection, the method comprising: providing two acceleration indicators {A i-1 , A i }; determining, by the mobile device, a difference acceleration (dÂ) between the two acceleration indicators {A i-1 , A i }; splitting, by the mobile device, the difference acceleration (dÂ) into orthogonal components comprising an estimated horizontal acceleration (dÂ H ) and an estimated vertical acceleration (dÂ V ) based on an estimated direction of gravitational acceleration; comparing, by the mobile device, an acceleration value comprising a vertical acceleration with a first threshold (Th 1 ) to determine a first comparison result; comparing, by the mobile device, a value comprising the estimated horizontal acceleration (dÂ H ) with a second threshold (Th 2 ) to determine a second comparison result; and setting, by the mobile device, an in-flight indicator, indicating whether the mobile device is in flight within an airplane, based on the first and second comparison results.