CPC G01C 5/06 (2013.01) [B64D 45/04 (2013.01); G01C 5/005 (2013.01); G01S 1/18 (2013.01); G01S 19/20 (2013.01); G01W 1/02 (2013.01); G08G 5/0008 (2013.01); G08G 5/0021 (2013.01)] | 9 Claims |
1. A method comprising:
determining that a barometric altimeter in an ownship aircraft is configured in a mode other than standard (STD) mode;
comparing a corrected altitude measurement from the barometric altimeter to a second source of altitude information, the second source of altitude information comprising one of an average and a weighted average of:
a GPS-determined altitude of the ownship aircraft; and
a sum of a radio altitude of the ownship aircraft and a terrain elevation proximate to the ownship aircraft; and
generating an alert in response to determining that the corrected altitude measurement deviates from the second source of altitude information by more than the variable altitude error threshold.
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