| 摘要 |
In an aircraft conventionally-including a redundant pair of independent primary altitude determination systems of accuracy certified for RVSM operations, an initially loosely calibrated backup altimeter receives independent static pressure data for use in calculating altitude. During normal flight of the aircraft, the current altitude determinations of the primary altimeters and, using a recursive filter, the static source error correction (SSEC) of the backup altimeter is recursively adjusted until the SSEC attains a steady-state value with which the calculated altitude determinations by the backup altimeter accurately conform to the altitude determinations of the primary altimeters. Through this self-correction functionality the backup altimeter is rendered sufficiently accurate for permitted use in RVSM airspace in the event of a failure of one of the primary altitude determination systems.
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