Abstract:

Flight inspection is a basic condition to ensure the accuracy and reliability of navigational equipment by checking and modulating the signal errors to minimum in order to improve flight safety and efficiency. At present, GPS positioning and survey signal are adopted as the sole source, but actually, GPS itself also has errors possibly with real time positioning or navigation device coordinate errors introduced by surveying. Once the positioning error signal source appears, the induced error will result in wrong guidance for flight. Based on theoretical analysis of GPS limitations as datum reference, a set of VOR over & orbit fly procedure is developed by a mathematical model to eliminate the positioning defects from traditional GPS, making effort to improve VOR flight inspection accuracy by inter-checking and to eliminate errors.

Key words: flight inspection, calibration procedure, bearing error, evaluation of measurement uncertainty