Flight checking of GPS non-precision approaches differs from checking conventional non-precision approaches as there is no direct influence on the accuracy and availability of the GPS signal. Only local abnormalities and interference can be detected. Due to the global relationship between the runway and the GPS approach procedure, the check of the navigation data base must assure the correctness of all way point data. Methods to validate the data base are discussed. Flight checking of GPS non-precision approaches can use as a reference system either a laser tracker and/or differential GPS. Using a position update at threshold may substitute the laser tracker reference system. Finally the paper summarises the experiences gained during the flight checking of the first 8 GPS non-precision approaches that are implemented on a trial basis in Germany.
展开▼
