At the National Aerospace Laboratory of the Netherlands (NLR) a Postition Reference System for in-flight accurate position measurements based on GPS has been developed and validated. The system uses Differential GPS positions to correct the aircraft trajectory as delivered by an Inertial Reference System. Depending on the application, a medium accuracy (+ 5 m), an enhanced accuracy (+ 0.6 m) or a high accuracy (+ 0.15 m) update mode can be selected. The medium- and enhanced accuracy modes are available in both real-time and after the flight, the high accuracy mode is only available after the flight. In the paper the requirements for the Position Reference System will be given. The system hardware and software will be described. Until now the system has been used during a number of flight test programmes with Fokker prototype aircraft. A two month period of one of these programmes was selected, flight test data from this period were processed in each of the above mentioned update modes. The results will be shown and discussed.


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    Development of a position reference system for flight tests based on GPS

    Kannemans, H. / Storm/van Leeuwen, S. | TIBKAT | 1997


    Position Reference System for Flight Tests Based on GPS/IRS Integration

    S. S. van Leeuwen / R. van de Leijgraaf | NTIS | 1993


    A Position Reference System for Flight Tests Based On GPS/IRS Integration

    Van Leeuwen, S. S. / Van de Leijgraaf, R. / Society of Flight Engineers; The Seattle Chapter | British Library Conference Proceedings | 1993