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A Preliminary Evaluation Test of GPS/DGPS Navigation System
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English
Abstract
The National Aerospace Laboratory (NAL) has been conducting basic research on the future landing navigation system of airplanes and a proposed future unmanned reentry space vehicle, using NAL research airplane Dornier Do-228 in which a Collins NAVCORE- I GPS C/A receiver was installed. A ground-to-air data link system was developed in order to realize the real time DGPS operation which improves accuracy. In this paper, experimental evaluation test results of not only GPS stand-alone operation but also DGPS operation are discussed. Since the navigation algorithm in the NAVCORE- I receiver could not be modified, this paper mainly discusses the difference of the two operations.
In fixed point ground tests, ground and onboard GPS receivers were connected to the same antenna in order to avoid common errors, and both receivers output positions were compared with a reference map position. In the flight tests, approach/landing flights were conducted. Do-228 was tracked during flight by a laser tracker, which provides subsequent data on a reference aircraft's position. Onboard GPS receiver output position data was compared to the laser tracker data.
From these test results, it was experimentally shown that SA error, which is added to degrade the positioning accuracy of civilian GPS users and is the largest error source, was eliminated by the DGPS operation technique. In addition, the quantitative position accuracy data of GPS/DGPS was obtained.
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Authors
Citation
Ono, T., Ishikawa, K., Miyazawa, Y., and Murata, M., "A Preliminary Evaluation Test of GPS/DGPS Navigation System," SAE Technical Paper 940012, 1994, https://doi.org/10.4271/940012.Also In
References
- Murata, M. Harigae, M. The Observation and Analysis of Selective Availability in GPS NAL TR-1105 April 1991
- Mickelson, A.W. J. Carrico. M.J. Development and Flight Evaluation of an Integrated GPS/INS Navigation System AIAA-89-3498-CP August 1989
- Edwards, F.G. Hegarty, D.M. Flight-Test Evaluation of Civil Helicopter Terminal Approach Operations Using Differential GPS AIAA-89-3635-CP August 1989
- Flight Research Division NAL Dornier 228- 200 Flight Research Airplane - Present Status and Outline of the Installed Equipment - NAL TM-637 July 1991
- Collins NAVCORE- I GPS C/A RECEIVER Instruction Manual January 1989
- Ono, T. Ishikawa, K Kojima, T. DGPS System installed in the NAL Dornier 228 (Part I ) Proceedings of The 22nd Japan Society for Aeronautical and Space Sciences Conference April 1991
- Ono, T. Ishikawa, K. Performance Evaluation Tests of the GPS/DGPS Navigation System installed in the NAL Dornier 228 - Preliminary ground test results - NAL TM-649 August 1992
- Navigation and Flight Experiment Team Flight Evaluation of Approach/Landing Navigation Sensor Systems - Summary of 1990 Flight Experiments - NAL TR-1175 July 1992
- Ishikawa, K. Ono, T. Murata, M. Flight Evaluation of DGPS Proceedings of The 1st Transportation and Logistics Conference August 1992