Developing and Expert System to Support GPS Integration

David Henkel

Abstract:	Expert systems are tools used to apply Artificial Intelligence techniques to real-world problems. Expert systems simulate the problem solving process of human experts. The knowledge of one or more experts is captured and stored in such a way that it can be used to help solve problems and determine current system status. Complex system testing requires quick decisions based on complex data. Often the human cannot analyze the data fast enough to make adequate decisions. Expert systems can be used to monitor these complex systems and support the human in decision making proc- esses. The testing of GPS, INS and Kalman Filter integration involves making decisions based on complex data from several sources. An expert system can fairly easily be developed to support this type of testing. The F-l 6 navigation design is a complex system that incorporates a Global Positioning System (GPS) receiver, both Strapdown and Gimbaled Inertial Navigation System (INS), and a Kaiman filter into the Fire Control Computer (FCC) to obtain highly accurate horizontal and vertical navigation data . GPS user equipment integrated into a host vehicle navigation computer provides a space positioning reference with high accuracy%. The integrated system also provides automatic system altitude calibration. This paper will present the development of an expert system to support the testing of this complex navigation system. For the purposes of this paper we will refer to an Expert System as a computer program that incorporates one or more techniques of artificial intelligence to perform an activity that would be normally performed by a human expert. -The Expert System developed in this paper does not replace the human expert but plays the role of an assistant. The expert system is considered a delivery vehicle for Artificial Intelligence techniques. Expert systems are very complex and require extensive preparation for development. The representation of Knowledge structure is the fundamental tool used in this development and the one chosen for this development was Frames. Expert systems can be used in applications involving diagnosis. prediction. consultation. planning. instruction and interpretation. The expert system developed for F-16 testing was designed to be used for all these purposes but is limited in the scope of the information base. The F-16 Expert system was dEveloped to support Avionics integration testing. The purpose of the system is to provide engineers with a tool to help determine Navigation system present mode of operation or anomalies. For example the engineer would be able to consult the tool to determine if a sensor such as GPS , is providing proper data to the FCC. The expert system would also give the engineer guidance to areas that would cause anomalies in the navigation system.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	257 - 264
Cite this article:	Henkel, David, "Developing and Expert System to Support GPS Integration," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 257-264.
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