Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Field Test Results of the Improved GPS Navigation Algorithm

개선된 GPS 항법 알고리듬의 실시간 처리 주행 실험결과

  • Won, J.H. (Dept. of Control & Instrumentation Eng. Ajou Univ.) ;
  • Ko, S.J. (Dept. of Control & Instrumentation Eng. Ajou Univ.) ;
  • Lee, J.S. (School of Electronic Eng. Ajou Univ.)
  • 원종훈 (아주대학교 대학원 제어계측공학과) ;
  • 고선준 (아주대학교 대학원 제어계측공학과) ;
  • 이자성 (아주대학교 전자공학부)
  • Published : 1998.07.20
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Abstract

This paper presents the results of the field of an improved GPS navigation algorithm. The improved GPS navigation algorithm is a modified Kalman filter which is designed to be ideally suited to car navigation in urban area where lack of GPS visibility is the major problem because of the frequent blockage of the GPS signals by tall buildings and other structures. The method allows the user to estimate its position when the number of visible GPS satellites becomes less than four by using altitude fixing and clock bias estimation techniques. The two estimation techniques are integrated with the Kalman filter in a mutually compensating manner and it is shown that the 3-dimensional position accuracy is well maintained when the number of the visible satellites drops down to two for a reasonable period of time. The post processing results are included to show the improved performance of the modified algorithm over a normal conventional GPS Kalman filter.

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