Multipath Error Mitigation using Differenced Autocorrelation Function

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Journal of the Korea Institute of Military Science and Technology 2003;6(1):59-67.

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자기 상관 차분 함수를 이용한 다중 경로 오차 감쇄 기법

최일흥, 이상정

¹충남대학교 전자공학과 대학원, ㈜네비콤
²충남대학교 정보통신공학부

Abstract

Multipath is an inevitable error source in radio navigation system such as GPS, it causes signal tracking errors such as carrier tracking errors, code tracking errors. Since code tracking error is a dominant error in absolute positioning, this paper focuses on the improvement of code tracking performance. This paper proposes a method that detects the change of autocorrelation function's slope and mitigates the multipath error. Also, this paper shows the performance evaluation results by post-processing the digitized RF samples.

Key Words: GPS, Multipath, Autocorrelation Function