Journal of Advanced Navigation Technology (한국항행학회논문지)

The Korean Navigation Institute (한국항행학회)
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The Spectral Domain K-median Threshold Filtering Method for the Dynamic GPS Interference Excision

동적 GPS 간섭신호 제거에 효율적인 주파수 영역에서의 K-median 필터를 이용한 문턱치 설정 기법

  • Kim, Jun O (Agency for Defence Development, Navigation Division) ;
  • Lee, Sang Jeong (Department of Electronics Engineering, Chungnam National University)
  • Received : 2017.03.22
  • Accepted : 2017.06.05
  • Published : 2017.06.30
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Abstract

GPS(Global Positioning System) signal structure uses spread spectrum and the received power is relatively lower than the receiver noise figure. Therefore, it is vulnerable to the RF interferences and it could restrict on the safety navigation. The objective of this paper is to research on the spectral domain GPS interference rejection algorithm using proposed K-median filtering threshold setting method. In the performance test, the proposed algorithm has a relatively higher ISR(interference to signal ratio) compared with the conventional temporal domain technique in case of time variant interference signals.

GPS 신호체계는 대역확산 방식을 사용하며, 신호의 크기는 시스템 잡음수준 이하이므로 외부 전파 간섭신호에 매우 취약하며, 이는 GPS를 이용하는 선박 또는 항공기 에 대한 안전 운항을 제한 할 수 있다. 본 논문은 이러한 GPS 간섭 신호 제거를 위한 K-median 방식의 문턱치 설정 방식을 적용한 주파수 영역의 신호 처리 기법을 제안하며, 이는 기존에 보편적으로 사용되는 시간 영역에서의 간섭신호 제거 방식보다, 시간에 따른 신호 변화가 큰 간섭신호를 인가한 조건에 대해서 상대적으로 우수한 성능을 가짐을 확인하였다.

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References

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