The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Analysis of Anti-Jamming Techniques for Satellite Navigation Systems

위성항법시스템을 위한 항재밍 기술 분석

  • Received : 2013.09.13
  • Accepted : 2013.12.11
  • Published : 2013.12.31
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Abstract

GNSS(Global Navigation Satellite System) is now being widely used in both civilian and military applications where accurate positioning and timing information are required and it is considered as a representative convergence technique in IT-Military application techniques. However, GNSS has low sensitivity level of GNSS receivers and is vulnerable to jamming signal, since the signals come from the satellite located at approximately 20,000 Km above the earth. The studies for the anti-jamming techniques in military applications have been passively performed in the domestic, because the information related GNSS are dependent on the countries that have GNSS. In this paper, we show the effect of jammer ERP by analyzing the link budget of GPS J/S power as a function of distance between jammer and receiver. Also, we categorize the anti-jamming techniques based on the functional block diagram of GNSS receiver structure and analyze the recent anti-jamming GNSS products and their technologies developed in domestic and foreign countries.

위성항법시스템은 현재 민간과 군에게 위치와 시간 정보를 제공하는 유용한 시스템으로 널리 활용되고 있으며, 국방-IT 간 대표적 융합 기술로 거론되고 있다. 그러나 위성항법시스템은 지구로부터 2만 Km 상공의 원거리에서 신호를 송신하므로 위성항법 수신기의 수신 감도가 매우 미약하여, 재밍(jamming) 공격에 취약한 특성을 가진다. 이와 같은 위성항법시스템을 위한 항재밍(anti-jamming) 기술에 관한 연구는 위성항법시스템을 소유한 국가가 공개하는 기술적 정보에 의존적이어서 국내 국방 분야에서는 소극적 수준의 연구에 머물러 있다. 본 논문에서는 먼저 위성항법시스템의 다양한 재밍원 소개와 J/S와 재머-수신기 간의 거리 링크 버짓 분석을 통한 위성항법시스템의 재밍 취약성을 분석하였다. 또한 위성항법시스템 수신기 설계에 적용 가능한 항재밍 기술을 분류하고 분석하였으며, 최근 연구되고 있는 국내외 항재밍 관련 제품 및 기술을 분석하였다.

Keywords

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