Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Frequency Domain Partially Adaptive Array Algorithm Combined with CFAR Technique

CFAR 검파기법을 이용한 주파수 영역 부분적응 어레이 알고리듬

  • Mun, Seong-Hun (School of Electronic & Electrical Engineering, Kyungpook National University) ;
  • Han, Dong-Seok (School of Electronic & Electrical Engineering, Kyungpook National University)
  • 문성훈 (경북대학교 전자전기공학부) ;
  • 한동석 (경북대학교 전자전기공학부)
  • Published : 2001.03.01
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Abstract

This paper proposes a frequency-domain partially adaptive algorithm, called a censoring algorithm, to reduce the computational complexity of the frequency domain adaptive array. The proposed censoring algorithm determines the existence of interferences in the frequency-domain at each frequency bin using a constant false alarm rate (CFAR) processor. The censoring algorithm adapts only those parts of the weights that correspond to the frequency bins expected to contain interferences. The censoring algorithm is also expanded to overcome the signal cancellation phenomenon caused by smart jammers. Accordingly, a censoring spatial smoothing, which combines the censoring algorithm with spatial smoothing, is proposed. Simulation results show that the proposed algorithms are effective in removing interferences with only part of the computational complexity of conventional algorithms yet with the same level of performance.

본 논문에서는 주파수 영역 적응 어레이의 계산량을 감소시키기 위한 주파수 영역 부분적응 어레이 알고리듬인 센서링(censoring) 알고리듬을 제안하고, 이를 공간평활(spatial smoothing) 기법과 결합하여 공간평활로 인한 계산량 문제를 해결할 수 있는 센서링 공간평활 알고리듬을 제안한다. 제안한 센서링 알고리듬은 CFAR(constant false alarm rate) 검파기법을 이용하여 각 주파수 대역에 간섭신호가 있는지를 판단하고 간섭신호가 있는 주파수 대역의 해당 가중치에 대해서만 적응 알고리듬을 적용한다. 모의실험을 통하여 제안한 알고리듬을 사용한 GSC(generalized sidelobe canceller)가 기존의 주파수 영역 LMS(least mean square) 알고리듬을 사용한 GSC에 비하여 크게 줄어든 계산량으로 빠르게 간섭신호를 제거함을 확인하였다.

Keywords

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