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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Interference Mitigation by High-Resolution Frequency Estimation Method for Automotive Radar Systems

고해상도 주파수 추정 기법을 통한 차량용 레이더 시스템의 간섭 완화에 관한 연구

  • Lee, Han-Byul (Institute of New Media and Communications, Dept. of Electrical and Computer Engineering, Seoul National University) ;
  • Choi, Jung-Hwan (Institute of New Media and Communications, Dept. of Electrical and Computer Engineering, Seoul National University) ;
  • Lee, Jong-Ho (Dept. of Electrical Engineering, Gachon University) ;
  • Kim, Yong-Hwa (Dept. of Electrical Engineering, Myunggi University) ;
  • Kim, YoungJoon (Institute of New Media and Communications, Dept. of Electrical and Computer Engineering, Seoul National University) ;
  • Kim, Seong-Cheol (Institute of New Media and Communications, Dept. of Electrical and Computer Engineering, Seoul National University)
  • Received : 2015.12.03
  • Accepted : 2016.02.02
  • Published : 2016.02.29
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Abstract

With the increased demand for automotive radar systems, mutual interference between vehicles has become a crucial issue that must be resolved to ensure better automotive safety. Mutual interference between frequency modulated continuous waveform (FMCW) radar system appears in the form of increased noise levels in the frequency domain and results in a failure to separate the target object from interferers. The traditional fast fourier transform (FFT) algorithm, which is used to estimate the beat frequency, is vulnerable in interference-limited automotive radar environments. In order to overcome this drawback, we propose a high-resolution frequency estimation technique for use in interference environments. To verify the performance of the proposed algorithms, a 77GHz FMCW radar system is considered. The proposed method employs a high-resolution algorithm, specially the multiple signal classification and estimation of signal parameters via rotational invariance techniques, which are able to estimate beat frequency accurately.

차량용 레이더 시스템에 대한 수요가 증가함에 따라서, 상호 간섭 문제는 차량 안전을 보장하기 위해 해결해야 할 결정적인 이슈가 되었다. Frequency modulated continuous wave(FMCW) 레이더의 상호 간섭은 잡음 전력 증가의 형태로 나타나며, 이는 간섭체로 인한 타겟 검출의 실패로 이어진다. 기존의 FMCW 레이더의 주파수 추정을 위하여 사용되는 fast Fourier transform (FFT) 기법은 차량용 레이더 간섭 환경에서는 취약하다. 이러한 단점을 극복하기 위하여, 본 연구에서는 간섭환경에서 사용하기 위한 고해상도 주파수 추정 기법을 제안한다. 제안된 알고리즘의 성능을 입증하기 위하여, 77GHz 전방 감시용FMCW 레이더 시스템을 도입하였다. 제안된 기법은 간섭환경에서도 정확하게 주파수를 추정할 수 있는 multiple signal classification, estimation of signal parameters via rotational invariance techniques과 같은 고해상도 알고리즘을 이용한다. 실험결과로부터 제안된 알고리즘이 기존의 FFT 알고리즘에 비해 신호 대 간섭비 측면에서 14 dB 이상의 마진을 가짐을 확인하였다.

Keywords

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