한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

  • 제23권1호
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  • Pages.56-67
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  • 2012
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  • 1226-3133(pISSN)
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  • 2288-226X(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
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최소 자승법을 이용한 고해상도 밀리미터파 탐색기의 비선형 위상 오차의 추정

Sweep Nonlinearity Estimation for High Range Resolution Millimeter-Wave Seeker Using Least Squares Method

  • 양희성 (한국과학기술원 전기 및 전자공학과) ;
  • 전주환 (한국과학기술원 전기 및 전자공학과) ;
  • 송성찬 (삼성탈레스(주))
  • 투고 : 2011.10.31
  • 심사 : 2012.01.04
  • 발행 : 2012.01.31
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초록

본 논문 연구에서는 고해상도 레이더 탐색기에 쓰이는 FMICW(Frequency Modulated Interrupted Continuous Wave) 또는 FMCW(Frequency Modulated Continuous Wave) 시스템의 비선형 특성에 의해서 발생되는 거리 해상도(range resolution) 성능 저하 현상을 보상하기 위하여, 하드웨어의 비선형 위상 오차 성분을 다양한 진폭, 위상을 가지는 사인함수와 랜덤 성분으로 모델링하고, 이를 추정할 수 있는 신호 처리 알고리즘을 새롭게 제안하였다. 이 방법은 알고 있는 거리에 위치한 두 개의 기준점 목표물(point target)로부터 각각 측정된 두 개의 IF 신호를 연립방정식화하여 희소 선형식(sparse linear equation)을 세우고, 최소 자승법(least squares) 관점에서 최적 해로서의 비선형 오차 성분을 추정하는 방법으로써 추정된 비선형 오차 성분은 비선형 오차 특성 보상을 위한 사전 왜곡(predistortion) 기법을 위해 사용될 수 있다.

In this thesis, to compensate the sweep nonlinearity occurring in the high resolution radar system using FMICW or FMCW, the method of the estimation of the nonlinearity is proposed. The nonlinear phase component caused by the nonlinear characteristic of the radar system is modelled as a linear combination of the sinusoidal functions consisting of various magnitudes and phases(systematic nonlinear phase error) and a random component(stochastic nonlinear phase error). From two IF signals that are measured respectively independently for two reference point targets lying in different distances which are known, a sparse linear equation is made and solved by least squares method to estimate the nonlinear phase component. The estimated component can be used for predistortion method to compensate the sweep nonlinearity.

키워드

참고문헌

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