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An analysis of the moving speed effect of the receiver array on the passive synthetic aperture signal processing

수동형 합성개구 신호처리에서 수신 배열 센서의 이동 속도에 대한 영향 분석

Kim, Sea-Moon;Byun, Sung-Hoon;Oh, Sehyun
김시문;변성훈;오세현

  • Received : 2016.10.05
  • Accepted : 2015.12.18
  • Published : 2016.03.31

Abstract

In order to obtain high-resolution seafloor images, research on SA (Synthetic Aperture) processing and the development of related underwater systems have been performed in many countries. Recently the SA processing is also recognized as an important technique in Korea and researchers started related basic study. However, most previous studies ignored the Doppler effect by a moving receiver array. In this paper reconstructed SAS (Synthetic Aperture Sonar) images and position errors are analyzed according to the speed of a moving array for understanding its moving effect on the SAS images. In the analysis the spatial frequency domain interpolation algorithm is used. The results show that as the moving speed of the array increases the estimated position error also increases and image distortion gets worse when we do not consider the array motion. However, if the compensated receiver signals considering the array motion are used the position error and image distortion can be eliminated. In conclusion a signal processing scheme which compensates the Doppler effect is necessary especially in the condition where the array speed is over 1 m/s.

Keywords

Synthetic aperture signal processing;Spatial frequency domain interpolation;Receiver array moving speed;Doppler effect;Estimated source position error

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Acknowledgement

Grant : 기관목적사업

Supported by : 한국해양과학기술원 부설 선박해양플랜트연구소