基于小波变换的合成孔径雷达运动目标多普勒参数提取算法
DOPPLER PARAMETER EXTRACTION OF MOVING TARGETS IN SAR IMAGING BY WAVELET TRANSFORM
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摘要: 本文基于合成孔径雷达成象处理中运动目标回波信号的频谱特点以及WVD变换的性质,讨论了WVD的双线性特性在用于运动目标多普勒参数提取,特别是用于多点目标及面目标成象处理时的缺陷,并结合小波变换特点,分析了小波变换用于运动目标多普勒参数提取的可行性和用于多点目标和面目标情况下的内在优势,在此基础上提出了基于小波变换的合成孔径雷达运动目标多普勒参数提取算法,计算机仿真结果验证了算法的可行性。Abstract: In this paper, the shortages of WVD s double-linearity in extracting the Doppler parameters of moving-targets are discussed, especially in multi-point moving-targets imaging processing based on the spectrum characteristics of moving-target echo signals in Synthetic Aperture Radar (SAR) imaging processing and the properties of WVD. Combined with the characteristics of Continuous Wavelet Transform (CWT), the responsibility and advantages of CWT in multi-point moving-target Doppler parameters extraction are analyzed. Finally a kind of multi-point moving- target Doppler parameters extracting algorithm based on CWT are developed, and the computer stimulating results demonstrate the correctness of the algorithm.
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Barbarossa S, Rarina A. Detection and Imaging of moving objects with SAR, Part 2: Joint Time-[2]Frequency Analysis by Wigner-Ville Distribution. IEE Proc.-F 1992, 139(1): 79-97.[3]王韬.合成孔径雷达运动目标成象算法研究:[硕士论文].中国科学院电子学研究所,1995.[4]何峻湘.WVD用于SAR运动目标检测和成象的参数估计.电子科学学刊,1995, 17(6): 585-590. -
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