动目标合成孔径雷达成像中的多普勒斜率匹配滤波
Moving Target Focusing by Doppler Slope Filters
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摘要: 该文提出一种多普勒斜率匹配滤波方法，用于解决SAR对运动目标成像中目标回波调频率变化引起的方位散焦问题。该方法通过CFAR预检测和迭代运算解决了多普勒斜率估计精度与多普勒斜率滤波器组运算量间的矛盾，有利于实时处理动目标成像和辨识。通过对运动目标回波特点和真实运动目标的成像分析证明了这一方法的可行性。
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关键词:
- 合成孔径雷达;运动目标;多普勒斜率估计
Abstract: This paper presents a new SAR Doppler slope filters method for detecting the cross range velocity of moving target. This method builds the Doppler slope filter group recursively and reduces the amount of operations. By analysis on the detection precision and range of target speed, the advantage and the limit of this method are indicated. The detection results from real data demonstrate the accuracy of the conclusion. -
Curlander J, McDnough R. Synthetic Aperture Radar System and Signal Processing, New York: Wiley, 1991, chapter 1, 2.[2]张澄波, 综合孔径雷达原理、系统分析与应用, 北京: 科学出版社, 1989, 第四章.[3]Freeman A, Currie A. Synthetic aperture radar (SAR) images of moving targets. GEC Journal of Research, 1987, 5(2): 106-115.[4]DAddio E, Di Bisceglie M, Bottalico S. Detection of moving objects with airborne SAR[J].Signal Processing.1994, 36(2):149-162[5]Hern-Chung Chen, Clare D, McGillem. Target motion compensation by spectrum shifting in synthetic aperture radar. IEEE Trans. on AES , 1992, 28(3): 895-901.[6]李杰, 向敬成, 黄顺吉. 合成孔径雷达慢运动目标成像处理的研究. 电子科技大学学报, 1995, 24(2) : 119 -125. -
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