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SAR成像中一种改进的最小熵多普勒调频率估计算法 被引量:2

An Improved Estimation Algorithm of Minimum Entropy Doppler Frequency Modulation Ratio in SAR Image
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摘要 多普勒调频率是SAR高分辨成像中的重要参数。当波束宽度较窄时,最小熵法可以获得较好的效果。但在搜索最优多普勒调频率时,每搜索一次都要对整个数据矩阵进行方位压缩并求熵,计算量较大。本文提出了一种将距离压缩后的数据矩阵按照聚焦深度分块搜索最优多普勒调频率的方法,分别从降低计算量和提高不同距离单元多普勒调频率精度两个方面对该方法进行讨论。实测数据及仿真数据的成像结果证明了此方法的可行性。 The paper pints out a method of making data array, after the range compression, to sectionally search the optimum Doppler frequency modulation ratio according to the focus depth. And it also discusses the method from two aspects: lowing down the calculation value and enhancing the accuracy of Doppler frequency modulation ratio in different range units. The image results of the actual testing data and the simulation data verify the feasibility of the method.
出处 《火控雷达技术》 2005年第2期21-24,共4页 Fire Control Radar Technology
关键词 合成孔径雷达 多普勒调频率 聚焦深度 最小熵法 SAR radar Doppler frequency modulation ratio focus depth entropy
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