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电子学报  2015 

一种利用目标微动特性提高SAR-MMTI检测性能的方法

DOI: 10.3969/j.issn.0372-2112.2015.06.002, PP. 1050-1057

Keywords: 多通道,微动,鬼影点,干涉相位,空域导向矢量,杂波抑制

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Abstract:

地面运动目标除具有匀速、匀加速等平动的运动形式外,还可能存在如摆动,振动,旋转等周期性的微动形式,而传统的二阶距离近似模型不能准确描述微动目标的斜距历程.本文通过建立多通道合成孔径雷达地面微动目标几何模型,借助成对回波理论与SAR成像算法,推导出了微动目标图像域回波的矢量表达式,分析了微动导致的单通道方位散焦及其对通道间干涉相位的影响.设立回波的鬼影点的归一化幅度及鬼影点空域导向矢量与杂波空域导向矢量间相关系数这两个性能指标,仿真验证了在较强杂波环境中,利用鬼影点对地面运动目标进行检测仍具有良好的改善因子性能.

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