一种抑制SAR图像中动目标干扰的方法

发布时间：2018-01-26 01:16

本文关键词： 高分辨率宽测绘带合成孔径雷达 Deramp 空时自适应处理方法动态导向矢量　出处：《西安电子科技大学学报》2017年02期 　论文类型：期刊论文

【摘要】：在高分辨率宽测绘带合成孔径雷达系统中,用传统的静止场景成像方法对存在动目标的回波数据进行成像,动目标在得到的合成孔径雷达图像中是散焦的,并且动目标会聚焦到错误的位置,同时,散焦的动目标会掩盖原本的合成孔径雷达场景.利用传统的空时自适应处理方法对合成孔径雷达图像中散焦的动目标进行抑制时,所需的空间自由度为场景中动目标的个数与脉冲重复频率欠采样数的乘积,这在实际中很难得到满足.为解决这一问题,提出了一种基于方位Deramp处理的空时自适应处理方法.该方法首先对合成孔径雷达回波数据进行方位Deramp处理,使得动目标在空时平面中是粗聚焦的,此时,抑制合成孔径雷达图像中的一个动目标只需要一个空间自由度.当合成孔径雷达图像中存在多个动目标时,提出了动态导向矢量的概念,它能有效地减少抑制合成孔径雷达图像中散焦动目标所需的空间自由度数目.
[Abstract]:In the high-resolution wide-band synthetic aperture radar (SAR) system, the traditional still scene imaging method is used to image the echo data with moving target, which is defocused in the obtained SAR image. And moving the target will focus in the wrong place, at the same time. The defocused moving target will cover up the original SAR scene. The traditional space-time adaptive processing method is used to suppress the defocused moving target in the SAR image. The required spatial degree of freedom is the product of the number of moving targets in the scene and the under-sampling number of pulse repetition frequency, which is difficult to satisfy in practice. An adaptive space-time processing method based on azimuth Deramp processing is proposed. Firstly, azimuth Deramp processing is applied to SAR echo data. The moving target is coarsely focused in the space-time plane. In this case, only one spatial degree of freedom is needed to suppress a moving target in the SAR image. When there are multiple moving targets in the SAR image. The concept of dynamic steering vector is proposed, which can effectively reduce the number of spatial degrees of freedom required to suppress defocusing targets in synthetic aperture radar (SAR) images.
【作者单位】：西安电子科技大学雷达信号处理国家重点实验室;西安电子科技大学信息感知技术协同创新中心;
【基金】：国家自然科学基金资助项目(61301292) 空间测控通信创新探索基金资助项目(201509A)
【分类号】：TN957.52
【正文快照】： 分辨率和测绘带宽是衡量合成孔径雷达(Synthetic Aperture Radar,SAR)系统性能优劣的两个重要指标.受传统的单通道合成孔径雷达存在最小天线面积的限制,两者往往不可兼得[1].为解决这一矛盾,高分辨率宽测绘带(High-Resolution Wide-Swath,HRWS)合成孔径雷达成像模式被提出[2-3

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