UWB SAR非均匀区域目标检测方法

在超宽带合成孔径雷达(UWB SAR)图像目标检测中不仅会遇到均匀杂波区域，还会遇到叶簇区域、空旷区域及干扰目标等组成的非均匀杂波区域。恒虚警率(CFAR)目标检测是雷达目标检测的重要方法，而传统的CFAR检测对UWB SAR非均匀杂波区域目标检测效果较差。首先分析了叶簇区域、空旷区域及二者混合区域的杂波分布。然后针对UWB SAR的实际情况，运用智能索引变量的CFAR检测技术(VI—CFAR)，使得均匀杂波和非均匀杂波背景中目标检测都取得了较好的效果。最后，利用实际UWB SAR目标检测结果验证了VI—CFAR的有效性。

UWB SAR Target Detection in Nonhomogenous Environment

Targets in UWB SAR images are commonly located in homogenous or nonhomogenous environment composed of foliage and nonfoliage regions. Constant False Alarm Rate (CFAR) detector is widely used in radar target detection, but traditional CFAR detector fails in nonhomogenous environment. In this paper, we analyze first the features of clutter in regions with foliage, without foliage and their combination. Then a Variability Index (VI) CFAR detector is proposed to provide robust and higher performance in homogenous and nonhomogenous clutter environment. Real UWB SAR target detection results verified the efficiency of the VI CFAR detectors.