UWB SAR非均匀区域目标检测方法  

UWB SAR Target Detection in Nonhomogenous Environment

作　　者：王红岗[1] 黄晓涛[1] 金添[1] 

机构地区：[1]国防科技大学电子与工程学院

出　　处：《现代雷达》2005年第7期35-38,共4页Modern Radar

摘　　要：在超宽带合成孔径雷达(UWBSAR)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UWBSAR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UWBSAR的实际情况,运用智能索引变量的CFAR检测技术(VICFAR),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UWBSAR目标检测结果验证了VICFAR的有效性。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.

关 键 词：超宽带合成孔径雷达 恒虚警率目标检测 非均匀杂波 索引变量 

分 类 号：TN958[电子电信—信号与信息处理] TN957[电子电信—信息与通信工程]