雷达高度表回波模拟及扩展目标算法  

Research on Echo Signatures and Detection Algorithm of Extended Target for Radar Altimeter

作　　者：杨菲[1] 江舸[1] 肖汉波[1] YANG Fei;JIANG Ge;XIAO Hanbo(Institute of Electronic Engineering,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621999

出　　处：《雷达科学与技术》2018年第5期567-572,共6页Radar Science and Technology

摘　　要：雷达高度表回波信号具有时域和多普勒域二维展宽特性,将该特性作为目标检测器的先验信息是提高弹载雷达高度表检测性能的重要方法之一。将目标回波看作是若干个散射点回波信号的矢量合成,并考虑载体高速运动对各个散射点回波信号的多普勒调制,提高了目标回波仿真的可信度。仿真模拟了不同地形地貌、不同高度条件下的回波信号,分析了目标回波在时域和多普勒域的展宽及起伏特性。通过在时频域对目标散射点二维分布的估计,设计了一种适用于弹载雷达高度表的改进BS-GLRT检测算法。仿真表明,该检测算法的性能优于现有的检测算法。The terrain detected by radar altimeter is a range-spread and Doppler-spread target.In order to improve the detection performance of radar altimeter,the detection algorithm partially using the information of the target is gradually becoming the research issue.A high reliable simulation method is presented to get the radar echo.Then,the backscattering and emission signatures of radar echo in time and Doppler domains are analyzed.Finally,a double-threshold detector based on scatter distribution and BS-GLRT is proposed.The performance assessment confirms that the newly-proposed detection algorithm outperforms the previous algorithms.

关 键 词：雷达高度表 扩展目标 散射中心 回波模拟 目标检测 

分 类 号：TN957.51[电子电信—信号与信息处理]