一种用于月面着陆的知识辅助单脉冲前视成像方法  

A Knowledge Aided Monopulse Forward-looking Imaging Algorithm for Lunar Landing

作　　者：陈洪猛[1] 鲁耀兵[1] 刘京[1] 孙晗伟[1] 易晓丽[1] 穆贺强[1] CHEN Hongmeng;LU Yaobing;LIU Jing;SUN Hanwei;YI Xiaoli;MU Heqiang(Beijing Institute of Radio Measurement, Beijing 100854, China)

机构地区：[1]北京无线电测量研究所,北京100854

出　　处：《载人航天》2019年第1期31-36,共6页Manned Spaceflight

基　　金：中国博士后基金(2017M610966)

摘　　要：针对月面着陆过程中可能存在的着陆器倾斜而导致的结构损坏甚至颠覆等问题,提出了一种用于月面着陆的基于知识辅助的单脉冲前视成像方法。首先结合月面着陆器平台搭载的双通道雷达进行了理想情况下的单脉冲成像分析,然后分析了影响单脉冲成像性能的内在机理,并对雷达接收通道的不一致性进行了建模。在此基础上,将单脉冲成像问题转化为通道相位误差估计问题;结合天线方向图的先验信息,通过对实际天线方向图与理想方向图数据信息的对比,利用最小二乘方法估计出两者之间的相位差异,并求得改进的单脉冲测角曲线。最后对接收到的回波数据进行相位补偿,就可以获得高分辨的月面着陆区域单脉冲成像结果。地球机载实测数据处理结果表明此方法可以获得高分辨的前视成像结果,可应用在月面着陆过程中。To solve the problem of structure damage or overturn caused by lander’s slant landing,an efficient knowledge aided monopulse forward-looking imaging algorithm for lunar landing was put forward.First,the ideal monopulse imaging method based on two-channel radar was analyzed.Then the reason for poor azimuth performance was analyzed and the channel error model was constructed.On this basis,the problem of monopulse imaging was converted into the problem of channel phase estimation.The least square(LS)method was utilized to estimate the phase error by exploiting the real antenna pattern information and a modified monopulse curve(MPC)was obtained.In the end,the high resolution lunar landing terrain was achieved with the modified MPC after phase compensa-tion.Real data demonstrated that high azimuth resolution forward-looking image could be acquired by the proposed algorithm.It can be used in lunar landing.

关 键 词：月面着陆 前视雷达 单脉冲成像 知识辅助 

分 类 号：V19[航空宇航科学与技术—人机与环境工程]