空间碎片的低分辨雷达二维成像及其运动补偿算法  

A 2D Low-Resolution Radar Imaging and Motion Compensation method of Space Debris

作　　者：唐辉[1] 宋正鑫[1] 胡卫东[1] 郁文贤[1] 

机构地区：[1]国防科技大学ATR重点实验室,湖南长沙410073

出　　处：《信号处理》2007年第5期718-721,共4页Journal of Signal Processing

基　　金：国家高技术研究发展计划(863计划)课题(No.2003AA134030)

摘　　要：地基雷达一直是空间碎片监测的强有力工具,现有的雷达数据处理方法的缺陷逐渐显现,需要新的方法以应对空间环境的日益恶化。本文针对空间碎片特有的运动特征和物理特征,给出了一种利用低分辨雷达获取小尺寸空间碎片二维雷达成像的方法。该方法通过对目标的窄带雷达回信号的相干积累得到目标的瞬时一维横向像,然后将一维横向像序列按照转动角度重排,最后利用各散射点横向距离投影的正弦变化特征,在过距离零点的圆上进行幅度非相干积累获得目标二维图像。分析了目标平动对成像的影响,并给出了基于最小熵准则的运动补偿算法,点目标的仿真结果验证了成像算法和运动补偿算法的有效性。Ground-based radar is a powerful tool for space debris observation, but those old methods for radar data processing will not meet the needs of observation requirements. In virtue of its own motion and shape features, a 2D low-resolution radar imaging method of small space debris is proposed in this paper. This method employs the time-frequency analysis technique to obtain the instantaneous cross-range profiles of the target by the coherent integration, and secondly rearranges the cross-range profile series according to aspect angles to acquire the cross range-aspect angle distribution, and thirdly reassigns each point＇s power in the cross range-aspect angle distribution to gain the target image. Furthermore, the effects of the reference center＇ s translational motion relative to radar on imaging are analyzed ,and a corresponding motion compensation algorithm, based on minimizing image entropy, is presented. Finally, simulation results of the point target illuminate the validity of the above methods.

关 键 词：空间碎片 雷达成像 横向像 运动补偿 最小熵 

分 类 号：TN919.8[电子电信—通信与信息系统]