解运动目标径向速度模糊的一种新方法  

New method for solving the ambiguity of the radial velocity of a moving target

作　　者：杨垒[1] 王彤[1] 保铮[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2009年第2期189-192,共4页Journal of Xidian University

基　　金：国家部委预研基金项目资助(9140A07050806DZ01)

摘　　要：采用多天线合成孔径雷达可以对运动目标进行检测和测速.为获得好的检测性能,基线长度应该比较长,但在这种情况下会出现测速的速度模糊问题.研究多天线SAR-GMTI系统在估计较大径向速度时的解模糊方法,从理论上分析推导了运动目标干涉相位与雷达系统参数的关系,揭示了基线长度和载波波长改变系统速度响应的机理,提出了一种新的SAR-GMTI速度解模糊方法.本方法同时利用了参差基线和参差频率的解模糊能力,比常规单参差方法解模糊能力更强.同时,提出一种数值计算方法可以简单有效地计算出目标不模糊径向速度.理论分析及计算机仿真验证了本方法的有效性.To obtain good performance for detecting a moving target,the multi-channel SAR system always utilizes a long baseline.However,the radial velocity calculated by the interferometric phase presents ambiguous solutions.A radial velocity unwrapping method for a multi-channel SAR-GMTI system has been proposed in this paper.Based on the analysis of the relationship between interferometric phase of the mover and radar system parameters,the principle that the system velocity response can be altered by the variation of the wavelength and length of the baseline is revealed.The new method utilizes both the multi-baseline and multi-frequency to unwrap the radial velocity and performs better than the routine method.Synchronously,a numerical method is proposed for computing the precise radial velocity of the mover simply but effectively.Analysis and computer simulation demonstrates the validity of the method.

关 键 词：合成孔径雷达(SAR) 地面运动目标检测(GMTI) 速度模糊 

分 类 号：TN957[电子电信—信号与信息处理]