机载正侧视合成孔径雷达地面运动目标参数估计方法  

An Approach of Ground Moving Target Motion Parameter Estimation for Airborne Sidelooking SAR System

作　　者：朱圣棋[1] 廖桂生[1] 曲毅[1] 周争光[1] 李海[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

出　　处：《电子学报》2010年第12期2757-2762,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60736009);国家杰出青年基金(No.60825104)

摘　　要：针对距离向速度估计中存在的模糊问题,提出一种利用目标距离包络的走动轨迹,通过Radon变换技术来无模糊地估计距离向速度的方法.针对距离向加速度影响方位向速度估计问题,提出了利用目标多普勒参数来估计运动目标真实合成孔径时间,通过真实合成孔径时间与方位向速度的关系来确定目标方位向速度.该方法能很好估计方位向速度而不受距离加速度的影响.所提方法适合于单/多通道系统.仿真和实测数据验证了方法的有效性.A novel algorithm is presented to solve the ambiguity problem of across-track velocity estimation for moving targets in airborne sidelooking SAR system.In this method,the across-track velocity can be unambiguously estimated according to the slope calculated by Radon transform of the profile extracted from the echo＇s range walk trajectory.In order to solve the problem the along-track velocity estimation is influenced by the across-track acceleration,we propose a new along-track velocity estimation approach.The along-track velocity can be obtained by the real synthetic aperture time（synthetic aperture length） of target.Proposed methods can be applied to both single-and multi-channel SAR systems.The validity and practicability are verified by the simulated and real measured data.

关 键 词：合成孔径雷达 地面运动目标指示 RADON变换 速度模糊 参数估计 

分 类 号：TN959.73[电子电信—信号与信息处理]