星载双站SAR运动目标加速度检测和估计  

Moving target acceleration indicaion and estimation for space-borne bistatic synthetic aperture radar

作　　者：齐维孔[1,2] 禹卫东[1] 黄平平[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《系统工程与电子技术》2010年第5期946-950,共5页Systems Engineering and Electronics

摘　　要：星载合成孔径雷达(synthetic aperture radar,SAR)用于动目标检测和参数估计时,忽略动目标加速度的影响将会导致沿航迹速度估计的较大误差。给出了星载双站合成孔径雷达检测和估计地面运动目标加速度的算法,该算法主要利用运动目标相对于工作在Tandem模式下的星载双站SAR具有不同相对径向速度的原理,利用三孔径星载SAR估计径向速度的算法,估计出相对于星载双站SAR的不同径向速度。根据这两个径向速度和SAR视角之间的关系,计算出动目标运动方向和常数项切向速度,最后根据估计的调频斜率计算出切向加速度和径向加速度。仿真结果表明,该算法能正确地估计出具有加速度的动目标速度参数。The neglect of across-track accelerations can lead to the erroneous estimation of along-track velocities when a space-borne SAR is used to detect moving targets and estimate their motion parameters.The algorithm of detecting and estimating the accelerations of moving targets for space-borne bistatic SAR is addressed,which mainly uses the principle that moving targets relative to space-borne bistatic SAR in Tandem mode have different radial velocities.Different radial velocities are estimated by using the algorithm of three apertures SAR estimation radial velocities of moving targets.Then,the directions and constant tangential velocities are calculated according to the relationship of the squint angle and both radial velocities.Finally,the radial and tangential accelerations are obtained by the estimation of Doppler rate.Simulation result demonstrates that the algorithm can effectively estimate the velocity parameters of moving targets with acceleration.

关 键 词：星载双站合成孔径雷达 Tandem模式 动目标检测 加速度 

分 类 号：TN95[电子电信—信号与信息处理]