地面运动目标不模糊径向速度估计的方法  

Unambiguous Radial Velocity Estimation Method of Ground 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国家重点实验室,西安710071

出　　处：《西安交通大学学报》2009年第8期76-79,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(60872140)

摘　　要：针对在多通道合成孔径雷达地面运动目标检测系统中采用常规测速方法估计运动目标径向速度时产生模糊的问题,提出了一种联合斜距历程和干涉相位的不模糊速度估计方法(JRHIP).首先利用多重信号分类算法对目标的距离频域数据进行超分辨处理,然后对目标与雷达之间的斜距历程进行多项式拟合,利用斜距历程多项式一次项系数与目标径向速度的对应关系得到不模糊、精度略低的径向速度,再求解干涉相位的2π模糊次数,然后通过解模糊后的目标干涉相位得出正确的径向速度.JRHIP方法充分利用了斜距历程测速的不模糊性和干涉相位测速的高灵敏性,且没有增加系统硬件的复杂度.实测数据处理结果表明,在目标径向速度较大导致干涉相位产生模糊时,JRHIP方法仍然能够得到准确的径向速度,进而完成对目标的正确定位.Aiming at the radial velocity ambiguity of moving targets in conventional multi-channel synthetic aperture radar （SAR） ground moving target indication system, a new unambiguous radial velocity estimation method （JRHIP） is proposed. The method joints the range history with the interferometric phase. The multiple signal classification algorithm is used to improve the range resolution of the target image. And a unambiguous velocity with slightly low precision is obtained from the coefficient of the first order term in the polynomial that fits the range history of the target, and then is used to solve the interferometric phase ambiguity times. Then the true radial velocity is estimated by the interferometrie phase with the known ambiguity time. The method combines the unambiguous characteristic of terferometric phase, and does not increase any the range history and the high sensitivity of the inhardware complexity of the system. Experimental results on airborne SAR data process indicate that the method can obtain the true radial velocity and relocate the moving target with large radial velocity.

关 键 词：合成孔径雷达 地面运动目标检测 干涉相位 斜距历程 

分 类 号：TN957[电子电信—信号与信息处理]