基于自适应Chirplet分解的非均匀转动目标ISAR相位聚焦  

ISAR Phase Focusing for Nonuniform Rotating Target Based on Adaptive Chirplet Decomposition

作　　者：蔡洪[1] 何强[2] 赵春宇[1] 

机构地区：[1]中国白城兵器试验中心,吉林白城137001 [2]军械工程学院光学与电子工程系,石家庄050003

出　　处：《电光与控制》2013年第6期79-84,共6页Electronics Optics & Control

摘　　要：在ISAR成像中,由非均匀转动引起的相位误差与散射点的径向位置有关,传统的相位聚焦方法难以采用统一的相位校正函数来进行补偿。针对此问题,提出一种基于自适应Gaussian包络Chirplet分解(AGCD)快速算法的相位补偿方法。该方法在任意选取的距离单元上,利用Gaussian包络Chirplet分解得到两个较强散射点所对应的线性调频信号参数,并结合多特显点处理(PPP)模型,对由平动和非均匀转动造成的相位误差分别进行补偿。该方法计算量小,估计精度高,且没有孤立强散射点的要求。仿真实验结果表明了它的有效性。In ISAR imaging, the phase error caused by nonuniform rotation is relevant to the radial position of scatterers, so it is difficult for us to use traditional phase focusing algorithms to complete the phase compensation, in which the uniform phase correction function is applied. In order to solve the problem, we put forward a phase compensation method based on adaptive Gaussian Chirplet decomposition （AGCD） fast algorithm. In this method, the linear frequency modulation （LFM） signal parameters of two stronger scatterers in random range bin are obtained via AGCD algorithm, and then the multiple prominent point processing （PPP） model is implemented to eliminate the phase error caused by translational motion and nonuniform rotation. This method has the advantages of low computation cost and high accuracy, and it doesn＇t require the scatterer be well isolated. The numerical simulation proves its good efficiency.

关 键 词：逆合成孔径雷达 相位聚焦 自适应Gaussian包络Chirplet分解 非均匀转动 

分 类 号：V271.4[航空宇航科学与技术—飞行器设计] TN959.3[电子电信—信号与信息处理]