基于成像序列的弹道目标ISAR图像横向定标

摘要

Cross-range scaling for ISAR image is the basis of target’s structure feature extraction,and the key point is the estimation of its rotate speed.Firstly,the vectors which are composed of target’s scattering points in ISAR image are obtained based on ballistic target’s ISAR sequence.Secondly,the expression is estimated by using the rotate an-gle,and the maximum modulus vectors’rotating angle between ISAR sequence is mapped to target’s rotating angle. Then,the estimation of target’s rotate speed is achieved.At last,the performance of the method is analyzed.This method takes full advantage of the characteristics of ISAR image sequence and target’s feature information,and it a-voids the complex image registration and complicated echo Doppler rate estimation.Simulation results show that the method can estimate target’s rotate speed efficiently and have a low scaling error.%对目标逆合成孔径雷达（Inverse Synthetic Aperture Radar，ISAR）像横向定标是进行目标结构特征提取的基础，重点是进行目标转速的估计。从弹道目标的ISAR像序列出发，得到ISAR像中散射点构成的向量。利用给出的转角估计表达式，考察模值最大的向量在成像序列之间的转角，以此作为目标的转角，完成目标转速的估计。最后对所提方法的性能进行了分析。该方法充分利用ISAR像序列的特点和序列中包含的目标特征信息，避免了繁琐的图像配准过程和复杂的回波多普勒调频率估计。仿真实验表明，该方法能有效完成目标转速估计，定标误差较小。