摘要
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。
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 angle,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 avoids 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.
出处
《激光与红外》
CAS
CSCD
北大核心
2014年第12期1374-1378,共5页
Laser & Infrared
基金
国家自然科学基金项目(No.61372166)资助
关键词
电路与系统
横向定标
ISAR像
弹道目标
角度估计
向量
circuits and systems
cross-range scaling
ISAR image
ballistic target
angle estimation
vector
