弹头目标的ISAR回波特性分析

针对弹道导弹目标进行逆合成孔径雷达(ISAR)成像问题,对沿轨道高速运动并同时伴有自旋的弹头ISAR回波特性进行了分析.首先建立了弹头目标的运动模型和ISAR回波模型,将弹头的自旋矢量沿雷达视线方向和垂直于雷达视线方向进行分解,然后分别分析了弹头目标的轨道运动和自旋对回波信号的影响,最后进行了仿真分析.理论分析和仿真结果表明:弹头目标沿轨道的高速运动会使目标散射点产生严重的越距离单元徙动,而弹头的自旋会使目标散射点产生严重的越多普勒单元徙动,并使回波多普勒谱展宽,因而这两者都必须进行补偿.

Analysis of ISAR Echo Characteristics of Warhead Targets

This paper aims to the issue of ISAR imaging for the ballistic missile targets and analyzes the ISAR echo characteristics of a warhead that is moving along the trajectory at high speed simultaneously with spinning.First,the motion model of a warhead target and ISAR echo model are established,and the spinning vector of the warhead is decomposed with respect to both the direction of radar’s line of sight and that per-pendicular to the radars’ line of sight.Then,the impacts of trajectory movement and spinning of a warhead on the echo signals are analyzed,and some simulation analysis is performed,finally.Theoretical analysis and simulation results illustrate that the warhead target’s motion along the trajectory at high speed can cause the target’s scattering point to have a serious migration through resolution cell（MTRC）,and the spinning of the warhead make the target’s scattering point produce a serious migration through Doppler cell and spread out the Doppler spectrum,and therefore it is a must to compensate them both.And the simulation results prove the correctness of the theoretical analysis.