ISAR雷达欺骗式干扰信号生成算法

摘要

宽带ISAR雷达能够从目标回波中计算得出众多目标特征，对ISAR雷达的干扰信号必须高逼真地模拟目标的电磁散射特性和运动特性。从弹头目标电磁散射机理出发，分析了干扰信号生成流程，提出二维成像干扰的实现方案。针对虚假目标特性模拟问题，提出基于一维距离像模板合成欺骗干扰信号的算法。算法采用距离像模板与实际宽带ISAR信号的卷积调制处理，生成的干扰信号能较好地反映目标的电磁特性。通过多个脉冲的模拟，生成的干扰信号也能够准确反映目标的运动特性。仿真实验对暗室测量数据和HRRP模板数据进行成像效果对比，验证了算法的有效性。该算法对二维成像干扰机的工程设计具有指导意义。%Since many target characteristics can be extracted from the echoes by wideband inverse synthetic aperture radar (ISAR),the jamming signal on ISAR need to simulate the electromagnetic scattering characteristics and kinematics characteristics with high fidelity.According to the electromagnetic scattering mechanism of missile target,the generation process of jamming signal was analyzed and a scheme for two-dimensional imaging jamming was proposed.Concerning the false target characteristic simulation issues,an algorithm was presented,using high range resolution profile (HRRP)template to synthesize a deception jamming signal via convolution operation with actual ISAR signal.By multiple pulses simulations,the obtained jamming signal is capable of simulating the electromagnetic and kinematic characteristics accurately.In numerical experiments,the imaging results were compared by using dark room measurements and HRRP template data,and it verified the effectiveness of the proposed algorithm,which has guiding significance for the engineering design of two-dimensional imaging jammer.