间歇采样重复转发式干扰特性分析

Characteristics Analysis of Interrupted-Sampling Repeater Jamming

间歇采样重复转发式干扰是一种新型相干干扰,它可以在脉冲压缩中获得部分增益,同时具有压制和欺骗两种干扰效果,对现代雷达构成了较大威胁。对干扰特性的充分了解是实现有效干扰辨识和对抗的前提。本文在介绍间歇采样重复转发干扰工作原理的基础上,首先对线性调频和相位编码两种信号下的干扰进行建模并推导了相应的脉压输出;其次,理论分析了干扰假目标的形成机理以及关键参数对干扰特性的影响;最后,通过仿真比较了不同信号下间歇采样重复转发式干扰对目标检测性能的影响。仿真结果表明,对于线性调频信号干扰效果表现为欺骗性,而对于相位编码信号干扰效果表现为压制性。

Interrupted-sampling repeater jamming is a new kind of coherent interference, it can obtain partial pulse compression gain. The jamming can achieve effects of both deception and suppression, which make it a big threaten to modern radar. Fully understanding jamming characteristics is the precondition of achieving jamming recognition and countermeasure. In this paper, jamming model is firstly built and related analytical expression of pulse compression output is derived on the basis of introducing the principle of interrupted-sampling repeater jamming; then, analyzing formation mechanism of jamming false target and the influence of key parameters on the interference characteristics. Finally, the influence of inter- rupted-sampling repeater jamming on target detection performance under different signals is compared by simulation. Simulation results demonstrate that jamming effect is deceptive for linear frequency modulation signal and it＇ s suppressible for phase coded signal.