频率步进毫米波雷达假目标干扰仿真与分析

Simulation and Analysis of False-Target Jamming Against Stepped-Frequency MMW Radar

为了提高距离分辨力,弹载毫米波雷达常采用频率步进体制。雷达发射的一串相参的频率步进信号经过逆傅里叶变换可以得到目标高分辨距离像,对该种体制雷达采用传统的噪声干扰不能起到满意的效果,必须采用相参干扰技术。主要研究了复制转发假目标干扰和灵巧噪声干扰两种相参干扰技术,首先从理论上研究两种干扰技术的干扰机理,然后研究不同干扰参数的干扰性能,比较了两种干扰技术的优劣,提出了对频率步进毫米波雷达的有效干扰方法,最后仿真验证了理论分析结果。

Stepped-frequency signal is usually used to improve range resolution in missile-born MMW radar. The coherent stepped-frequency pulse series are transmitted by radar, and then the high resolution range profile of target can be got using inverse Fourier transform. It＇ s invalid using traditional noise jamming against stepped-frequency radar, so coherent jamming must be used. Two kinds of coherent jamming technology are mainly researched： radar signal copy, retransmission jamming and smart noise jamming. The jamming mechanism is researched at first, and then jamming performance with different parameters is calculated. According to the jamming performance, an effective jamming method is propesed. At last, simulation results show the theoretical analysis is valid.