地面雷达抗箔条干扰技术研究

箔条是一种重要且有效的无源干扰方式。箔条弹投放之后，其速度下降较慢，雷达截面积迅速变大，此时箔条信号幅度远大于目标机的，而两者在相同的距离门内，导致可能无法检测到目标机信号。本文基于地面雷达系统，提出了在跟踪帧和搜索帧同时使用自适应动目标显示，实现飞机和箔条信号的频域分离；根据含有多普勒频率的线性调频信号经过脉冲压缩处理后峰值点发生偏移的特点，提出了使用大时宽带宽比的线性调频信号，实现飞机和箔条信号的时域分离。进行了雷达信号级仿真实验，结果表明本文提出的措施具有较好的抗箔条干扰能力, 可以快速而正确的获得目标机信号。 

Research on Ground Radar Anti-Chaff-Jamming Technology

Chaff is an important and effective passive jamming method. After the chaff has been launched, its speed decreases relatively slowly while the Radar Cross Section (RCS) enlarges quickly, so the signal amplitude of chaff is far bigger than the aircraft’s, but the two are in the same “distance gate”, which causes that signal of the target may can’t be detected. In this paper, based on ground radar system, firstly, adaptive moving target indication method is used to distinguish the aircraft and chaff signal in the frequency domain, both in tracking and searching frame. Secondly, the peak of linear frequency modulation signal with Doppler frequency will shift after pulse compression processing, a LFM signal, pulse width is much wider than band width, is proposed to be used to separate the aircraft and chaff signal in time domain. The results of radar signal level simulation show that the proposed algorithms can do well in anti chaff jamming, then the target’s signal can be obtained quickly and correctly.