基于频域调制的相干噪声干扰研究

Coherent Noise Jamming Based on Modulation of Frequency Domain

针对线性调频脉冲压缩雷达,提出了一种移频干扰新样式——噪声移频干扰。利用信号分解理论研究了干扰信号的时域和频域特性,推导了干扰信号脉冲压缩输出的近似表达式。理论分析表明,噪声移频干扰信号经脉压处理后为覆盖一定距离范围的似噪声干扰带,通过调整干扰信号参数可改变干扰带覆盖范围、干扰带中心位置和干扰带内能量分布。由于干扰获得了部分压缩增益,较低的干扰功率就可实现遮盖干扰。仿真实验证实了理论分析的正确性和干扰的有效性。

A new shift-frequency style named noise-shift-frequency is proposed for jamming the LFM pulse compression radar based on analysis of the principle of the radar. The jamming signal＇ s characteristics in time and spectrum are analyzed according to the theory of signal decomposition, and then the approximate expression of the jamming output is deduced. Theoretic analysis shows that the jamming signal＇ s pulse compression output is a noise-like swath covering definite distance. The jamming scope, jamming area and jamming energy distribution can be controlled by altering the signal＇ s parameters. As the jamming signal obtains some compression gain, the covering jamming takes effect with lower jamming power. Simulation proves that the theoretic analysis is correct and the jamming is effective.