基于正交分集的灵巧噪声干扰对抗方法*

针对数字射频存储干扰机多通道宽带转发模式下的灵巧噪声干扰,提出了基于混沌调制信号、多谐波相位调制线性调频信号的正交分集抗干扰方法。混沌调制信号与多谐波相位调制线性调频信号具有“图钉”型模糊函数,除了具有良好的距离、多普勒分辨力,而且对回波频率敏感,通过正交分集设计,能够更好的适应宽带转发灵巧噪声干扰。通过计算机仿真对新方法的抗干扰性能进行了分析和验证,结果表明,在多通道宽带转发灵巧噪声干扰环境下,新方法的抗干扰改善因子能够达到10dB以上,抗干扰性能明显优于传统的频率捷变、斜率捷变方法。

An ECCM Scheme for Smart Noise Jamming Based on Orthogonal Diversity

In response to the smart noise jamming under multi-channel broadband digital radio frequency memory (DRFM) repeater jammer, an orthogonal decomposition method for anti-jamming is put forward on basis of chaotic modulation signals and multi-harmonic phase modulation chirp signals. Both chaotic modulation signal and multi-harmonic phase modulation chirp signal have a "thumbtack" ambiguity function. They are not only of good resolving power in range and Doppler, but also of good sensitivity to echo frequency. By an orthogonal and diverse design, they can better adapt to the smart noise jamming under multi-channel broadband DRFM repeater jammer. The result of analysis and validation on the anti-jamming performance of the new method through computer simulation has shown that under smart noise jamming in multi-channel broadband DRFM jammer, the ECCM improvement factor of the new method can be more than 10dB, which is much better than that of the traditional frequency and slope agility method..