采用正交分集的灵巧噪声干扰对抗方法

Electronic counter-countermeasures scheme for smart noise jamming using orthogonal diversity

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"形模糊函数,除了具有良好的距离、多普勒分辨力,还对回波频率敏感,通过正交分集设计,能够更好地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10 d B以上,抗干扰性能明显优于传统的频率捷变、斜率捷变方法。

In response to the smart noise jamming under multi-channel broadband digital radio frequency memory repeater jammer,an orthogonal decomposition method for anti-jamming was put forward on basis of chaotic modulation signals and multi-harmonic phase modulation chirp signals.Both of these two signals 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 digital radio frequency memory repeater jammer.The result of analysis and validation on the anti-jamming performance of the new method through computer simulation shows that under smart noise jamming in multi-channel broadband digital radio frequency memory jammer,the electronic counter-countermeasures improvement factor of the new method can be more than10dB,which is much better than that of the traditional frequency and slope agility method.