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提出了一种线性调频波的转发干扰对消方法,该方法利用匹配滤波输出存在时延与频移上的强烈耦合,通过调整对消波的相位和频移,使其匹配滤波输出与原回波输出基本满足时间重合、幅值相近、相位相反的对消关系,减小回波总输出幅值,即可有效降低其被检测概率;推导了只进行调相转发的对消输出公式和同时进行调频调相转发的对消输出公式,分析了其理论输出特性,并分别对其进行了仿真验证.仿真结果表明,对消波若只进行相位调制,其对消效果与转发时延和信号带宽之积相关,此值越小则对消效果越好,但对相位调制和幅度控制的精度要求也越高;对消波若同时进行相位和频率调制,其对消效果由转发时延与信号脉宽之商直接决定,此值越小则对消效果越好,带宽不影响对消效果,但带宽越大则对消效果对频率调制精度要求越高.
A new method to cancel the jamming of LFM is proposed. This method utilizes the strong coupling between the output delay and frequency shift of the matched filter. By adjusting the phase and frequency shift of the filter, The wave output basically satisfies the cancellation relations with the same time, the same amplitude and the opposite phase, and reduces the total output amplitude of the echo, which can effectively reduce the detection probability. The cancellation output formula and the simultaneous The output of the cancellation of the FM phase-modulated signal is analyzed, and its theoretical output characteristics are analyzed and simulated respectively.The simulation results show that if only the phase modulation of the cancellation wave, the cancellation effect and the forwarding delay and the signal The product of the bandwidth, the smaller the value of the cancellation effect the better, but the accuracy of the phase modulation and amplitude control requirements are higher; if the cancellation wave phase and frequency modulation at the same time, the cancellation effect by the forwarding delay and The signal pulse width of the business directly determines, the smaller the value of the cancellation effect is better, the bandwidth does not affect the cancellation effect, but the bandwidth of the cancellation effect of the higher the frequency modulation accuracy.