常规的雷达线性调频及编码波形易被无源非合作雷达利用,目前的雷达波形设计中均未考虑到波形被利用的问题。针对该问题,提出一种基于多点频调制的反利用波形。波形设计上,利用minimax 方法设计出匹配滤波后具有多假目标的特殊频率编码波形,再对该波形进行多点频调制破坏匹配滤波的副瓣性能。在进行波形处理时,根据波形的先验知识,首先通过预先设计的陷波器进行去多点频调制,然后通过多约束条件下的凸优化方法进行失配滤波器设计,再采用设计的失配滤波器系数进行失配滤波,消除假目标的影响,降低副瓣水平,获得良好的探测指标。通过仿真分析了该波形在匹配滤波时副瓣水平高,存在多个假目标可混淆真目标的距离信息的特性,难以被无源非合作雷达利用,而优化处理可获得良好探测性能。

Conventional radar linear frequency modulation waveforms and coding waveforms are easily utilized by passive non-cooperative radars, and the current radar waveform design has not taken into account the issue of waveform exploitation. An anti-exploitation waveform based on multi-point frequency modulation is proposed to address this issue. In terms of waveform design, the minimax method is used to design a special frequency coded waveform with multiple false targets after matched filtering, and then multi-point frequency modulation is applied to this waveform to destroy the sidelobe performance of matched filtering. During the processing of waveform, based on the prior knowledge of the waveform, a pre-designed notch filter is used to remove multi-point frequency modulation firstly. Then, a convex optimization method under multiple constraints is employed to design a mismatch filter, and the designed mismatch filter coefficients are used for mismatch filtering to eliminate the influence of false targets, reduce sidelobe levels, and obtain good detection indicators. Simulation analysis show that the waveform has the characteristics of high sidelobe level and multiple false targets that can confuse the distance information of true targets during matched filtering, making it difficult for passive non-cooperative radars to utilize. However, optimization processing can achieve good detection performance.

TN957.51