应用正交码组信号的传统雷达距离旁瓣抑制方法

Range Sidelobe Suppression for Conventional Radar Using Orthogonal Waveforms

为了抑制传统雷达的距离旁瓣和提高传统雷达抗欺骗式干扰性能,该文提出一种传统雷达随机发射一组正交信号的信号发射策略。给定一组正交性好且距离旁瓣低的相位编码信号,雷达在每次发射时从这组波形中随机选取一个波形进行发射,接收端已知该发射信号波形并基于该波形对接收信号进行脉冲压缩,最后对多次相邻脉冲的回波信号进行相干积累。理论分析和仿真结果均表明,距离主瓣信号能够有效积累,而距离旁瓣信号近似白化,因而脉冲积累后可明显降低系统的最大距离旁瓣电平。

In order to suppress range sidelobes and improve anti-deception interference performance of conventional radar, a novel waveform transmitting strategy is proposed for conventional radar using nearly orthogonal waveforms. Given a bunch of polyphase coded waveforms with good orthogonality and low range sidelobes, a randomly selected waveform would be transmitted at each transmission. The receiver has the knowledge of the randomly chosen waveform and then can match filtering received signals. Finally, coherent accumulation would be performed for received signals at multiple adjacent transmissions. Both theoretical analysis and numerical results indicate that as range mainlobes can be coherently accumulated while range sidelobes at different transmissions are approximately white, the peak sidelobe level can be suppressed significantly after coherent accumulation.