基于混沌同步和滤波的雷达波形设计

可匹配滤波混沌雷达系统可由低成本的模拟器件实现匹配滤波,受到广泛关注。但是该系统发射信号的带限性能不理想,信号在变换和传播过程中容易发生频谱泄露和畸变。针对该问题,提出一种基于混沌同步和滤波的波形设计方法。该方法在雷达发射端,将混沌信号频谱整形为带限信号;在接收端,利用同步和滤波恢复出混沌信号。与传统在数字域上进行信号设计的方法相比,本文方法是在模拟域上实现的,具有低成本优势。此外,在信噪比低至-20 dB时本文方法仍然有效,与直接匹配滤波相比,本文方法变换后的混沌信号匹配滤波后,最大旁瓣抬升很小。

Radar waveform design based on chaotic synchronization and filtering

The matched filter of the matched filterable chaotic radar system can be implemented by low cost analog devices and received widespread attention. But the transmitted signal of this system is not a band limited signal, causing signals in the process of transformation and propagation prone to spectrum leak and distortion. To solve the problem, this paper proposes a waveform design method based on chaotic synchronization and filtering. In the radar transmitter, make the chaotic signal become a band limited signal by filtering to shape the spectrum of it; in the receiver, use synchronization and filtering to recover the chaotic signal. Compared with traditional signal design methods in the digital domain, the proposed method is implemented in the analog domain, with an advantage of low cost. In addition, the proposed method is still valid when the SNR is as low as -20 dB. Compared with the source signal process matched filtering directly, the maximum side lobe of the transformed signal in this method after matched filtering is elevated slightly.