基于混沌同步和滤波的雷达波形设计  

Radar waveform design based on chaotic synchronization and filtering

作　　者：胡进峰[1] 张亚璇[1] 李强[2] 李会勇[1] 夏威[1] 

机构地区：[1]电子科技大学电子工程学院,四川成都611731 [2]九江职业技术学院,江西九江332007

出　　处：《系统工程与电子技术》2015年第2期278-283,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61101172;61101173;61371184)资助课题

摘　　要：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-20dB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。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 filte- ring. 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 do- main, 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.

关 键 词：雷达波形设计 混沌同步 频谱整形 信号恢复 匹配滤波 

分 类 号：TN957.51[电子电信—信号与信息处理]