基于LTE信号的外辐射源雷达副峰特性及抑制方法研究

针对基于LTE信号的外辐射源雷达，首先根据LTE信号结构分析了其模糊函数的特性，解释了不同类型副峰的产生机理。然后，针对对探测性能有影响的两类副峰，提出相应的抑制算法:对于循环前缀副峰，提出数据非连续分块的快速互模糊算法；对于频谱不连续产生的副峰，提出频带合成和频域加窗的抑制算法。最终通过两种抑制算法的综合处理，得到LTE信号图钉状的模糊函数。该文工作为基于LTE信号的外辐射源雷达副峰抑制提供了新的方法。

Research on Characteristics and Suppression Methods of Side Peaks of Passive Radar Based on LTE Signal

For the passive radar based on Long Term Evolution (LTE) signal, firstly, the ambiguity function are analyzed, and the producing mechanism of different side peaks are explained. Then, a series of corresponding suppression algorithms are proposed for two types of side peaks degrading detection performance: For the side peaks caused by the cyclic prefix, a fast ambiguity algorithm based on non-continuous chunking of data is proposed; For the side peaks caused by the non-continuous spectrum, the suppression algorithm of bandwidth synthesis and frequency domain windowed is proposed. Finally, the thumbtack ambiguity function of the LTE signal is obtained through integrated processing of two suppression algorithms. The work of this paper provides a new method for the side peaks suppression of the passive radar based on the LTE signal.