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针对混合SFH/DS信号跳频频率估计问题,提出了对信号时频脊线进行动态聚类分析,初步确定跳频频率范围的方法;在此基础上根据混合SFH/DS信号的特点,在频率搜索范围内利用高阶循环累积量精确估计跳频频率。以SFH/DS-2、4PSK信号为例,证明了其四阶循环累积量仅在跳频频率处存在的结论,通过检测此循环频率实现了跳频频率的精确估计。该算法无需信号的先验信息,易于通信侦察接收机实现。仿真实验表明,该算法混合FH/DS信号跳频频率估计是十分有效的。
In order to solve the problem of frequency hopping in SFH / DS hybrid signals, a dynamic clustering analysis of the signal time-frequency ridgelines is proposed to determine the frequency hopping frequency range. Based on the characteristics of mixed SFH / DS signals, Estimation of frequency hopping frequencies using high order cyclic cumulants in the search range. Taking the SFH / DS-2, 4PSK signal as an example, it is proved that the fourth-order cyclic cumulant exists only at the frequency hopping frequency. By detecting this cyclic frequency, an accurate estimation of the frequency hopping frequency is achieved. The algorithm does not need prior information of the signal and is easy to implement by the communication reconnaissance receiver. Simulation results show that this algorithm is very effective in frequency hopping frequency estimation of FH / DS signals.