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识别雷达信号的脉冲重复间隔(PRI)调制模式是分析雷达工作状态和工作任务的重要手段。针对复杂体制雷达的PRI调制模式可实时切换并改变调制参数因而难于识别的问题,提出一种基于极值序列特征集的雷达PRI调制模式识别算法。该算法首先提取PRI序列的极值特征,构建极值序列特征集;然后,基于PRI序列及其特征集建立恒参、类正弦、正弦和抖动判定准则,实现雷达PRI调制模式的分层识别。仿真分析表明:该算法对复杂体制雷达PRI调制模式的识别正确率达95.3%,同时具有较高的实时性,在电子对抗应用领域具有良好的前景。
The pulse repetition interval (PRI) modulation mode for identifying radar signals is an important means of analyzing the working status and tasks of the radar. Aiming at the problem that the PRI modulation mode of complex system radar can be switched in real time and the modulation parameters are difficult to identify, a PRI modulation pattern recognition algorithm based on the extreme sequence feature set is proposed. Firstly, the extreme feature of PRI sequence is extracted and the feature set of extreme value sequence is constructed. Then, based on the PRI sequence and its feature set, the criteria of constant parameters, sinusoids, sine and jitter are established to realize the hierarchical identification of PRI modulation mode. Simulation results show that the proposed algorithm can recognize the PRI modulation mode of complex system with a correct rate of 95.3%, and has high real-time performance. It has a good prospect in the field of electronic countermeasures.