复杂体制脉冲重复间隔调制方式识别

Modulation Type Recognition of Complex Pulse Repetition Interval

给出了一种新的雷达脉冲信号脉冲重复间隔PRI(Pulse repetition interval)调制方式识别算法。在分析PRI序列的时域及频域特性的基础上,定义了零交叉密度、谐波幅度比、PRI序列差分极性3个分类特征。特征提取方法简单且可在小样本条件下实现。此外,对于周期性调制PRI,可估计PRI调制周期。计算机仿真结果表明,本算法在有测量噪声、脉冲丢失、虚假脉冲条件下具有稳健的识别性能。

A novel recognizer for automatically reporting the pulse repetition interval（PRI） modulation type of a radar pulse signal is developed.The proposed method utilizes the features based on the properties of PRI sequence for each PRI modulation type both in time and frequency domains.These features are defined as zeros-crossing density,harmonic amplitude ratio and sign properties of difference of the PRI sequence,thus they can be easily extracted from PRI sequences with small sample sizes.In addition,the proposed method can be used to estimate the PRI modulation period for the periodic PRI modulation type signals.Simulation results show that the proposed approach is robust in the presence of measurement noises,missing and spurious pulses.