考虑多普勒效应的脉冲无意调制特征比较

A Comparison of Unintentional Modulation on Pulse Features with the Consideration of Doppler Effect

脉内无意调制特征是雷达特定辐射源识别的基础和关键。该文在考虑多普勒效应的条件下,对工程中常用的脉内无意调频与无意调相特征进行了可分性比较。首先给出了高斯白噪声以及中、高信噪比条件下,脉内信号相位的简化观测模型;在分析以往关于两种待比较特征的提取流程的基础上,给出了特征定义;然后利用基于离散度矩阵的可分性判据对两种特征进行了理论的可分性比较。结果显示,脉内无意调相特征对噪声的鲁棒性相对更强。仿真实验以及104个实测雷达的个体识别试验验证了上述结果。

Characteristics of Unintentional Modulation On Pulse （UMOP） are key and fundamental for radar Specific Emitter Identification （SEI）. In this paper, the common used unintentional frequency and phase modulation features are compared with the consideration of Doppler effect. Under the assumptions of Gaussian White Noise （GWN） and moderate to high Signal-to-Noise Ratio （SNR） level, a simplified observation model of the intrapulse phase is presented. Feature definition is carried out, based on the analysis of existing feature extraction procedure. Then the separabilities of features are theoretically compared by using a criterion derived from intra-class and inter-class scatter matrixes. Result shows that the unintentional phase modulation on pulse feature is more robust to noise. This result is validated by simulations and real SEI tests with 104 radar instances.