通信信号有意调制对辐射源细微特征的影响分析

The influence of intentional modulation on the communication emitter fingerprint feature

为探究通信信号意调制对辐射源细微指纹的影响,着重分析了在不同参数下,有意调制对QPSK通信信号非高斯性特征的影响。首先,分析信号受到的有意调制,并给出相应的信号模型。其次,通过理论推导与仿真实验探究了有意调制对信号非高斯性特征的影响,并进一步分析携带信息、成型滤波器参数、载频等因素对信号非高斯性特征的影响。最终得出结论:有意调制会影响片段信号非高斯性的程度,且不同片段的影响程度相同。在将片段信号非高斯性作为指纹特征的情况下,应适当地增大信号片段的长度,有助于减小有意调制对指纹的干扰。

In order to investigate the influence of intentional modulation on the terminal fingerprint feature,how intentional modulation influences on the non-Gaussian characteristics of QPSK communication signals with different parameters is analyzed.Firstly,the intentional modulation for the signal is analyzed and the corresponding signal model is given.Secondly,the influence of intentional modulation on the non-Gaussian characteristics of the signal is investigated through theoretical derivation and simulation experiments.After that,the influence of carrier information,shaping filter parameters and carrier frequency on the non-Gaussian characteristics is explored.Finally,it is concluded that intentional modulation affects the non-Gaussian degree of the segment signal,and that of different fragments is the same.When taking the non-Gaussian character of the segment signal as the fingerprint feature,the length of the segment should be increased appropriately to reduce the interference of the intentional modulation to the fingerprint.