接收机畸变对辐射源指纹识别的影响

在辐射源个体识别技术应用中，接收机指纹和发射机指纹相互影响相互耦合，造成辐射源指纹库依赖于特定接收机，无法在不同接收机之间通用。针对此问题，对典型超外差接收机的滤波器、放大器畸变分量对接收信号指纹的影响进行了理论分析与实验验证。理论分析证明发射机和接收机的滤波器、放大器分量对于接收信号整体的畸变影响是等价的；实验中，利用两台超外差接收机对5台发射机进行个体识别测试验证，更换接收机前后，滤波器、放大器特征识别正确率分别从100%、95.5%降到20%，证明了接收机畸变分量对发射机指纹识别具有严重影响。该研究成果可为后续辐射源个体识别接收机设计以及接收机畸变校正提供理论依据。

Influence of receiver distortion characteristics on specific emitter identification

Receiver fingerprint and transmitter fingerprint are coupled with each other in the application of radiation source individual identification technology,which makes the radiation source fingerprint library depend on a specific receiver so as to not be used between different receivers.The filter and amplifier distortion components of two typical superheterodyne receivers are analyzed theoretically and experimentally.The theoretical analysis proves that the filter and amplifier components of the transmitter and receiver are equivalent to the distortion of the received signal.In the individual identification test experiments,five transmitters are identified by two superheterodyne receivers.Before and after the receiver is replaced,the recognition accuracy is reduced from 100% and 95.5% to 20% respectively,which proves that the characteristics of the receiver have a serious influence on the distorted fingerprint of the transmitter.The research and conclusions provide a theoretical basis for the design of receiver for individual identification of radiation source and the distortion correction of receiver.