接收机畸变对辐射源个体识别中调制器指纹特征的影响

Effect of Receiver Distortions on Modulator Fingerprint in Specific Emitter Identification

辐射源个体识别(Specific Emitter Identification,SEI)技术利用辐射源指纹特征识别发射设备,但辐射源指纹特征极易受接收机畸变的影响,无法在不同接收设备间通用。针对这一问题,基于一种利用调制畸变的辐射源个体识别方法,分析了接收机畸变对该方法特征识别结果的影响,得到了接收机畸变特性与特征估计结果的准确数学模型;并将推导结果与接收机设计指标相对应,对SEI接收机设计提出了建议;利用仿真实验和设计实例,证明了推导结果的准确性。该成果能够有效指导SEI系统接收机设计,并为跨接收机SEI系统的实现提供了可能。

Specific emitter identification(SEI)technology uses fingerprint characteristics to identify the transmitting device.However,the fingerprint characteristics are affected by the distortion of the receivers and cannot be used universally among different receiving devices.In order to solve this problem,an SEI method based on modulator distortions is analyzed,and the exact mathematical model of the relationship between receiver distortions and features is proposed.Then the results are translated to the index in receiver design and the suggestions about receiver design are given.The correctness of the proposed model is verified by the simulation and experiment.The achievement can be used in cross-receiver SEI to guide the receiver design.