基于射频功放非线性建模的欺骗干扰识别

Deception Jamming Identification Based on Nonlinear Modeling of RF Power Amplifier

针对欺骗干扰信号在时域、频域、空域与真实信号重叠,导致识别欺骗干扰的难度较大,假定真实发射机与欺骗干扰机射频前端器件除功放模块外均工作于理想状态,提出了一种基于射频功放建模的欺骗干扰识别方法。首先,利用Hammerstein模型对射频功放进行非线性建模,以模型参数作为提取的特征向量;其次,基于统计检测理论识别欺骗干扰;最后通过实验验证了方法的有效性,并与基于信号双谱特征的识别方法进行性能对比。实验结果表明,基于射频功放建模的欺骗干扰识别方法能够有效地识别欺骗干扰,且优于基于信号双谱特征的识别方法。

For deception jamming signals overlap with real signals in time domain, frequency domain and space domain,it is hard to identify the deception jamming. In this paper,it is supposed that the components of radio frequency （RF） front end in real transmitter and deception jammer except power amplifier model all operates in ideal stutus,a new identification method of deception jamming is proposed based on RF power amplifier modeling. Firstly, Hammerstein model is used to build up nonlinear model for RF power amplifier,and the model parameter is taken as the extracted eigen- vector;secondly, the theories of statistical and detection are used to identify deception jamming; lastly,an experiment is made to verify that the method is effective, and the performance of the method is compared with that of the identification method based on signal bispeetrum characteris- tic. The experiment results show that the deception jamming identification method based on RF power amplifier modeling can identify the deception jamming effectively, and its performance is pri- or than the performance of traditional method based on signal bispectrum characteristic.