电路端口电磁脉冲响应仿真分析

Analysis of simulation about circuit response caused by electromagnetic pulse

为了将系统辨识理论用于典型电路电磁脉冲效应敏感度预测领域,利用电路仿真软件PSPICE,选用基础单元电路,并在可变的脉冲干扰下获得其端口仿真条件下的响应输出。根据系统辨识理论,运用1组输入输出数据建立电路能量耦合模型。模型的预测输出与实际输出的拟合度能够达到98.5%,说明模型的精度达到了要求。通过改变干扰电压的各项参数,对比实际输出与模型输出的拟合度,检验任意干扰下模型的适用性。结果表明,模型输出的峰值、趋势都能逼近实际输出;参数改变幅度越大,拟合度越低。这一方法能够在一定程度上反映电路对脉冲干扰的敏感性能,为电磁脉冲效应敏感度预测新方法的探索打下基础。

A base unit circuit is selected to study the effects of a typical circuit under Electromagnetic Pulse（EMP） interference and research the methods of susceptibility forecasting with system identification theory based on simulation software PSPICE. According to system identification theory, a set of energy coupling circuit models is established by input and output data. The Goodness of Fit（GOF） between the predictive output and actual output achieves 98.5%, indicating that the model is suitable. The GOF is compared and its applicability is tested by changing the parameters of interference voltage. The results show that the peak and the trend of the output waveform of the model can approximate the actual output ; the larger magnitude of the parameters changes, the lower the fit. To a certain extent, the approach can reflect the sensitivity of the circuit to the pulse interference, thus it can lay a foundation for exploring new method of predicting sensitivity of the circuit electromagnetic pulse effect.