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系统辨识作为一种常用的“黑箱”系统建模方法,为评估测试系统在瞬态测量中的动态特性提供了重要依据。通过理论分析和仿真计算阐述了在全频带范围内建立宽带电磁脉冲(EMP)测试系统动态数学模型的局限性,在此基础上给出了一种连续域的分步辨识建模方法,可用于解决测试系统在全频带范围内的数学建模问题。仿真分析结果表明,分步辨识建模方法有效融合了测试系统的低频和高频动态校准数据,得到的一体化连续域辨识模型能反映测试系统从低频至高频全频带范围内的动态特性。实验测试结果也验证了此方法的可行性。
System identification as a commonly used “black box ” system modeling method provides an important basis for evaluating the dynamic characteristics of the test system in transient measurement. Through the theoretical analysis and simulation calculation, the limitations of establishing the dynamic mathematical model of the broadband electromagnetic pulse (EMP) testing system in the whole frequency range are expounded. Based on this, a continuous domain step-by-step identification modeling method is presented, Solve the test system in the whole band of mathematical modeling problems. The simulation results show that the step-by-step identification modeling method effectively combines the low-frequency and high-frequency dynamic calibration data of the test system. The integrated continuous domain identification model can reflect the dynamic characteristics of the test system in the whole frequency range from low frequency to high frequency. Experimental results also verify the feasibility of this method.