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该文研究了一种由电磁环境对电子设备产生的数字干扰来驱动的切换飞行控制系统性能分析模型。其中,从电磁干扰的产生原理角度,采用隐马尔可夫模型(Hidden Markov Model,HMM)描述数字电磁干扰特性并对其进行建模分析,同时针对HMM参数训练算法存在对初值选择敏感的问题,提出一种快速的初值选择策略,可以在经典Baum-Welch算法迭代下达到指定的收敛精度。最后将HMM电磁干扰注入分布式飞行控制系统性能观测平台,从理论与仿真的角度对比了不同电磁环境下分布式飞行控制系统的性能下降情况。仿真实验表明:与已有的数字电磁干扰建模分析方法相比,HMM具有更高的准确度,并且仿真所得性能下降程度与理论分析一致。
This paper studies the performance analysis model of a switched flight control system driven by the digital interference generated by the electromagnetic environment on electronic equipment. Among them, the Hidden Markov Model (HMM) is used to describe the characteristics of digital electromagnetic interference from the perspective of the principle of electromagnetic interference, and its modeling is analyzed. Meanwhile, there is a problem that the HMM training algorithm is sensitive to initial value selection , A fast initial value selection strategy is proposed, which can achieve the specified convergence accuracy under the iteration of classical Baum-Welch algorithm. Finally, HMM electromagnetic interference is injected into the performance observation platform of distributed flight control system, and the performance degradation of distributed flight control system under different electromagnetic environments is compared from the theoretical and simulation perspectives. The simulation results show that compared with the existing methods of modeling and analysis of digital electromagnetic interference, the HMM has higher accuracy, and the degradation of the simulation performance is consistent with the theoretical analysis.