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线缆耦合是航电系统电磁干扰问题的主要来源之一,对其进行监测具有重要意义。利用线缆束中的非功能线作为监测线,实现了一种对功能线缆耦合到的干扰信号进行实时监测的方法。由于监测线与被测线具有相似的干扰场分布和布线路径,因此可以抵消二者的未知性和随机性带来的影响。将监测线与被测线视为相同的二端口网络,建立采用ABCD矩阵描述的端口电流相互关系,进而利用传输线理论建立频域解析模型,将其转化为离散时间模型并给出系统的信号流图,为硬件实现提供基础。以一个四芯传输线系统为例对本文方法进行了验证,与实测结果对比,端口电流峰值误差不超过6%,验证了本文方法的有效性和精度。
Cable coupling is one of the main sources of EMI problems in avionics systems, and it is of great significance to monitor them. By using the non-functional wire in the cable bundle as the monitoring line, a method for real-time monitoring of the interfering signal coupled to the functional cable is realized. Because the monitoring line and the measured line have similar interference field distribution and routing path, it can offset the influence of both the unknown and the randomness. The two-port network with the same monitoring line and the measured line is regarded as the same, and the relationship between the port currents described by the ABCD matrix is established. Then the frequency-domain analytical model is established by using the transmission line theory, which is transformed into a discrete-time model and the signal flow Figure, provide the basis for the hardware implementation. Taking a four-core transmission line system as an example, the method in this paper is validated. Compared with the measured results, the peak current port error does not exceed 6%, which verifies the effectiveness and accuracy of the proposed method.