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摘要:
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 Abstract:Cable coupling is one of the most important reasons for electromagnetic compatibility problems in avionics systems. Monitoring the cable coupling effect is of great significance. A method of monitoring the coupling signals on the ports with the spare wire in the cable is introduced. Since the monitoring wire is in the same conditions as the monitored one, the influence of the stochastic routing and field distribution could be counteracted. The monitoring and monitored wires could be regarded as the same two-port system, which could be described with an ABCD matrix. Then the frequency-domain analytical model of this system could be constructed with the transmission line theory. Finally, it could be converted to a discrete-time model and the signal flow graphs of the system could be achieved, which is convenient for the real-time signal processing and hardware realization. A four-wire cable system is taken as the case to validate the method. Compared with the results of measurement, the errors of the current peaks are less than 6%, which is small enough for practical applications. This fact proves that the method is effective and accurate.
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图 1 线缆耦合干扰实时监测方法原理
Figure 1. Principle of real-time monitoring method of cable coupling interference
图 2 监测/被测线缆系统二端口网络模型
Figure 2. Two-port network model of monitored or monitoring cable system
图 9 修正特性参数测试所用的测试端口
Figure 9. Port for measurement of modified characteristic parameters
图 11 端口阻抗幅度和相位特性测试结果
Figure 11. Measured results of port impedance magnitude and phase characteristics
图 13 监测线左右端口电压波形
Figure 13. Voltage waveforms on left and right ports of monitoring wire
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