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Method for determining weak electromagnetic coupling paths between multi-frequency interference pairs

A technology of electromagnetic coupling and determination method, which is applied in the fields of electromagnetic field characteristics, measurement of electricity, measurement of electrical variables, etc., can solve problems such as poor investigation targeting, time-consuming and labor-intensive, etc., to solve electromagnetic compatibility problems, low cost, and effective electromagnetic compatibility problems. Effect

Active Publication Date: 2013-06-26
BEIHANG UNIV
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Problems solved by technology

[0004] The present invention converts the electromagnetic coupling relationship between interference pairs into a directed graph, and uses the shortest path tracing to find the weak path for many times, and finally obtains the rectification link and key rectification points, which solves the problem of point-by-point troubleshooting based on experience in the past. Strong, time-consuming problem

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  • Method for determining weak electromagnetic coupling paths between multi-frequency interference pairs
  • Method for determining weak electromagnetic coupling paths between multi-frequency interference pairs
  • Method for determining weak electromagnetic coupling paths between multi-frequency interference pairs

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Embodiment

[0059] During the joint debugging test of an aircraft electronic system, it was found that the fuel gauge was interfered by the short-wave radio station and the fire control system. After analysis, it was found that two frequency points of the short-wave radio station interfered with the fuel gauge, and the fire control system also had two frequency points. The frequency points interfere with the fuel gauge, and the four frequency points are inconsistent with each other.

[0060] The working principle diagram of short wave radio station, fire control system and fuel gauge is as follows Figure 5 As shown, by analyzing the possible links of the fire control system and the short-wave radio station interfering with the fuel gauge, the following main interference paths can be obtained:

[0061] 1) The stray signal of the fire control system enters the public power supply through the crosstalk of the power line and interferes with the fuel gauge;

[0062] 2) The stray signal of th...

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Abstract

The invention relates to a method for determining weak electromagnetic coupling paths between multi-frequency interference pairs and belongs to the technical field of electromagnetic compatibility. The method includes: converting electromagnetic coupling relation between interference sources and sensitive bodies in the system into digraphs, evaluating edges coupled with the digraphs at different frequency points by means of simulation and test, searching for weak coupling paths of each pair of interference sources and sensitive bodies at corresponding frequency points from a plurality of electromagnetic interference coupling digraphs through a shortest-path tracking method, sequencing peaks of all the weak paths according to times of the peaks appearing on weak links, and rectifying coupling channels on interference links according to the sequence. Therefore, repair and reinforcing of system electromagnetic compatibility faults are realized efficiently and accurately, the problem about electromagnetic compatibility can be solved accurately and effectively by low cost, and the method has great guidance significance in reinforcement and rectifying of the system electromagnetic compatibility.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic compatibility, and relates to a method for finding a weak path of electromagnetic compatibility coupling between interference pairs, more precisely, it is a method for determining the weak path of electromagnetic coupling that an interference source interferes with a sensitive body at multiple frequency points . Background technique [0002] In the work of an electronic system, the electromagnetic interference generated by a certain device will be coupled to another device through conducted emission (CE) and radiated emission (RE), causing the performance of the other device to degrade or even malfunction. With the increasing integration and complexity of electronic systems, the electromagnetic coupling relationship between interference equipment and sensitive equipment is becoming more and more complex. Interference signals can reach sensitive objects through multiple coupling paths and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R29/08
Inventor 苏东林吴亮贾云峰苏航魏嘉利刘焱马超胡修
Owner BEIHANG UNIV
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