双冗余机制下的传输线特征阻抗分析

doi:10.12305/j.issn.1001-506X.2021.08.33

Abstract

Abstract:

In aerospace system, the redundancy mechanism like dual-line back-up method may change the parallel impedance of the transmission line, which may lead to signal deterioration. In this paper, on the multiconductor transmission line theory, an impedance model in redundant condition is proposed. Theoretical and simulation analysis are performed to evaluate the impedance of five redundant connection styles under three commonly used structures with one shared shielding. Theoretical analysis indacates that the impedance of the redundant cable assemblies is determined by both the parameter matrix and the redundancy feature matrix of the cable. Simulation result indicates that the quad-twisted structure has better impedance continuity than the others. Compared with independent shielding structure, the quad-twisted structure of the cable could reduce the weight of cable assemblies meanwhile maintaining the impedance continuity, which shows an experience and a reference for the design redundancy cable network of launch vehicle.

Key words: transmission line, impedance match, redundancy transmission, cable network

CLC Number:

TN913.32

Fan ZHU, Kai XIE. Analysis of the characteristic impedance of the transmission line under dual redundancy mechanism[J]. Systems Engineering and Electronics, 2021, 43(8): 2303-2310.

Figures/Tables 12

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Table 1

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References 31

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结构	形状	材料	厚度/mm
导体	Circle	Cu	0.5(直径)
绝缘层	wrap	PE	0.4
束套内填充物	Circle	PE	填充
电缆束屏蔽层	Wrap	Cu	0.5
电缆束外层绝缘层	Wrap	PE	0.5

冗余方式	电容 (pF/m)	电感 (nH/m)	仿真阻抗 Ω	实测阻抗 Ω
屏蔽双绞线	61.8	624.1	100.5	100.0
屏蔽双绞线对	123.7	311.7	50.2	50.0
同相二次绞合	114.6	336.6	54.2	54.4
反相二次绞合	104.4	369.5	59.5	55.4
四绞同侧连接	89.2	432.2	69.6	61.9
四绞对角连接	123.0	313.6	50.5	49.5

冗余结构	均值	最大值	最小值	方差
松散双绞线	59.3	61.5	57.2	1.347
同相连接	57.6	58.7	56.7	0.544
反相连接	62.0	62.8	61.0	0.496
同侧连接	69.1	69.6	68.7	0.230
对角连接	50.3	50.4	50.2	0.077

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Analysis of the characteristic impedance of the transmission line under dual redundancy mechanism

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References 31

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冗余结构	长度/m	p₁/mm	p₂/mm	示意图
双绞线	10	50	—	—
屏蔽双绞对	10	50	—	图 5
双绞线二次绞合	10	50	100	图 6
四线并绞	10	—	100	图 7