电气化铁道对基带数传和数字电话干扰影响的研究

STUDY ON INTERFERENCE OF A.C.ELECTRIFIED RAILWAYS UPON BASEBAND DATA TRANSMISSIONS AND DIGITAL TELEPHONES

本文从理论上详细分析了交流电气化铁道在沿线通信线路中感应的杂音电动势,对在该线路上开通的基带数据传输和数字电话系统的干扰影响。实验证明,这种理论分析是正确的。结论是:1.电气化铁路沿线基带数传会受到一定的干扰影响,它使信噪比劣化,在传输距离适当缩短后可以排除。2.电气化铁路沿线的数字电话系统中感应的杂音干扰影响极微,一般可以忽略。

A detail theoretical analysis is made in this paper on the effect of noise e.m. f. induced in communication lines along railway by A.C.electrified rail-ways upon baseband data transmissions and digital telephones.The conclu-sions are that:1. there can be certain interference on baseband data transmis-sions along the railway. the resulting deterioration of signal noise ratio canbe eliminated when the distance is shortened properly.2. the interference ondigital telephone systems along the railway is very small and generally canbe neglected.