Measurements of the electrical impedance of railway track have been made and the corresponding distributed transmission line components evaluated for wet and dry environmental conditions. Audio frequency (blockjointless) track circuits using various terminations are reviewed and their applicability in terms of safety, shunting sensitivity and resolution is assessed. Amplitude and frequency shift keying techniques for modulating the track circuit carrier frequency are evaluated and some practical examples are given of data transmission using various coding and modulation schemes. The effectiveness of AF track circuits for transmitting safety signalling information to moving trains is dependent upon the quality of rail as a transmission medium. The modulated signal bandwidth is limited if traditional analogue techniques are used, but by adopting signal coding and demodulation methods it appears possible to increase considerably the quantity of information transmitted and yet retain signal security.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Train position detection and track-train data transmission using audio frequency track circuits


    Additional title:

    Zuglageerkennung und Gleis-Zug-Datenuebertragung mit Hilfe von Tonfrequenzkriesen


    Contributors:
    Hill, R.J. (author)


    Publication date :

    1985


    Size :

    11 Seiten, 13 Quellen


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    TRAIN DIRECTION DETECTION VIA TRACK CIRCUITS

    HOGAN BRIAN | European Patent Office | 2018

    Free access

    Train direction detection via track circuits

    HOGAN BRIAN | European Patent Office | 2017

    Free access

    TRAIN POSITION AND TRACK DEVIATION DETECTION SYSTEM

    YUN YONGCHUN / CHOI BYEONGHYEOK / KIM HYANGSIG | European Patent Office | 2022

    Free access

    Track-train dynamics

    Abbott, P. W. / Morosow, G. / Macpherson, J. | NTRS | 1975


    Track- train dynamics.

    Abbott,P.W. / Morosow,G. / MacPherson,J. et al. | Automotive engineering | 1975