The VHF omnirange radial system (VOR) is used extensively as an aircraft navigational aid, and the need for greater utility of VOR has led to a requirement for greatly improved standards and traceable calibration facilities in this parameter. The paper presents the development and assessment of two standard VOR waveform synthesisers and a VOR waveform decoder. The synthesiser designs use the technique of regeneration of a wave shape which has been 'fixed' by digital methods in an addressable memory. The technique has been refined and brought to a state of high precision. One synthesiser is a complex desk-top computer-controlled system which, as well as being a standard, is excellent for producing imperfect waveforms. The second synthesiser standard is a compact portable unit suitable for field system testing and standards dissemination. The decoder design is based on digital sampling and storage of one cycle of the composite 'audio' waveform: this data is then Fourier transformed and analysed to determine the FM modulation depth and the differential phase of the two 30 Hz modulating signals - the VOR bearing angle.


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    Title :

    VOR waveform synthesis and calibration


    Additional title:

    Synthese und Kalibrierung der Wellenform des Rundsichtradars


    Contributors:
    White, R.A. (author) / Clarke, R.N. (author) / Yell, R.W. (author)


    Publication date :

    1981


    Size :

    8 Seiten, 5 Bilder, 6 Tabellen, 9 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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