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.
VOR waveform synthesis and calibration
Synthese und Kalibrierung der Wellenform des Rundsichtradars
IEE Proceedings, Part F (Communications, Radar and Signal Processing) ; 128 , 7 ; 443-450
1981
8 Seiten, 5 Bilder, 6 Tabellen, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
Ultrabroadband Arbitrary Electromagnetic Waveform Synthesis
British Library Online Contents | 2006
|WaveForm DSP2 Arb Waveform software
Emerald Group Publishing | 1999