Antenna Phase Centre Movement in U.H.F. Radio Positioning Systems
NEW BRUNSWICK UNIV FREDERICTON DEPT OF ELECTRICAL ENGINEERING
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Yagi array configurations such as are commonly used in UHF electronic distance measuring EDM systems are analysed to show the antenna phase centre movement for any look angle. It is shown that large phase centre movements may occur within the antenna main-beam pattern and the movement of phase centre is directly related to the angular derivative of the polar radiation pattern. A simple technique is proposed for qualitatively estimating the suitability of any antenna for this type of EDM application and a complete model is presented to evaluate the error introduced for any transmitter-receiver antenna orientation. Extensive results are presented for 7- and 12-element Yagis such as are commonly used in the SYLEDIS UHF Radio Positioning System.
- Electrical and Electronic Equipment
- Target Direction, Range and Position Finding
- Radio Communications