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- W1969596560 abstract "A VHF omnidirectional radio range (VOR) is a navigation aid radio beacon facility, which provides aircraft with azimuth information relative to the VOR station in question as the origin. In Japan, two types of VOR-the conventional type (referred to as a CVOR) and the Doppler type (referred to as a DVOR)-are currently in use. An element known as the Alford loop antenna (ALA), which changes the loading reactance, is used for the VOR because the horizontally polarized wave and nondirectivity in the horizontal plane are preferred. A VOR antenna consists of a carrier antenna and a sideband antenna-an aircraft receives separate signals from these two antennas and compares them to obtain azimuth information. The mutual coupling between the elements forming the carrier and the sideband antenna affects the directivity of the single elements, resulting in errors in azimuth information. With the mutual coupling between the antenna elements being taken into consideration, a quantitative calculation was made by using the moment method-the results of the calculation made it clear that a loading reactance value of -320 /spl Omega/ is better to make not mutually coupled elements nondirectional while a loading reactance value of -600 /spl Omega/ is optimum to minimize the azimuth error of a CVOR." @default.
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- W1969596560 date "1998-05-01" @default.
- W1969596560 modified "2023-09-27" @default.
- W1969596560 title "Analysis of course errors on CVOR antennas (including effects of mutual coupling between elements)" @default.
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- W1969596560 doi "https://doi.org/10.1109/25.669078" @default.
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