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US 3,972,044 AGranted
Antenna system for Doppler VOR ground stations
OwnerAndrew Alfordinventor
Life of this patent
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Abstract
A method used to correct counterpoise distortion of horizontal patterns of antennas radiating horizontally polarized high frequency radiation is described and is applied to reduce undesirable amplitude modulation of the scanned carrier causing bearing errors in a doppler VOR System with amplitude modulated reference used in air navigation.
Claims6
A radiating antenna system, radiating horizontally polarized waves comprising means providing a conductive horizontal elevated sheet of limited dimensions,
- A. first radiating means centrally located with respect to said conductive sheet, said radiating means having a substantially omnidirectional radiation pattern and radiating a first frequency,
- B. first transmitter means for energizing said first radiating means,
- C. second omnidirectional radiating means, comprising a plurality of directional antennas arranged on the conducting sheet around the first means, each oriented to radiate maximum radiation toward the first radiating means, said second means radiating a second frequency,
- D. second transmitter means for sequentially energizing said second radiating means,
- E. whereby the radiation center of said second radiating means effectively moves around said first omnidirectional radiation means.
2 more elements
Dependencies are inferred from the claim text.