Magnetic crossed-loop antenna
OwnerPaul R. Johannessen, Andre V. Grebnevinventors
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Abstract
A novel magnetic crossed loop antenna system is provided for use with radio navigation signals, such as provided by two or more Loran-C transmitters, and in which each loop antenna is rapidly switched between the receiving channel and that of the other loop-antenna to enable the selection of one channel with the strongest signals from both transmitters, and through tuning the antenna to the Loran-C frequency and providing rate compensation and feedback to the antenna, optimum signal-to-noise ratio, sufficiently wide bandwidth to ensure time delay stability and attenuated amplifier noise are achieved, enabling greatly improved location and tracking.
Claims9
A magnetic crossed-loop antenna apparatus having, in combination with a pair of orthoganally crossed loop antennas, a corresponding pair of receive channels for processing the radio signals received by the respective antennas from radio transmitting stations;
- means for rapidly switching each loop antenna back and forth between its channel and the channel of the other loop antenna and for selecting the antenna channel with the stronger signals therein;
- and means for providing optimum signal-to-noise ratio and sufficiently wide bandwidth in the receiving of the stronger signals in the selected antenna channel to ensure reception time delay stability.
Dependencies are inferred from the claim text.