Interference rejection technique
First Claim
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1. An apparatus for receiving signal waves of generally the same frequency from a plurality of different directions, and for selecting signal waves from a desired direction comprising:
- antenna means, having a receiving position, for receiving signal waves from a plurality of different directions;
means for repetitively moving the receiving position along a predetermined path of motion thereby inducing direction dependant frequency modulation in the received signal waves; and
,means for selecting signal waves from a desired direction responsive to the induced direction dependant frequency modulation of the received signal waves.
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Abstract
This invention relates to interference suppression or reduction means in receiving systems, and more particularly to apparatus for suppressing interference in receiving equipment by locally inducing a sufficiently large frequency difference between a desired signal and an undesired signal arriving from a different direction at the receiving site.
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Citations
14 Claims
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1. An apparatus for receiving signal waves of generally the same frequency from a plurality of different directions, and for selecting signal waves from a desired direction comprising:
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antenna means, having a receiving position, for receiving signal waves from a plurality of different directions; means for repetitively moving the receiving position along a predetermined path of motion thereby inducing direction dependant frequency modulation in the received signal waves; and
,means for selecting signal waves from a desired direction responsive to the induced direction dependant frequency modulation of the received signal waves. - View Dependent Claims (2, 3, 4)
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5. In a communication system wherein signal waves of generally the same frequency are provided to a plurality of transmitters, each having a signal wave radiating position, and wherein the signal waves are transmitted from the transmitters to a receiver, having a signal wave receiving position, the improvement comprising:
means for rejecting interference between signal waves transmitted by the plurality of transmitters including; means for repetitively moving at least one of said radiating and said receiving positions along a predetermined path of motion, thereby inducing direction dependant frequency modulation in the received signal waves; and
,means for rejecting signal waves from at least one of the plurality of transmitters responsive to the induced direction dependant frequency modulation of the signal waves.
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6. In a system in which signal waves are radiated from at least one radiating position and the signal waves are received at a receiving position from a plurality of different directions, a method of suppressing interference by rejecting signal waves from at least one of the plurality of directions comprising the steps of:
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repetitively moving one of said radiating and receiving positions along a predetermined path of motion thereby inducing direction dependant frequency modulation in the received carrier waves; and
,rejecting received signal waves from at least one of the plurality of directions by suppressing signal waves responsive to the induced direction dependant frequency modulation thereof. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method for selecting signal waves received from a desired direction comprising the steps of:
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providing at least one position for radiating signal waves; providing at least one position for receiving the signal waves; repetitively moving one of said radiating and receiving positions along a path of motion thereby inducing direction dependant frequency modulation in the signal waves; and
,selecting signal waves from the desired direction responsive to the induced direction dependant frequency modulation of the signal waves. - View Dependent Claims (13, 14)
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Specification