Space adaptive coherent sidelobe canceller
First Claim
1. An interference suppression system for cancelling interference from a multiple source environment comprising:
- a main channel sensor constructed to receive desired and interference signals;
a plurality of auxiliary channel sensors spaced about said main channel sensor and constructed to receive primarily interference signals;
canceller means coupled to said main and auxiliary channel sensors for cancelling interference from said main channel signals and providing a main channel output; and
positioning means coupled to at least one of said auxiliary channel sensors and responsive to said main channel output for positioning said at least one auxiliary channel sensor relative to said main channel sensor such as to provide improved interference cancellation in said main channel output.
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Abstract
An improved interference cancelling system and technique for optimizing sal sampling, particularly in a side-lobe canceller system operating in a multiple signal environment. A plurality of auxiliary antennas provide samples of the interference environment for cancelling interference received by a main radar antenna. At least one of the auxiliary antennas is rotated in a circle in a horizontal plane for causing modulation of the interference residue. The component modulated with the frequency of rotation in the residue is compared in phase with the rotation modulation frequency to derive a signal for automatically moving the antenna to a position in the horizontal plane where the residue modulation is substantially eliminated. At that position the cancellation is maximized for the particular geometry of interference sources at that time.
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Citations
7 Claims
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1. An interference suppression system for cancelling interference from a multiple source environment comprising:
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a main channel sensor constructed to receive desired and interference signals; a plurality of auxiliary channel sensors spaced about said main channel sensor and constructed to receive primarily interference signals; canceller means coupled to said main and auxiliary channel sensors for cancelling interference from said main channel signals and providing a main channel output; and positioning means coupled to at least one of said auxiliary channel sensors and responsive to said main channel output for positioning said at least one auxiliary channel sensor relative to said main channel sensor such as to provide improved interference cancellation in said main channel output. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification