MTI compatible coherent sidelobe canceller
First Claim
1. An interference suppression system for use in high clutter environments comprising:
- main channel means for receiving desired and interference signals and providing a main channel signal;
auxiliary channel means for receiving primarily interference signals and providing an auxiliary channel signal;
first means coupled to said main and auxiliary channel means for correlating the interference signals to produce a first weighting function;
second means coupled to said main and auxiliary channel means for correlating the interference signals to produce a second weighting function;
third means coupled to said first and second means for providing an instantaneous weighting function proportional to said first and second functions;
means coupled to said providing means and said auxiliary channel means for translating an auxiliary channel signal with said instantaneous weighting function to provide a cancelling signal;
means coupled to said translating means and said main channel means for subtracting said cancelling signal from said main channel signal to thereby reduce interference.
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Abstract
A system for instrumenting time sampled interference suppression, particuly in a side-lobe canceller system. Interference signals are sampled just before a radar transmits on command of a sample gate or radar pulse, with main and auxiliary channel signals being delayed by the time between two successive samples. The two samples are then combined to allow interpolation such that weighting functions can be formed to adjust the delayed auxiliary signal so that interference in the delayed main channel signal can be suppressed at all times. By sampling just prior to radar transmission and interpolating between samples, cross modulation of clutter, and antenna scan error can be reduced in order that a side-lobe canceller system may be used compatibly with Moving Target Indicators (MTI).
45 Citations
10 Claims
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1. An interference suppression system for use in high clutter environments comprising:
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main channel means for receiving desired and interference signals and providing a main channel signal; auxiliary channel means for receiving primarily interference signals and providing an auxiliary channel signal; first means coupled to said main and auxiliary channel means for correlating the interference signals to produce a first weighting function; second means coupled to said main and auxiliary channel means for correlating the interference signals to produce a second weighting function; third means coupled to said first and second means for providing an instantaneous weighting function proportional to said first and second functions; means coupled to said providing means and said auxiliary channel means for translating an auxiliary channel signal with said instantaneous weighting function to provide a cancelling signal; means coupled to said translating means and said main channel means for subtracting said cancelling signal from said main channel signal to thereby reduce interference.
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2. The system of claim wherein said second means comprises, a delay means coupled to said main and auxiliary channel means for delaying said channel signals by a time period τ
- and a means coupled to said delay means for correlating the delayed interference signals to produce said second weighting function delayed from said first function by said delay period.
- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
Specification