Wideband interference cancellation using DSP algorithms
First Claim
1. A method for extracting information in the presence of interference comprising the steps of:
- applying a first signal to a plurality of discriminators to obtain successive digitized vectors representative of the first signal;
deriving a sequence of data covariance matrices from at least some of the digitized vectors; and
generating desired information by processing the sequence of covariance matrices using dominant mode prediction.
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Abstract
A method and system is provided for detecting and characterizing pulsed threat radar emitters through heavy in-band interference. System includes an advanced digital signal processing method provides spatial and temporal interference cancellation, super-resolution direction-finding, and high resolution spectrum analysis techniques. The system receives the digitized output of a discriminator bank and produces highly accurate threat pulse radio frequency estimates. The invention further provides a two-channel configuration for a DF subsystem, to perform adjacent-beam direction-finding through severe interference environments. The invention provides increased sensitivity, increased frequency accuracy, and up to 40 dB of increased interference look-through capability in ES system but remains transparent to ES system functioning and to ES system operators.
82 Citations
28 Claims
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1. A method for extracting information in the presence of interference comprising the steps of:
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applying a first signal to a plurality of discriminators to obtain successive digitized vectors representative of the first signal; deriving a sequence of data covariance matrices from at least some of the digitized vectors; and generating desired information by processing the sequence of covariance matrices using dominant mode prediction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for canceling interference, comprising:
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a plurality of discriminators configured to generate a series of digitized vectors of an autocorrelation function for a signal; and one or more dominant mode prediction processors adapted to cancel interference associated with the signal, wherein the interference is cancelled by application of a plurality of signal processing algorithms to the series of digitized vectors. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A dual-zoom instantaneous frequency measurement dominant mode prediction system, comprising:
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a first bank of discriminators adapted to receive a signal and to provide a first series of digitized vectors of an autocorrelation function based on a first set of time delays; a second bank of discriminators adapted to receive the signal and to provide a second series of digitized vectors of an autocorrelation function based on a second set of time delays and; a plurality of dominant mode prediction processors adapted to perform signal processing algorithms on the first series of digitized vectors to obtain a first information associated with the signal and further adapted to perform signal processing algorithms on the second series of digitized vectors to obtain a second information associated with the signal; one or more combining processors configured to receive the first information and the second information and to produce combined information. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification