Jammer counting using cholesky factor diagonal elements
AssigneeLockheed Martin Corporation
InventorRalph Thomas Hoctor
Life of this patent
Estimating the term…
Abstract
A method and system for using the main diagonal elements of the Cholesky factor of the spatial covariance matrix to estimate the number of jammers present, by evaluating the AIC (or other) test function using the Cholesky diagonal elements in place of covariance eigenvalues. The Cholesky factor is often available as a by-product of adaptive beamforming.
Claims20
A method of estimating the number of interfering signals in a received signal from a radar antenna array, comprising the steps:
- estimating the Cholesky factor decomposition of the covariance matrix from the received signal;
- and
- using said estimate of the Cholesky factor to obtain a count of the number of interfering signals in the radar signal.
A system for estimating the number of interfering signals in a received signal from a radar antenna array, comprising:
- means for estimating the Cholesky factor decomposition of the covariance matrix from the received signal;
- and
- means for using said estimate of the Cholesky factor to obtain a count of the number of interfering signals in the radar signal.
A program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for estimating the number of interfering signals in a received signal from a radar antenna array, said method steps comprising:
- estimating the Cholesky factor decomposition of the covariance matrix from the received signal;
- and
- using said estimate of the Cholesky factor to obtain a count of the number of interfering signals in the radar signal.
A processor having software embedded in the processor for operating the processor to estimate the number of interfering signals in a received signal from a radar antenna signal, said software in the processor comprising:
- means for estimating the Cholesky factor decomposition of the covariance matrix from the received signal;
- and
- means for using said estimate of the Cholesky factor to obtain a count of the number of interfering signals in the radar signal.
Dependencies are inferred from the claim text.