Patent ID: 9444558
Filing Date: 2016-09-13
CPC Classification: H01Q,H04B,H04W

Claim Text:
1. A method for beamforming digitized individual signals from a sensor array to enhance signals originating from a preselected angle of interest and a preselected range bin while suppressing interference signals from other angles of arrival comprising: acquiring Ns snapshots of sensor array data; estimating an autocorrelation function for the range bin utilizing at least one of said Ns snapshpots; determining an autoregressive model of power over angles of arrival from the autocorrelation function as polynomial coefficients; calculating roots of the autoregressive model associated with the interference signals; ordering calculated roots of the autoregressive model by magnitude; determining the number of nulls needed to suppress interference signals; selecting roots based on the ordered calculated roots and the number of nulls determined; constructing complex exponentials from the selected roots; calculating dyads from the constructed complex exponentials; finding a variance utilizing the determined autoregressive model of power; weighting calculated dyads utilizing the variance; summing the dyads; diagonally weighting the summed dyads to produce a synthetic covariance matrix; and utilizing the synthetic covariance matrix to beamform the digitized signals by applying weights and delays to the individual signals.