초록 ▼

Wave-number-frequency adaptive beamforming using a reduced rank k-.omega. matrix method. A spatial Fourier transform of the narrowband receiver outputs for the sensors in a linear array is taken to enter the wave number space and generate M independent spatial wave number beams w. The spatial FFT ou

Wave-number-frequency adaptive beamforming using a reduced rank k-.omega. matrix method. A spatial Fourier transform of the narrowband receiver outputs for the sensors in a linear array is taken to enter the wave number space and generate M independent spatial wave number beams w. The spatial FFT outputs are used to form the entries in a matrix of eigenvectors, wherein the k-th eigenvector represents a set of spatial convolution coefficients. The spatial wave number beams are weighted in an adaptation process by the spatial convolution coefficients to form a beam steered in the direction of a k-th signal source.

대표청구항 ▼

[ What is claimed is:] [1.] A method for wave-number-frequency adaptive beam forming using the sensor outputs from a linear array of sensors, comprising the following steps:performing a spectral Fast Fourier Transform (FFT) on time samples of the sensor outputs for each sensor to produce frequency b

[ What is claimed is:] [1.] A method for wave-number-frequency adaptive beam forming using the sensor outputs from a linear array of sensors, comprising the following steps:performing a spectral Fast Fourier Transform (FFT) on time samples of the sensor outputs for each sensor to produce frequency bin outputs;performing a spatial FFT across the sensors at a given frequency bin to enter the wave number space and generate Nw independent spatial wave number beams;selecting a subsample of spatial FFT outputs based on frequency and then selecting a subsample of spatial FFT outputs based on frequency and then forming a cross-covariance matrix from the spatial wave number beams;performing an eigenvalue decomposition of the cross-covariance matrix to determine a set of eigenvectors; andapplying the set of eigenvectors as weights to the spatial wave number beams to form output beams.