Patent ID: 6594367
Filing Date: 2003-07-15
Classification: G10K,H01Q

Abstract:
A sensor array for receiving a signal that includes a desired signal and noise, comprising:a plurality of sensors; a plurality of filters for filtering the output of each sensor, each filter being defined by one or more filter coefficients; and a means for combining the outputs of said filters to form a sensor array output signal; wherein said filter coefficients are adaptively determined so as to maximize the signal to noise ratio of the array output signal, and wherein upon the occurrence of a predetermined event the adaptive determination of said filter coefficients is stopped and said filter coefficients are faded into a predetermined set of fixed coefficients; the fixed filter coefficients being determined by solving directly and non-adaptively an equation wopt=C-1&it;vvC-1&it;vâ€ƒwhere C is the noise covariance matrix, v is the steering vector toward the array look direction, and wopt is a vector having a number of components equal to the number of sensors, and where solving said equation for â€œnâ€  frequencies provides â€œnâ€ coefficients for each filter.