Patent ID: 6483923
Filing Date: 2002-11-19
Classification: G01S,G10K,H01Q,H04B

Abstract:
A method for processing digital input data representing signals containing a source signal from a signal source on-axis from an array of sensors as well as interference signals from interference sources located off-axis from the signal source and for producing digital output data representing the source signal with reduced interference signals relative to the source signal, comprising the steps of:generating a main channel from the digital input data, the main channel representing signals received in the direction of the signal source and having a source signal component and an interference signal component; generating at least one reference channel from the digital input data, each reference channel representing signals received in directions other than that of the signal source; adaptively filtering said at least one reference channel using filter weight values to generate a cancelling signal approximating the interference signal component in the main channel; generating the digital output data by subtracting the cancelling signal from the main channel; deriving new filter weight values so that the difference between the main channel and the cancelling signal is minimized; and truncating the new filter weight values to predetermined threshold values when each of the new filter weight values exceeds the corresponding threshold value.