Patent ID: 6809681
Filing Date: 2004-10-26
Classification: G01S

Abstract:
A method for processing a radar return signal in a radar system in which a radar modulation signal is employed to estimate the range and velocity of a target, said method comprising the steps of:correlating said radar modulation signal with said radar return signal to obtain a demodulated return signal; obtaining a first Fourier Transform of said demodulated return signal for each of a plurality of time intervals corresponding to a plurality of target range cells, each said first Fourier Transform corresponding to a Doppler shift spectrum representing the estimated radar return signal power distribution over a plurality of target velocity cells at one of said plurality of target range cells; correlating said radar modulation signal with itself to obtain a transmit modulation autocorrelation signal; obtaining a second Fourier Transform of said transmit modulation signal for each of said plurality of time intervals, each said second Fourier Transform corresponding to a Doppler shift spectrum representing the uncorrelated range cells; estimating the clutter modulation noise power in each said target range and velocity cell for said at least one clutter source by combining each said second Fourier Transform with at least one peak value of said estimated radar return signal power distribution; and subtracting said clutter modulation noise power estimate from the corresponding said radar return signal power estimate to obtain an enhanced radar signal power estimate for said each target range and velocity cell.