Patent ID: 6417796
Filing Date: 2002-07-09
Classification: G01S

Abstract:
A method for determining the speed of a selected moving target traveling in generally the same direction as a moving platform supporting a Doppler-based radar system and independent of the direction of the target relative to the platform comprising the steps of:transmitting a signal from the platform toward at least one target; receiving a return signal reflected from the at least one target, said return signal indicative of the speed of the at least one target including the platform; forming a test processing signal and a reference processing signal such that said processing signals are different in phase; transforming samples of said test and said reference processing signals into the frequency domain to provide at least one spectrum including a plurality of bins indicative of Doppler components of the at least one target; cross-correlating said Doppler components to provide a cross-correlation spectrum; selecting the moving target from said cross-correlation spectrum dependent upon a mode of operation of the radar system; determining a direction of the at least one target relative to the platform; calculating the speed of the selected moving target dependent upon the direction of the target; and displaying the speed of the selected moving target, whereby the speed of the selected moving target is determined independent of the relative direction of the target to the platform and of operator intervention.