System for processing returns from a target from transmissions containing repeated signals to detect the doppler velocity of the target
AssigneeHydroacoustics Inc.
InventorDavid P. Hollinger
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Abstract
A signal processing system of reduced complexity over conventional banks of matched filters for each Doppler velocity of interest is responsive to a transmission which is in the form of a train of repeated Doppler invariant signals which are preferably phase continuous. The system utilizes a head end zero Doppler correlator and tapped delay line summer with summing nodes in cascade for each Doppler velocity of interest. The summer provides coherent sums indicative of the Doppler velocity of the target.
Claims7
A method for detection of the velocity of a target from return signals returned from the target in response to a transmission containing a plurality of successively occurring Doppler invariant signals, said method comprising the steps of correlating said return signal with a replica of one of said Doppler invariant signals to obtain first output signals corresponding to the correlation of said return signals with said replica, progressively delaying said first output signals to provide a plurality of sets of said first output signals occurring in different time delay relationship, each relationship corresponding to a different velocity of said target, and coherently summing said first output signals in each set to provide a plurality of third outputs indicative of the velocity of said target.
Dependencies are inferred from the claim text.