The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1986
Filed:
Apr. 26, 1984
Earnest R Harrison, Jr, Severna Park, MD (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
An adaptive filter for enhancing the discrimination of targets from clutter and noise and suitable for use in a pulse doppler radar signal processor which processes successive echo pulse period signalling in accordance with range cell samples is disclosed. One embodiment of the filter has a delayed lattice configuration including a plurality of cascadedly coupled lattice stages, each adapted to operate on the range cell samples of first and second complex signal inputs. The adaptive filter embodiment provides rapid and low cost updating of the lattice stage weighting coefficients so that varying clutter spectrums may be effectively dealt with. Moreover, the lattice filter embodiment is insensitive to average clutter motion and to transmitter phase and gain instabilities. It further permits the use of variable interpulse period operation in radars that are unambiguous in range. Furthermore, the lattice filter embodiment adapts to and whitens the actual clutter spectrum being received by the radar and not some model spectrum that may be quite inaccurate.