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:
Jan. 23, 1990
Filed:
Nov. 03, 1988
Elbert L Cole, Jr, Catonsville, MD (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A method and apparatus for prefiltering received target and fruit replies to filter out more obvious occurrences of fruit replies in an air traffic control system. A detector detects reply signals occurring during sweeps of a radar. After each sweep of the radar, the sweep interval is scanned for the occurrences of reply signals. If a received reply is repeated in any of a predetermined number of successive sweep intervals, then standard sequential observer detection is performed on a larger predetermined number of beam sweeps. If, however, the received reply is not repeated in any of the beam sweeps of the first window, then the signal is considered to be a fruit signal and is discarded.