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:
Jun. 29, 1976
Filed:
Oct. 23, 1974
Walter E Buehler, Issaquah, WA (US);
George W Fitzsimmons, Lynwood, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
In an instrument landing system (ILS), an aircraft is provided with apparatus for receiving from a ground-based transmitter overlapped modulated beam signals, which, when processed by the receiver, provide information about the position of the aircraft relative to a desired navigation course. Provided in the aircraft receiver apparatus is an antenna for receiving the transmitted beam signal, and an RF amplifer for amplifying the received signals. The received signal energy is divided between two recovery lines, each recovery line being routed near a separate series of ring filters, with the ring filters adjacent one recovery line substantially eliminating the signal energy in that line associated with one of the beams, and the ring filters adjacent the other recovery line substantially eliminating the signal energy in that line associated with the other beam. The remaining signals in each recovery line are then detected and applied through follow-on amplifying and filtering circuits to visual indicators for display of ILS information.