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:
Apr. 09, 1996
Filed:
Mar. 22, 1994
James G Bull, Issaquah, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
A multiple-hypothesis, multipath-matched filter (10) is disclosed for use in combining multipath components of transmissions between, for example, an aircraft (12) and aircraft (14) through a multipath environment (16). Rather than sensing the characteristics of the environment and adjusting the multipath components accordingly, the disclosed filter is designed on the basis of several hypotheses concerning the differences in the path lengths traversed by the various multipath components, as well as the phase shift introduced into each. In a preferred arrangement, the path length differences .DELTA.R are assumed to be some integer multiple of the range gate setting .delta.R of a transmitter/receiver (28) included on the aircraft. The phase shifts .psi. are assumed to be either 0.degree. or 180.degree.. Although the hypotheses result in some attenuation of the resultant combined multipath signal R, when compared to an ideal filter (58), a significantly enhanced output is achieved without requiring detailed information about the environment. Both hardware and software implementations of the filter are disclosed.