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. 23, 1987
Filed:
Jun. 12, 1985
Koichi Mori, Tokyo, JP;
NEC Corporation, , JP;
Abstract
An antenna tracking device comprising an antenna which is so controlled in direction as to receive a plurality of beacon signals at different frequencies transmitted from a plurality of stationary satellites, respectively, which are spaced apart from each other by a relatively small distance, error detector connected to the feed of the antenna for detecting error signals each representing the difference between the incoming direction of each beacon signal and the axial direction of the main beam of the antenna, reference signal generator responsive to each beacon signal delivered to a receiver for generating a reference signal, and a tracking receiver which receives the reference signals and the error signals to generate the tracking error signals each consisting of mutually orthogonal components. The antenna tracking device of the type described above further includes synthesizer means for combining the components in the same directions of the tracking error signals from the tracking receiver, thereby generating the antenna driving signals. In response to these driving signals, the antenna is directed to the midpoint or center of a plurality of stationary satellites.