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:
Feb. 18, 1992
Filed:
Apr. 11, 1989
Masahiro Uematsu, Otemachi, JP;
Tetsumi Harakawa, Otemachi, JP;
Ryuichi Hiratsuka, Otemachi, JP;
Kenji Ohmaru, Tokyo, JP;
Shigeru Yamazaki, Tokyo, JP;
Yasuhiro Ito, Tokyo, JP;
Isao Nemoto, Yachiyo, JP;
Kazuro Kato, Yachiyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Nemoto Project Industry Co., Chiba, JP;
Nippoon Hoso Kyokai, Tokyo, JP;
Abstract
Attitude control is implemented by detecting the phase difference between signals received by at least two antennas and detecting the angle of deflection between the direction of arrival of radio signals and the antenna beams. By using antennas that are separately driven, within the plane of rotation in which the deflection angle is to be detected, the phase of the received signals can be shifted equivalently to when the antennas are driven as a consolidated unit. Also, when at least three antennas are used in an orthogonal arrangement for detecting the deflection angle in two directions, the antennas are divided into two groups which are individually driven. This reduces the inertia of the moving parts and enables the size and weight of the drive mechanisms to be reduced. In addition, two orthogonal functions are used to represent the phase of the deflection angle of the direction of arrival of the radio wave and the antenna beam as a multiplicity of quadrants, and by storing these, when there is a change in the deflection angle, the sequence of change can be traced back and the control effected accordingly. This enables error to be eliminated.