Title:
LATITUDE METER
Document Type and Number:
Japanese Patent JPH01143913
Kind Code:
A
Abstract:
PURPOSE:To easily measure latitude with simple constitution regardless of measurement conditions by measuring the latitude from a difference in sensitivity according to the revolution sensing ability of an optical gyro for the earth. CONSTITUTION:This instrument is set on a tripod stood on the equator 11 of the earth E so that the collimation axis of a telescope 4 is horizontal through a bubble tube 4a, and the meter is fixed through a leg 6 for fitting. Then an external frame 1 is rotated to find the position where a 1st gyro on a plane that the winding surface of the wound optical fiber of a 1st optical fiber gyro in the external frame 1 crosses at right angles in the revolving direction of the earth has zero sensitivity. Then an internal frame 3 is rotated along the inner periphery of the external frame 1 so that the ring center axes cross each other at right angles to find the position where a 2nd optical fiber gyro whose optical fiber winding surface is parallel to the revolving direction of the earth has the maximum sensitivity. Then similar operation is performed at latitude (h) and then the internal frame 3 rotates by variation in the perpendicular direction between the installation positions relatively to the external frame 1, so that the latitude is displayed on a scale 5 with an index 7.
Inventors:
KAYAMA YASUNAGA
TANAKA TOSHIHIRO
MOTOI HIDETAKA
INOUE ATSUSHI
TANAKA TOSHIHIRO
MOTOI HIDETAKA
INOUE ATSUSHI
Application Number:
JP30293687A
Publication Date:
June 06, 1989
Filing Date:
November 30, 1987
Export Citation:
Assignee:
NIKON CORP
International Classes:
G01C19/64; G01C19/00; G01C19/72; (IPC1-7): G01C19/00; G01C19/64
Attorney, Agent or Firm:
Takao Watanabe