Title:
NAVIGATION APPARATUS
Document Type and Number:
Japanese Patent JPH04204215
Kind Code:
A
Abstract:
PURPOSE:To reduce the measuring error due to drift by performing the offset cancel of an optical fiber gyroscope at each time when a moving body straightly advances or stops. CONSTITUTION:A moving body to be navigated is loaded with an earth magnetism sensor 1, an optical fiber gyroscope 2, a speed sensor 3, a map data providing apparatus 4 and a CPU 5. A means 6 (offset cancel means 6) judging the straight advance of the moving body by the optical fiber gyroscope 2 and the map data providing apparatus 4 and judging the stop of the moving body by the speed sensor 3 to perform the offset cancel of the optical fiber gyroscope 2 when the moving body is straightly advanced or stopped is incorporated in the CPU 5 in a software fashion. The offset cancel means 6 brings the light source of the optical fiber gyroscope 2 to an OFF-state when offset cancel is performed to eliminate the function as a sensor and functions so as to measure only the offset voltage of an electronic circuit.
Inventors:
KUMAGAI TATSUYA
KAJIOKA HIROSHI
IIZUKA TOSHIO
KAJIOKA HIROSHI
IIZUKA TOSHIO
Application Number:
JP33788090A
Publication Date:
July 24, 1992
Filing Date:
November 30, 1990
Export Citation:
Assignee:
HITACHI CABLE
International Classes:
G01C21/00; (IPC1-7): G01C21/00
Attorney, Agent or Firm:
Nobuo Kinutani