Title:
EARTH SENSOR
Document Type and Number:
Japanese Patent JP3036487
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable stable angle measurement of high precision without causing mechanical resonance, and realize a small-sized and light-weight apparatus, by constituting an infrared radiation detector of a plurality of pixels arranged at specified intervals in the scanning direction of a substrate and in the direction perpendicular to the scanning direction.
SOLUTION: An infrared radiation detecting element (infrared radiation detector) 11 is arranged on a substrate 31 on which an image I of earth is formed, and detects the image I. This detector is constituted by arranging a plurality of pixels 32 at specified intervals, in the east west(E-W) direction (electron scanning directon) as the pitch angle measuring direction of the substrate 31, and in the north south(N-S) direction (direction perpendicular to the scanning direction). The center C of the detecting element 11 is made to coincide with the optical axis of an earth sensor, the number of pixels from the pixel 32c at the center C to the pixels 32w of the west end is counted, and a pixel output θw is obtained. In the same manner, the number of pixels from the pixels 32c to the element 32E of the east end is counted, and a pixel output θE is obtained. From the pixel outputs θE, θW, a pitch angle θP is obtained. From the pixel output θN, θS, a roll angle θR is obtained.
Inventors:
Hideaki Koyama
Application Number:
JP28089197A
Publication Date:
April 24, 2000
Filing Date:
October 14, 1997
Export Citation:
Assignee:
NEC
International Classes:
G01C21/24; B64G1/36; G01C1/00; G01C21/02; (IPC1-7): G01C21/24; B64G1/36; G01C1/00
Domestic Patent References:
| JP54103073A | ||||
| JP58194698A |
Attorney, Agent or Firm:
Nobuo Takahashi (3 outside)