JPS60115806A - Attitude detecting sensor consisting of optical fiber and two-dimensional solid-state image pickup element - Google Patents

Abstract

PURPOSE:To widen a visual field, to eliminate the need for a complex optical system to reduce the size of a device, and to facilitate output signal processing by detecting an attitude angle by utilizing optical fibers and a two-dimensional solid-state image pickup element. CONSTITUTION:Optical fibers 1 are arranged on part of a spherical surface or hemispherical surface radially from the center of the sphere, and the two-dimensional solid-state image pickup element 2 is connected to the fibers 1. Then, a means which performs photoelectric conversion by the element 2 and a means 4 which makes the positions of the fibers 1 arranged on the spherical surface to correspond to optical fiber connections with photodiodes of the element 2 are provided. Then, the direction of a light input is detected from the output of the one-to-one corresponding means 4 to detect the attitude angle of a satellite. Thus, the visual field is widened and the optical fibers are used to eliminate the need for an optical system such as a lens system and to attain size and weight reduction; and weighting calculation is further performed in signal processing to perform high-precision angle detection.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to an optical fiber and a λ-dimensional optical fiber connected thereto. be.

(b) Prior Art In conventional sensors of this type, for example, solar sensors, it has been necessary to arrange a plurality of photodiodes and condensing devices with limited directivity.

For this reason, there are disadvantages in that the device becomes bulky, heavy, and output signal processing between a plurality of sensors becomes complicated.

In particular, when mounting on a satellite is considered, the viewing angle that can be covered is limited in terms of mounting space and the like. Furthermore, if the satellite moves abnormally, light input may easily disappear from within its field of view, and the attitude of the satellite may become unclear.

(C) Purpose of the Invention The present invention has been made to eliminate these drawbacks. Therefore, the purpose of the present invention is to provide a wide field of view that can cover the entire hemisphere (or any shape as long as it is part of a spherical surface). By using optical fibers, there is no need for optical systems such as lens systems, making it smaller and lighter, and by calculating the weighting in signal processing, it is possible to achieve high accuracy. An object of the present invention is to provide a new attitude detection sensor that also enables angle detection.

Another object of the present invention is to provide a novel attitude detection sensor that can remove reflected light from the earth, etc. other than the sun, through signal processing by utilizing the difference in intensity with sunlight and its spread9. There is a particular thing.

(d) Structure of the Invention In order to achieve the above object, the attitude detection sensor according to the present invention comprises optical fibers arranged radially at equal intervals from the center of the sphere on a part of a spherical surface or on a hemispherical surface, and the optical fibers. a one-dimensional solid-state image sensor connected to the one-dimensional solid-state image sensor, a means for photoelectrically converting optical input by the one-dimensional solid-state image sensor, a position of the optical fiber arranged in a spherical shape, and a photodiode section of the -dimensional solid-state image sensor; and a means for one-to-one correspondence of optical fiber connections to the satellite, and is characterized in that the attitude angle of the satellite is detected by detecting the optical input direction from the output of the one-to-one correspondence means.

(θ) Practical Example of the Invention Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

Embodiments of the present invention are shown in FIGS. 1-V.

As shown in Figure 1, the optical fiber opening is arranged with the envelope surface of the hemisphere, and in order to equalize the loss caused by the fibers in the middle, the fibers are of equal length, as shown in Figure 3. is input to the photoelectric conversion surface of the λ-dimensional solid-state image sensor.

As shown in the first part, if the aperture area of the fiber 1 is 8, the 7-eye fiber having an angle θ with respect to the parallel input light and the fiber facing directly have an angular dependence of cos θ. Therefore, angle information of incident light can be obtained at the maximum value of the output of the solid-state image sensor. Historically, the efficiency can be improved by weighting the output near the maximum value using signal processing.

FIG. 1 is a block 1ia configuration diagram showing an embodiment of the present invention, where l indicates an optical fiber, C indicates a solid-state image pickup device, 3 indicates an amplifier, Da indicates a solid-state image pickup device drive section, and S indicates a processing section. .

The input light of the optical fiber is photo-electrically converted by the solid-state imaging device, amplified by the amplifier 3, and then input to the signal processing section S. As mentioned above, the angle information for the optical fiber is the output level difference of the solid-state image sensor and the H (horizontal direction) of the pixel.
It is obtained as V (vertical direction) address information. That is,
By associating the angle of the opening direction of the optical fiber with respect to the hemispherical envelope with the perpendicular line from the surface on which the optical fiber is installed as a reference, and the H and V addresses of the pixels, light input to the satellite (for example, sunlight ), it becomes possible to detect the posture.

Regarding anti-pollution light, especially background light, if the light is uniform and has a width of 9 compared to sunlight, the level of the output of the solid-state image sensor in the processing circuit S. Removal is possible by identifying differences and distribution spreads.

(f) Effects brought about by the invention As explained above, the present invention has the advantage that it has a large field of view and does not require a complicated optical system because it is an attitude detection sensor that uses an optical fin (and a one-dimensional solid-state image sensor). has.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the optical fiber arrangement according to the present invention, FIG. 2 is a diagram showing the angular dependence of the optical input to the optical fiber, and FIG.
The figure shows the correspondence between the spherical alignment of optical fibers and the optical fiber connection to the photoelectric conversion section of the two-dimensional object image sensor (A of optical fiber group 1 is connected to a of the two-dimensional object image sensor 2). (H center, ■ center), B is connected to b), FIG. 4 is a block diagram showing an embodiment of the apparatus according to the present invention. 1... Optical fiber group, 2... Two-dimensional object palpitation sensor,
3... Amplifier, 4... Two-dimensional object image sensor drive unit,
5...Signal processing unit patent applicant NEC Corporation Representative Patent attorney Yutabe Kumagai / Diagram 4

Claims (1)

[Claims] Optical fibers arranged radially at equal intervals from the center of the sphere on a part of a sphere or a hemisphere, and connected to this optical fiber.
means for photoelectrically converting optical input by the one-dimensional solid-state imaging device; and means for photoelectrically converting optical input by the one-dimensional solid-state imaging device; an optical fiber and one-dimensional means for one-to-one correspondence of the optical fiber connection, and detecting the attitude angle of the satellite by detecting the optical input direction from the output of the one-to-one correspondence means. Attitude detection sensor using a solid-state image sensor.