JPS61122100A - Solar sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sun sensor that detects the sun and generates all attitude information for attitude control of an artificial satellite.

[Conventional technology]

FIG. 5 is a configuration diagram of a conventional solar sensor. In FIG. 90, (1) is sunlight and (2; is the head of the solar sensor.

(3) is the solar cell through which sunlight (1) passes), (41 is the solar cell, (5) is the part where sunlight passes through the slit (3), and (6) is the current signal from the solar cell (4). , (7) is a signal processing circuit that processes this current signal (6) and calculates the incident angle of sunlight (11), and (8) is a cable that sends this angle signal to other equipment.

A conventional solar sensor is configured as described above. For example, when sunlight (1) enters the solar sensor (2ν) from the front, the sunlight (1) has the same amount of light on two solar cells (4). Also, as shown in the figure, if sunlight +11 passes through at a certain angle of incidence (3Jt-), there will be a difference in the amount of light hitting the two solar cells (4). The output (6) of the battery is sent to the □ signal processing circuit (7), and this processing circuit calculates the incident angle of sunlight (1).

The angle signal determined here is sent to other equipment via the cable (8).

Next, according to Figure 6, 2 due to the difference in the incident angle of sunlight (1)
Changes in the output of the two solar cells and the internal operation of the signal processing circuit will be explained. (,) The figure shows the change in the output of two solar cells (4) with respect to the incident angle of sunlight (1), with the horizontal axis representing the incident angle and the vertical axis representing the output of the solar cells.
(4a) and (4b) are graphs of changes in the output values of the two solar cells. In this figure, for example, when sunlight (1) enters from the front (Odeg), the output value of the two solar cells is (A), and the two output values (aa)
, (4b) are equal. Also, when the incident angle is α, the value of the output (4a) of one solar cell is (B),
The other output value (4b) is (C).The outputs of the two solar cells change as shown in (a) as the incident angle changes. (b) is a diagram showing the output signal from the signal processing circuit, where the horizontal axis is the incident angle of sunlight and the vertical axis is the angle signal. (4c) is a graph showing the angular output signal corresponding to the solar incident angle. It has become. The function of the signal processing circuit is (a
) Output of two solar cells shown in the figure (4a), (4b)
Angle signal (4c) corresponding to the solar incident angle k
It is to output. The basic relationship between the output of the solar cell and the angle signal is shown in equation (1).

4c=K (4b-4c) (11(1)
In the formula, (K) is the gain when the current output from the solar cell is amplified.

[Problem J to be Solved by the Invention The conventional solar sensor as described above can only obtain an angle signal centered on the longitudinal direction of the slit (3), that is, can only detect attitude information on the -axis.

In order to obtain attitude information on two axes, it is necessary to prepare another identical solar sensor and arrange the slits so that they are 90 degrees apart from each other to detect the two axes, which poses a problem. Ta.

The present invention was made to solve these problems, and an object of the present invention is to obtain a solar sensor that can obtain biaxial attitude information using one sensor head.

[Means for solving problems]

In the solar sensor according to the present invention, two 9-circular slits are constantly rotated by a drive device, and solar cells are arranged in a grid pattern.

[Effect]

In this invention, the direction of incidence of sunlight is selected using two rotating slits, and the position where this sunlight hits the solar cell is determined from the signal output from the solar cell elements arranged in a grid. The solar direction is determined from the position and the position of the optical slit where sunlight is incident, and two-axis attitude information is obtained.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention.
) is sunlight, (2) is a solar sensor, (3a) is a rotating slit disk, (5b) is a fl slit disk (
3a) is a slit disk with a different slit type, (4) is a solar cell with solar cell pieces arranged in a grid, (6) is a signal obtained by amplifying the current signal output from the solar cell, and (7) is a solar cell. A control processing circuit that processes the signal (6) from the battery and controls the rotation of the disk, (8) is a cable that outputs biaxial attitude information, and (9) is a drive device that rotates the two slit disks. , ill is an amplifier that amplifies the signal of the solar cell,
(1Oa) is a cable for sending signals from the control processing circuit (7) to the drive device (9).

In a solar sensor configured as described above.

The operation of the two slit disks that uniformly and sequentially send sunlight incident within the field of view of the solar sensor to the solar cells (4) according to its position will be explained using FIGS. 2 and 3.

The second [/(a) is the slit disk (3a).

In addition, Fig. 2 (b) is a diagram for explaining the slit disk (sb). In Fig. 2, (5a) and (5b) are slit disks, (Lυ is a slit that allows sunlight to pass through, and 13 is a The part where sunlight does not pass through, α3, is the rotation center of the slit disk.These two slit disks (3a) and (5b)
t” is shown in Figure 3. In Figure 3, +14
1 is the part where the two slits overlap and sunlight passes through, (l is the part where the two slits do not let light pass through. Rotate these two slit disks clockwise, and set the rotation speed to the If the disk in FIG. 2 (b) is made slower than the disk in (,) in FIG. 2, the portion I through which sunlight passes in FIG. 3 becomes the locus αe shown in FIG. 3 (b). The length of this trajectory depends on the difference in the rotational speed of the two discs, and an appropriate rotational speed is determined to detect all the sunlight sound within the field of view. , slit C3B in Figure 1)
, C3b) The light passing through fjr hits the solar cell (4). This solar cell is constructed as shown in Fig. 4, where (4) is a solar cell, (lTI is a solar cell piece, and the α frame is an insulating material that separates each solar cell piece. Surin) (3a), (3b
) 1 sunlight passes through the solar cell (
4) The solar cell (4) outputs a signal only at the part where sunlight hits the solar cell (4) at a different position.

The solar direction is determined by determining the position where sunlight has entered - the rotation angle of the two slits, and further calculating the position where sunlight has hit with the control processing circuit (7), and obtaining biaxial attitude information. Can be done.

〔Effect of the invention〕

As explained above, this invention uses two rotary slits as the slits through which sunlight passes, and further uses a solar cell with solar cell pieces arranged in a lattice pattern to form one solar senna with a single axis. It is possible to obtain a solar sensor that can detect all postures of the sun.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a solar sensor showing an embodiment of the present invention, Fig. 2 is a diagram showing two slit discs used in this invention, and Fig. 3 is a diagram showing the two discs shown in Fig. 2. Fig. 4 is a diagram showing the shape of the solar cell used in this invention, Fig. 5 is a diagram showing the configuration of a conventional sun sensor, FIG. 6 is a diagram showing a conventional attitude angle detection method of a sun sensor. In the figure, (1) is the sunlight, (2) is the head of the solar senna, (3) is the slit, (3a) is the slit with a different shape from the Tri slit (3), (3b) h
Slits (3), (5a) and different shapes)
, (41 is the solar cell I C'a) T (4b) is the output of the solar cell, (4c) is the output of the solar cell (4a)
#A signal indicating the solar incidence angle determined from (4b). (5) is the part where sunlight passes through the slit, (6J
is the output signal of the solar cell, (7) is the signal processing circuit, (8
1fl cable, (9) is the drive device, ! IG is the amplifier, (10i) is the cable, αυ is the part of the slit that passes sunlight, α2 is the part of the slit that does not pass sunlight,
α3 is the center of rotation of the slit, α4 is the part of the two slits that passes sunlight, aS is the part of the two slits that does not pass sunlight, aS is the locus of the part of the two slits that passes sunlight, ( lη is a solar cell piece, (IS is an insulating material. In Figure 1, the same or corresponding parts are indicated by the same reference numerals.

Claims (2)

[Claims] (1) Two rotating slits that allow sunlight to pass through, a drive device that rotates the slits, a lattice-shaped solar cell that detects sunlight that has passed through the slits, and an output signal of the solar cells. A solar sensor comprising: an amplifier for amplification; and a control processing circuit section for determining a sunlight incident angle from a signal from the amplifier and a rotation angle of the two slits. (2) The solar sensor according to claim (1), wherein the rotational speeds of the two slits are different.