JPH0277400A - Solar battery paddle driving control method for three axis stabilizing satellite - Google Patents

Abstract

PURPOSE:To improve solar directional accuracy by detecting the paddle rotating angle, calculating a solar sensor usable/unusable signal, and deciding the usable/ unusable state of a rotating angle deviation signal according to a tracking solar sensor in a paddle driving control circuit according to the above signal. CONSTITUTION:A paddle rotating angle detector 6 detects a paddle rotating angle as the relative angle between a satellite main body and a solar battery paddle. The paddle rotating angle is input to a solar sensor disable decision portion 7. The decision portion 7 decides whether the solar reflected light of the satellite wain body has any influence on tracking solar sensors 1, 2 or not. If it is within the range of exerting influence, a use stop signal is output, and if it is out of the range, a usable signal is output. At the time of the usable state, a paddle driving control circuit 8 is operated to rotate the solar battery paddle. Thus, directivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Denominator] The present invention relates to a solar battery paddle drive control system for a three-axis stable satellite.

[Conventional technology]

Figure 2 is a functional block diagram showing the solar paddle drive control system for a conventional three-axis stable satellite. In Figure 2, (1)
(2) is a tracking sun sensor 1 installed on the solar array paddle that measures the solar angle; (2) is a tracking solar sensor 2 installed on the solar array paddle that measures the solar angle; T3
1 is a tracking sun sensor 1 (1) and a tracking sun sensor 2
(2) is a solar presence generating part that generates a signal indicating that the solar angle is being measured; (4) is a sun sensor for persecution 1 (
1) and a rotation angular velocity generator that generates a solar array rotation angular velocity error signal based on the solar angle calculated from the tracking sun sensor 2 (2). Orbital angular velocity generator that generates signals for rotation.

(8) is a paddle drive control circuit that includes a solar presence generation unit (3), a one-rotation angular velocity generation unit (4), and an orbital angular velocity generation unit (5); (9) is a drive output from the paddle drive control circuit (8); wA drive pulse generation electronic circuit that generates pulses to drive the motor of the paddle drive mechanism based on signals (1
0) is a paddle drive mechanism that drives the solar battery paddle.

Next, a solar battery paddle drive control method using a tracking solar sensor will be explained. As shown in FIG. 2, the output of the tracking sun sensor takes the difference between the sun direction angle and the paddle rotation angle as a variable, and takes the shape of a mountain climber, and the output phases of the tracking sun sensors 1 and 2 are different.

Let the respective outputs be U, , U, U□+u2 is input to the solar presence generating section (3), and U, -U□ is input to the rotational angular velocity generating section (4). Solar presence generation part (3)
Then, the presence signal is changed from 0 to 1 when pU102 is above a certain value. The rotational angular velocity generator (4) outputs the paddle rotational angular velocity error Δω in a form that is approximately proportional to υ2"l as shown in Fig. 2. The paddle rotational angular velocity passed to the drive pulse generator * (91 The sum ω of the orbital angular velocity ω of the angular velocity generator (5) and Δω.
becomes ω. Note that when the solar presence signal is 0, that is, in the shade, zero is assigned to Δω. Drive pulse generation electronic circuit (9
) generates current pulses that drive the step morph of the paddle drive wJJ1a at pulse intervals that are inversely proportional to the input rotational angular velocity. Paddle drive! The l1I1 mechanism (1ω drives the paddle by a constant angle increment each time the current pulse is input. Therefore, the paddle rotation angle θ is the rotational angular velocity signal ω. This is the result of integrating Δω over time.

When a feedback loop is constructed with the signal flow shown in Fig. 2, the entire closed loop transfer function is in the form of a first-order lag filter. It is stable regardless of the magnitude of the proportionality coefficient.

[Problem to be solved by the invention]

In the conventional solar array paddle drive control method, the optical field of view of the solar sensor for tracking during sunlight is limited to the mission meter.

The mounting positions of the optic kidney and solar sensor are determined so that the satellite itself, including the antenna, etc., will not be damaged. this is.

When the main body of Nishiro Chueihara comes into view, the reflected light from the sun from the main body will enter the solar sensor, and the output from the reflected light from the satellite itself will be added to the solar sensor output, in addition to the output from the sun. Become.

This is because the solar sensor output includes an error, which causes an error in the solar orientation of the solar array paddle.

As satellites become larger, the number of protrusions such as antennas increases, and if you try to limit the field of view so that they do not enter the field of view of the solar sensor, you may not be able to secure a field of view in the original direction of the sun.

This invention has been made to solve the above-mentioned problems, and it is an object of the present invention to prevent errors from occurring in the sun pointing of the solar battery paddle even if the sun reflected from the satellite body enters the field of view of the sun sensor.

[Means to solve the problem]

A solar battery paddle drive control method according to the present invention is as follows.

It is equipped with an angle detector that is built into the solar array paddle drive mechanism and detects the paddle rotation angle, and a solar sensor usage/discontinuation determination unit that outputs a signal for use of the tracking sun sensor based on the solar array paddle rotation angle. Based on this, a signal indicating whether or not the sun sensor can be used is calculated, and in accordance with this signal, the paddle drive control circuit determines whether or not to use a signal corresponding to the rotational angular velocity deviation based on the tracking sun sensor.

[For production]

An angle detector that is incorporated in the solar battery paddle drive WIJ mechanism and detects the paddle rotation angle in the present invention is as follows.

Detect the paddle rotation angle as the relative angle between the satellite body and the solar array paddle. The angle of incidence of the solar reflected light from the satellite body onto the tracking solar sensor is uniquely determined by the paddle rotation angle. Therefore, by monitoring the paddle rotation angle, it can be determined whether the solar reflected light from the W1 star body affects the tracking sun sensor.

A sun sensor usage stop judgment unit is provided in the paddle drive control circuit, and when the paddle rotation angle τ at which the solar reflected light from the 1M star body affects the sun sensor is set to 141 from the τ amount, the paddle rotation angle τ is It outputs a stop signal when it is in the range from τ1 to τl+1.

When it is outside the range from τ1 to τ141, a usable signal is output. When the stop signal is issued, the paddle drive control circuit is operated to rotate the solar array paddle at orbital speed.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 is a functional block diagram showing the solar battery paddle drive control system for a three-axis stable satellite according to the present invention.
) to (5) and (9) to [alpha] are exactly the same as the solar battery paddle drive control system of the conventional three-axis stable satellite. (
6) Solar battery paddle drive! This is an angle detector that is incorporated into the l1lJ mechanism a and detects the paddle rotation angle. (7)
is the tracking solar sensor (11) from the rotation angle of the solar battery paddle.
, +21 is a sun sensor usage stop determination unit that outputs a usage permission signal. (8) is the solar presence generating part (3) 2
This is a paddle drive control circuit including a rotational angular velocity generating section (4), an orbital angular velocity generating section (5), and a sun sensor usage stoppage determining section (7).

Tracking sun sensor 1 (1) and tracking sun sensor 2 (2)
The difference U, -U, between the respective outputs U, , U, is proportional to the difference Δθ between the sun direction angle and the paddle rotation angle θ, and when the sun direction is ahead of the paddle rotation angle, U, -U, >O, the paddle rotational angular velocity becomes greater than the orbital angular velocity, and 1
Decrease Δθ1. Conversely, when the paddle rotation angle is ahead of the sun direction, U, -U, <O, and the paddle rotation angular velocity becomes smaller than the orbital angular velocity, making 1Δθ1 smaller. When the satellite is in the shade, the solar presence signal is zero and the paddle rotates at a constant orbital angular velocity.

The value range of the paddle rotation angle τ at which the solar reflected light from the satellite body affects the tracking sun sensor 1 (1) and the tracking sun sensor 2 (2) is from 11 degrees to 1141 degrees.

There may be multiple areas. In Figure 1, as two examples, assuming that reflected light from a large antenna attached to a satellite affects the solar sensor around two locations where the paddle rotation angle τ is 0° and 180°, the paddle rotation angle range is set to [0, τ1
], [τ2. There are two regions: τ,] and [τ,, 360°]. Here, <180'<τ3. τ is θ, 36
00 remainder representation.

When the IM star is in the sunshine state, the output τ of the angle detector (6) is in the above range [0, τ1], [τ2. τ3], [τ,, 360°
], the sun sensor usage stoppage determining unit (7) outputs 0, and Δω calculated by the two-rotation angular velocity generating unit (4) and ω of the orbital angular velocity generating unit (5). are added and ω. A paddle rotation rate of 10Δω is fed into the drive pulse generation electronics (9). Since Δω is calculated to reduce 1Δθ1, the paddle cell surface is controlled to face the sun.

Next, τ is [0, τ1], [τ2. τ3], [τ,,3
606), the sun sensor use stop judgment unit (7) outputs 1, ignores Δω, and the drive pulse generation electronic circuit 1 (9) is determined by the orbital angular velocity generation unit (5) ω. .

send in. Since the satellite rotates in inertial space at an orbital angular velocity, the relative angle Δθ between the paddle surface and the sun remains constant and does not change. Also, when the satellite is in the shade, the paddle has an orbital angular velocity of ω. The relative angle Δθ between the paddle surface and the sun remains constant and does not change.

By performing paddle drive control as described above.

Even if the solar reflected light from the satellite itself affects the tracking solar sensor, the paddle cell surface can point toward the sun without causing any control errors.

〔Effect of the invention〕

As described above, according to the present invention, the logic of whether or not the tracking sun sensor data can be used in the angle detector (6) and the sun sensor usage stop judgment unit (7) allows the solar reflected light from the star body to be reflected from the tracking sun. When influencing the sensor, paddle drive control can be performed without using solar sensor data, which has the effect of reducing field of view constraints on the tracking sun sensor.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing an embodiment of the present invention, and FIG. 2 is a functional block diagram of a conventional paddle drive control system. In the figure, (1) is the tracking sun sensor 1, +21
[31 is the solar presence generating part.] (4) is a rotational angular velocity generating section, and (5) is an orbital angular velocity generating section. (6) is the angle detector, (July sun sensor use stop judgment unit. (8) is the paddle drive control circuit, (9) is the drive pulse generation electronic circuit, (1 (11 is the paddle drive A81 structure. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] A tracking sun sensor 1 and a tracking sun sensor 2 that are installed on a solar array paddle of a three-axis stable satellite and measure the solar angle;
an angle detector that is incorporated into the solar battery paddle drive mechanism and detects the paddle rotation angle; and a solar presence generator that generates a signal indicating that the tracking sun sensor 1 and the tracking sun sensor 2 are measuring the solar angle; A rotation angular velocity generation unit that generates a solar battery paddle rotation angular velocity error signal based on the solar angle calculated from the tracking sun sensor 1 and the tracking sun sensor 2; A paddle drive control circuit that includes an orbital angular velocity generation section that generates a signal, a solar sensor usage discontinuation judgment section that outputs a usability signal for the tracking sun sensor based on the rotation angle of the solar battery paddle, and a drive signal that is output from the paddle drive control circuit. It is composed of a drive pulse generation electronic circuit that generates pulses to drive the motor of the paddle drive mechanism based on the above, and a paddle drive mechanism that drives the solar array paddle. A solar battery paddle drive control method for a three-axis stable satellite, characterized in that when a hailstorm occurs, the use of a tracking sun sensor signal is stopped by the operation of a sun sensor use stop judgment unit.