JP6426524B2 - Satellite, storage angular momentum removal device and ground station device - Google Patents

Description

  The present invention relates to a technology for suppressing the occurrence of unloading of a reaction wheel by removing accumulated angular momentum of a satellite.

The satellite has a reaction wheel that rotates to stabilize the attitude of the satellite, and a thruster that changes the angular momentum of the satellite by injecting a propellant such as gas or ions. The wheel rotation number, which is the number of revolutions per unit time of the reaction wheel, increases with the increase in storage angular momentum of the satellite, and is called unloading, which reduces the wheel rotation number when the wheel rotation number reaches the upper limit. Is done. At unloading, the thruster jets the jet and the angular momentum of the satellite changes, and the stored angular momentum decreases with the change of the satellite angular momentum, and the wheel rotation speed decreases with the stored angular momentum Is reduced.
However, when the thruster ejects a jet, the attitude of the artificial satellite changes greatly momentarily. Then, until the attitude of the artificial satellite stabilizes, functions of the artificial satellite, such as a function of transmitting a positioning signal or a function of observing the earth, can not be used. Therefore, it is preferable not to unload the reaction wheel.

  Patent Document 1 discloses a technology for reducing the variation of the attitude of the satellite during unloading by controlling the direction of the solar cell paddle provided on the satellite when the wheel rotation speed reaches the upper limit. . However, even with this technology, the occurrence of unloading can not be suppressed.

Japanese Patent Application Laid-Open No. 60-8198

  An object of the present invention is to make it possible to suppress the occurrence of unloading.

The artificial satellite of the present invention is
A solar cell paddle having an axis of rotation;
Reaction wheel which rotates while changing the number of revolutions per unit time,
An adjustment angle calculation unit that calculates an adjustment angle for adjusting a paddle angle indicating an angle around the rotation axis of the solar cell paddle using a wheel rotation number that is a rotation number per unit time of the reaction wheel;
And a paddle driving unit configured to rotate the solar cell paddle around the rotation axis such that the paddle angle is changed by the adjustment angle.

  According to the present invention, the paddle angle of the solar cell paddle can be changed according to the wheel rotation speed. This removes the accumulated angular momentum of the satellite. Therefore, the wheel rotational speed does not increase to the upper limit, and the occurrence of unloading is suppressed.

FIG. 2 is a schematic view of the artificial satellite 210 in the first embodiment. FIG. 2 is a configuration diagram of a satellite 210 according to Embodiment 1. FIG. 2 is a hardware configuration diagram of the adjustment instruction unit 140 according to the first embodiment. 7 is a graph of accumulated angular momentum in Embodiment 1. FIG. 2 is a hardware configuration diagram of an accumulated angular momentum removal device 100 according to Embodiment 1. 6 is a flowchart of an accumulated angular momentum removal method according to Embodiment 1. FIG. 6 is a block diagram of a satellite system 200 according to a second embodiment. FIG. 10 is a functional configuration diagram of a ground station apparatus 230 according to Embodiment 2. FIG. 7 is a hardware configuration diagram of a ground station apparatus 230 according to Embodiment 2. FIG. 5 is a functional configuration diagram of an accumulated angular momentum removal device 100 according to a second embodiment. 6 is a flowchart of a correction coefficient update method according to Embodiment 2.

Embodiment 1
An artificial satellite in which occurrence of unloading of the reaction wheel is suppressed by removing accumulated angular momentum will be described based on FIGS. 1 to 6.

*** Brief Description ***
The outline of the artificial satellite 210 will be described based on FIG.
The artificial satellite 210 orbits the earth 201 with the communication antenna 213 for communicating with the communication device of the earth 201 and the positioning antenna 214 for transmitting a positioning signal to the earth 201 facing the earth 201. An example of the artificial satellite 210 is a quasi-zenith satellite having a function of transmitting a positioning signal.
In such a satellite 210, disturbance is generated by the influence of the solar radiation from the sun 202 and the geomagnetism from the earth 201 and the like. Then, the angular momentum is accumulated in the artificial satellite 210 by this disturbance force.
Therefore, the artificial satellite 210 minutely rotates the solar cell paddle 211 around the rotation axis 203 in order to remove the accumulated angular momentum. As a result, the accumulated angular momentum of the artificial satellite 210 is removed, and the occurrence of unloading of the reaction wheel provided to the artificial satellite 210 is suppressed.

*** Description of the configuration ***
The configuration of the artificial satellite 210 will be described based on FIG.
The artificial satellite 210 includes a solar battery paddle 211, a reaction wheel 212, a communication antenna 213, a positioning antenna 214, a thruster 215, a paddle driving unit 219, and the like.
The solar cell paddle 211 has a rotation axis 203 and rotates around the rotation axis.
The reaction wheel 212 stabilizes the attitude of the artificial satellite 210 by rotating while changing the number of rotations per unit time.
The communication antenna 213 is used to communicate with the communication device of the earth 201.
The positioning antenna 214 is used to transmit a positioning signal to the earth 201.
The thruster 215 changes the attitude of the artificial satellite 210 by injecting a propellant such as gas or ion.
The paddle driving unit 219 rotates the solar cell paddle 211 around the rotation axis such that the paddle angle is changed by the adjustment angle 131. The paddle angle indicates the angle around the rotation axis of the solar cell paddle 211. An example of the angle indicated by the paddle angle is an angle at which the plane of the solar cell paddle 211 is orthogonal to the sunlight vector. The adjustment angle of the paddle angle is also called bias of the paddle angle.

Furthermore, the artificial satellite 210 is provided with the accumulation | storage angular momentum removal apparatus 100 which suppresses the accumulation | storage of angular momentum.
The storage angular momentum removal device 100 includes an adjustment timing detection unit 110, a rotation speed acquisition unit 120, an adjustment angle calculation unit 130, an adjustment instruction unit 140, and a control storage unit 190.

The adjustment timing detection unit 110 detects, as an adjustment timing, the timing at which the adjustment time indicated by the adjustment time information 191 has come.
The adjustment time information 191 indicates the adjustment time for adjusting the paddle angle. The adjustment time is the time when the adjustment cycle has elapsed from the previous adjustment time. An example of the adjustment period is 24 hours, and an example of the adjustment time is 0 o'clock in the afternoon. Further, an example of the adjustment period is a period in which the artificial satellite 210 makes a round of the earth 201, and an example of the adjustment time is a time when the artificial satellite 210 passes the near point closest to the earth 201.

  The rotation speed acquisition unit 120 acquires a wheel rotation speed 121 which is the rotation speed per unit time of the reaction wheel 212.

When the adjustment timing is detected, the adjustment angle calculation unit 130 calculates the adjustment angle 131 for adjusting the paddle angle, using the wheel rotational speed 121, the adjustment constant 192, and the correction coefficient 193.
The adjustment constant 192 is a constant for making the amount of increase in angular momentum of the satellite 210 around the reference axis increase per adjustment period to zero. The reference axis is one axis that determines the attitude of the artificial satellite 210. An example of a reference axis is an axis in the same direction as a sunlight vector having a direction from the center of the sun 202 to the artificial satellite 210. The adjustment constant 192 is obtained by multiplying the reflectance at which the solar cell paddle 211 reflects solar radiation, the pressure of the solar radiation, and the area of the plane of the solar cell paddle 211.
The correction coefficient 193 is a coefficient for obtaining a correction amount. The correction amount is an amount by which the increase in angular momentum of the artificial satellite 210 about the reference axis increases per adjustment cycle from zero.

  The preferred adjustment angle 131 is an angle that makes the amount of increase in angular momentum of the artificial satellite 210 around the reference axis per correction period deviate from zero by a correction amount.

  The adjustment instruction unit 140 causes the paddle drive unit 219 to rotate the solar cell paddle 211 around the rotation axis so that the paddle angle forms an angle changed by the adjustment angle 131.

  The control storage unit 190 stores adjustment time information 191, an adjustment constant 192, a correction coefficient 193, and the like.

The hardware configuration of the adjustment instruction unit 140 will be described based on FIG.
The adjustment instruction unit 140 includes an adder 142 and a DA converter 143. DA is an abbreviation of digital-analog.
The adder 142 receives a digital signal indicating the adjustment angle 131 and a digital signal indicating the current paddle angle 141. Then, the adder 142 outputs a digital signal indicating the adjusted paddle angle 144 obtained by adding the adjustment angle 131 to the current paddle angle 141.
The digital signal output from the adder 142 is input to the DA converter 143. Then, the DA converter 143 converts the input digital signal into an analog signal, and outputs an analog signal indicating the adjusted paddle angle 144.

The paddle drive unit 219 includes a motor 145 that rotates the rotation shaft 203 of the solar cell paddle 211.
An analog signal indicating the adjusted paddle angle 144 is input to the motor 145. Then, the motor 145 rotates the rotation shaft 203 of the solar cell paddle 211 such that the paddle angle 141 of the solar cell paddle 211 forms the angle of the paddle angle 144 after adjustment.

The accumulated angular momentum of the artificial satellite 210 will be described based on FIG. 4. The accumulated angular momentum of the satellite 210 corresponds to the wheel rotational speed 121, and the wheel angular velocity 121 increases as the accumulated angular momentum of the satellite 210 increases.
(1) of FIG. 4 is a graph showing a change in accumulated angular momentum when the paddle angle is not adjusted. As shown in (1) of FIG. 4, when the paddle angle is not adjusted, the accumulated angular momentum increases with the passage of time.
(2) of FIG. 4 is a graph showing a change in accumulated angular momentum when the paddle angle is adjusted. As shown in (2) of FIG. 4, when the paddle angle is adjusted, an increase in accumulated angular momentum can be suppressed.
(A) of FIG. 4 is an enlarged view showing a part of (A) of (2) of FIG. 4, and (B) of FIG. 4 is an enlarged view showing a part of (B) of (2) of FIG. is there. As shown in (A) of FIG. 4 and (B) of FIG. 4, the paddle angle is adjusted such that the amount of increase in accumulated angular momentum per adjustment cycle deviates slightly from zero. An amount slightly deviated from this zero is taken as a correction amount. By adjusting the paddle angle in this manner, it is expected that the amount of increase in accumulated angular momentum per adjustment period converges to zero with the passage of time. That is, the correction amount decreases with the passage of time.

An example of the hardware configuration of the accumulated angular momentum removal device 100 will be described based on FIG. However, illustration and description of the hardware described in FIG. 3 will be omitted.
The storage angular momentum removal apparatus 100 is a computer including hardware such as a processor 901, an auxiliary storage device 902, a memory 903, and a communication device 904.
The processor 901 is connected to other hardware via a signal line 910.

The processor 901 is an IC that performs processing and controls other hardware. An example of the processor 901 is a CPU, a DSP, and a GPU. IC is an abbreviation for Integrated Circuit. CPU is an abbreviation for Central Processing Unit, DSP is an abbreviation for Digital Signal Processor, and GPU is an abbreviation for Graphics Processing Unit.
The auxiliary storage unit 902 stores data. An example of the auxiliary storage device 902 is a ROM, a flash memory, or an HDD. ROM is an abbreviation for Read Only Memory, and HDD is an abbreviation for Hard Disk Drive.
The memory 903 stores data. An example of the memory 903 is a RAM. RAM is an abbreviation of Random Access Memory.
The communication device 904 comprises a receiver 9041 for receiving data and a transmitter 9042 for transmitting data. An example of the communication device 904 is a communication chip, NIC. NIC is an abbreviation of Network Interface Card.

An OS is stored in the auxiliary storage device 902. OS is an abbreviation of Operating System.
Further, the auxiliary storage device 902 stores a program for realizing the function of “unit” such as the adjustment timing detection unit 110, the rotation speed acquisition unit 120, the adjustment angle calculation unit 130, and the adjustment instruction unit 140.
At least a part of the OS is loaded into the memory 903, and the processor 901 executes a program that implements the function of “unit” while executing the OS. A program for realizing the function of “part” is loaded into the memory 903, read into the processor 901, and executed by the processor 901.
Note that the storage angular momentum removal apparatus 100 may include a plurality of processors 901, and the plurality of processors 901 may cooperatively execute a program that realizes the function of “section”.

  Data, information, signal values, variable values and the like indicating the result of the processing of “part” are stored in the memory 903, the auxiliary storage device 902, a register in the processor 901, or a cache memory in the processor 901.

The "part" may be implemented by "circuitry". "Part" may be read as "circuit", "process", "procedure" or "treatment".
The “circuit” and “circuitry” are concepts including processing circuits such as the processor 901, logic IC, GA, ASIC, and FPGA. GA is an abbreviation for Gate Array, ASIC is an abbreviation for Application Specific Integrated Circuit, and FPGA is an abbreviation for Field-Programmable Gate Array.

*** Description of operation ***
The operation of the storage angular momentum removal device 100 corresponds to the storage angular momentum removal method. The accumulated angular momentum removal method corresponds to the processing procedure of the accumulated angular momentum removal program.

The accumulated angular momentum removal method will be described based on FIG.
S110 is adjustment timing detection processing.
In S110, the adjustment timing detection unit 110 refers to the adjustment time information 191 and stands by until the adjustment time is reached.
Then, the adjustment timing detection unit 110 detects the timing at which the adjustment time has come as adjustment timing.

S120 is a rotation speed acquisition process.
In S120, the rotation speed acquisition unit 120 receives a digital signal indicating the wheel rotation speed 121 from the reaction wheel 212, and acquires the wheel rotation speed 121 from the received digital signal.

S130 is adjustment angle calculation processing.
In S130, the adjustment angle calculation unit 130 calculates the adjustment angle 131 using the adjustment constant 192, the correction coefficient 193, and the wheel rotational speed 121 acquired in S120. The adjustment angle 131 is calculated by multiplying the adjustment constant 192 by the correction coefficient 193 and the wheel rotational speed 121.
Then, the adjustment angle calculation unit 130 generates a digital signal indicating the adjustment angle 131, and inputs the generated digital signal to the adjustment instruction unit 140.

S140 is adjustment instruction processing.
In S140, a digital signal indicating the adjustment angle 131 is input from the adjustment angle calculation unit 130 and a digital signal indicating the current paddle angle 141 is input from the paddle drive unit 219 to the adder 142 of the adjustment instruction unit 140. The adder 142 obtains the adjustment angle 131 from the digital signal indicating the adjustment angle 131, and obtains the current paddle angle 141 from the digital signal indicating the current paddle angle 141. Then, the adder 142 calculates an angle obtained by adding the adjustment angle 131 to the current paddle angle 141 as the adjusted paddle angle 144, generates a digital signal indicating the adjusted paddle angle 144, and generates the generated digital signal. Input to the DA converter 143 of the adjustment instruction unit 140.
The DA converter 143 of the adjustment instructing unit 140 converts a digital signal indicating the adjusted paddle angle 144 into an analog signal, and inputs an analog signal indicating the adjusted paddle angle 144 to the paddle driving unit 219. Thereby, the adjustment of the paddle angle 141 is instructed to the paddle drive unit 219. In the paddle driving unit 219 instructed to adjust the paddle angle 141, the motor 145 turns the paddle angle 141 of the solar cell paddle 211 to the adjusted paddle angle 144 by rotating the rotation shaft 203 of the solar cell paddle 211. .
After S140, the process returns to S110.

*** Description of the effect ***
The storage angular momentum removal device 100 can remove the storage angular momentum of the artificial satellite 210 by changing the paddle angle of the solar cell paddle 211 according to the wheel rotational speed 121. As a result, since the wheel rotation speed does not increase to the upper limit, the occurrence of unloading of the reaction wheel 212 is suppressed.

Second Embodiment
The form of updating the correction coefficient 193 will be described based on FIGS. 7 to 11. However, the description overlapping with that of the first embodiment is omitted.

*** Description of the configuration ***
The artificial satellite system 200 will be described based on FIG.
The satellite system 200 includes a satellite 210 and a ground station 220 provided on the ground.
The satellite 210 receives from the ground station 220 a request signal 222 requesting a status signal 223 including the wheel rotational speed 121, transmits the status signal 223 to the ground station 220, and a control signal 224 including a correction factor 193. It receives from the ground station 220.
Meanwhile, the ground station 220 transmits the request signal 222 to the artificial satellite 210, receives the status signal 223 from the artificial satellite 210, and transmits the control signal 224 to the artificial satellite 210.

  The ground station 220 includes an antenna 221 used for communication with the artificial satellite 210, and a ground station apparatus 230 that determines the correction factor 193 using the wheel rotational speed 121.

The functional configuration of the ground station apparatus 230 will be described based on FIG.
The ground station apparatus 230 includes a request signal transmission unit 231, a state signal reception unit 232, a correction coefficient determination unit 233, a control signal transmission unit 234, and a ground station storage unit 235.
The request signal transmission unit 231 transmits a request signal 222 requesting the status signal 223 to the artificial satellite 210.
The state signal receiving unit 232 receives the state signal 223 including the wheel rotational speed 121 from the artificial satellite 210.
The correction coefficient determination unit 233 determines the correction coefficient 193 used to calculate the adjustment angle 131 using the wheel rotation number 121 included in the state signal 223.
The control signal transmission unit 234 transmits the control signal 224 including the correction coefficient 193 to the artificial satellite 210.
The ground station storage unit 235 stores, for example, a correction coefficient table 236 in which a correction coefficient is associated with the wheel rotation number.

A hardware configuration example of the ground station apparatus 230 will be described based on FIG.
The ground station device 230 is a computer including hardware such as a processor 901, an auxiliary storage device 902, a memory 903, a communication device 904, an input interface 905, and an output interface 906.
The processor 901, the auxiliary storage device 902, the memory 903 and the communication device 904 are similar to the hardware provided in the storage angular momentum removal device 100.

The input interface 905 is connected to the input device 907 via the cable 911. Output interface 906 is connected to output device 908 via cable 912.
The input interface 905 is a port to which the cable 911 is connected, and an example of the port is a USB terminal. USB is an abbreviation for Universal Serial Bus.
The output interface 906 is a port to which the cable 912 is connected, and the USB terminal and the HDMI terminal are an example of a port. HDMI (registered trademark) is an abbreviation of High Definition Multimedia Interface.
An input device 907 inputs data, instructions and requests. An example of the input device 907 is a mouse, a keyboard, and a touch panel.
An output device 908 outputs data, results and responses. An example of the output device 908 is a display or a printer. An example of a display is an LCD. LCD is an abbreviation for Liquid Crystal Display.

In the auxiliary storage device 902, in addition to the OS, programs for realizing the functions of "unit" such as the request signal transmission unit 231, the state signal reception unit 232, the correction coefficient determination unit 233, and the control signal transmission unit 234 are stored. .
At least a part of the OS is loaded into the memory 903, and the processor 901 executes a program that implements the function of “unit” while executing the OS. A program for realizing the function of “part” is loaded into the memory 903, read into the processor 901, and executed by the processor 901.
The ground station apparatus 230 may include a plurality of processors 901, and the plurality of processors 901 may cooperatively execute a program that realizes the function of “section”.

  Data, information, signal values, variable values and the like indicating the result of the processing of “part” are stored in the memory 903, the auxiliary storage device 902, a register in the processor 901, or a cache memory in the processor 901.

  The "part" may be implemented by "circuitry". "Part" may be read as "circuit", "process", "procedure" or "treatment".

The functional configuration of the accumulated angular momentum removal device 100 will be described based on FIG.
The storage angular momentum removal device 100 includes a request signal reception unit 151, a state signal transmission unit 152, a control signal reception unit 153, a correction coefficient update unit 154, and an adjustment angle calculation unit 130.
The request signal reception unit 151 receives a request signal 222 requesting the status signal 223 from the ground station 220.
The state signal transmission unit 152 transmits the state signal 223 including the wheel rotational speed 121 to the ground station 220.
The control signal reception unit 153 receives a control signal 224 including the correction coefficient 193 from the ground station 220.
The correction coefficient update unit 154 updates the correction coefficient 193 stored in the control storage unit 190 to the correction coefficient 193 included in the control signal 224.
The adjustment angle calculation unit 130 calculates the adjustment angle 131 using the updated correction coefficient 193.

*** Description of operation ***

The correction coefficient update method will be described based on FIG.
S211 is a request signal transmission process.
In S211, when the operator operating the ground station apparatus 230 inputs a command instructing acquisition of the state signal 223 to the ground station apparatus 230, the request signal transmission unit 231 generates the request signal 222, and the request signal 222 is generated. It transmits to the artificial satellite 210 via the antenna 221.

S212 is a request signal reception process.
In S212, the request signal reception unit 151 receives the request signal 222 from the ground station apparatus 230 via the communication antenna 213.

S221 is a state signal transmission process.
In S221, the state signal transmission unit 152 receives a digital signal indicating the wheel rotation number 121 from the reaction wheel 212, and acquires the wheel rotation number 121 from the received digital signal.
Then, the state signal transmission unit 152 generates the state signal 223 including the wheel rotational speed 121 and transmits the generated state signal 223 to the ground station 220 via the communication antenna 213.

S222 is a state signal reception process.
In S222, the state signal reception unit 232 receives the state signal 223 from the artificial satellite 210 via the antenna 221.

S231 is a correction coefficient determination process.
In S231, the correction coefficient determination unit 233 acquires the wheel rotation speed 121 from the received state signal 223.
Then, the correction coefficient determination unit 233 selects, from the correction coefficient table 236, a correction coefficient associated with the same wheel rotation number as the acquired wheel rotation number 121. The selected correction factor is the determined correction factor 193.

S241 is a control signal transmission process.
In S241, the control signal transmission unit 234 generates a control signal 224 including the determined correction coefficient 193, and transmits the generated control signal 224 to the artificial satellite 210 via the antenna 221.

S242 is a control signal reception process.
At S 242, the control signal receiving unit 153 receives the control signal 224 from the ground station 220 via the communication antenna 213.

S251 is a correction coefficient update process.
In S251, the correction coefficient update unit 154 acquires the correction coefficient 193 from the received control signal 224, and updates the correction coefficient 193 stored in the control storage unit 190 to the acquired correction coefficient 193.
After S251, the process of the correction coefficient update method ends.

*** Description of the effect ***
The ground station 220 can determine the correction factor 193 in accordance with the wheel rotation speed 121 by transmitting the state signal 223 including the wheel rotation speed 121 to the ground station 220.
Then, the artificial satellite 210 can update the correction coefficient 193 by the ground station 220 transmitting a control signal 224 including the correction coefficient 193 to the artificial satellite 210.

Each embodiment is an illustration of a preferred embodiment, and is not intended to limit the technical scope of the present invention. Each embodiment may be partially implemented or may be implemented in combination with other embodiments.
The processing procedure described using the flowchart and the like is an example of the processing procedure of the storage angular momentum removal device, storage angular momentum removal method, and storage angular momentum removal program.

  100 storage angular momentum removal device, 110 adjustment timing detection unit, 120 rotation number acquisition unit, 121 wheel rotation number, 130 adjustment angle calculation unit, 131 adjustment angle, 140 adjustment instruction unit, 141 paddle angle, 142 adder, 143 DA conversion , 144 paddle angles, 145 motors, 151 request signal reception units, 152 status signal transmission units, 153 control signal reception units, 154 correction coefficient update units, 190 control storage units, 191 adjustment time information, 192 adjustment constants, 193 correction coefficients , 200 satellite system, 201 earth, 202 sun, 203 rotation axis, 210 satellite, 211 solar battery paddle, 212 reaction wheel, 213 communication antenna, 214 positioning antenna, 215 thruster, 219 paddle driving unit, 220 ground station, 221 antenna 222 request signal, 223 status signal, 224 control signal, 230 ground station apparatus, 231 request signal transmitter, 232 status signal receiver, 233 correction coefficient determiner, 234 control signal transmitter, 235 ground station storage, 236 correction coefficient Table, 901 processor, 902 auxiliary storage device, 903 memory, 904 communication device, 9041 receiver, 9042 transmitter, 905 input interface, 906 output interface, 907 input device, 908 output device, 910 signal line, 911 cable, 912 cable.

Claims (7)

A solar cell paddle having an axis of rotation;
Reaction wheel which rotates while changing the number of revolutions per unit time,
An adjustment angle calculation unit that calculates an adjustment angle for adjusting a paddle angle indicating an angle around the rotation axis of the solar cell paddle using a wheel rotation number that is a rotation number per unit time of the reaction wheel;
And a paddle driving unit configured to rotate the solar cell paddle around the rotation axis such that the paddle angle forms an angle changed by the adjustment angle.
The adjustment angle is an amount by which an increase in angular momentum of the satellite around the reference axis per adjustment cycle deviates from zero by a correction amount with one axis defining the attitude of the satellite as a reference axis. A satellite that is at an angle to The adjustment angle calculation unit calculates the adjustment angle using the wheel rotation number, an adjustment constant for making the increase amount zero, and a correction coefficient for obtaining the correction amount. Satellite described. The satellite includes a control signal receiving unit that receives a control signal including the correction coefficient from a ground station.
The satellite according to claim 2, wherein the adjustment angle calculation unit calculates the adjustment angle using the correction coefficient included in the control signal. The satellite includes a state signal transmission unit that transmits a state signal including the wheel rotation number to the ground station.
The satellite according to claim 3, wherein the correction coefficient is determined by the ground station based on the wheel rotation number included in the state signal. It is mounted on an artificial satellite provided with a solar cell paddle having a rotation axis, a reaction wheel that rotates while changing the number of rotations per unit time, and a paddle drive unit that rotates the solar cell paddle around the rotation axis Storage angular momentum removal device,
A rotation number acquisition unit that acquires, as a wheel rotation number, the rotation number per unit time of the reaction wheel;
An adjustment angle calculation unit that calculates an adjustment angle for adjusting a paddle angle indicating an angle around the rotation axis of the solar cell paddle using the wheel rotation number;
The paddle driving unit includes an adjustment instructing unit configured to rotate the solar cell paddle around the rotation axis such that the paddle angle forms an angle changed by the adjustment angle;
The adjustment angle is an amount by which an increase in angular momentum of the satellite around the reference axis per adjustment cycle deviates from zero by a correction amount with one axis defining the attitude of the satellite as a reference axis. Storage angular momentum removal device which is the angle to The reaction from an artificial satellite provided with a solar cell paddle having a rotation axis, a reaction wheel rotating while changing the number of rotations per unit time, and a paddle drive unit for rotating the solar cell paddle around the rotation axis A status signal receiving unit that receives a status signal including the number of revolutions of the wheel per unit time as the number of wheel revolutions;
A correction coefficient determination unit that determines a correction coefficient used to calculate an adjustment angle for adjusting a paddle angle indicating an angle around the rotation axis of the solar cell paddle using the wheel rotation number included in the state signal;
A ground station apparatus comprising: a control signal transmission unit that transmits a control signal including the correction coefficient to the artificial satellite. The adjustment angle is an amount by which an increase in angular momentum of the satellite around the reference axis per adjustment cycle deviates from zero by a correction amount with one axis defining the attitude of the satellite as a reference axis. The angle to be
The ground station apparatus according to claim 6, wherein the correction coefficient is a coefficient for obtaining the correction amount.

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