JP2001358633A - Satellite operation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize safely and easily operation of high reliability, while intending promotion of various modes of operation. SOLUTION: Plural user satellites 10, in which IP addresses are set, are arranged on an orbit A. Plural, e.g. three, monitoring satellites 301, 302, 303 which can cover the whole earth are arranged on an orbit B higher than the orbit A. One among the three satellites communicates with the user satellites 10. Communication is performed with a terrestrial station 60 which is net- connected with a ground user station 80 via a public communication network, passing the monitoring satellite 302 or 303 from the monitoring satellite 301. Operation management of the user satellites 10 is performed by the monitoring satellites 301, 302, 303. On the basis of the IP addresses, which the user satellites 10 have, communication with the user satellites 10 from the ground user station 80 can be performed via the public communication network, the terrestrial station 60 and the monitoring satellites 301, 302, 303.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite operation system capable of efficiently acquiring information from a user satellite such as an image communication satellite traveling in an orbit around the earth at a terrestrial user station.

[0002]

2. Description of the Related Art In general, as shown in FIG. 8, a satellite operation system is provided such that a satellite 1 for a desired operation is launched from the ground into an orbit A around the earth and deployed. A user station 2 is deployed in a predetermined area on the ground.

[0003] The satellite 1 thus deployed in orbit A
Is in the communication range of the ground user station 2,
A satellite orbit change command transmitted from the ground user station 2,
Various operation commands, such as a normal operation command and an abnormal operation command, are received and operated based on the operation commands to obtain desired information such as image data of the global environment and a desired area. Then, the satellite transmits the desired information obtained from the orbit as telemetry data to the ground user station 2 in a state where the desired information is within the communicable range of the ground user station 2.

However, in the above-mentioned satellite operation system, it is difficult to transmit and receive information between the satellite 1 and the terrestrial user station 2 only when the information is within the communicable range. Provided, the acquired information is temporarily stored in the information recording device, and telemetry transmission must be performed in a state where the satellite 1 is within the communicable range of the terrestrial user station 2, which imposes restrictions on operation. In addition, there is a problem that the equipment of the satellite 1 becomes large.

In the above satellite operation system, for example, if the satellite itself breaks down in an area where communication with the terrestrial user station 2 is not possible, the state of the failure is grasped until the satellite 1 reaches the area where communication is possible. As a result, it is difficult to take measures to avoid danger, and there is a possibility that satellites will be lost.

Therefore, when the satellite 1 breaks down in an area where communication with the terrestrial user station 2 is not possible, other relay satellites are temporarily used or other terrestrial satellites deployed on the earth are used. Since the emergency command must be transmitted to the satellite 1 by using the user station 2 to avoid the emergency, there is a problem that the handling operation is very troublesome.

[0007] In the field of space development in recent years, in a satellite operation system, diversification of operation of the satellite 1 is required, and a plan to launch the satellite 1 in orbit in accordance with the operation has been made. Has become one of the important issues in the future.

[0008]

As described above, the conventional satellite operation system has operational restrictions, requires large-scale satellite equipment, and is very troublesome to handle in an emergency. There is a problem that.

[0009] The present invention has been made in view of the above circumstances, and can simplify the configuration to promote diversification of operation.
Further, it is an object of the present invention to provide a satellite operation system capable of easily realizing highly reliable operation with security.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a ground base station connected to a communication network provided with a plurality of transmission / reception units which are independently controlled in direction is obtained, and information is obtained by navigating a first orbit. A plurality of user satellites provided with a transmission / reception unit for transmitting the obtained information and receiving external information, and having a predetermined interval in a second orbit different from the first orbit. A plurality of monitoring satellites arranged and provided with a transmission / reception unit for selectively executing communication between the plurality of user satellites and the ground base station and transmitting and receiving information between the plurality of monitoring satellites; A plurality of terrestrial user stations that select information obtained from the plurality of user satellites received by the terrestrial base station via the communication network and select the information based on addresses of the plurality of user satellites. Satellite operation system You configure.

According to the above configuration, the plurality of user satellites are:
Sends and receives information to and from the surveillance satellites that are within the field of view of the plurality of surveillance satellites, and transmits the information from the surveillance satellite that performed the communication to the ground base station via the other surveillance satellites. Is done. Here, the terrestrial base station selects a plurality of user satellites based on an address set by the terrestrial user station, and transmits information acquired by the selected user satellite to the terrestrial user station via a communication network. Therefore, the plurality of user satellites can transmit / receive information to / from any of the plurality of monitoring satellites even when the acquired information is traveling in any of the first orbits.
To enable safe and reliable operation of user satellites, and to enable terrestrial user stations to acquire information from desired user satellites via terrestrial base stations, thereby diversifying satellite operations. Becomes possible.

Further, the present invention employs a communication system for transmitting and receiving information between a plurality of monitoring satellites and a plurality of user satellites, the information being spread spectrum with a code different for each satellite.

According to the above configuration, information can be transmitted / received to / from a large number of user satellites in one frequency band, and operation of a large number of user satellites can be performed safely and easily realized.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a satellite operation system according to an embodiment of the present invention. In a low orbit A of the earth, a plurality of user satellites 10 performing a desired mission are provided.
Will be launched from the ground and deployed. In the orbit B higher in altitude than the low orbit A, for example, three monitoring satellites 301, 302, and 303 are provided so as to cover, for example, the entire earth. The plurality of user satellites 10 are set with an address based on a communication protocol such as the TCP / IP protocol, for example, an IP address, and have a PN code different for each satellite from the monitoring satellite based on the IP address. The transmission and reception of the information subjected to the spreading process is performed by a communication method based on a communication protocol such as a TCP / IP protocol.

The plurality of user satellites 10 are, for example, as shown in FIG.
As shown in the figure, the transmitting antenna 11, the information receiving and GP
An S receiving antenna 12 is provided. A transmitter 13 and a receiver 14 are connected to the transmitting antenna 11 and the information receiving antenna 12, respectively.
A microprocessor (CPU) 15 is connected to 4. In addition, the GPS receiving antenna 16 is connected to the microprocessor 15 via a GPS receiver 17, and a GPS signal received by the GPS receiving antenna 16 is input via the GPS receiver 17.

An attitude control system 18 and a mission system 19 are connected to the microprocessor 15 by an interface 2.
0 and 21, and a power supply / temperature system 22 is connected via an analog / digital (A / D) converter 23. The attitude control system 18, the mission system 19, and the power supply / temperature system. When the operation information of 22 is input,
The operation information is subjected to spread spectrum processing based on the PN code and transmitted from the transmitting antenna 12 via the transmitter 14. Then, the microprocessor 15 executes the GP
When a GPS signal is input from the S receiver 17, the position / time information, the attitude control system 18, the power supply / temperature system 22
Based on the operation information of the mission system 19 such as acquisition of ground images and the like, for example, the attitude control system 18 is driven and controlled to take a desired trajectory.
And operation control of the mission system 19 and the like to a desired state.

The receiving antenna 11 is connected to the monitoring satellite 30
When the information is received from 1 (302, 303), the information is supplied to the microprocessor 15 via the receiver 13. The microprocessor 15 controls the attitude control system 18, the power supply / temperature system 22, the mission system 19, and the like based on the input information to control the operation of the user satellite 10.

The microprocessor 15 includes:
A semiconductor memory 24 is connected, and this orbital element, mission information, and the like are stored in the semiconductor memory 24.

The three monitoring satellites 301 (30)
2, 303) are, for example, an information relay function between the user satellite 10 and a terrestrial base station 60 to be described later, a periodic command sending function to the user satellite 10, a function of receiving information from the user satellite 10, and an orbit of the user satellite 10. Control function, user satellite 1
0 is provided.

That is, the three monitoring satellites 30, 31, 3
2, a user satellite receiving antenna 31 and a user satellite transmitting antenna 32 are provided in substantially the same manner as shown in FIG. 3, and a receiver 33 and a transmitter 34 are connected to the antennas 31 and 32, respectively.

The output terminal of the receiver 33 includes a user satellite synchronization circuit 35 corresponding to the plurality of user satellites 10.
When the first input terminal of the switch is connected via the antenna and the information subjected to the spread spectrum processing from the user satellite 10 is input via the receiving antenna 31, the information is transmitted to the user satellite synchronization circuit 35. To the exchanger 36 via

On the other hand, the output terminal of the exchanger 36 is connected to the transmitter 34 via a modulator 37.
Is transmitted to the user satellite 10 via the transmission antenna 32.

The switch 36 is connected to a modulator 38 and a demodulator 39 for transmitting and receiving a terrestrial base station, and the modulator 38 and the demodulator 39 include a terrestrial transmitting / receiving antenna 40 and a transmitter 41 and a receiver. 42. When the information modulated by the modulator 38 is input via the transmitter 41, the terrestrial transmitting / receiving antenna 40 transmits the modulated information to the terrestrial base station 60. When receiving the transmission information from the terrestrial base station 60, the terrestrial transmission / reception antenna 40 outputs the information to the demodulator 39 via the receiver. The demodulator 39 demodulates the input transmission information from the terrestrial base station 60 and outputs the demodulated information to the microprocessor (CPU) 43 via the exchanger 36.

The microprocessor 43 is connected to the exchange 3
6, storage information such as orbital elements of the user satellite 10 stored in the semiconductor memory 44 constituting the recording device;
The operation status of the user satellite 10 is determined based on the operation information from the user satellite 10 input via the switch 36, and the monitoring information is output to the transmitter 34 via the modulator 37. The transmitter 34 transmits the input modulation information to the user satellite 10 via the transmitting antenna 42 and controls the operation of the user satellite 10.

The exchanger 36 includes a modulator 45.
1, 452 and demodulators 461, 462 are the other two monitoring satellites 302, 303 (301, 303) (301, 30).
It is connected and arranged corresponding to 2). These modulators 451,
Monitoring satellite transmitting / receiving antennas 471 and 472 are connected to 452 and demodulators 461 and 462 via transmitters 481 and 482 and receivers 491 and 492, respectively. The monitoring satellite transmitting / receiving antennas 471 and 472 are connected to the monitoring satellite 30.
2, 303 (301, 303) (301, 302) and are provided corresponding to the monitoring satellites 302, 303 (301, 301).
303) Upon receiving the information from (301, 302),
Output to the demodulators 461 and 462. Demodulators 461 and 46
2 demodulates the input information and outputs it to the exchange 36.
The exchanger 36 converts the input information into a microprocessor 43
Output to

Here, when the information from the other monitoring satellites 301, 302, and 303 is input, the microprocessor 43 selectively outputs the information to the modulator 38 via the switch 36. The modulator 38 modulates the input information, outputs the modulated information to the terrestrial transmitting / receiving antenna 40 via the transmitter 41, and transmits the modulated information to the terrestrial base station 60 via the terrestrial transmitting / receiving antenna 40.

The ground transmitting / receiving antenna 40
When receiving the information from the ground base station 60, the information is output to the demodulator 39 via the receiver 42. Demodulator 39
Demodulates the input information and outputs the demodulated information to the exchange 36. Here, based on the control information from the microprocessor 43, the switch 36 transmits the information to other monitoring satellites 302, 303 (301, 30) existing within the communicable range.
3) Selectively output and transmit to the transmission system to (301, 302) or the transmission system to the user satellite 10.

A GPS receiving antenna (not shown) is mounted on each of the monitoring satellites 301, 302, and 303 via a GPS receiver, and the orbit is automatically changed based on the GPS signal received via the GPS receiving antenna. Thus, it is configured to always take a desired trajectory.

The terrestrial base station 60 is provided in a predetermined area on the earth, and the three monitoring satellites 301, 302, 3
03 and the information subjected to the spread spectrum processing are, for example, T
It is transmitted and received by a communication method based on communication protocols such as the CP / IP protocol. That is, the terrestrial base station 60 has a function of distributing information to the terrestrial user station 90 using a communication method based on the same communication protocol in the terrestrial and outer space, and the monitoring satellite 3
01, 302, and 303, a backup function when a monitoring satellite is abnormal, a function of recording information from the user satellite 10, operation of the user satellite 10, and monitoring satellites 301 and 30.
2, 303 operation functions.

For example, as shown in FIG. 4, transmitting antennas 61 and 62 and receiving antenna 6
3 and 64 are 2 units and 3 monitoring satellites 301, 302 and 30
It is provided corresponding to two of the three aircraft. The transmitting antennas 61 and 62 and the receiving antennas 63 and 64 are connected to transmitters 65 and 66 and receivers 67 and 68, respectively, and the transmitters 65 and 66 and the receivers 67 and 68 are
It is connected to a ground computer 73 via modulators 69 and 70 and demodulators 71 and 72.

The ground computer 73 includes a database 74 for storing information such as orbital elements and operation plans of the user satellite 10 and the monitoring satellites 301, 302, and 303. To make backups and create operational plans for user satellites. The ground computer 73 has monitoring satellites 301, 302, 3
A recording device 75 for storing operation information such as mission information of the user satellite 10 supplied via the communication device 03, and storing the operation information from the user satellite 10 in the recording device 75;
The stored operation information is selectively read out via a plurality of ground user stations 80 connected to the network as described later.

A plurality of terrestrial user stations 80 corresponding to the user satellites 10 are connected to the terrestrial computer 73 by the TC.
The network is connected via a communication network based on a communication protocol such as the P / IP protocol. These terrestrial user stations 80 are arranged at random in each region on the earth, and transmit operation information from a desired user satellite 10 to the public communication network based on the IP address set in the user satellite 10 from the region as described above. To get through.

The terrestrial base station 60 is provided with a transmission / reception system (not shown) for transmitting and receiving signals to and from the user satellite 10. For example, when the monitoring satellites 301, 302, and 303 are abnormal, the user satellite 10 It is configured to be able to directly transmit and receive signals to and from the monitoring satellites 301, 302, 3
03 backup function is provided.

In the above configuration, communication between the user satellite 10 and the terrestrial user station 80 is executed in accordance with the procedure shown in FIG. That is, the user satellite 10 includes three monitoring satellites 301,
PN set for each satellite transmitted from 302 and 303
Command information subjected to spread spectrum processing by a code is selectively received and operated based on the command information. The operation information of the attitude control system 18, the power supply / temperature system 22, and the operation information of the mission system 19 are provided. To three monitoring satellites 301, 3
02, 303 to the monitoring satellites 301, 302, 3
In step 03, the operation status is monitored.

For example, as shown in FIG.
Upon receiving commands from the monitoring satellites 301, 302, and 303 via the receiving antenna 11,
The process proceeds to 2 to determine whether the command information can be received. Here, the user satellite 10 identifies the monitoring satellites 301, 302, and 303 by the microprocessor 12 based on the command in a state where the reception level has a desired level and determines that the reception is possible. The amount is calculated (step S3).

Next, the microprocessor 12 controls the attitude control system 1 based on the reception level and the transmission bit rate.
8. The transmission output of the operation information of the power / temperature system 22, the mission system 19, etc. is calculated, a communication signal in which the Doppler shift amount is corrected from the calculated value is generated, and the communication signal is transmitted to the transmission antenna 12 via the transmitter 14. Output (Step S4). The transmitting antenna 12 is connected to the communicable monitoring satellites 301 and 3.
The communication signal is transmitted to the terrestrial base station 60 via the other monitoring satellites 302 and 303 from the communicable monitoring satellite 301 (302, 303). Here, the terrestrial user station 80 is the user satellite 1
The terrestrial base station 60 is accessed via the public communication network based on the IP address of 0, and information such as mission information from the user satellite is obtained.

In this manner, the user satellite 10 orbits the orbit B in the orbit A.
The communication is directly performed with one of the monitoring satellites 301 (302, 303) of the aircraft, and the information is transmitted to the ground base station 60 via the other monitoring satellites 302 or 303.

When it is determined in step S2 that no reception is possible, for example, the monitoring satellite 30
It is determined that an abnormality has occurred in the first, second, and third monitoring satellites 301, 302, and 303, or a monitoring satellite abnormality signal is directly transmitted to the terrestrial base station 60 to support the terrestrial base station 60. Request.

The monitoring satellites 301, 302, 30
3 executes the orbit control of the user satellite 10 in accordance with the procedure shown in FIG. 6 based on the operation information from the attitude control system 18 and the power / temperature system 22 of the user satellite 10 in addition to the information relay function. That is, the monitoring satellites 301, 302, 303
When the operation information from the user satellite 10 is received and input to the microprocessor 43 in step S10, the microprocessor 43 compares the operation information with the storage information stored in the semiconductor memory 44 in step S11.

When the microprocessor 43 determines that the motion information does not match (step S12), the microprocessor 43 calculates the motion correction amount, for example, the trajectory correction amount, and outputs a correction signal corresponding to the trajectory correction amount to the modulator. 37. The modulator 37 modulates the input correction signal and transmits it to the user satellite 10 from the transmitting antenna 32 via the transmitter 34 to instruct the orbit control of the user satellite 10 (step S).
13). Here, when the user satellite 10 receives the correction signal by the receiving antenna 11, the correction signal is input to the microprocessor 15 via the receiver 13. The microprocessor 15 drives and controls the attitude control system 18 based on the input correction signal to execute trajectory control.

The monitoring satellites 301, 302, 3
03 receives the operation information from the user satellite 10 as described above, and stores the operation information and the semiconductor memory 44 in advance.
The monitoring of the user satellite 10 is executed in accordance with the procedure shown in FIG.

That is, the monitoring satellites 301, 302, 303
When a communication signal based on operation information of the attitude control system 18, the power supply / temperature system 22, the mission system 19, and the like is received in step S20, the information and the microprocessor 4
3 to compare with the storage information stored in the semiconductor memory 44 to determine whether the information is within the allowable range (steps S21 and S2).
2). Then, in step S22, in a state where no is determined, the process proceeds to step S23, where an emergency command is transmitted to the user satellite 10, and danger of the user satellite 10 is controlled to avoid danger.

Then, in the state where the limit limit is determined in step S22, the microprocessor 43
A warning signal is output to the ground transmitting / receiving antenna 40 via the exchanger 36, the modulator 38, and the transmitter 41 to warn the ground base station 60 of danger (step S24).

As described above, the above satellite operation system is
A plurality of user satellites 10 with P addresses set are deployed in orbit A, and a plurality of, for example, three monitoring satellites 301, 302, which can cover the entire earth in orbit B higher than orbit A, 303, one of the three monitoring satellites 301, 302, and 303 communicates with the user satellite 10, and the monitoring satellite 301 connects to the public communication network via another monitoring satellite 302 or 303. Communication with the ground base station 60 connected to the ground user station 80 via the
The operation management of the user satellite 10 is executed at 2 and 303, and the user is transmitted from the terrestrial user station 80 via the public communication network, the terrestrial base station 60 and the monitoring satellites 301, 302 and 303 based on the IP address of the user satellite 10. It is configured so that communication with the satellite 10 can be executed.

According to this, the plurality of user satellites 10 are:
Regardless of the state in which the acquired information is traveling in orbit A, information can be transmitted and received to and from any of the three monitoring satellites 301, 302, and 303 at any time, thereby ensuring safety. And reliable user satellite 1
0 is realized, and a terrestrial user station 80 transmits a public communication network, a terrestrial base station 60, monitoring satellites 301 and 302,
It is possible to obtain information from the desired user satellite 10 via 303, and diversification in satellite operation can be achieved.

Further, the communication between the plurality of user satellites 10 and the three monitoring satellites 301, 302, and 303 employs a communication method of transmitting and receiving information that is spread spectrum with a code different for each satellite. As a result, the transmission and reception of information between a large number of user satellites 10 in one frequency band is realized, so that the operation of a large number of user satellites can be secured and easily realized.

In the above-described embodiment, the case where three monitoring satellites 301, 302, and 303 are deployed has been described. However, the number of monitoring satellites is not limited to the number of monitoring satellites, but may be changed according to the altitude of the orbit B. It is also possible to use two or more monitoring satellites. And as this orbit B,
By configuring the orbit different from the orbit A, substantially the same effect can be expected.

In the above embodiment, the ground base station 6
0 has been arranged at one place on the earth, but the present invention is not limited to this.
Can be deployed and configured at multiple locations on the earth.

Therefore, the present invention is not limited to the above-described embodiment, and various other modifications can be made in the implementation stage without departing from the scope of the invention. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some components are deleted from all the components shown in the embodiment, the problem described in the section of the problem to be solved by the invention can be solved, and the effects described in the effects of the invention can be obtained. In such a case, a configuration from which this configuration requirement is deleted can be extracted as an invention.

[0051]

As described above in detail, according to the present invention, the configuration can be simplified, the diversification of operation can be promoted, and the operation can be realized safely and easily with high reliability. A satellite operation system can be provided.

[Brief description of the drawings]

FIG. 1 is an arrangement diagram showing an arrangement configuration of a satellite operation system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a user satellite in FIG.

FIG. 3 is a block diagram showing a configuration of a monitoring satellite in FIG. 1;

FIG. 4 is a block diagram showing a configuration of the terrestrial base station of FIG. 1;

FIG. 5 is a flowchart illustrating a communication operation between the user satellite and the monitoring satellite in FIG. 1;

FIG. 6 is a flowchart shown to explain a monitoring operation of a user satellite by the monitoring satellite of FIG. 1;

7 is a flowchart shown to explain an example of a user satellite abnormality processing operation by the monitoring satellite of FIG. 1;

FIG. 8 is an arrangement diagram showing an arrangement configuration of a conventional satellite operation system.

[Explanation of symbols]

 10 User satellite. 11 ... receiving antenna. 12 ... a transmitting antenna. 13 ... Receiver. 14 ... Transmitter. 15 Microprocessor. 16 ... GPS receiving antenna. 17 ... GPS receiver. 18 ... Attitude control staff. 19 ... Mission officer. 20 ... Interface. 21 ... Interface. 22: Voltage / temperature system. 23 A / D converter. 24 Semiconductor memory. 31 ... User satellite receiving antenna. 32 ... User satellite transmission antenna. 33 ... Receiver. 34 ... Transmitter. 35 ... User satellite synchronization circuit. 36 ... Exchanger. 37 ... modulator. 38 ... modulator. 39 ... demodulator. 40… ground transmitting and receiving antenna. 41 ... transmitter. 42 ... Receiver. 43 ... Microprocessor. 44 Semiconductor memory. 451 modulator. 452 modulator. 461 demodulator. 462: demodulator. 471… Monitoring satellite transmitting and receiving antenna. 472… Monitoring satellite transmitting and receiving antenna. 481 ... Transmitter. 482 ... Transmitter. 491 ... Receiver. 492 ... Receiver. 60 ... ground base station. 61 ... transmitting antenna. 62 ... a transmitting antenna. 63 ... receiving antenna. 64 ... receiving antenna. 69 ... modulator. 70 ... modulator. 71 ... demodulator. 72 ... demodulator. 73… Ground computer. 74… database. 75 Recording device. 80 ... ground user station. A, B ... orbit. S1 to S4 Step. S10 to S13 ... Step. S20 to S24 Step.

Claims (6)

[Claims] 1. A terrestrial base station connected to a communication network provided with a plurality of transmission / reception units whose pointing is controlled, and a device for navigating a first orbit to acquire information, and transmitting the acquired information. And a plurality of user satellites provided with a transmission / reception unit for receiving external information, and are arranged at predetermined intervals in a second orbit different from the first orbit, and the plurality of user satellites and the A plurality of monitoring satellites provided with a transmission / reception unit for selectively performing communication with the ground base station and transmitting and receiving information to and from each other, and receiving by the ground base station via the monitoring satellite And a plurality of terrestrial user stations for selecting information from the plurality of user satellites based on addresses of the plurality of user satellites and acquiring the information via the communication network. . 2. The plurality of user satellites adopt a spread spectrum communication system for transmitting and receiving information spread spectrum with a code different for each satellite to and from the monitoring satellite. 2. The monitoring satellite is selected based on the monitoring satellite, a Doppler shift amount with respect to the monitoring satellite is calculated, and a transmission output in which the Doppler shift amount is corrected is transmitted to the monitoring satellite.
Satellite operation system as described. 3. The orbit of the second orbit is the altitude of the first orbit.
3. The satellite operation system according to claim 1, wherein the satellite operation system is set higher than the orbit of the satellite. 4. The monitoring satellite according to claim 1, wherein said monitoring satellite operates each satellite by judging an operation status of each user satellite based on telemetry data transmitted from said plurality of user satellites. Satellite operation system according to any of the above. 5. A communication protocol between the user satellite and the monitoring satellite, a communication protocol between the monitoring satellite and the terrestrial base station, and a communication protocol between the terrestrial base station and the terrestrial user station are set to be the same. The satellite operation system according to any one of claims 1 to 4, wherein: 6. The terrestrial base station further comprises storage means for storing information from the plurality of user satellites acquired via the monitoring satellite.
The satellite operation system according to any one of the above.