Satellite communication system, geostationary satellite, and computer program

Abstract

To enable optimization control of variable parameters for satellite communication.SOLUTION: A server device 320 records an identifier, and position coordinates in an earth-fixed coordinate system, with respect to a mobile body 110. A computer 310 derives a variable parameter of a beam forming device 212 using the position coordinates corresponding to the identifier as a target value in order to change a directivity direction of a transmission / reception beam of a communication device 210 to a direction in which the mobile body 110 is located. The beam forming device 212 changes the directivity direction of the transmission / reception beam according to the variable parameter.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to satellite communication.

Background Art

[0002] In recent years, with the high-speed and large-capacity development of communication satellites and the extension of the operation period in orbit, needs have been changing. In order to adapt to the changing needs, the technology of flexible payload has been advancing. In the technology of flexible payload, full digitalization of communication equipment and digital beamforming technology are utilized. In addition, the need for a high-speed broadband satellite communication system using a high-throughput satellite (HTS) is increasing. A high-throughput satellite broadens the channelizer and enables high-capacity communication using a beam control device.

[0003] Patent Document 1 discloses a technique related to transmission power control of a base station in satellite communication.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present disclosure is to enable optimal control of variable parameters for satellite communication.

Means for Solving the Problems

[0006] The satellite communication system of the present disclosure includes a geostationary satellite and a ground system, wherein the geostationary satellite includes a communication device, and the communication device includes a beam control device and a beam forming device. The above-ground system includes a computer and a server device. The server device records an identifier and position coordinates in the Earth-fixed coordinate system for a mobile object that is the target of a communication service. The computer derives variable parameters of the beamforming device using the position coordinates corresponding to the identifier as target values in order to change the direction in which the transmission / reception beam of the communication device is directed to the direction where the mobile object is located, transmits the derived variable parameters to the beam control device. The beamforming device changes the direction in which the transmission / reception beam is directed according to the variable parameters transmitted to the beam control device.

Advantages of the Invention

[0007] According to the present disclosure, optimal control of variable parameters for satellite communication becomes possible.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

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Figure 6

Modes for Carrying Out the Invention

[0009] In the embodiments and the drawings, the same elements or corresponding elements are denoted by the same reference numerals. The description of elements denoted by the same reference numerals as the described elements will be omitted or simplified as appropriate. The arrows in the figures mainly indicate the flow of data or the flow of processing.

[0010] Embodiment 1. The satellite communication system 100 will be described with reference to FIG. 1.

[0011] ***Description of the configuration*** The configuration of the satellite communication system 100 will be described with reference to FIG. 1. The satellite communication system 100 includes a geostationary satellite 200 and a ground system 300.

[0012] The geostationary satellite 200 is an artificial satellite launched into a geostationary orbit. The geostationary satellite 200 orbits the geostationary orbit. The geostationary satellite 200 includes a transceiver 220 and a communication device 210.

[0013] The transceiver 220 is a communication device for transmitting and receiving TTC to and from the ground system 300. TTC is an abbreviation for Telemetry, Tracking and Command. TTC is transmitted and received at a low speed.

[0014] The communication device 210 is a communication device for providing services to one or more mobile bodies 110. Specific examples of the services include satellite communication and satellite positioning. The communication device 210 includes a beam control device 211 and a beam forming device 212. The beam control device 211 is a device for controlling the communication beam. The beam forming device 212 is a device for transmitting and receiving the communication beam.

[0015] The ground system 300 is a system installed on the ground. The ground system 300 includes a computer 310, a server device 320, a gateway device 330, and a tracking control device 340.

[0016] The computer 310 is a computer for performing various calculations.

[0017] The server device 320 is a computer for managing an identifier (ID) and position coordinates for each mobile body 110. The position coordinates mean coordinate values indicating a position. Specifically, the position coordinates are coordinate values in the earth-fixed coordinate system.

[0018] The gateway device 330 is a communication device that functions as a gateway.

[0019] The tracking control device 340 is a device for managing the geostationary satellite 200 through communication with the geostationary satellite 200. For example, the tracking control device 340 transmits and receives housekeeping signals of the geostationary satellite 200.

[0020] ***Description of operations*** The procedure of the operation of the satellite communication system 100 corresponds to a satellite communication method.

[0021] The server device 320 records an identifier and position coordinates in the earth-fixed coordinate system for the mobile body 110 that is the target of the communication service. The computer 310 derives variable parameters of the beamforming device 212 using the position coordinates corresponding to the identifier of the mobile body 110 as target values in order to change the pointing direction of the transmission / reception beam of the communication device 210 to the direction where the mobile body 110 is located. Then, the computer 310 transmits the derived variable parameters to the beam control device 211. The beamforming device 212 changes the pointing direction of the transmission / reception beam according to the variable parameters transmitted to the beam control device 211.

[0022] The computer 310 derives variable parameters of the communication device 210 in order to change the frequency of the transmission / reception beam, and transmits the derived variable parameters to the beam control device 211. The beam control device 211 changes the frequency of the transmission / reception beam according to the transmitted variable parameters.

[0023] ***Detailed description*** In recent years, needs have been fluctuating along with the high-speed and high-capacity development of communication satellites and the extension of the operating period in orbit. In order to adapt to the fluctuations in needs, the technology of flexible payloads has been advancing. In the technology of flexible payloads, full digitalization of communication equipment and digital beamforming technology are utilized. Also, the need for high-throughput satellite (HTS)-based high-speed broadband satellite communication systems is increasing. High-throughput satellites can perform high-capacity communication using a beam control device having a broadened channelizer. In particular, a satellite communication system that improves communication efficiency with moving bodies such as ships or aircraft is eagerly awaited.

[0024] In systems such as the Global Positioning System (GPS) and the quasi-zenith positioning system, the Earth-fixed coordinate system WGS84 is adopted. By adopting the Earth-fixed coordinate system, a positioning signal receiver can measure real-time position coordinates. For example, the positioning signal receiver is equipped in a moving body 110 such as a ship, an aircraft, and a moving vehicle. Therefore, it is possible to store the moving body ID and the position coordinates in the Earth-fixed coordinate system in the server device 320 equipped in the ground system 300. Note that the position coordinates in the Earth-fixed coordinate system are updated as appropriate.

[0025] The position coordinates for each moving body ID may be stored in the server device 320 of the ground system 300 via a landline, or may be stored in the server device 320 of the ground system 300 via the communication device 210 equipped in the geostationary satellite 200.

[0026] The geostationary satellite 200 is standardly equipped with an attitude control device (not shown). And the attitude control device can manage its own position in the Earth-fixed coordinate system and the direction of the transmission / reception beam. Therefore, the computer 310 can set the position coordinates of the moving body 110 in the Earth-fixed coordinate system as a target value and derive variable parameters for the beam pointing direction to point to the target.

[0027] The terrestrial system 300 is equipped with a tracking control device 340 as basic equipment. The geostationary satellite 200 is equipped with a transceiver 220 as basic equipment. The variable parameters derived by the computer 310 are passed to the beam control device 211. At this time, the variable parameters may pass through the tracking control device 340 of the terrestrial system 300 and the transceiver 220 of the geostationary satellite 200, or may pass through the gateway device 330 and the beam forming device 212.

[0028] The communication device 210 has a channelizer and corresponds to a plurality of frequency bands. If the communication device 210 corresponds in advance to a plurality of frequency bands such as the Ku band and the Ka band, the channelizer can manage routing to change the frequency band. Also, even if the center frequency is changed within the same frequency band, a frequency change called beam hopping becomes possible. Therefore, when jammed, an operation to avoid jamming becomes possible.

[0029] Embodiment 2. Regarding the satellite communication system 100, the points mainly different from those in Embodiment 1 will be described with reference to FIG. 2.

[0030] ***Description of the configuration*** FIG. 2 shows the configuration of the satellite communication system 100. The configuration of the satellite communication system 100 is the same as the configuration in Embodiment 1. The shading attached to the arrow from the beam forming device 212 to the mobile body 110 represents a spot beam.

[0031] The beam control device 211 measures communication traffic. The beam forming device 212 and the gateway device 330 communicate information on communication traffic. The computer 310 derives variable parameters.

[0032] ***Description of the operation*** The beam forming device 212 forms a plurality of spot beams. The beam control device 211 measures the communication volume per unit time with the moving body for each spot beam. The beam forming device 212 transmits data (communication volume data) indicating the measured communication volume of each spot beam to the ground system 300. The gateway device 330 receives the communication volume data. The computer 310 derives the variable parameters of the beam forming device 212 based on the measured communication volume of each spot beam so that the deviation of the communication volume of a plurality of spot beams decreases. Then, the computer 310 transmits the derived variable parameters to the beam control device 211. The beam forming device 212 changes all or part of the number of beams, beam width, beam pointing direction, and beam frequency according to the variable parameters transmitted to the beam control device 211.

[0033] ***Detailed description*** The beam control device 211 measures the transmission and reception volume of the beam forming device 212 for each spot beam. Thereby, the communication volume for each spot beam can be monitored as communication traffic.

[0034] The beam forming device 212 transmits the measured communication traffic to the ground system 300 via the gateway device 330. In the ground system 300, the computer 310 derives the variable parameters of the communication device 210 in order to reduce the deviation of the communication volume of a plurality of spot beams. Then, the computer 310 transmits the variable parameters to the beam control device 211.

[0035] In the geostationary satellite 200, the beam control device 211 receives the variable parameters. Then, the beam forming device 212 changes all or part of the number of beams, beam width, beam pointing direction, and frequency according to the variable parameters.

[0036] Needless to say, communication with two or more moving bodies 110 may be performed by one spot beam.

[0037] Embodiment 3. The satellite communication system 100 will be mainly described based on FIG. 3 with respect to the differences from Embodiment 2.

[0038] ***Description of Configuration*** Based on FIG. 3, the configuration of the satellite communication system 100 will be described. The ground system 300 includes a plurality of gateway devices 330.

[0039] ***Description of Operation*** The computer 310 transmits the derived variable parameter to the beam control device 211 via the tracking control device 340 and the transceiver 220.

[0040] Note that the computer 310 may measure the traffic volume of each gateway device 330 and derive a variable parameter based on the traffic volume of each gateway device 330.

[0041] ***Detailed Description*** The geostationary satellite 200 is equipped with a transceiver 220 as basic equipment to control itself soundly. The ground system 300 is equipped with a tracking control device 340 as basic equipment. The computer 310 uses the tracking control device 340 to transmit a variable parameter to the beam control device 211. The tracking control device 340 transmits the variable parameter to the beam control device 211 via the transceiver 220. When the frequency of updating the variable parameter is low and the data volume of the command for instructing the variable parameter is small, the command can be transmitted to the beam control device 211 at low cost by the command passing through the tracking control device 340 and the transceiver 220.

[0042] Embodiment 4. The satellite communication system 100 will be mainly described based on FIG. 4 with respect to the differences from Embodiment 2.

[0043] ***Description of the Configuration*** Based on FIG. 4, the configuration of the satellite communication system 100 will be described. The satellite communication system 100 may or may not include the transceiver 220 and the tracking control device 340.

[0044] ***Description of the Operation*** The computer 310 transmits the derived variable parameter to the beam control device 211 via the gateway device 330 and the beam forming device 212.

[0045] Note that the computer 310 may measure the traffic volume of each gateway device 330 and derive a variable parameter based on the traffic volume of each gateway device 330.

[0046] ***Detailed Description*** The computer 310 uses the gateway device 330 to transmit the variable parameter to the beam control device 211. The gateway device 330 transmits the variable parameter to the beam control device 211 via the beam forming device 212. When the frequency of updating the variable parameter is high and the data volume of the command for instructing the variable parameter is large, by transmitting the command to the beam control device 211 via the gateway device 330 and the beam forming device 212, high-speed TTC transmission and reception can be achieved.

[0047] Embodiment 5. Regarding the satellite communication system 100, the points mainly different from Embodiment 1 and Embodiment 2 will be described based on FIG. 5.

[0048] ***Description of the Configuration*** Based on FIG. 5, the configuration of the satellite communication system 100 will be described. The satellite communication system 100 may or may not include the ground system 300 and the transceiver 220.

[0049] The beam control device 211 performs traffic measurement. Further, the beam control device 211 derives variable parameters.

[0050] ***Description of the operation*** The beam forming device 212 forms a plurality of spot beams. The beam control device 211 measures the communication volume per unit time with the moving body 110 for each spot beam. Then, the beam control device 211 derives the variable parameters of the beam forming device 212 based on the measured communication volume of the plurality of spot beams so that the deviation of the communication volume of the plurality of spot beams decreases. The beam forming device 212 changes all or part of the number of beams, the beam width, the beam pointing direction, and the beam frequency according to the derived variable parameters.

[0051] ***Detailed description*** The beam control device 211 measures the communication volume of the beam forming device 212 for each spot beam. Then, the beam control device 211 derives variable parameters in the same manner as the computer 310 of the second embodiment. Thereby, the communication device 210 can autonomously and quickly set optimal parameters.

[0052] Embodiment 6. The satellite communication system 100 will be mainly described based on FIG. 6 with differences from Embodiment 1 and Embodiment 2.

[0053] ***Description of the configuration*** Based on FIG. 6, the configuration of the satellite communication system 100 will be described. The satellite communication system 100 may include the ground system 300 and the transceiver device 220, or may not include the ground system 300 and the transceiver device 220.

[0054] The communication device 210 includes a server device 213. The server device 213 corresponds to the server device 320 in Embodiment 2. The server device 213 is also referred to as an edge server.

[0055] The beam control device 211 performs traffic measurement. Further, the beam control device 211 derives variable parameters. The server device 213 acquires and manages an identifier and position coordinates for each mobile body 110.

[0056] ***Description of Operations*** The server device 213 stores an identifier and position coordinates in the earth-fixed coordinate system for each of the plurality of mobile bodies 110. The beamforming device 212 forms a plurality of spot beams directed at the plurality of mobile bodies 110 based on the information stored in the server device 213. The beam control device 211 measures the communication volume per unit time with the mobile body 110 for each spot beam. Then, the beam control device 211 derives the variable parameters of the beamforming device 212 based on the measured communication volume of the plurality of spot beams so that the deviation of the communication volumes of the plurality of spot beams decreases. The beamforming device 212 changes all or part of the number of beams, beam width, beam direction, and beam frequency according to the derived variable parameters.

[0057] ***Detailed Description*** Edge computing technology is advancing. With edge computing technology, the computer processing that was performed in the ground system is distributed and processed on the device side in accordance with the evolution of the IoT. IoT is an abbreviation for Internet of Things.

[0058] In Embodiment 2, for the management of communication resources, the optimization process of the variable parameters is performed by the computer 310 of the ground system 300. In Embodiment 6, the communication device 210 of the geostationary satellite 200 includes a server device 213. Then, the optimization process of the variable parameters is carried out on orbit by the beam control device 211. As a result, the processing load on the ground system 300 is reduced. Also, the communication traffic between the ground system 300 and the geostationary satellite 200 is reduced. Furthermore, in the geostationary satellite 200, it becomes possible to perform autonomous and real-time optimization control of the variable parameters.

[0059] ***Summary of Embodiments*** The satellite communication system 100 manages satellite resources for using a communication satellite (geostationary satellite 200) in an emergency. And, the satellite communication system 100 autonomously and in real time performs optimization control of variable parameters for a fully digitized flexible payload by managing the satellite resources.

[0060] ***Supplementary Explanation of Embodiments*** The purpose of the embodiment is to transfer the resource management function, which was conventionally carried out by a ground system, onto orbit in a high-speed broadband satellite communication system. And, it aims to construct a high-speed broadband satellite communication system based in space even under circumstances where communication traffic changes. For this purpose, the communication device (communication device 210) is monitored and managed autonomously, dynamically, and in a timely manner. The communication device has flexibility regarding frequency allocation and service coverage. The frequency allocation is called a flexible payload.

[0061] The satellite communication system is becoming more flexible and digitized, and there is a long-awaited satellite communication system 100 that improves communication efficiency. For this purpose, the variable parameters of the communication device are optimally controlled in adaptation to the spatial and temporal transitions of communication traffic in communication with a plurality of mobile bodies 110.

[0062] For example, in an emergency, a communication satellite needs to continue communicating with each of a plurality of mobile bodies 110 whose positions change every moment. Specific examples of the plurality of mobile bodies 110 are aircraft, ships, and land assets. Therefore, it is a challenge to maintain communication with a mobile body 110 that requires a huge amount of communication, such as an Aegis ship.

[0063] Also, in the event of a large-scale disaster, it is necessary to continue communicating with each of a plurality of mobile bodies 110 whose positions change every moment. Specific examples of the plurality of mobile bodies 110 are emergency helicopters and emergency vehicles.

[0064] In addition, in normal communication services, it is expected to change the communication service area and communication volume in accordance with the movement of the position of each mobile body 110 over time. Specific examples of each mobile body 110 are ships or aircraft. A specific example of a ship is a cruiser.

[0065] The following functions are eagerly awaited regarding the frequency used for communication. For example, in order to perform frequency hopping when a satellite communication system is jammed, a function to change the frequency as a variable parameter is eagerly awaited. Frequency hopping is a technique for changing the frequency band when jammed.

[0066] Therefore, the communication device includes a beam control device 211 and a beam forming device 212. The beam control device 211 sets a variable parameter. Then, the ground system 300 transmits each of the mobile body ID and the earth-fixed position coordinates to the geostationary satellite 200 as command values. Thereby, the steering control of the transmission and reception beams is performed.

[0067] In addition, the communication device forms a plurality of spot beams and monitors the communication traffic with the plurality of mobile bodies 110. Then, the communication device controls the variable parameter so that the deviation of the communication traffic between the spot beams becomes small. Thereby, the communication efficiency is improved.

[0068] In recent years, the digitalization of communication devices has advanced, enabling changes in the number of beams, beam width, beam steering direction, and frequency. This change is made possible by the beam control device adopting a digital channelizer, changing the routing, and changing the settings of the digital beamforming device. And control algorithms for variable parameters are being studied.

[0069] For the optimal control of variable parameters, the following variable parameter optimization algorithms are eagerly awaited. Generally, the variable parameter optimization algorithm monitors the communication traffic of a plurality of gateways deployed on the ground, and uses the deviation of the communication congestion degree between the gateways as an evaluation index to change the number of beams, beam width, and beam steering direction.

[0070] In the satellite communication system 100, it is reasonable to adopt the following variable parameter optimization algorithm. The variable parameter optimization algorithm monitors the communication traffic for each spot beam, and uses the deviation of the communication congestion degree between the spot beams as an evaluation index to change the number of beams, beam width, and beam steering direction.

[0071] Conventionally, it has been studied to control the variable parameters of communication devices by equipping the terrestrial system with communication resource management. However, by the computer mounted on the satellite optimally implementing the communication resource management in orbit, optimal control of the variable parameters becomes possible autonomously and in real time. The computer is provided in, for example, the beam control device 211. As a result, effects such as speedup, labor saving, and improvement of communication efficiency can be obtained.

[0072] In recent years, full digitization of flexible payloads using digital channelizers and digital beamforming has been the trend. In full digitization, flexibility is ensured by variable beam control. Variable beam control performs frequency allocation, beamwidth change, and field-of-view direction change. However, the equipment used does not necessarily have to be limited to digital equipment. That is, it is possible to construct an inexpensive system by a combination including analog equipment.

[0073] Communication traffic is the variation in the amount of data transmitted and received. When there is a large deviation in the amount of data between gateways, the data rate can be leveled by expanding the transmission capacity. The transmission capacity is expanded by means of increasing the beam types so that the frequency band for gateways with a large amount of data becomes wider, or by means of increasing the number of beams per unit service area.

[0074] When there is a large deviation in the amount of data between spot beams, the traffic per spot beam can be changed by reconfiguring the number of beams, beamwidth, and bandwidth. Therefore, the traffic is leveled.

[0075] As a function of monitoring communication traffic and managing the resources of the digital payload of a communication device, the following optimization control by an optimization algorithm is being implemented. The optimization control monitors the change in traffic of a plurality of gateways deployed on the ground, flexibly controls the digital beam so that the resources (such as power and communication capabilities) of the satellite are optimally allocated, and levels the data rate between gateways.

[0076] Conventionally, the management of communication resources has been carried out on the ground. If the geostationary satellite 200 equipped with an edge server performs the management of communication resources in orbit, the burden on the ground system 300 is reduced.

[0077] Beamforming technology is a technology for transmitting radio waves, sound waves, or ultrasonic waves in a specific direction or receiving them from a specific direction. In a phased array antenna (PAA), a technology for controlling the direction of transmission of a transmission beam, the beam width, and the transmission power for each transmission / reception module is known. A phased array antenna is also called an active PAA.

[0078] In recent years, a device that performs beamforming by arranging a large number of feeds is known. As an amplifier, a traveling wave tube amplifier (TWTA) or a solid-state power amplifier (SSPA) is used.

[0079] As a beam control device, a channelizer that changes the routing of a plurality of channels is known. The beam control device 211 selects a plurality of frequency bands such as the Ka band and the Ku band, performs frequency control called frequency hopping, and controls the beam width, the direction of pointing, and the power of the beamforming device 212. Frequency hopping changes the center frequency used and the band used within the same frequency band.

[0080] General communication resource management manages the resources of a digital payload. However, the communication device according to the embodiment may handle an analog payload or a semi-digital payload in which analog and digital are mixed.

[0081] The computer 310 and each device, which are elements of the satellite communication system 100, include a processing circuit. The processing circuit is hardware that realizes the functions of the computer 310 or each device. The processing circuit may be dedicated hardware or a processor that executes a program stored in a memory.

[0082] When the processing circuit is dedicated hardware, the processing circuit is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. ASIC is the abbreviation of Application Specific Integrated Circuit. FPGA is the abbreviation of Field Programmable Gate Array.

[0083] In the processing circuit, some functions may be realized by dedicated hardware, and the remaining functions may be realized by software or firmware.

[0084] Thus, the functions of each device can be realized by hardware, software, firmware, or a combination thereof.

[0085] A computer program will be described. The computer program is a program for causing a computer to execute parameter derivation processing in the satellite communication system 100. The computer program can be recorded (stored) in a non-volatile recording medium such as an optical disk or a flash memory in a computer-readable manner. The parameter derivation processing is executed by the computer 310 or the beam control device 211.

[0086] Each embodiment is an example of a preferred form and is not intended to limit the technical scope of the present disclosure. Each embodiment may be partially implemented or may be implemented in combination with other forms. The procedures described using flowcharts and the like may be changed as appropriate.

Description of Reference Numerals

[0087] 100 Satellite communication system, 110 Mobile body, 200 Geostationary satellite, 210 Communication device, 211 Beam control device, 212 Beam forming device, 213 Server device, 220 Transceiver device, 300 Ground system, 310 Computer, 320 Server device, 330 Gateway device, 340 Tracking control device.

Claims

1. A geostationary satellite and a ground system, wherein the geostationary satellite is provided with a communication device, the communication device is provided with a beam control device and a beam forming device, the ground system is provided with a computer and a server device, the server device records an identifier and position coordinates in a geocentric coordinate system for a mobile object that is a target of a communication service the computer derives variable parameters of the beam forming device using the position coordinates corresponding to the identifier as target values in order to change the direction of the transmission / reception beam of the communication device to the direction in which the mobile object is located, transmits the derived variable parameters to the beam control device, the beam forming device changes the direction of the transmission / reception beam according to the variable parameters transmitted to the beam control device A satellite communication system.

2. the computer derives variable parameters of the communication device in order to change the frequency of the transmission / reception beam, transmits the derived variable parameters to the beam control device, the beam control device changes the frequency of the transmission / reception beam according to the transmitted variable parameters The satellite communication system according to claim 1.

3. A geostationary satellite is provided, the geostationary satellite is provided with a communication device, the communication device is provided with a server device, a beam control device, and a beam forming device, the server device stores an identifier and position coordinates in a geocentric coordinate system for each of a plurality of mobile objects, the beam forming device forms a plurality of spot beams directed at the plurality of mobile objects based on the information stored in the server device, the beam control device measures the communication volume per unit time with a mobile object for each spot beam, and derives variable parameters of the beam forming device based on the measured communication volume of each spot beam so that the deviation of the communication volumes of the plurality of spot beams decreases, the beam forming device changes all or part of the number of beams, beam width, beam direction, and beam frequency according to the derived variable parameters A satellite communication system.

4. A geostationary satellite for the satellite communication system according to claim 3.

5. A computer program for causing a computer to execute parameter derivation processing in a satellite communication system, wherein the satellite communication system includes a geostationary satellite and a ground system, The stationary satellite is provided with a communication device, The communication device is provided with a beamforming device, The ground system is provided with a plurality of gateway devices, The beamforming device forms a plurality of spot beams, The parameter derivation process derives variable parameters of the beamforming device based on the measured traffic volume of each gateway device so that the deviation of the traffic volume of the plurality of spot beams decreases. Computer program.

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