Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Hisayuki Mukae

Hiroshi Koyama

Tsutomu Nakajima

A communication satellite () provided in a satellite information transmission system includes a first optical communication terminal (C), a second optical communication terminal (C), a third optical communication terminal (C), and a fourth optical communication terminal (C). An Azimuth visual field change range (B) of the third optical communication terminal (C) is equal to or more than ±90 degrees with respect to a satellite forwarding direction +X. An Azimuth visual field change range (B) of the fourth optical communication terminal (C) is equal to or more than ±90 degrees with respect to the opposite direction of the satellite forwarding direction +X.

Satellite information transmission system, communication satellite, ground facility, and satellite communication system

When a deorbiting satellite, which is one of artificial satellites belonging to a first satellite constellation, deorbits and drops from an orbit of a first orbital altitude zone, a second satellite constellation widens a relative angle of any adjacent two orbital planes of a plurality of orbital planes and thereby allocates a free orbit area in a second orbital altitude zone. The deorbiting satellite passes through the free orbit area of the second orbital altitude zone.

Satellite constellation maintaining method, satellite constellation, orbital dropping method, and artificial satellite

An artificial satellite includes a recording device, a calculator, and a communication device. The communication device includes a beam control device and a beamforming device. The recording device has recorded therein information indicating communication traffic between the communication device and at least any of a plurality of gateways disposed on ground. When imbalances in communication traffic among the plurality of gateways are present, the calculator derives variable parameters for controlling the beamforming device so that the imbalances in the communication traffic among the plurality of gateways decrease, and transmits the derived variable parameters to the beam control device. The beam control device receives the variable parameters derived by the calculator and controls the beamforming device based on the received variable parameters.

Artificial satellite, satellite communication system, space data center, business device, content distribution business device, network business device, server business device, space data center business device, ground installation, low-earth-orbit broadband constellation business device, and on-demand content distribution method

An optical communication system () is configured of communication satellites () each including an optical communication device and an orbital attitude control device, and a ground facility (). The optical communication device includes a biaxial rough-precision directivity control device and a biaxial high-precision directivity control device. From a state in which a first communication satellite () and a second communication satellite () are mutually directed to each other with rough precision, each establishes a high-precision directivity state by the biaxial high-precision directivity control device. And, as mutually tracked by the biaxial rough-precision directivity control device in accordance with a relative position change based on planned orbit information, each corrects a residual directivity error by the biaxial high-precision directivity control device. From a state in which the first communication satellite () and a third communication satellite are mutually directed to each other with rough precision, each establishes a high-precision directivity state by the biaxial high-precision directivity control device. And, as mutually tracked by the biaxial rough-precision directivity control device in accordance with a relative position change based on planned orbit information, each corrects a residual directivity error by the biaxial high-precision directivity control device.

Optical communication system and flying object addressing system

A reserve satellite cluster including a plurality of satellites stands by at an orbit altitude lower than an orbit altitude of a steadily operated satellite cluster in a satellite constellation. In a case where a satellite configuring the steadily operated satellite cluster has been lost, a satellite, existing around a lost orbital position that is an orbital position where a satellite has been lost in the steadily operated satellite cluster, among satellites configuring the reserve satellite cluster is injected into the lost orbital position in an orbit.

Method, processing circuitry, and computer readable medium intended for use with a satellite constellation including one hundred or more satellites

An object is to prevent satellites constituting a mega-constellation from remaining in outer space in large numbers after completing their missions. An artificial satellite includes a propulsion device. The artificial satellite has propellant to be used by the propulsion device, and the propellant is in an amount required for the artificial satellite to operate in orbit for a first period of L1 years, which is a satellite design life, and then enter the atmosphere within a period less than the first period of years after deorbit. A ground facility controls the artificial satellite so that the artificial satellite has the amount of propellant required to operate in orbit for the first period of L1 years, which is the satellite design life, and then enter the atmosphere within a period of less than the first period of L1 years after deorbit.

Propellant management method and satellite constellation forming system

A space information recorder () includes two or more categories of a category, acquired from a mega-constellation business device, of different constellations formed at nearby altitudes by the same business operator, a category of a satellite group of each constellation that flies at the same nominal altitude and cooperatively realizes the same mission, a category of orbital planes, a category of each orbital plane of the orbital planes, and a category of an individual satellite. The space information recorder () includes information on upper and lower limit values of an orbital altitude or on a nominal altitude and an altitude fluctuation width for each category.

Space information recorder, danger analysis system, danger analysis method, mega-constellation business device, SSA business device, rocket launch business device, satellite business device, debris removal business device, orbital transfer business device, and OADR

A satellite constellation () includes a plurality of artificial satellites (to) that number a multiple of 6. Each of the plurality of artificial satellites orbits in an inclined circular orbit a plurality of times a day. Normals to a plurality of orbital planes corresponding to the plurality of artificial satellites are shifted by an equal angle from each other in an azimuth direction. The plurality of orbital planes make up one or more orbital plane sets each consisting of six orbital planes. Timings at which the six artificial satellites orbit on the six orbital planes of each orbital plane set are synchronized with each other.

Satellite constellation, ground facility, and flying object tracking system

A space information recorder () acquires space object information (), which is orbit forecast information of a plurality of space objects (), from a management business device () used by a management business operator that manages the plurality of space objects (), and records the space object information (). The space object information () includes a forecast epoch, a forecast orbital element, and a forecast error of each of the plurality of space objects (). When it is foreseen that a space object A included in the plurality of space objects () will intrude into a range at orbital altitudes of 300 km to 1000 km in which a satellite group of LST 10:00 to 11:00 is present, a time period from intrusion to exit and orbit forecast information are recorded.

Space information recorder, collision avoidance assistance system, SSA business device, and open architecture data repository

A satellite constellation forming system () forms a satellite constellation which is composed of a satellite group that cooperatively provides a communication service, and has a plurality of orbital planes in each of which a plurality of satellites fly at the same orbital altitude. Each satellite of the satellite group includes inter-satellite communication means and satellite-ground communication means. A satellite constellation forming unit () forms the satellite constellation which has ten or more orbital planes with different normal directions, and in which at least one relative angle in an azimuth direction of adjacent orbital planes of the plurality of orbital planes is arranged to be uneven and satellite-ground communication means of satellites flying in orbital planes spaced unevenly have a communication range that achieves complete ground coverage above the equator.

Satellite constellation forming system, satellite constellation forming method, ground facility, and business device

An SSA business device is a business device with which an SSA business operator manages space object information. The SSA business device includes a space traffic management device that is compatible with space traffic management devices respectively included in business devices that manage space objects. The SSA business device is connected, through the space traffic management device, to a space traffic management system in which the space traffic management devices respectively included in the business devices are mutually connected with a communication line.

Space situational awareness business device, space traffic business device, and space traffic management system

To achieve an objective to enable a plurality of management business operators managing space objects flying in space, to share and carry out danger analysis efficiently. In a space traffic management system, a plurality of space traffic management devices are connected to each other via a communication line. Each of the plurality of space traffic management devices includes a space information recorder, a danger alarm device, a danger analysis device, a danger avoidance action assist device, and a security device. The space information recorder includes a space object ID, orbital information, and public condition information; and a business device ID and public condition information. The plurality of space traffic management devices have data format compatibility and share the space object ID and the business device ID, and share orbital information corresponding to the space object ID among business devices that comply with the public condition information.

Space traffic management system, space traffic management device, and terminal

Having as its objective to take flight safety measure per satellite group, a space information recorder () is mounted in a mega-constellation satellite business device being a business device that manages a satellite constellation of 100 or more satellites, or in a constellation satellite business device being a business device that manages a satellite constellation of 10 or more satellites. The space information recorder () is provided with a category of a satellite group ID () which identifies a satellite group in which a group of a plurality of satellites having the same nominal orbital altitude cooperate with each other to fulfill a mission. The category of the satellite group ID () includes flight safety measure information () expressing flight safety measure of the satellite group.

Space traffic management system and space traffic management device

A database () of a rocket launch assistance device records orbit forecast information of a mega-constellation satellite group () that is acquired from a space information recorder included in a mega-constellation business device and space object information that is acquired from a rocket launch business device. The orbit forecast information of the mega-constellation satellite group () is composed of a prediction value of an orbit of at least one representative satellite () out of the mega-constellation satellite group () and a prediction value of an orbit of a constituent satellite (), which is a value relative to the prediction value of the orbit of the representative satellite ().

Rocket launch assistance device, rocket launch assistance system, rocket launch assistance method, space information recorder, space traffic management device, and mega-constellation business device

A satellite constellation () comprises three artificial satellites (A toC) that monitor a target area of the Earth (). Each artificial satellite circulates on elliptical orbits having sun-synchronization and an orbit inclination angle. A long axis of each elliptical orbit forms an equal angle with each long axis of two adjacent elliptical orbits in a latitude direction.

Growing community of inventors

Tokyo, Japan

Hisayuki Mukae