JP2019047262A - LEO communication terminal, LEO communication service system, program for LEO communication terminal, and LEO communication terminal power saving control method - Google Patents

Abstract

To provide a good transmission power control method, with regard to communication control of a LEO communication terminal sending arbitrary data toward a LEO satellite constellation at an arbitrary timing.SOLUTION: A LEO communication terminal is constituted to include a reception part for receiving communication waves from each LEO satellite constituting a LEO satellite constellation, a transmission part for sending communication waves toward each LEO satellite, a storage section for storing the positional information of an own terminal, and a control section for receiving the orbit information of an orbit where at least one LEO satellite flies, broadcasted from any LEO satellite via the reception part, and deriving the transmission timing of arbitrary data and the transmission power used at the transmission timing, on the basis of the positional information of the own terminal stored in the storage section and the received orbit information, and the arbitrary data to be transmitted toward the LEO satellite constellation is sent from the transmission part according to the transmission timing and the transmission output derived in the control section.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a LEO communication service system using a LEO satellite constellation constructed of orbiting satellites orbiting a low earth orbit (LEO).

  Recently, satellite communication is used to perform remote monitoring and remote control of various communication terminals on the ground, at sea, and in flight (hereinafter also referred to as terminal devices and terminals, and also called edge devices and terminals). Also, communication terminals using the LEO satellite constellation are called LEO communication terminals or simply LEO terminals. The LEO communication terminal includes, for example, an airplane, a drone, an autonomous vehicle, a mobile phone, a vending machine, and a sensor node.

  An example of remote monitoring and control using satellites is an air traffic control system. The air traffic control system uses satellite based augmentation system (SBAS) to help monitor and control air traffic. The air traffic control system, even with the most extensive service navigation services, has been limited to regional services to North America, Asia and the Pacific, and to Europe, and has never been offered with global scale.

  Another remote surveillance control example is the Iridium satellite telephone system. The Iridium satellite telephone system detects the origination of an Iridium telephone on the earth and calls the Iridium telephone of the destination. The Iridium satellite telephone system is a LEO satellite system, and a satellite constellation is formed by many satellites introduced into the LEO orbit.

  The LEO communication system can construct a constellation with many satellites orbiting low altitude to provide a global communication infrastructure. This LEO communication system can be used as infrastructure for various applications.

  In today's LEO constellation, individual satellites are required to handle LEO communication terminal groups from sparse to huge numbers with flexibility for each grid. For example, when all terminals existing in a certain area (a grid provided on the ground, the sea, or the air) are received, the number of terminals tends to be large in urban areas and sparse in rural areas. Also, in the ocean, the number of terminals tends to be large in the harbor and the bay and sparse in the open ocean.

  Each LEO satellite appropriately receives each communication from the LEO communication terminal group. Each communication from this group of LEO communication terminals may be transmitted from the terminals to the LEO satellite at timings and frequency bands that interfere with each other, unless some appropriate management is performed. It can be said that this communication interference generally occurs as the number of terminals increases. Also, it is assumed that this communication interference is greatly affected by the communication speed of each terminal, the communication method, and the like.

  The LEO satellite constellation is also being considered for use by various service vendors as a communication infrastructure. It is assumed that service vendors prepare their own ground facilities, or rent ground facilities from operators of LEO satellite constellations to construct a LEO communication service system.

  The LEO communication service system is configured to be able to provide various services to users using the LEO satellite constellation. In many cases, in the LEO communication service system, a data collection base is provided on the ground to collect arbitrary data collected by the LEO communication terminal group. In addition, the LEO communication service system is often provided with one or more management units that control the service.

  An invention relating to an LEO communication system (communication service system) is described in Patent Document 1. The data relay system described in this patent document contains arbitrary data transmitted from the LEO satellite group (relay satellite 12 group of the document) from the LEO communication terminal group (ground transmission station 11 group of the document). Radio waves are relayed to the ground facility (ground antenna 13 and analysis station 14 of the document), and the relayed radio waves are separated (analyzed) into arbitrary data respectively transmitted by the ground facility (analysis station 14 of the document). Use.

  Further, another invention related to the LEO communication system (communication service system) is described in Patent Document 2. This document mounts a camera on the LEO satellite and sends a command or pilot signal to the LEO satellite to capture the position of the sensor node, the LEO satellite captures a satellite image of the position of the sensor node, and the ground station together with the sensing results. The LEO communication service system is disclosed.

  The LEO communication service is assumed to have various services in addition to common services such as position coordinate confirmation of terminal devices and fixed point observation of sensor values. For example, transport services by moving objects such as autonomous vehicles and robot ships, ISR (Intelligence, Surveillance and Reconnaissance) services by moving objects such as drone and unmanned aerial vehicles, exploration rover, remote by fixed unmanned sensors such as meteorological meters and wave height meters Sensing service, remote supply service of beverage and food by vending machine (vending machine), etc. may be mentioned.

  In order to ensure quality of service, normal operation, long-time battery operation, power-saving operation, etc. of each terminal device used for service are desired. While service vendors and users generally want to know the normal operating status, they may not be required to always know the operating status in real time based on the cost aspect. For example, the service quality per second is excessive for service users who do not mind if it is possible to acquire the operating status and sensing data every hour or every day. In addition, terminals that transmit sensing data every second require transmission power for that amount, which may cause adverse effects such as shortening of operating time.

JP, 2014-204177, A JP, 2016-181862, A

  The LEO satellite constellation (LEO satellite system) can build a global infrastructure for many terminals. In addition, there are many LEO communication terminals in which miniaturization and power saving have been achieved with respect to communication terminals using geosynchronous satellites. This is related to the fact that the communication distance between the LEO satellite and the LEO communication terminal is shorter than the communication environment between the geosynchronous satellite and the communication terminal, as one of the factors is that each LEO satellite travels in a low orbit.

  On the other hand, the communication environment between the LEO satellite and the LEO communication terminal changes in a short time, unlike the communication environment between the geosynchronous satellite and the communication terminal and the communication environment between the medium orbit satellite and the communication terminal. In other words, the communicable direction between the LEO satellite and the LEO communication terminal and the distance between the satellite terminals change faster than the communication environment between the medium orbit satellite and the communication terminal.

  As described above, LEO communication is characterized in that the satellite position relative to the ground changes at high speed. For this reason, the antenna direction and transmission power which can obtain the favorable communication environment of a LEO communication terminal and a LEO satellite change sequentially. That is, the transmission timing suitable for transmitting arbitrary data from the LEO communication terminal to the LEO satellite changes. In addition, LEO communication is also characterized by a plurality of LEO satellites flying one after another.

  For this reason, for example, an attempt has been made to provide a good communication environment by incorporating a mechanism for tracking an LEO satellite and a mechanism for strongly transmitting a transmission wave with a wide-angle transmittable / receiveable antenna on the LEO communication terminal side. However, these measures tend to increase power consumption.

  Therefore, the inventors examined a good power saving control method regarding communication control of the LEO communication terminal.

  Further, the LEO communication system (LEO communication terminal) described in Patent Documents 1 and 2 does not mention the viewpoint of power consumption, and does not solve the above problem. Power consumption used for communication is also an important issue in order to continuously obtain a good communication environment. Also, if the power consumption used for communication is high, various restrictions such as operating time may occur.

  The present invention has been made in view of the above problems, and is an LEO communication terminal in which the transmission power for transmitting a communication wave including arbitrary data toward the LEO satellite constellation is reduced with respect to an existing LEO communication terminal. An object of the present invention is to provide an LEO communication service system, a program for an LEO communication terminal, and an LEO communication terminal power saving control method.

  The LEO communication terminal according to an embodiment of the present invention includes a receiving unit for receiving communication waves from each LEO satellite constituting the LEO satellite constellation, and communication waves directed to each LEO satellite constituting the LEO satellite constellation. At least one LEO satellite belonging to the LEO satellite constellation broadcasted from a transmitter transmitting, a storage unit storing position information of the own terminal, and any LEO satellite constituting the LEO satellite constellation fly The orbit information of the orbit is received through the receiving unit, and transmitted from the own terminal to the LEO satellite constellation based on the position information of the own terminal stored in the storage unit and the accepted orbit information. Transmission timing of arbitrary data, and a control unit for deriving a transmission output used at the transmission timing; And transmitting, from the transmission unit, arbitrary data to be transmitted toward the LEO satellite constellation in accordance with the transmission timing and the transmission output derived by the control unit.

  An LEO communication service system according to an embodiment of the present invention transmits to a LEO satellite group belonging to an LEO satellite constellation, orbit information of an orbit in which at least one LEO satellite belonging to the LEO satellite constellation flies. And a data generation unit for acquiring arbitrary data to be transmitted to the ground station via the LEO satellite constellation, and receiving communication waves from each LEO satellite constituting the LEO satellite constellation and communicating toward each LEO satellite A communication unit for transmitting waves, and receiving via the communication unit orbit information broadcasted from any of the LEO satellites constituting the LEO satellite constellation, and receiving the current position information of the own terminal and the reception From the own terminal to the LEO satellite constellation based on the The transmission timing of the arbitrary data to be transmitted and the transmission output used in the transmission timing are derived as the transmission condition, and the arbitrary data generated by the data generation unit is transmitted from the communication unit according to the derived transmission condition. I assume.

  A program for LEO communication terminal according to an embodiment of the present invention communicates to a reception unit for receiving communication waves from each LEO satellite constituting the LEO satellite constellation and to each LEO satellite constituting the LEO satellite constellation. Transmission unit for transmitting waves, storage unit for storing position information of the own terminal, transmission timing for transmitting arbitrary data from the own terminal to the LEO satellite constellation, and control for adjusting transmission output used in the transmission timing At least one LEO satellite belonging to the LEO satellite constellation broadcast from any of the LEO satellites constituting the LEO satellite constellation received via the receiver, the controller of the LEO communication terminal comprising Trajectory information of the trajectory on which the aircraft flies and the own terminal stored in the storage unit It is characterized by reading the position information and determining the transmission timing of arbitrary data to be transmitted from the own terminal toward the LEO satellite constellation and the transmission output used in the transmission timing so as to reduce the power consumption. .

  A LEO communication terminal power saving control method according to an embodiment of the present invention is directed to a receiving unit that receives communication waves from each LEO satellite that configures a LEO satellite constellation, and each LEO satellite that configures the LEO satellite constellation. And a transmission unit for transmitting communication waves, a storage unit for storing position information of the own terminal, transmission timing for transmitting arbitrary data from the own terminal toward the LEO satellite constellation, and adjustment of transmission output used in the transmission timing An LEO communication terminal having a control unit prepares in advance the position information of its own terminal in the storage unit, and belongs to the LEO satellite constellation broadcasted from any LEO satellite constituting the LEO satellite constellation. Accepts orbit information of the orbit of at least one LEO satellite through the receiver Prior to sending arbitrary data to be transmitted toward the LEO satellite constellation from the transmission unit, the self-device based on the position information of the own terminal stored in the storage unit and the received orbit information is used. Transmission timing of arbitrary data to be transmitted from the terminal toward the LEO satellite constellation and the transmission output used in the transmission timing are derived by the control unit, and the arbitrary data to be transmitted toward the LEO satellite constellation is the control unit Sending from the transmission unit according to the transmission timing and the transmission output derived in the above.

  According to the present invention, an LEO communication terminal, an LEO communication service system, and a program for an LEO communication terminal, wherein transmission power for transmitting a communication wave including arbitrary data toward an LEO satellite constellation is reduced with respect to an existing LEO communication terminal. And LEO communication terminal power saving control method can be provided.

FIG. 1 is a schematic view showing an LEO communication service system 1 of an embodiment. FIG. 2 is an explanatory view schematically showing an LEO constellation used by the LEO communication service system 1; It is a block diagram showing an example of 1 composition of LEO communication terminal 20 of an embodiment. It is explanatory drawing which showed typically the relationship between the satellite track of the power saving method using a satellite track and an own terminal position, and a terminal position. It is another explanatory view schematically showing the relationship between the satellite orbit and the terminal position in the power saving method using the satellite orbit and the own terminal position. It is the flowchart which showed the example of a satellite orbital information notification flow to the LEO communication terminal 20 group. It is the flowchart which showed the example of the data collection flow which collects arbitrary data from the LEO communication terminal 20 group. 6 is a flowchart showing an example of a transmission condition setting flow by the LEO communication terminal 20.

  Embodiments of the present invention will be described based on the drawings.

First Embodiment
FIG. 1 is a schematic view showing the LEO communication service system 1 of the embodiment. The LEO communication service system 1 in the figure is comprised of a ground station 10 (ground facility) and a group of LEO communication terminals 20. In FIG. 1, one LEO satellite 100 is described as the LEO satellite constellation for the sake of representation of the figure, and only a few of the LEO communication terminals 20 that exist on the ground etc. are described.

  The LEO communication terminal 20 of this embodiment is configured to transmit arbitrary data to the ground station 10 via the LEO satellite constellation. Examples of the LEO communication terminal 20 include an airplane, a drone, an autonomous vehicle, a smartphone, a vending machine, and a sensor node.

  FIG. 2 is an explanatory view schematically showing an LEO constellation used by the LEO communication service system 1. The LEO constellation is comprised of a plurality of LEO satellites 100 orbiting the LEO. The number of satellites of the LEO constellation shown in the figure is an example, and the LEO satellites 100 may be smaller or larger than the number of satellites shown in the figure.

  The ground station 10 of the present embodiment includes at least a data collection station 11 and a management station 12. The ground station 10 receives arbitrary data from the LEO communication terminal 20 via the LEO satellite constellation and collects it in the data collection station 11. The data collection station 11 does not necessarily have to be one site, and it is desirable that the data collection station 11 be appropriately and efficiently arranged within the communicable range with the satellite constellation. Further, when a plurality of data collection stations 11 are provided, it is desirable that the respective data collection stations 11 mutually exchange collected data so that predetermined data are collected in the predetermined data collection station 11.

  In the present embodiment, the management station 12 manages satellite orbit information in which the satellite orbits of the LEO satellites 100 are indicated. The management station 12 individually or collectively notifies the LEO communication terminal 20 of satellite orbit information of each LEO satellite 100 belonging to the LEO satellite constellation. The management station 12 may be operated by a service vendor. In this case, the service vendor may transmit, from the management station 12 (ground station 10), satellite orbit information of the LEO satellites (groups) used in the provided service. This makes it possible to adaptively exhibit the power saving function of the LEO satellite 100 described below.

  The LEO communication terminal 20 autonomously sets transmission conditions for transmitting arbitrary data to the data collection station 11 via the LEO satellite constellation, based on the position information of the own terminal and the acquired satellite orbit information.

  Although the method for the LEO communication terminal 20 to acquire the satellite orbit information of each LEO satellite 100 is not particularly limited, there may be mentioned a method for receiving satellite orbit information distributed by broadcast distribution via a satellite constellation. Also, the LEO communication terminal 20 may receive satellite orbit information via other communication means, for example, WiFi (registered trademark) or terrestrial radio waves.

  As for the position information of the own terminal, if the LEO communication terminal 20 can measure the position, it is sufficient to acquire the position information measured periodically or at the time of operation. Further, as the position information, in the case of the fixed installation type LEO communication terminal 20, the position information recorded by the installer in the internal memory may be used at the time of installation. Also, the LEO communication terminal 20 may receive position information from a nearby terminal device by short distance communication or wired communication.

  A plurality of individual parameters are pre-recorded for the determination of the transmission conditions of arbitrary data set by LEO communication terminal 20 for power saving, and from among them, position information of the own terminal and satellite position (satellite orbit information) It is possible to adopt a method of selecting individual parameters one by one based on the positional relationship between For example, as described later, the LEO communication terminal 20 can determine the transmission timing of arbitrary data and the transmission output used for the transmission. As the individual parameter, a time for determining transmission timing, a timer value, a voltage value, a current value, and the like may be appropriately determined adaptively.

  Further, the LEO communication terminal 20 may set transmission conditions for transmitting arbitrary data to the data collection station 11 based on one or a plurality of indices associated with the LEO satellite 100 as the communication destination. This index may be managed and notified by the ground station 10 (management station 12, service vendor), or may be notified (broadcasted) by each LEO satellite 100 autonomously.

  In addition, the LEO communication terminal 20 sends out arbitrary data to the data collection station 11 based on the position information of the own terminal, the distance to the satellite as the communication destination, and the index associated with the satellite as the representative communication destination. May be set autonomously.

  In addition, the LEO communication terminal 20 is configured to receive and hold only the index associated with the LEO satellite 100 that can be the communication destination in advance, and appropriately use the index as a factor for reflection of the index or calculation in the communication condition. Is desirable. According to this configuration, it is possible to set the power saving setting, the priority to another terminal, and the like based on the index set by the service vendor, for example. Therefore, for example, it is possible to give a degree of freedom that the service side sets the priority to the battery operating terminal.

  As the index set for each LEO satellite 100, for example, the communication state (remaining capacity) of the individual LEO satellite 100 can be adopted. Similarly, as this indicator, an indicator indicating use termination can be adopted. Similarly, an index for limiting the transmission height of arbitrary data, or an index for enabling communication only in a specific area such as the ground or the sea may be provided. In addition, an index for setting a communication time zone may be provided. In addition, an index may be adopted which specifies the communication method to be used, coding / decoding method / communication protocol, and the like. Also, various weighting factors may be adopted as the index to be notified. Further, as these indicators, indicators may be adopted for each service provided by the service vendor.

  For example, if the service vendor notifies the LEO terminal group 20 of various indexes for each service together with satellite orbit information via the management station 12, a certain LEO terminal 20 can not identify itself for each service to which it belongs. The LEO communication service system 1 can be operated so as to be able to set the communication power saving method for transmitting arbitrary data of the terminal. Furthermore, the LEO terminal 20 may further receive arbitrary group management setting information and reflect it on the power saving setting.

  The various indexes and the various information may be listed and notified / registered to the LEO communication terminal 20 collectively.

  When the LEO communication terminal 20 configured in this way adjusts the transmission conditions using the satellite orbit information and the position information of the own terminal, when transmitting arbitrary data to the data collection station 11 via the LEO satellite constellation. It is possible to set the setting used for the power saving setting. Further, for example, by adding an index designated by the management station 12 and using it, it is possible to save power for transmitting arbitrary data to the data collection station 11.

  Next, one configuration example of the LEO communication terminal 20 will be described. FIG. 3 is a block diagram showing an example of the configuration of the LEO communication terminal 20 operated in the LEO communication service system 1 of the present embodiment.

  The illustrated LEO communication terminal 20 includes a control unit 21, a storage unit 22, and a communication unit 23. In addition to the above configuration, a sensor, a camera, a microphone, a positioning unit, and the like may be appropriately mounted on the LEO communication terminal 20 as a data generation unit that acquires arbitrary data. For example, if the LEO communication terminal 20 is equipped with a GPS (Global Positioning System) receiver as a satellite positioning signal receiver, the position information of the own terminal can be acquired via the positioning unit. In addition to the GPS waves, a satellite positioning signal receiver may be mounted which receives signal waves of other satellite positioning systems, signal waves of quasi-zenith satellites, and the like.

  In addition, although this LEO communication terminal 20 is not essential, the structure which comprised the battery power supply part can be assumed. The battery power supply unit receives at least power for driving the communication unit 23. With the configuration having the battery power supply unit, for example, the operating time of the terminal can be extended by realizing the LEO communication terminal communication power saving method described below. Further, even in a configuration without battery power (for example, a configuration connected to a commercial power source), it is possible to reduce transmission power consumed when transmitting arbitrary data.

  The control unit 21 is configured to derive transmission timing and transmission output for transmitting arbitrary data from the own terminal to the LEO satellite constellation, based on various information stored in the storage unit 22. In this derivation process, at least the satellite orbit information of the LEO satellite 100 which will pass above the terminal from now on and the position information of the own terminal are used. That is, the control unit 21 determines transmission timing and transmission output of arbitrary data which can be assumed to be suitable based on the position information (position coordinates) of the own terminal with reference to the satellite orbit information as transmission conditions. In addition, regarding this determination, it is desirable that the control unit 21 determine the transmission conditions by referring to one or more indexes associated with the satellite as the communication destination. In the present embodiment, the antenna of the LEO communication terminal 20 will be described as being maintained horizontal to the ground surface. It is not necessary to maintain the antenna horizontally as long as the antenna movable portion and the directivity adjustment portion are provided, and the antenna orientation may be adjusted at the time of transmitting arbitrary data. Also, the antenna direction may be fixedly held substantially at the zenith as a structure without the need for power consumption. For example, if a pedestal (for example, a 3-axis structure of a gyroscope) freely rotating in any direction is incorporated in the LEO terminal housing and the antenna (directivity) is always kept upward in that structure, the antenna (directed It becomes possible to direct sex). In addition, the control unit 21 may use the gyro sensor, the geomagnetic sensor, the acceleration sensor, or the like to calculate the antenna direction or the tilt and calculate the angle of attack.

  The storage unit 22 stores, together with arbitrary data transmitted via the LEO satellite constellation, position information of the own terminal, satellite orbit information of each LEO satellite 100 received via the communication unit 23, various indexes, etc. .

  The communication unit 23 is configured to include at least a transmission unit 23A and a reception unit 23B. The transmitting unit 23A transmits communication waves to the LEO satellites 100 that constitute the LEO satellite constellation. The receiver 23B receives communication waves from the LEO satellites 100 that constitute the LEO satellite constellation. The communication unit 23 may be provided with an interface for short distance wireless communication / wire communication communication / carrier connection interface as needed in addition to the satellite communication transmission / reception unit.

  Here, transmission condition setting processing (transmission timing adjustment processing, transmission output adjustment processing, and the like) of arbitrary data will be exemplified and described.

  First, with regard to transmission timing adjustment processing of arbitrary data, transmission conditions can be determined by operating the control unit 21 as follows. Inter-satellite terminals are determined by the control unit 21 according to the satellite orbit information of the next incoming LEO satellite 100 and the position coordinates of the own terminal within the communicable range of the next incoming LEO satellite 100 and transmission of arbitrary data. It suffices to select the timing that satisfies the condition that the relative distance of D becomes shorter. At the same time, the control unit 21 determines the transmission of arbitrary data according to the satellite orbit information of the LEO satellite 100 flying next and the position coordinates of the own terminal, and the angle of attack at which the next flying LEO satellite is viewed becomes higher It suffices to select the timing that satisfies the condition. It is desirable that these two conditions work both rather than adopting only one. In addition, it is desirable to set the lowest angle and reflect it in the determination of the transmission conditions for the angle of attack where the LEO satellite 100 can be seen.

  FIG. 4 is an explanatory view schematically showing the relationship between the satellite orbit and the terminal position in the power saving method using the satellite orbit and the own terminal position. In this figure, it is assumed that the LEO satellite 100 that can communicate at about the zenith (high angle of attack) of its own terminal is flying. In this figure, an area satisfying the condition that the relative distance between the satellite terminals becomes shorter in the orbit of the next incoming LEO satellite 100 is marked. When there are a plurality of areas satisfying this condition, the communication timing may be determined according to the condition that the angle of attack is higher.

  Further, the control unit 21 transmits arbitrary data within the communicable range of the LEO satellites 100 flying within a predetermined time and the satellite orbit information of the LEO satellites 100 flying within a predetermined time and the position of the own terminal A condition may be selected in which the relative distance between satellite terminals is shorter within the LEO satellite group flying within a predetermined time, which is obtained according to the coordinates. In addition, the control unit 21 determines the transmission of arbitrary data according to the satellite orbit information of the LEO satellites 100 flying within a predetermined time and the position coordinates of the own terminal, and the satellites of the LEO satellite flying within the predetermined time It is also possible to select a condition in which the angle of attack seen is higher. It is desirable that both of these two conditions work more than adopting only one of them. Note that the predetermined time is a time determined by the time when the own terminal wants to send arbitrary data, or a time specified by a service vendor with an index, and may be a specified value. For example, if one hour is set, the LEO communication terminal 20 autonomously sets power saving transmission of arbitrary data using any one of the LEO satellites 100 flying in one hour.

  FIG. 5 is another explanatory view schematically showing the relationship between the satellite orbit and the terminal position in the power saving method using the satellite orbit and the own terminal position. In this figure, it is assumed that the LEO satellites 100 which can communicate within a predetermined time passing through a plurality of orbits are flying. In this figure, areas which satisfy the condition that the relative distance between the satellite terminals becomes shorter in each orbit are marked. When there are a plurality of areas satisfying this condition, the communication timing may be determined according to the condition that the angle of attack is higher.

  On the other hand, with regard to the process of adjusting the transmission output, the transmission condition can be determined by operating the control unit 21 as follows. The control unit 21 may determine the transmission output at the time of transmission of the arbitrary data to be a specified value based on the relative distance between the satellite terminals at the transmission timing which can be obtained according to the satellite orbit information and the position coordinates of the own terminal. At the same time, the control unit 21 determines the transmission output at the time of transmission of arbitrary data as a specified value based on the angle of elevation at which the LEO satellite 100 can be viewed at the transmission timing, which is determined according to the satellite orbit information and the position coordinates of the own terminal. Just do it. It is desirable that both of these two conditions work more than adopting only one of them.

  In addition, in the case of a terminal having an antenna whose directivity can be adjusted in the communication unit 23, it is possible to operate combining the antenna directivity adjustment processing for directing antenna directivity to the assumed communication destination LEO satellite at the determined transmission timing. desirable. The antenna directivity adjustment processing causes, for example, the control unit 21 to determine the directivity of the antenna of the transmitting unit 23A to the direction of the assumed communication destination LEO satellite at the transmission timing obtained according to the satellite orbit information and the position coordinates of the own terminal. Just do it. In this way, the antenna directivity can be adjusted in accordance with the direction of the suitable LEO satellite 100 determined for each communication timing, and equivalent communication is possible with good antenna characteristics even with small transmission power.

  In addition, it is desirable to combine the transmission timing adjustment processing to operate. This function works particularly effectively in a terminal equipped with a retransmission function. In the transmission timing adjustment process, for example, the transmission start timing for transmitting arbitrary data from the own terminal to the LEO satellite constellation is set in a time frame (for example, one minute) in the control unit 21 and the derived transmission timing is reached. When transmission of arbitrary data is started, the start timing at which the transmission wave containing the arbitrary data is actually transmitted may be randomly determined within a set time frame. By this means, it is possible to prevent retransmissions from overlapping with other terminals at timings such as 00 seconds, and reduce retransmissions. As a result, by reducing the re-transmission processing of the LEO terminal 20 equipped with the re-transmission function, power saving of the entire service system can be achieved as a result.

  By configuring the LEO communication terminal 20 in this manner, the LEO communication terminal 20 appropriately refers to the storage unit 22 by the control unit 21 and refers to the position information of the own terminal, the orbit information of each satellite, and the index as necessary. Etc., and it becomes possible to set transmission conditions of arbitrary data and transmit arbitrary data under the set transmission conditions.

  In addition, as a feature of the LEO satellite constellation, transmission timings suitable for power saving are obtained from the satellite group (LEO satellite constellation) by utilizing the fact that a plurality of satellites pass through the field of view (communication area) in a short time. It is also possible to derive and select a suitable transmission power.

  As a result, it is possible to provide a LEO communication terminal in which the transmission power for transmitting a communication wave containing arbitrary data toward the LEO satellite constellation is reduced for the existing LEO communication terminal.

  Next, each operation of the LEO communication service system will be shown, and a LEO communication terminal group power saving control method will be described.

  FIG. 6 is a flowchart showing an example of the satellite orbit information notification flow to the LEO communication terminals 20 group. The selection of the LEO satellites 100 (groups) to be used for each grid and each service is performed by the management station 12, and the LEO communication terminals 20 present in each grid are satellite orbit information of the selected LEO satellites 100 (groups) Only the LEO satellite constellation may be accepted. Note that all the satellite orbit information belonging to the LEO constellation may be notified to the LEO communication terminal 20 as appropriate.

  The management station 12 broadcasts satellite orbit information (group) to the group of LEO communication terminals 20 via the communication line or the like of the LEO satellite 100 (F101). An indicator or the like for each satellite may be added to the notification of the satellite orbit information (group) to the terminal group, if necessary.

  Each of the LEO communication terminals 20 that has received the notification of the satellite orbit information autonomously records the satellite orbit information in its storage unit 22 (F102).

  FIG. 7 is a flowchart showing a data collection flow for collecting arbitrary data from the LEO communication terminals 20 group. Flows F201 and F202 in FIG. 7 operate autonomously at each timing according to the role given to each LEO communication terminal 20.

  Each of the LEO communication terminals 20 collects arbitrary data according to the role of its own terminal (F201).

  The LEO communication terminal 20 derives a transmission condition for transmitting arbitrary data next using at least the satellite orbit information acquired in the satellite orbit information notification flow and the position information of the own terminal, and the LEO satellite 100 according to the transmission condition. Transmit any data collected and directed (F202).

  After collecting arbitrary data sent from each LEO communication terminal 20 via the LEO constellation, the data collection station 11 stores, analyzes arbitrary data, notifies of data update, notification of errors, etc. according to the service to be provided. Implement as appropriate (F203).

  As described above, by operating each of the LEO communication terminal power saving control methods by the LEO communication service system 1 of this embodiment, the power saving function of the LEO communication terminal group equipped with the power saving function can be effectively operated. In addition, the control station side can control using the index, and the power saving function of the entire system can be exercised.

Next, an example of a transmission condition setting flow (LEO communication terminal (group) power saving control method) for operating the power saving function of the LEO communication terminal 20 will be described.
FIG. 8 is a flowchart showing an example of a transmission condition setting flow by the LEO communication terminal 20. This flow corresponds to the processing operation of F202 in FIG.
The LEO communication terminal 20 (control unit 21) reads the acquired satellite orbit information (group) recorded in the storage unit 22 and the index of each satellite (S101).

  Next, the LEO communication terminal 20 (control unit 21) reads its own position coordinates (S102). If the LEO communication terminal 20 is moving, the own terminal position is recorded using the current position acquired in real time by the positioning means, and if the LEO communication terminal 20 is fixed, the own terminal position recorded in the storage unit 22 It may be used.

  Next, the LEO communication terminal 20 (control unit 21) calculates the distance between the satellite position coordinates and the terminal position coordinates at each point of time of the next incoming satellite and the angle of attack (S103). When selecting an optimal transmission condition from among the LEO satellites flying within a predetermined time, the LEO communication terminal 20 (control unit 21) determines the satellite position coordinates and the terminal of each point of time of each satellite flying within the predetermined time. The distance to the position coordinates and the attack angle may be calculated.

  Next, the LEO communication terminal 20 (control unit 21) selects a communication timing that takes the shortest distance between satellite terminals and satisfies the condition that the angle of attack at which the satellite can be seen becomes higher, and the transmission was at the distance between satellite terminals The power is selected, the transmission timing and transmission power derived as optimum are determined as transmission conditions, and the arbitrary data transmission conditions are reflected in the transmission method (S104).

  In addition, about the attack angle from which a satellite can be seen, it is desirable to set the lowest angle and to reflect it in determination of transmission conditions. In addition, data transmission frequency, LEO satellite used, usable modulation method / coding method / communication protocol, etc. set by the manager of the management station 12 or the service vendor are appropriately reflected in this arbitrary data transmission condition. Is desirable.

  Thereafter, the LEO communication terminal 20 transmits the collected arbitrary data to the LEO satellite 100 in accordance with the reflected arbitrary data transmission condition.

  By operating the LEO communication terminal 20 in this manner, the LEO communication terminal (group) power saving control method can be exhibited.

  Note that this LEO communication terminal power saving control method is an example, and it is possible to set the transmission timing and transmission power that can transmit arbitrary data to the LEO satellite 100 with power saving by the relationship between the satellite orbit information and the own terminal position information. It does not matter in which order the transmission conditions are derived or the settings are reflected.

  Next, a specific example of the LEO communication service system 1 will be shown, and the present LEO communication terminal group power saving control method will be described.

  The LEO satellites 100 belonging to the LEO communication system (LEO constellation) described here periodically transmit a beacon including satellite orbit information of the own satellite designated by the ground station 10. In addition, it is also possible to incorporate satellite orbit information of the subsequent LEO satellite 100 and other LEO satellites 100, and an index of each satellite into this beacon.

  The LEO communication terminal 20 appropriately estimates self-location coordinates on the earth using a GPS receiving unit or the like mounted on the own device. In addition, while waiting for data transmission of arbitrary data, the LEO communication terminal 20 waits for each beacon from each LEO satellite 100, and receives and collects satellite orbit information and various indexes of each LEO satellite 100 as appropriate.

  After the LEO communication terminal 20 acquires satellite orbit information, the relative distance to the future satellite is less than the prescribed threshold and the satellite can be viewed based on the future passing coordinates of each LEO satellite 100 and the self-location coordinates of its own terminal ( The time (transmission timing) at which the angle of attack) becomes equal to or more than the specified threshold is calculated. At the same time, the LEO communication terminal 20 is based on the relative distance between the satellite terminals at the time when the relative distance is less than the specified threshold and the satellite view angle (attack angle) is more than the specified threshold and each condition specified by the index. , Determine the transmission power of the own terminal.

  Thereafter, when the determined transmission timing (time) comes, the LEO communication terminal 20 starts transmitting arbitrary data with the determined transmission output. Note that a threshold (data transmission end distance threshold) related to the relative distance for ending data transmission is provided, and data transmission is ended when the threshold is exceeded, and the data transmission is ended before transmission of all arbitrary data ends. If the distance threshold is exceeded, the remaining arbitrary data may be sent to the next transmission timing.

  In this way, the LEO communication terminal 20 is directed to the LEO satellite constellation according to the transmission conditions suitable for the timing and the timing suitable for the timing based on the orbit information and the like of each satellite acquired from the beacon. Configure to send arbitrary data. As a result, LEO communication terminals 20 communicating with timing and transmission power that would be suitable for LEO satellite communication can be obtained.

  In other words, since arbitrary data is transmitted when communication is possible even if the transmission output is small, the power consumption of the LEO communication terminal 20 can be reduced.

  Similarly, by adding a viewing angle suitable for satellite communication as a condition, it can be expected that data transmission failure (satellite relay failure) will be reduced and the number of retransmission requests will be reduced, resulting in the LEO communication terminals 20 as a group. Power consumption can be reduced.

  LEO communication terminals are used in various applications, and are often used in areas without a mobile communication network, for example, in mountainous areas, on the sea, in disaster areas, and the like. In addition, there are many places where maintenance does not reach after installation. Furthermore, it is often used in areas where there is no commercial power source, and there are also many LEO communication terminals that operate by battery operation. On the other hand, in satellite communication, it is necessary to increase the transmission radio wave output as compared to the ground radio network, and power consumption tends to be large.

  Therefore, although the present invention has been described from various points of view as described above, in the LEO communication terminal, at least the position information of its own and the orbit information of the satellite are used to suppress communication power.

  That is, the LEO communication terminal and the LEO communication service system to which the present invention is applied transmit power for transmitting a communication wave including arbitrary data toward the LEO satellite constellation to the existing LEO communication terminal and the LEO communication service system. It can be reduced.

  Each part of the LEO communication terminal may be realized using a combination of hardware and software of the computer system. The computer system includes one or more processors and memory tailored to the desired configuration. Further, in the form of this computer system, each part develops the program according to the present invention in the above-mentioned memory, and operates hardware such as one or more processors based on this program with the execution instruction group and code group. If it will be realized. At this time, if necessary, this program may realize each part in cooperation with an operating system, a micro program, a function provided by software such as a driver, and the like. In addition, some or all of the parts of the computer system may be replaced with hardware or firmware (for example, one or more LSIs: large-scale integration, FPGA: field programmable gate array, combination of electronic elements). Similarly, only a part of each part may be replaced with hardware or firmware.

  Also, this program may be recorded non-temporarily on a recording medium and distributed. The program recorded on the recording medium is read into a memory through a wired, wireless, or recording medium itself to operate a processor or the like.

  In the present specification, recording media also include storage media, memory devices, storage devices and the like of similar terms. Examples of this recording medium include an optical disk, a magnetic disk, a semiconductor memory device, a hard disk device, and a tape medium. Further, it is desirable that the recording medium be non-volatile. Further, a combination of a volatile module (for example, RAM: Random Access Memory) and a non-volatile module (for example, ROM: Read Only Memory) may be used as the recording medium.

  The present invention has been described by exemplifying the embodiment. However, the specific configuration of the present invention is not limited to the above-described embodiment, and any changes without departing from the scope of the present invention are included in the present invention. For example, modifications such as separation and merging of block configurations and replacement of procedures in the above-described embodiment are free as long as the purpose of the present invention and the functions to be described are satisfied, and the above description does not limit the present invention.

Also, some or all of the above embodiments may be described as follows. The following appendices do not limit the present invention at all.
[Supplementary Note 1]
A receiver that receives communication waves from each LEO satellite that constitutes a Low Earth Orbit (LEO) satellite constellation;
A transmitter for transmitting communication waves to each LEO satellite constituting the LEO satellite constellation;
A storage unit that stores position information of the own terminal;
The storage unit receives, through the receiver, orbit information of an orbit traveled by at least one LEO satellite belonging to the LEO satellite constellation broadcasted from any of the LEO satellites constituting the LEO satellite constellation Control for deriving transmission timing of arbitrary data to be transmitted from the own terminal toward the LEO satellite constellation and transmission output used at the transmission timing based on the stored position information of the own terminal and the received orbit information Department,
Equipped with
Arbitrary data to be transmitted toward the LEO satellite constellation is transmitted from the transmission unit according to the transmission timing and transmission output derived by the control unit.
An LEO communication terminal characterized by

[Supplementary Note 2]
Equipped with a satellite positioning signal receiver,
The LEO communication terminal acquires position information of the own terminal recorded in the storage unit via the satellite positioning signal receiver.
The LEO communication terminal according to appendix 1, characterized in that

[Supplementary Note 3]
The control unit determines the transmission of the arbitrary data within the communicable range of the next incoming LEO satellite and in accordance with the orbit information of the next incoming LEO satellite and the position information of the own terminal, relative between the satellite terminals The LEO communication terminal according to any one of Appendices 1 or 2, characterized by selecting a transmission timing that satisfies the condition that the distance becomes shorter and / or the condition that the next coming LEO satellite can be seen sees a higher angle. .

[Supplementary Note 4]
The control unit determines transmission of the arbitrary data according to orbit information of LEO satellites flying within a predetermined time and within a communicable range of LEO satellites flying within a predetermined time, and position information of the own terminal. The condition that the relative distance between satellite terminals becomes shorter in a group of LEO satellites flying within a predetermined time and / or the condition that a viewing angle of view of the satellites becomes higher in LEO satellites flying within a predetermined time The LEO communication terminal according to any one of appendices 1 or 2, characterized in that the transmission timing to be satisfied is selected.

[Supplementary Note 5]
The control unit refers to prescribed values of a plurality of transmission outputs set in advance according to the distance between the satellite terminals, and transmits the transmission data at the time of transmission of the arbitrary data according to the relative distance between the satellite terminals at the transmission timing. The LEO communication terminal according to any one of appendices 1 to 4, characterized in that it is determined.

[Supplementary Note 6]
The transmission unit includes an antenna whose directivity can be adjusted,
The LEO communication terminal according to any one of appendices 1 to 5, wherein the control unit determines the directivity of the antenna of the transmission unit to the direction of the assumed communication destination at the calculated transmission timing.

[Supplementary Note 7]
A battery power supply for supplying power used when transmitting arbitrary data toward the LEO satellite constellation;
The LEO communication terminal according to any one of appendices 1 to 6, wherein at least the transmission unit drives the transmission output at the time of transmission of the arbitrary data with the power stored in the battery power supply unit.

[Supplementary Note 8]
The control unit
Setting a transmission timing for transmitting arbitrary data from the own terminal toward the LEO satellite constellation in a predetermined time frame satisfying a condition for selecting the transmission timing;
The timing of transmitting the transmission wave actually including the arbitrary data is randomly determined within the set time frame when reaching the derived transmission timing and starting the transmission of the arbitrary data. The LEO communication terminal according to one item.

[Supplementary Note 9]
A receiver for receiving communication waves from each of the LEO satellites constituting the LEO satellite constellation;
A transmitter configured to transmit a communication wave via an antenna whose directivity can be adjusted toward each LEO satellite constituting the LEO satellite constellation;
Satellite positioning signal receiver,
A storage unit for storing position information of the own terminal measured using the satellite positioning signal receiver;
The storage unit receives, through the receiver, orbit information of an orbit traveled by at least one LEO satellite belonging to the LEO satellite constellation broadcasted from any of the LEO satellites constituting the LEO satellite constellation Transmission timing of arbitrary data to be transmitted from the own terminal to the LEO satellite constellation based on the stored position information of the own terminal and the received orbit information, and control for deriving a transmission output used in the transmission timing Department,
Equipped with
The control unit
The transmission of the arbitrary data is determined according to the orbit information of the LEO satellites flying within a predetermined time and the position coordinates determined by the position information of the own terminal within the communicable range of the LEO satellites flying within a predetermined time. The condition that the relative distance between satellite terminals becomes shorter in the LEO satellite group flying within a predetermined time and / or the condition that the viewing angle of the satellite becomes higher in the LEO satellite flying within a predetermined time adaptively While selecting the transmission timing to satisfy
A definition based on the relative distance between satellite terminals of transmission timing, which determines the transmission output at the time of transmission of the arbitrary data according to the orbit information of LEO satellites flying within a predetermined time and the position coordinates determined by the position information of the own terminal. Determine the value,
Further, the directivity of the antenna of the transmission unit is determined to be the direction of the assumed communication destination LEO satellite at the transmission timing determined according to the orbit information of the LEO satellites flying within a predetermined time and the position coordinates determined by the position information of the own terminal. And
Furthermore, when reaching the derived transmission timing and starting transmission of the arbitrary data, the transmission timing at which the transmission wave containing the arbitrary data is actually transmitted is within a predetermined time frame that satisfies the condition for selecting the transmission timing. Decide at random
Arbitrary data to be transmitted toward the LEO satellite constellation is transmitted from the transmission unit toward the determined antenna directivity direction according to the transmission timing and the transmission output derived by the control unit.
An LEO communication terminal characterized by

[Supplementary Note 10]
A ground station that transmits, to a group of LEO satellites belonging to the LEO satellite constellation, orbit information of orbits traveled by at least one LEO satellite belonging to the LEO satellite constellation;
A data generation unit for acquiring arbitrary data to be transmitted to the ground station via the LEO satellite constellation, and a communication wave from each LEO satellite constituting the LEO satellite constellation, and a communication wave directed to each LEO satellite And a communication unit to transmit
The orbit information broadcasted from any of the LEO satellites constituting the LEO satellite constellation is accepted through the communication unit, and based on the current position information of the own terminal and the accepted orbit information, The transmission timing of arbitrary data to be transmitted toward the LEO satellite constellation and the transmission output used in the transmission timing are derived as transmission conditions, and the arbitrary data generated by the data generation unit is transmitted according to the derived transmission conditions. Send out from the department,
An LEO communication service system characterized by

[Supplementary Note 11]
A receiver for receiving communication waves from each LEO satellite constituting the LEO satellite constellation, a transmitter for transmitting communication waves to each LEO satellite constituting the LEO satellite constellation, and storage of position information of the own terminal An LEO communication terminal comprising: a storage unit; a transmission timing for transmitting arbitrary data from the own terminal toward the LEO satellite constellation; and a control unit for adjusting a transmission output used at the transmission timing,
The position information of the own terminal is prepared in advance in the storage unit,
Receiving, via the receiver, orbit information of an orbit traveled by at least one LEO satellite belonging to the LEO satellite constellation broadcasted from any of the LEO satellites constituting the LEO satellite constellation,
Prior to sending arbitrary data to be transmitted toward the LEO satellite constellation from the transmission unit, the self-device based on the position information of the own terminal stored in the storage unit and the received orbit information is used. The control unit derives a transmission timing of arbitrary data to be transmitted toward a LEO satellite constellation from a terminal and a transmission output used in the transmission timing.
Arbitrary data to be transmitted toward the LEO satellite constellation is transmitted from the transmission unit according to the transmission timing and transmission output derived by the control unit.
LEO communication terminal power saving control method characterized in that.

[Supplementary Note 12]
A receiver for receiving communication waves from each LEO satellite constituting the LEO satellite constellation, a transmitter for transmitting communication waves to each LEO satellite constituting the LEO satellite constellation, and storage of position information of the own terminal A control unit of the LEO communication terminal comprising: a storage unit; a transmission timing for transmitting arbitrary data from the own terminal toward the LEO satellite constellation; and a control unit for adjusting a transmission output used at the transmission timing,
Orbital orbit information of the orbit on which at least one LEO satellite belonging to the LEO satellite constellation, which is received from the LEO satellite constellation received via the reception unit and which is broadcast from any of the LEO satellites, and the storage unit Determine the transmission timing of arbitrary data to be transmitted from the own terminal to the LEO satellite constellation and the transmission output used in the transmission timing by reading the position information of the own terminal stored so as to reduce power consumption. Do,
A program for LEO communication terminal characterized in that.

1 LEO communication service system 10 ground station 11 data collection station (data collection means)
12 Management station (management means)
20 LEO Communication Terminal 21 Control Unit (Control Means)
22 Storage unit (storage means)
23 Communication unit (communication means)
100 LEO satellites

Claims (10)

A receiver that receives communication waves from each LEO satellite that constitutes a Low Earth Orbit (LEO) satellite constellation;
A transmitter for transmitting communication waves to each LEO satellite constituting the LEO satellite constellation;
A storage unit that stores position information of the own terminal;
The storage unit receives, through the receiver, orbit information of an orbit traveled by at least one LEO satellite belonging to the LEO satellite constellation broadcasted from any of the LEO satellites constituting the LEO satellite constellation Control for deriving transmission timing of arbitrary data to be transmitted from the own terminal toward the LEO satellite constellation and transmission output used at the transmission timing based on the stored position information of the own terminal and the received orbit information Department,
Equipped with
Arbitrary data to be transmitted toward the LEO satellite constellation is transmitted from the transmission unit according to the transmission timing and transmission output derived by the control unit.
An LEO communication terminal characterized by Equipped with a satellite positioning signal receiver,
The LEO communication terminal acquires position information of the own terminal recorded in the storage unit via the satellite positioning signal receiver.
The LEO communication terminal according to claim 1, characterized in that:   The control unit determines the transmission of the arbitrary data within the communicable range of the next incoming LEO satellite and in accordance with the orbit information of the next incoming LEO satellite and the position information of the own terminal, relative between the satellite terminals The LEO communication according to claim 1 or 2, characterized in that the transmission timing is selected to adaptively satisfy the condition that the distance becomes shorter and / or the angle at which the next incoming LEO satellite can be seen is higher. Terminal.   The control unit determines transmission of the arbitrary data according to orbit information of LEO satellites flying within a predetermined time and within a communicable range of LEO satellites flying within a predetermined time, and position information of the own terminal. The condition that the relative distance between satellite terminals becomes shorter in a group of LEO satellites flying within a predetermined time and / or the condition that a viewing angle of view of the satellites becomes higher in LEO satellites flying within a predetermined time The LEO communication terminal according to claim 1 or 2, characterized in that the transmission timing to be satisfied is selected.   The control unit refers to prescribed values of a plurality of transmission outputs set in advance according to the distance between the satellite terminals, and transmits the transmission data at the time of transmission of the arbitrary data according to the relative distance between the satellite terminals at the transmission timing. The LEO communication terminal according to any one of claims 1 to 4, characterized in that it is determined. The transmission unit includes an antenna whose directivity can be adjusted,
The LEO communication terminal according to any one of claims 1 to 5, wherein the control unit determines the directivity of the antenna of the transmission unit to the direction of the assumed communication destination at the calculated transmission timing. A receiver for receiving communication waves from each of the LEO satellites constituting the LEO satellite constellation;
A transmitter configured to transmit a communication wave via an antenna whose directivity can be adjusted toward each LEO satellite constituting the LEO satellite constellation;
Satellite positioning signal receiver,
A storage unit for storing position information of the own terminal measured using the satellite positioning signal receiver;
The storage unit receives, through the receiver, orbit information of an orbit traveled by at least one LEO satellite belonging to the LEO satellite constellation broadcasted from any of the LEO satellites constituting the LEO satellite constellation Transmission timing of arbitrary data to be transmitted from the own terminal to the LEO satellite constellation based on the stored position information of the own terminal and the received orbit information, and control for deriving a transmission output used in the transmission timing Department,
Equipped with
The control unit
The transmission of the arbitrary data is determined according to the orbit information of the LEO satellites flying within a predetermined time and the position coordinates determined by the position information of the own terminal within the communicable range of the LEO satellites flying within a predetermined time. The condition that the relative distance between satellite terminals becomes shorter in the LEO satellite group flying within a predetermined time and / or the condition that the viewing angle of the satellite becomes higher in the LEO satellite flying within a predetermined time adaptively While selecting the transmission timing to satisfy
A definition based on the relative distance between satellite terminals of transmission timing, which determines the transmission output at the time of transmission of the arbitrary data according to the orbit information of LEO satellites flying within a predetermined time and the position coordinates determined by the position information of the own terminal. Determine the value,
Further, the directivity of the antenna of the transmission unit is determined to be the direction of the assumed communication destination LEO satellite at the transmission timing determined according to the orbit information of the LEO satellites flying within a predetermined time and the position coordinates determined by the position information of the own terminal. And
Furthermore, when reaching the derived transmission timing and starting transmission of the arbitrary data, the transmission timing at which the transmission wave containing the arbitrary data is actually transmitted is within a predetermined time frame that satisfies the condition for selecting the transmission timing. Decide at random
Arbitrary data to be transmitted toward the LEO satellite constellation is transmitted from the transmission unit toward the determined antenna directivity direction according to the transmission timing and the transmission output derived by the control unit.
An LEO communication terminal characterized by A ground station that transmits, to a group of LEO satellites belonging to the LEO satellite constellation, orbit information of orbits traveled by at least one LEO satellite belonging to the LEO satellite constellation;
A data generation unit for acquiring arbitrary data to be transmitted to the ground station via the LEO satellite constellation, and a communication wave from each LEO satellite constituting the LEO satellite constellation, and a communication wave directed to each LEO satellite And a communication unit to transmit
The orbit information broadcasted from any of the LEO satellites constituting the LEO satellite constellation is accepted through the communication unit, and based on the current position information of the own terminal and the accepted orbit information, The transmission timing of arbitrary data to be transmitted toward the LEO satellite constellation and the transmission output used in the transmission timing are derived as transmission conditions, and the arbitrary data generated by the data generation unit is transmitted according to the derived transmission conditions. Send out from the department,
An LEO communication service system characterized by A receiver for receiving communication waves from each LEO satellite constituting the LEO satellite constellation, a transmitter for transmitting communication waves to each LEO satellite constituting the LEO satellite constellation, and storage of position information of the own terminal An LEO communication terminal comprising: a storage unit; a transmission timing for transmitting arbitrary data from the own terminal toward the LEO satellite constellation; and a control unit for adjusting a transmission output used at the transmission timing,
The position information of the own terminal is prepared in advance in the storage unit,
Receiving, via the receiver, orbit information of an orbit traveled by at least one LEO satellite belonging to the LEO satellite constellation broadcasted from any of the LEO satellites constituting the LEO satellite constellation,
Prior to sending arbitrary data to be transmitted toward the LEO satellite constellation from the transmission unit, the self-device based on the position information of the own terminal stored in the storage unit and the received orbit information is used. The control unit derives a transmission timing of arbitrary data to be transmitted toward a LEO satellite constellation from a terminal and a transmission output used in the transmission timing.
Arbitrary data to be transmitted toward the LEO satellite constellation is transmitted from the transmission unit according to the transmission timing and transmission output derived by the control unit.
LEO communication terminal power saving control method characterized in that. A receiver for receiving communication waves from each LEO satellite constituting the LEO satellite constellation, a transmitter for transmitting communication waves to each LEO satellite constituting the LEO satellite constellation, and storage of position information of the own terminal A control unit of the LEO communication terminal comprising: a storage unit; a transmission timing for transmitting arbitrary data from the own terminal toward the LEO satellite constellation; and a control unit for adjusting a transmission output used at the transmission timing,
Orbital orbit information of the orbit on which at least one LEO satellite belonging to the LEO satellite constellation, which is received from the LEO satellite constellation received via the reception unit and which is broadcast from any of the LEO satellites, and the storage unit Determine the transmission timing of arbitrary data to be transmitted from the own terminal to the LEO satellite constellation and the transmission output used in the transmission timing by reading the position information of the own terminal stored so as to reduce power consumption. Do,
A program for LEO communication terminal characterized in that.

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