JP6175885B2 - Optical space communication system, mobile station, and control method - Google Patents

Description

The present invention relates to an optical space communication system, a mobile station, and a control method for performing optical space communication using a light beam propagating in free space.

  Observations are made with various observation devices mounted on mobile objects such as artificial satellites and airplanes, and information obtained by the observation devices is fixed to the ground from a communication station (hereinafter referred to as a mobile station) mounted on the mobile object. Transmission to a communication station (hereinafter, referred to as a fixed station) is generally performed. In recent years, the amount of information transmitted and received between a mobile station and a fixed station has increased with the improvement in performance of observation equipment. Practical use of an optical space communication system that performs optical space communication between a mobile station and a fixed station using an optical beam propagating in free space in order to cope with an increase in the amount of information transmitted and received between the mobile station and the fixed station Is being promoted.

  In an optical space communication system, a mobile station and a fixed station each include a directional optical antenna for transmitting and receiving a light beam. In order to realize high-speed communication between the mobile station and the fixed station, it is necessary to oppose the optical antenna of the mobile station and the optical antenna of the fixed station with high accuracy. Therefore, the optical processing of the optical antenna of the mobile station and the optical axis of the optical antenna of the fixed station coincided from the opposing processing in which the optical antenna of the mobile station and the optical antenna of the fixed station are substantially opposed to each other. After the acquisition process for setting the acquisition state is performed, optical space communication between the mobile station and the fixed station is started.

  In the acquisition process, a method is generally used in which the reception intensity of the light beam from the opposite station is detected by an optical sensor provided in the mobile station or fixed station, and the directivity direction of the optical antenna is adjusted according to the detection result. .

  Further, in the facing process, for example, as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 63-271182), the route of the mobile body is predicted, and the optical antenna of the fixed station is determined according to the predicted route. A technique for adjusting the pointing direction is used.

JP-A 63-271182

  In the technique disclosed in Patent Document 1, when the moving body can predict a route such as an artificial satellite, the pointing direction of the optical antenna of the fixed station can be adjusted according to the predicted route. it can. However, in the technique disclosed in Patent Document 1, when the moving body is an aircraft or helicopter whose route is not necessarily determined, the route of the moving body cannot be predicted. There is a problem that it is difficult to make the antenna substantially opposite to the antenna.

An object of the present invention is to provide an optical space that can increase the possibility that an optical antenna of a mobile station that performs optical space communication and an optical antenna of a fixed station are substantially opposed to each other even when the mobile route of the mobile station is indefinite. A communication system, a mobile station, and a control method are provided.

In order to achieve the above object, an optical space communication system of the present invention includes:
An optical space communication system comprising a fixed station and a mobile station that performs optical space communication with the fixed station by a light beam propagating in free space,
The mobile station
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station control unit for transmitting to a fixed station,
The fixed station is
A third communication unit including a second optical antenna capable of adjusting a directivity direction, which transmits and receives the optical beam to and from the mobile station;
A fourth communication unit for receiving information transmitted from the mobile station;
When the fourth communication unit receives the mobile station information, the directivity direction of the second optical antenna is determined based on the mobile station information, and the directivity direction of the second optical antenna is set in the determined direction. a fixed station control unit for adjusting the possess,
The mobile station
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna; In addition,
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. Transmitting the modulated light beam to the fixed station,
The fourth communication unit includes an optical sensor having a lower directivity than the second optical antenna, and receives an optical beam transmitted from the mobile station by the optical sensor .

In order to achieve the above object, the mobile station of the present invention is a mobile station that performs optical space communication with a fixed station by a light beam propagating in free space,
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station controller that transmits to a fixed station;
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna; Have
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. The modulated light beam is transmitted to the fixed station.

In order to achieve the above object, the control method of the present invention comprises:
A control method performed in an optical space communication system including a fixed station and a mobile station that performs optical space communication between the fixed station and an optical beam propagating in free space,
The mobile station
Store the location information of the fixed station in the fixed station information storage unit,
Detect the position of your station in the detection unit,
Transmitting and receiving the light beam to and from the fixed station in a first communication unit including a first optical antenna capable of adjusting a directivity direction,
Send information to the fixed station in the second communication unit,
When performing optical space communication with the fixed station by the mobile station control unit, the position information of the fixed station stored in the fixed station information storage unit and the mobile station detected by the detection unit And determining the directivity direction of the first optical antenna based on the position, adjusting the directivity direction of the first optical antenna to the determined direction, and mobile station information indicating the position of the mobile station 2 communication unit to transmit to the fixed station,
The fixed station is
Transmitting and receiving the light beam with the mobile station in a third communication unit having a second optical antenna capable of adjusting the directivity direction,
Receiving information transmitted from the mobile station in a fourth communication unit;
When the fourth communication unit receives the mobile station information, the fixed station control unit determines the directivity direction of the second optical antenna based on the mobile station information, and the second direction is determined in the determined direction. Adjust the directivity direction of the optical antenna,
The mobile station
A mobile station optical transmission unit including a first light source that outputs a light beam modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna. And
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. Transmitting the modulated light beam to the fixed station,
The fourth communication unit includes an optical sensor having a lower directivity than the second optical antenna, and receives an optical beam transmitted from the mobile station by the optical sensor.

  According to the present invention, it is possible to increase the possibility that an optical antenna of a mobile station that performs optical space communication and an optical antenna of a fixed station are substantially opposed to each other even when the mobile route of the mobile station is indefinite.

It is a block which shows the structure of the optical space communication system of the 1st Embodiment of this invention. 2 is a flowchart showing an outline of the operation of the optical space communication system shown in FIG. 1. It is a flowchart which shows the detail of determination operation | movement of the fixed station of communication object in step S10 shown in FIG. 4 is a flowchart showing details of an adjustment operation of the directivity direction of the optical antenna of the mobile station in step S20 shown in FIG. 3 is a flowchart showing details of an operation of transmitting mobile station information to a fixed station in step S30 shown in FIG. It is a flowchart which shows the detail of reception operation | movement of the mobile station information in step S40 shown in FIG. It is a flowchart which shows the detail of the directivity direction adjustment operation | movement of the optical antenna of a fixed station in step S40 shown in FIG. It is a block diagram which shows the structure of the optical space communication system of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the optical space communication system of the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the optical space communication system of the 4th Embodiment of this invention. 11 is a flowchart showing details of an adjustment operation of the directivity direction of the optical antenna of the mobile station in the optical space communication system shown in FIG. 10. It is a block diagram which shows the structure of the optical space communication system of the 5th Embodiment of this invention. 13 is a flowchart showing details of the adjustment operation of the directivity direction of the optical antenna of the fixed station of the optical space communication system shown in FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated with reference to drawings.

(First embodiment)
FIG. 1 is a block diagram showing a configuration of an optical space communication system 10 according to the first embodiment of this invention.

  An optical space communication system 10 illustrated in FIG. 1 includes a mobile station 100 and a fixed station 200.

  The mobile station 100 is a communication station that is moving in the air, on the ground, or on the sea, and is mounted on a vehicle, an artificial satellite, an aircraft, a helicopter, a ship, or the like. Note that “moving” is a state in which the fixed station 200 does not know the position of the mobile station 100 at the start of the facing process. Therefore, a moving communication station is mounted not only on a mobile station that is actually moving, but also on a communication station mounted on a stationary vehicle or a helicopter that is hovering. Communication stations, and those installed on ships anchored at sea.

  The fixed station 200 is a communication station fixed on the ground. “Fixed” indicates that the mobile station 100 does not move during the facing process, and that the position of the fixed station 200 is specified by the mobile station 100 when the facing process is started. Therefore, the fixed communication station includes not only a communication station installed non-portably on the ground but also a portable communication station mounted on a vehicle or the like. However, the position of the portable communication station needs to be specified by the mobile station 100 at the start of the opposing process. Normally, a plurality of fixed stations 200 are provided.

  Next, configurations of the mobile station 100 and the fixed station 200 will be described.

  First, the configuration of the mobile station 100 will be described.

  A mobile station 100 shown in FIG. 1 includes a movement state detection unit 110, a fixed station information storage unit 120, a mobile station antenna unit 130, a mobile station optical transmission unit 140, a mobile station optical reception unit 150, and an information transmission unit. 160 and a mobile station controller 170.

  The movement state detection unit 110 is an example of a detection unit. The mobile station antenna unit 130 is an example of a first communication unit. The information transmission unit 160 is an example of a second communication unit.

  The moving state detection unit 110 includes a GPS module that receives a GPS (Global Positioning System) signal, an altitude sensor, an attitude sensor, an acceleration sensor, and the like. The latitude, longitude, altitude, moving speed, moving direction, The movement state of the mobile station 100 such as the attitude angle and the angular acceleration is detected. The moving state detection unit 110 detects at least the position (latitude, longitude, altitude) of the mobile station 100. The movement state detection unit 110 outputs the detection result to the mobile station control unit 170.

  The fixed station information storage unit 120 stores position information (latitude, longitude, altitude) of at least one fixed station 200. In addition, the fixed station information storage unit 120 includes an individual identification name that can identify the fixed station 200, an individual identification number that can identify the fixed station 200, an IP (Internet Protocol) address of the fixed station 200, an affiliated company of the fixed station 200, Information such as the country to which the fixed station 200 belongs may be stored. Such information can be used for determining whether or not communication with the fixed station 200 is possible. The fixed station information storage unit 120 includes a storage device such as an HDD (Hard Disk Device) or an SSD (Solid State Drive).

  The mobile station antenna unit 130 includes an optical antenna 131 and a drive mechanism 132.

  The optical antenna 131 is a directional optical antenna that transmits and receives a light beam to and from the fixed station 200. The optical antenna 131 is an example of a first optical antenna.

  The drive mechanism 132 is a mechanism for adjusting the direction of the optical antenna 131. The direction of the optical antenna 131 can be adjusted by adjusting the direction of the optical antenna 131 by the drive mechanism 132. The drive mechanism 132 has, for example, a biaxial gimbal structure that can rotate around the pitch axis and the yaw axis. The optical antenna 131 is installed on a biaxial gimbal, and the optical antenna 131 can be rotated about the pitch axis and the yaw axis by controlling the driving of the biaxial gimbal. By rotating the optical antenna 131, that is, by changing the direction of the optical antenna 131, the directivity direction of the optical antenna 131 can be adjusted.

  The mobile station optical transmitter 140 modulates a light beam for optical space communication according to data to be transmitted by optical space communication (such as observation data of an observation device mounted on the same mobile body as the mobile station 100), The modulated light beam is transmitted via the optical antenna 131. The mobile station optical transmission unit 140 includes a light source 141 and an optical modulation unit 142. The light source 141 is an example of a first light source.

  The light source 141 outputs a light beam for optical space communication.

  The light modulation unit 142 modulates the light beam output from the light source 141 according to data to be transmitted by optical space communication, and outputs the modulated light beam to the mobile station antenna unit 130. The light beam output from the light modulation unit 142 is transmitted via the optical antenna 131.

  The mobile station light receiving unit 150 includes a light receiving sensor, and the light beam received by the optical antenna 131 is received by the light receiving sensor.

  The information transmission unit 160 transmits information to the fixed station 200 using radio waves, quasi-omnidirectional light, sound waves, and the like.

  When performing optical space communication with the fixed station 200, the mobile station control unit 170 adjusts the directivity direction of the optical antenna 131 and generates mobile station information indicating the directivity direction of the optical antenna 131 and the position of the mobile station 200. Then, the generated mobile station information is transmitted to the fixed station 200 by the information transmitting unit 160.

  The mobile station control unit 170 includes a fixed station direction calculation unit 171, a mobile station antenna control unit 172, and an information generation unit 173.

  The fixed station direction calculation unit 171 performs the optical space communication with the fixed station 200, the movement state of the mobile station 100 detected by the movement state detection unit 110, and the fixed station stored in the fixed station information storage unit 120. Based on the position information of 200, the directivity direction of the optical antenna 131 in which the optical antenna 131 and the optical antenna of the fixed station 200 are substantially opposed to each other is determined. The fixed station direction calculation unit 171 notifies the determined direction to the mobile station antenna control unit 172 and the information generation unit 173. Since the positions of the mobile station 100 and the fixed station 200 are known, the directivity direction of the optical antenna 131 in which the optical antenna 131 and the optical antenna of the fixed station 200 are substantially opposed to each other is calculated using a trigonometric function. Can do. Further, when a moving speed, a moving direction, a posture angle, an angular acceleration, and the like are detected as the moving state of the mobile station 100, the pointing direction of the optical antenna 131 can be calculated using these detection results. , Accuracy can be improved.

  The mobile station antenna control unit 172 determines the drive amount of the drive mechanism 132 in which the direction of the optical antenna 131 is directed in the direction notified from the fixed station direction calculation unit 171, and drives the drive mechanism 132 by the determined drive amount. Note that the mobile station antenna control unit 172 includes a control controller that performs PID (Proportional Integral Derivative) control, for example, and determines the drive amount of the drive mechanism 132 by this control controller.

  The information generation unit 173 generates mobile station information indicating the directivity direction of the optical antenna 131 notified from the fixed station direction calculation unit 171 and the position of the mobile station 100 indicated by the detection result of the movement state detection unit 110, The generated mobile station information is transmitted to the fixed station 200 by the information transmission unit 160.

  Here, the data size of the mobile station information is smaller than the size of data to be transmitted by optical space communication (such as observation data of an observation device mounted on the same mobile body as the mobile station 100). As described above, the information transmission unit 160 transmits information to the fixed station 200 using radio waves, quasi-omnidirectional light, sound waves, and the like. The bit rate is lower than that of optical space communication. However, since the data size of the mobile station information is smaller than the size of data to be transmitted by optical space communication, the mobile station information can be transmitted to the fixed station 200 even at a low bit rate.

  Next, the configuration of the fixed station 200 will be described.

  The fixed station 200 shown in FIG. 1 includes a fixed station antenna unit 210, a fixed station light transmission unit 220, a fixed station light reception unit 230, an information reception unit 240, and a fixed station antenna control unit 250.

  The fixed station antenna unit 210 is an example of a third communication unit. The information receiving unit 240 is an example of a fourth communication unit. The fixed station antenna control unit 250 is an example of a fixed station control unit.

  The fixed station antenna unit 210 includes an optical antenna 211 and a drive mechanism 212.

  The optical antenna 211 is a directional optical antenna that transmits and receives a light beam to and from the mobile station 100. The optical antenna 211 is an example of a second optical antenna.

  The drive mechanism 212 is a mechanism for adjusting the direction of the optical antenna 211. The orientation of the optical antenna 211 can be adjusted by adjusting the direction of the optical antenna 211 by the drive mechanism 212. The drive mechanism 212 has, for example, a biaxial gimbal structure that can rotate around the pitch axis and the yaw axis. The optical antenna 211 is installed on a biaxial gimbal, and the optical antenna 211 can be rotated about the pitch axis and the yaw axis by controlling the driving of the biaxial gimbal. By rotating the optical antenna 211, that is, by changing the direction of the optical antenna 211, the directivity direction of the optical antenna 211 can be adjusted.

  The fixed-station optical transmission unit 220 modulates the optical beam for optical space communication according to data to be transmitted by the optical space communication, and transmits the modulated light beam via the optical antenna 211. The mobile station optical transmission unit 220 includes a light source 221 and an optical modulation unit 222.

  The light source 221 outputs a light beam for optical space communication.

  The light modulation unit 222 modulates the light beam output from the light source 221 according to data to be transmitted by optical space communication, and outputs the modulated light beam to the fixed station antenna unit 210. The light beam output from the light modulation unit 222 is transmitted via the optical antenna 211.

  The fixed-station light receiving unit 230 includes a light receiving sensor, and the light beam received by the optical antenna 131 is received by the light receiving sensor.

  The information receiving unit 240 receives information transmitted from the mobile station 100 using radio waves, quasi-omnidirectional light, sound waves, and the like. Specifically, the information receiving unit 240 receives radio waves, quasi-omnidirectional light, sound waves, etc. transmitted from the mobile station 100, and converts the received radio waves, quasi-omnidirectional light, sound waves, etc. into electrical signals. And output to the information converter 250.

  When the information receiving unit 240 receives the mobile station information, the fixed station antenna control unit 250 receives the optical antenna 211 based on the position of the mobile station 100 indicated by the mobile station information and the directivity direction of the optical antenna 131 of the mobile station 100. Determine the directivity direction. In addition, the fixed station antenna control unit 250 determines the drive amount of the drive mechanism 212 in which the direction of the optical antenna 211 is directed in the determined direction, and drives the drive mechanism 212 by the determined drive amount. Note that the fixed station antenna control unit 250 includes, for example, a control controller that performs PID control, and the drive amount of the drive mechanism 212 is calculated by the control controller.

  In the present embodiment, the mobile station information will be described using an example in which information indicating the position (latitude, longitude, altitude) of the mobile station 100 and information indicating the directivity direction of the optical antenna 131 are included. However, it is not limited to this.

  The mobile station information only needs to include at least information indicating the position of the mobile station 100. By including information indicating the position of the mobile station 100 in the mobile station information, the fixed station 250 identifies the position of the mobile station 100 and adjusts the directivity direction of the optical antenna 211 toward the identified position. Thus, the optical antenna 131 of the mobile station 100 and the optical antenna 211 of the fixed station 200 can be brought into a substantially opposite state. However, due to the detection accuracy of the position of the mobile station 100 by GPS, the vibration of the mobile body, and the like, only the information indicating the position of the mobile station 100 can be used to May not be able to face each other with high accuracy. Therefore, the mobile station information includes information indicating the directivity direction of the optical antenna 131 of the mobile station 100, that is, the direction of the fixed station 200 viewed from the mobile station 100. By determining the directivity direction of the optical antenna 211 based on the directivity direction of the optical antenna 131 of the station 100, the optical antenna 131 of the mobile station 100 and the optical antenna 211 of the fixed station 200 can be opposed to each other with high accuracy.

  Further, the mobile station information may include the speed of the mobile station, the moving direction, and the like. The mobile station information includes, for example, a communication connection time desired by the mobile station 100, an individual identification name that can identify the mobile station 100, an individual identification signal that can identify the mobile station 100, an IP address of the mobile station 100, a movement Information such as the company to which the station 100 belongs and the country to which the mobile station 100 belongs may be included. These pieces of information can be used for determining whether or not communication with the mobile station 100 is possible in the fixed station 200.

  In the case where optical space communication is not performed bi-directionally between mobile station 100 and fixed station 200 and optical space communication is performed only in one direction, transmission side of mobile station 100 and fixed station 200 The communication station may not have an optical receiving unit, and the receiving communication station may not have an optical transmitting unit.

  Note that the fixed station information is input and stored in advance in the fixed station information storage unit 120, for example, before the mobile body on which the mobile station 100 is mounted starts moving.

  Next, the operation of the optical space communication system 10 of this embodiment will be described.

  FIG. 2 is a flowchart showing an outline of the operation of the optical space communication system 10.

  First, when performing optical space communication with the fixed station 200, the mobile station 100 determines the fixed station 200 to be communicated (step S10).

  Next, the mobile station 100 adjusts the directivity direction of the optical antenna 131 toward the fixed station 200 determined as the communication target (step S20).

  Next, the mobile station 100 transmits mobile station information indicating the directivity direction of the optical antenna 131 and the position of the mobile station 100 to the fixed station 200 (step S30).

  Next, the fixed station 200 receives the mobile station information transmitted from the mobile station 100 (step S40).

  Next, the fixed station 200 adjusts the directivity direction of the optical antenna 211 based on the received mobile station information (step S50). Through the processing from step S10 to step S50, the optical antenna 131 of the mobile station 100 and the optical antenna 211 of the fixed station 200 can be brought into a substantially opposite state.

  FIG. 3 is a flowchart showing details of the determining operation of the fixed station 200 to be communicated in step S10 shown in FIG.

  The movement state detection unit 110 detects the movement state of the mobile station 100 (step S11). Note that the movement state detection unit 110 detects the latitude, longitude, altitude, movement speed, movement direction, posture angle, angular acceleration, and the like of the mobile station 100 as the movement state of the mobile station 100. The movement state detection unit 110 outputs movement state information indicating the detection result to the mobile station control unit 170.

  When the movement state information is input from the movement state detection unit 110, the fixed station direction calculation unit 171 reads the position information of the fixed station 200 stored in the fixed station information storage unit 120 (step S12).

  The fixed station direction calculation unit 171 temporarily determines a fixed station to be communicated based on the movement state information and the position information of the fixed station 200 (step S13). Hereinafter, a fixed station temporarily determined as a communication target is referred to as a temporary communication partner station. Usually, since there are a plurality of fixed stations 200, the fixed station direction calculation unit 171 determines one of the plurality of fixed stations 200 as a temporary communication partner station.

  The fixed station direction calculation unit 171 determines, for example, the fixed station 200 having the shortest distance among the plurality of fixed stations 200 as the temporary communication partner station. Alternatively, priority may be set for each fixed station 200 in accordance with a plurality of parameters, and the fixed station 200 having a higher priority may be determined as a temporary communication partner station. In this case, for example, the priority of the fixed station 200 installed in an area where the weather is bad may be lowered.

  Next, the fixed station direction calculation unit 171 calculates the directivity direction of the optical antenna 131 in which the optical antenna of the temporary communication partner station and the optical antenna 131 of the mobile station 100 are substantially opposed to each other (step S14). Since the positions of the mobile station 100 and the temporary communication partner station are known, the directivity direction of the optical antenna 131 in which the optical antenna 131 and the optical antenna of the temporary communication partner station are substantially opposite to each other is calculated using a trigonometric function. can do.

  Next, the fixed station direction calculation unit 171 determines whether or not to adjust the directivity direction of the optical antenna 131 toward the temporary communication partner station (step S15). Here, the fixed station direction calculation unit 171 has a case where the calculated direction is out of the adjustable range of the directivity direction of the optical antenna 131 by the drive mechanism 132 or there is an obstacle between the temporary communication partner station. In this case, it is determined that the directivity direction of the optical antenna 131 is not adjusted toward the temporary communication partner station.

  When it is determined that the directivity direction of the optical antenna 131 is not adjusted toward the temporary communication partner station (step S15: No), the fixed station direction calculation unit 171 returns to the process of step S13 and again returns to the temporary communication partner station. To decide. Here, if there is a fixed station 200 that has already been determined as a temporary communication partner station and determined not to adjust the directivity direction of the optical antenna 131 toward the temporary communication partner station, the fixed station direction calculation unit 171 A temporary communication partner station is determined from a fixed station 200 other than the fixed station 200.

  When it is determined that the directivity direction of the optical antenna 131 is adjusted toward the temporary communication partner station (step S15: No), the fixed station direction calculation unit 171 determines the temporary communication partner station as a communication target (step S16). The process proceeds to step S20.

  FIG. 4 is a flowchart showing details of the adjustment operation of the directivity direction of the optical antenna 131 of the mobile station 100 in step S20 shown in FIG.

  When the fixed station direction calculation unit 171 determines the communication target fixed station 200, the fixed station direction calculation unit 171 notifies the mobile station antenna control unit 172 and the information generation unit 173 of the directivity direction of the optical antenna 131 calculated in step S14 (step S21). In general, since the mobile station 100 constantly changes its position, the fixed station direction calculation unit 171 calculates the directivity direction of the optical antenna 131 each time the movement state information is updated, and moves the calculated direction. Notify the station antenna control unit 172 and the information generation unit 173.

  The mobile station antenna control unit 172 adjusts the directivity direction of the optical antenna 131 to the direction notified from the fixed station direction calculation unit 171 (step S22). Specifically, the mobile station antenna control unit 172 determines the drive amount of the drive mechanism 132 in which the direction of the optical antenna 131 is directed in the notified direction, and drives the drive mechanism 132 by the determined drive amount. As described above, every time the movement state information is updated, the directivity direction of the optical antenna 131 is calculated by the fixed station direction calculation unit 171 and notified to the mobile station antenna unit 172. Each time the direction is notified from the fixed station direction calculation unit 171, the mobile station antenna control unit 172 determines the drive amount of the drive mechanism 132 and drives the drive mechanism 132 by the determined drive amount.

  FIG. 5 is a flowchart showing details of an operation of transmitting mobile station information to fixed station 200 in step S30 shown in FIG.

  When the directivity direction of the optical antenna 131 is notified from the fixed station direction calculation unit 171, the information generation unit 173 informs the notified directivity direction of the optical antenna 131 and the position of the mobile station 100 detected by the movement state detection unit 110. Is generated in a predetermined format (step S31), and is output to the information transmitter 160.

  When the mobile station information is input from the information generation unit 173, the information transmission unit 160 transmits the mobile station information to the fixed station 200 to be communicated (step S32). Here, normally, the data size of the mobile station information indicating the direction of the optical antenna 131 and the position of the mobile station is small. Therefore, since the mobile station information can be transmitted to the fixed station 200 at a low bit rate, it can be transmitted by radio waves, quasi-omnidirectional light, sound waves, and the like. However, the timing at which the fixed station 200 receives the information transmitted from the mobile station 100 is not known from the mobile station 100. Further, since the position of the mobile station 100 is constantly changing, the mobile station information is updated as needed. Therefore, the information transmission part 160 transmits mobile station information intermittently.

  Next, the mobile station optical transmitter 140 transmits a light beam via the optical antenna 131 (step S33). However, since an optical link with the fixed station 200 has not been established at this stage, the light beam output from the light source 141 is transmitted through the optical antenna 131 without being modulated by the light modulation unit 142.

  In addition, the process of step S33 and the process of step S31 and step S32 may be performed independently. Therefore, as shown in FIG. 5, after the processing of step S31 and step S32 is performed, the processing of step S33 may be performed, or in parallel with the processing of step S31 and step S32, the processing of step S33. The process of step S31 and step S32 may be performed after the process of step S33 is performed.

  FIG. 6 is a flowchart showing details of the mobile station information receiving operation in step S40 shown in FIG.

  The information receiving unit 240 receives mobile station information transmitted from the mobile station 100 by radio waves, quasi-omnidirectional light, sound waves, etc. (step S41).

  Next, the information receiving unit 240 converts the received radio waves, quasi-omnidirectional light, sound waves, and the like into electrical signals (step S42) and outputs them to the information conversion unit 250.

  FIG. 7 is a flowchart showing details of the adjustment operation of the directivity direction of the optical antenna 211 of the fixed station 200 in step S40 shown in FIG.

  The fixed station antenna control unit 250 is fixed to the optical antenna 131 of the mobile station 100 based on the position of the mobile station 100 (shown in the mobile station information) indicated by the output signal of the information receiving unit 240 and the directivity direction of the optical antenna 131. The directivity direction of the optical antenna 211 that is substantially opposite to the optical antenna 211 of the station 200 is determined, and the drive amount of the drive mechanism 212 that directs the directivity direction of the optical antenna 211 in the determined direction is determined (step S51).

  Next, the fixed station antenna control unit 250 drives the drive mechanism 212 by the determined control amount (step S52).

  Next, the fixed station light transmission unit 220 transmits a light beam via the optical antenna 211 (step S53). However, since an optical link with the mobile station 100 has not been established at this stage, the optical beam output from the light source 221 is transmitted via the optical antenna 211 without being modulated by the optical modulation unit 222.

  In addition, the process of step S53 and the process of step S51 and step S52 may be performed independently. Therefore, as shown in FIG. 7, after the processing of step S51 and step S52 is performed, the processing of step S53 may be performed, or in parallel with the processing of step S51 and step S52, the processing of step S53. The process of step S51 and step S52 may be performed after the process of step S53 is performed.

  As described above, the processing shown in FIGS. 2 to 7 is performed, whereby the optical antenna 131 of the mobile station 100 and the optical antenna 211 of the fixed station 200 can be brought into a substantially opposite state.

  As described above, according to the present embodiment, the mobile station 100 stores the position information of the fixed station 200, and acquires the position information of the mobile station 100 when performing optical space communication with the fixed station 200. Based on the acquired position information of the mobile station 100 and the stored position information of the mobile station 200, the directivity direction of the optical antenna 131 is determined, the directivity direction of the optical antenna 131 is adjusted to the determined direction, and Mobile station information indicating the position of the station 100 is transmitted to the fixed station 200 by the information transmission unit 160. In addition, the fixed station 200 receives the mobile station information transmitted from the mobile station 100 by the information receiving unit 240 and, based on the position of the mobile station 100 indicated by the received mobile station information, the directivity direction of the optical antenna 211. And the directivity direction of the optical antenna 211 is adjusted to the determined direction.

Therefore, even when the mobile route of the mobile station 100 is indefinite, it is possible to increase the possibility that the optical antenna of the mobile station 100 and the optical antenna of the fixed station 200 are in a substantially opposite state (second embodiment).
FIG. 8 is a block diagram showing a configuration of an optical space communication system 10A according to the second embodiment of this invention. In FIG. 8, the same components as those in FIG.

  The optical space communication system 10A of the present embodiment is different from the optical space communication system 10 of the first embodiment in that the mobile station 100 is changed to the mobile station 100A, and the fixed station 200 is changed to the fixed station 200A. The point is different.

  The mobile station 100 </ b> A is different from the mobile station 100 in that the information transmission unit 160 is changed to the information transmission unit 310. In the first embodiment, the mobile station transmission unit 160 has been described as performing wireless communication with the fixed station 200 using radio waves, quasi-omnidirectional light, sound waves, and the like. However, in the present embodiment, information transmission is performed. It is assumed that unit 310 performs optical space communication with fixed station 200A using a light beam propagating in free space.

  The information transmission unit 310 includes a light source 311 and a light modulation unit 312. The light source 311 is an example of a second light source.

  The light source 311 outputs a light beam for optical space communication.

  The optical modulation unit 312 modulates the light beam output from the light source 311 according to the mobile station information generated by the information generation unit 173 and transmits the modulated light beam via the optical antenna 211.

  The optical axis of the light beam output from the information transmission unit 310 and the optical axis of the light beam output from the mobile station light transmission unit 140 are coaxial using a half mirror or a polarization beam splitter, or It is desirable that the parallel paraxial axis be regarded as being substantially coaxial at a distance.

  The fixed station 200A is different from the fixed station 200 in that the information receiving unit 240 is changed to the information receiving unit 320.

  The information receiving unit 240 has a light receiving sensor with low directivity, receives the light beam transmitted by the information transmitting unit 310 (light beam modulated according to mobile station information), and converts it into an electrical signal. .

  As described above, according to the present embodiment, mobile station information is transmitted and received between the mobile station 100A and the fixed station 200A by optical space communication.

  Therefore, the delay can be reduced as compared with transmission / reception of mobile station information by radio waves or sound waves, and the possibility that the optical antenna 131 of the mobile station 100A and the optical antenna 211 of the fixed station 200A are substantially opposed to each other is further increased. Can be increased.

(Third embodiment)
FIG. 9 is a block diagram showing a configuration of an optical space communication system 10B according to the third embodiment of the present invention. In FIG. 9, the same components as those in FIG. 8 are denoted by the same reference numerals, and description thereof is omitted.

  The optical space communication system 10B of the present embodiment is different from the optical space communication system 10A of the second embodiment in that the mobile station 100A is changed to the mobile station 100B.

  The mobile station 100B is different from the mobile station 100A in that the information transmission unit 310 is changed to the information transmission unit 410.

  The information transmission unit 410 is different from the information transmission unit 310 in that the light source 311 is deleted and the light modulation unit 312 is changed to the light modulation unit 411.

  The light modulation unit 411 modulates the light beam output from the light source 141 according to the mobile station information generated by the information generation unit 173, and transmits the modulated light beam via the optical antenna 211.

  As described above, according to the present embodiment, mobile station information is transmitted and received between the mobile station 100B and the fixed station 200A by optical space communication.

  Therefore, the delay can be reduced as compared with transmission / reception of mobile station information by radio waves or sound waves, and the possibility that the optical antenna 131 of the mobile station 100A and the optical antenna 211 of the fixed station 200A are substantially opposed to each other is further increased. Can be increased. Further, by sharing the light source between the mobile station optical transmission unit 140 and the information transmission unit 410, the number of parts can be reduced and the cost can be reduced.

(Fourth embodiment)
FIG. 10 is a block diagram showing a configuration of an optical space communication system 10C according to the fourth embodiment of this invention. In FIG. 10, the same components as those in FIG.

  The optical space communication system 10C of the present embodiment is different from the optical space communication system 10 of the first embodiment in that the mobile station 100 is changed to a mobile station 100C.

  The mobile station 100C is different from the mobile station 100 in that the mobile station imaging unit 510 is added and the mobile station control unit 170 is changed to the mobile station control unit 520.

  The mobile station control unit 520 is different from the mobile station control unit 170 in that the fixed station direction calculation unit 171 is changed to the fixed station direction calculation unit 521, and the mobile station antenna control unit 172 is changed to the mobile station antenna control unit 522. It is different from the changed point.

  The mobile station photographing unit 510 includes a camera and a telephoto optical system, and is installed so as to be able to photograph in the direction of the optical antenna 131. For example, the mobile station imaging unit 510 is attached to the drive mechanism 132 so that the imaging direction is adjusted in accordance with the adjustment of the directivity direction of the optical antenna 131 by the drive mechanism 132. The mobile station imaging unit 510 may have a function of changing the telephoto magnification.

  The fixed station direction calculation unit 521 is based on the movement state of the mobile station 100C detected by the movement state detection unit 110 and the position information of the fixed station 200 stored in the fixed station information storage unit 120. And the calculated direction is notified to the mobile station antenna control unit 522. Also, the fixed station direction calculation unit 521 causes the mobile station imaging unit 510 to perform imaging when the directivity direction of the optical antenna 131 is adjusted by the mobile station antenna control unit 522 in response to the notification. Further, the fixed station direction calculation unit 521 performs image processing of the captured image by the mobile station imaging unit 510, extracts the fixed station 200 included in the captured image, and extracts the direction of the extracted fixed station 200 and the direction of the optical antenna 131. And the mobile station antenna control unit 522 is notified of the calculated error.

  Also, the fixed station direction calculation unit 521 uses the error calculated from the captured image of the mobile station imaging unit 510 as the directivity direction of the optical antenna 131 calculated based on the movement state of the mobile station 100C and the positional information of the fixed station 200. The information generation unit 173 is notified based on the corrected direction as the directivity direction of the optical antenna 131.

  The mobile station antenna control unit 522 determines the drive amount of the drive mechanism 132 in which the pointing direction of the optical antenna 131 is directed in the direction notified from the fixed station direction calculation unit 521, and drives the drive mechanism 132 by the determined drive amount. Also, when the mobile station antenna control unit 522 is notified of an error between the direction of the fixed station 200 and the directivity direction of the optical antenna 131 from the fixed station direction calculation unit 521, the directivity direction of the optical antenna 131 is changed to the fixed station direction calculation unit. A drive amount of the drive mechanism 132 that is directed to cancel the error notified from the 521 is calculated, and the drive mechanism 132 is driven by the calculated drive amount.

  Next, the operation of the optical space communication system 10C of the present embodiment will be described.

  FIG. 11 is a flowchart showing details of the adjustment operation of the directivity direction of the optical antenna 131 of the mobile station 100C in the optical space communication system 10C. In FIG. 11, processes similar to those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

  In step S22, after the mobile station antenna control unit 172 adjusts the directivity direction of the optical antenna 131, the fixed station direction calculation unit 521 causes the mobile station imaging unit 510 to perform imaging (step S201).

  Next, the fixed station direction calculation unit 521 performs image processing of the captured image of the mobile station imaging unit 510 and extracts the fixed station 200 included in the captured image. In addition, since the directivity direction of the optical antenna 131 is directed to the direction calculated based on the movement state of the mobile station 100C and the position information of the fixed station 200 by the processing in step S21 and step S22, the calculation result is incorrect. If there is no, the fixed station 200 is included in the captured image of the mobile station imaging unit 510. If the fixed station 200 is not included in the captured image of the mobile station imaging unit 510, the fixed station direction calculation unit 521 returns to the process of step S21, for example.

  When the fixed station 200 is extracted from the captured image of the mobile station imaging unit 510, the fixed station direction calculation unit 521 calculates an error between the extracted direction of the fixed station 200 and the directivity direction of the optical antenna 131 (step S202). The mobile station antenna control unit 522 is notified of the error.

  The mobile station antenna control unit 522 determines the drive amount of the drive mechanism 132 so that the directivity direction of the optical antenna 131 is in a direction to cancel the error notified from the fixed station direction calculation unit 521, and the drive mechanism 132 is moved by the determined drive amount. It drives and adjusts the directivity direction of the optical antenna 131 (step S203).

  As described above, according to the present embodiment, the mobile station 100C includes the mobile station imaging unit 510 capable of imaging the directivity direction of the optical antenna 131, the mobile station 100C moving state, the fixed station 200 position information, And the directivity direction of the optical antenna 131 is determined based on the image captured by the mobile station imaging unit 510.

  Therefore, the optical antenna of the mobile station 100C and the optical antenna 211 of the fixed station 200 can be opposed to each other with higher accuracy.

  As described above, the mobile station imaging unit 510 may have a function of changing the telephoto magnification. Usually, the distance between the mobile station 100C and the fixed station 200 is not constant. Therefore, when the mobile station imaging unit 510 has a function of changing the telephoto magnification, the telephoto magnification may be changed according to the distance between the mobile station 100C and the fixed station 200.

  In the present embodiment, the mobile station 100C has been described using an example in which the mobile station imaging unit 510 is added to the mobile station 100 of the first embodiment. However, the present invention is not limited to this. The mobile station imaging unit 510 may be added to the mobile station 100A of the second embodiment or the mobile station 100B of the third embodiment.

(Fifth embodiment)
FIG. 12 is a block diagram showing a configuration of an optical space communication system 10D according to the fifth embodiment of the present invention. In FIG. 12, the same components as those in FIG.

  The optical space communication system 10D of the present embodiment is different from the optical space communication system 10 of the first embodiment in that the fixed station 200 is changed to a fixed station 200D.

  The fixed station 200D is different from the fixed station 200 in that a fixed station imaging unit 610 is added and the fixed station antenna control unit 250 is changed to a fixed station antenna control unit 620.

  The fixed station photographing unit 610 includes a camera and a telephoto optical system, and is installed so as to be able to photograph in the direction of the optical antenna 211 of the fixed station 200D. Here, the mobile station imaging unit 610 is attached to, for example, the drive mechanism 212 so that the imaging direction is adjusted according to the adjustment of the directivity direction of the optical antenna 211 by the drive mechanism 212. Note that the fixed station imaging unit 610 may have a function of changing the telephoto magnification.

  When the information receiving unit 240 receives the mobile station information, the fixed station antenna control unit 620 receives the optical antenna 211 based on the position of the mobile station 100 indicated by the mobile station information and the directivity direction of the optical antenna 131 of the mobile station 100. Is determined, the drive amount of the drive mechanism 212 in which the directivity direction of the optical antenna 131 is directed is determined, and the drive mechanism 212 is driven by the determined drive amount. The fixed station antenna control unit 620 causes the fixed station imaging unit 610 to perform imaging after the directivity direction of the optical antenna 211 is adjusted by the drive mechanism 212. Further, the fixed station antenna control unit 620 performs image processing of the captured image of the fixed station imaging unit 610, extracts the mobile station 100 included in the captured image, and extracts the direction of the extracted mobile station 100 and the direction of the optical antenna 211. And the drive amount of the drive mechanism 212 is determined so that the directivity direction of the optical antenna 211 cancels the calculated error, and the drive mechanism 212 is driven by the determined drive amount.

  Next, operation | movement of the optical space communication system 10D of this embodiment is demonstrated.

  FIG. 13 is a flowchart showing details of the adjustment operation of the directivity direction of the optical antenna 211 of the fixed station 200D in the optical space communication system 10D. In FIG. 13, the same processes as those in FIG. 7 are denoted by the same reference numerals and description thereof is omitted.

  In step S52, the fixed station antenna control unit 620 adjusts the directivity direction of the optical antenna 211, and then causes the fixed station imaging unit 610 to perform imaging (step S501).

  Next, the fixed station antenna control unit 620 performs image processing of the captured image of the fixed station imaging unit 610, and extracts the mobile station 100 included in the captured image. In addition, since the directivity direction of the optical antenna 211 is directed to the direction calculated based on the mobile station information by the processing in step S51 and step S52, if there is no error in the calculation result, the shooting by the fixed station imaging unit 610 is performed. The mobile station 100 is included in the image. When the mobile station 100 is not included in the captured image of the fixed station imaging unit 610, the fixed station antenna control unit 620 returns to the process of step S51, for example.

  When the mobile station 100 included in the captured image of the fixed station imaging unit 610 is extracted, the fixed station antenna control unit 620 calculates an error between the extracted direction of the mobile station 100 and the pointing direction of the optical antenna 211 (step S502). .

  Next, the fixed station antenna control unit 620 determines the drive amount of the drive mechanism 212 so that the directivity direction of the optical antenna 211 is in a direction to cancel the error notified from the fixed station direction calculation unit 521, and drives by the determined drive amount. The mechanism 212 is driven to adjust the directivity direction of the optical antenna 211 (step S503). Thereafter, the fixed station antenna control unit 620 proceeds to the process of step S53.

  As described above, according to the present embodiment, the fixed station 200D includes the fixed station imaging unit 610 capable of imaging the direction of the optical antenna 211, and is based on the mobile station information and the captured image of the fixed station imaging unit 610. Thus, the directivity direction of the optical antenna 211 is determined.

  Therefore, the optical antenna of the mobile station 100 and the optical antenna 211 of the fixed station 200D can be opposed to each other with higher accuracy.

  As described above, the fixed station imaging unit 610 may have a function of changing the telephoto magnification. Usually, the distance between the mobile station 100 and the fixed station 200D is not constant. Therefore, when the fixed station imaging unit 610 has a function of changing the telephoto magnification, the telephoto magnification may be changed according to the distance between the mobile station 100 and the fixed station 200D.

  In the present embodiment, the fixed station 200D has been described using an example in which the fixed station photographing unit 610 is added to the fixed station 200 of the first embodiment. However, the present invention is not limited to this. A configuration in which a fixed station photographing unit 610 is added to the fixed station 200A of the second embodiment or the third embodiment may be used.

  Further, in the fourth and fifth embodiments, the description has been given using the example in which either one of the mobile station and the fixed station has the photographing unit. However, the present invention is not limited to this. In addition, an imaging unit may be included.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
An optical space communication system comprising a fixed station and a mobile station that performs optical space communication with the fixed station by a light beam propagating in free space,
The mobile station
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station control unit for transmitting to a fixed station,
The fixed station is
A third communication unit including a second optical antenna capable of adjusting a directivity direction for transmitting and receiving the light beam to and from the mobile station;
A fourth communication unit for receiving information transmitted from the mobile station;
When the fourth communication unit receives the mobile station information, the directivity direction of the second optical antenna is determined based on the mobile station information, and the directivity direction of the second optical antenna is set in the determined direction. An optical space communication system comprising: a fixed station control unit to adjust.

(Appendix 2)
In the optical space communication system according to attachment 1,
The mobile station
A mobile station photographing unit capable of photographing the directivity direction of the first optical antenna;
The mobile station control unit is configured to determine the direction determined based on the position information of the fixed station stored in the fixed station information storage unit and the position of the communication station acquired by the mobile station information acquisition unit. After adjusting the directivity direction of one optical antenna, an error between the direction of the fixed station and the directivity direction of the first optical antenna is calculated based on the captured image of the mobile station imaging unit, and the calculated error is The optical space communication system characterized by adjusting the directivity direction of the first optical antenna accordingly.

(Appendix 3)
In the optical space communication system according to appendix 1 or 2,
The fixed station is
A fixed station photographing unit capable of photographing the direction of the second optical antenna;
The fixed station control unit adjusts the directivity direction of the second optical antenna in a direction determined based on mobile station information received from the mobile station, and then fixes the fixed station control unit based on a captured image of the fixed station imaging unit. An optical space communication system characterized in that an error between a station direction and a directivity direction of the second optical antenna is calculated, and a directivity direction of the second optical antenna is adjusted according to the calculated error.

(Appendix 4)
In the optical space communication system according to any one of appendices 1 to 3,
The mobile station
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna; In addition,
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. Transmitting the modulated light beam to the fixed station,
The fourth communication unit includes an optical sensor having a lower directivity than the second optical antenna, and receives an optical beam transmitted from the mobile station by the optical sensor. system.

(Appendix 5)
In the optical space communication system according to attachment 4,
An optical space communication system, wherein an optical axis of a light beam output from the mobile station optical transmission unit and an optical axis of a light beam output from the second communication unit are substantially coaxial.

(Appendix 6)
In the optical space communication system according to any one of appendices 1 to 3,
The mobile station
A mobile station comprising a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam to the fixed station via the first optical antenna Further having an optical transmitter,
The second communication unit modulates the light beam output from the first light source according to the mobile station information, and transmits the modulated light beam to the fixed station via the first optical antenna. Send
The fourth communication unit includes an optical sensor having a lower directivity than the second optical antenna, and receives an optical beam transmitted from the mobile station by the optical sensor. system.

(Appendix 7)
In the optical space communication system according to any one of supplementary notes 1 to 6,
The mobile station control unit generates mobile station information further indicating the determined directivity direction of the first optical antenna, and causes the information transmission unit to transmit to the fixed station;
When the information receiving unit receives the mobile station information, the fixed station control unit, based on the position of the mobile station indicated in the mobile station information and the directivity direction of the first optical antenna, An optical space communication system characterized by determining a directivity direction of an optical antenna.

(Appendix 8)
A communication station mounted on a moving body that performs optical space communication between fixed stations by a light beam propagating in free space,
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A mobile station antenna unit having an optical antenna capable of adjusting a directivity direction for transmitting and receiving the light beam to and from the fixed station;
An information transmitter for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the communication station detected by the detection unit A mobile station control unit that determines the directivity direction of the optical antenna, adjusts the directivity direction of the optical antenna in the determined direction, and causes the information transmission unit to transmit information indicating the position of the communication station to the fixed station; And a communication station.

(Appendix 9)
In the communication station described in Appendix 8,
A mobile station photographing unit capable of photographing the directivity direction of the optical antenna;
The mobile station control unit directs the optical antenna in a direction determined based on the position information of the fixed station stored in the fixed station information storage unit and the position of the communication station detected by the detection unit. After adjusting the direction, an error between the direction of the fixed station and the directivity direction of the optical antenna is calculated based on the captured image of the mobile station image capturing unit, and the directivity direction of the optical antenna is determined according to the calculated error. A communication station characterized by adjusting.

(Appendix 10)
In the communication station described in appendix 8 or 9,
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam via the optical antenna; ,
The information transmission unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to information indicating a position of the communication station, and passes through the optical antenna. A communication station that transmits the modulated light beam to the fixed station.

(Appendix 11)
In the communication station described in Appendix 10,
An optical axis of a light beam output from the mobile station optical transmitter and an optical axis of a light beam output from the information transmitter are substantially coaxial.

(Appendix 12)
In the communication station described in appendix 8 or 9,
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam to the fixed station via the optical antenna In addition,
The information transmission unit modulates a light beam output from the first light source according to information indicating a position of the communication station, and transmits the modulated light beam to the fixed station via the optical antenna. A communication station characterized by:

(Appendix 13)
In the communication station according to any one of appendices 8 to 12,
The optical station communication unit, wherein the mobile station control unit generates information further indicating the determined direction of the optical antenna and causes the information transmission unit to transmit the information to the fixed station.

(Appendix 14)
A fixed communication station that performs optical space communication with a mobile station mounted on a mobile body using a light beam propagating in free space,
A fixed station antenna unit having an optical antenna capable of adjusting a directivity direction for transmitting and receiving the optical beam to and from the mobile station;
An information receiving unit for receiving information transmitted from the mobile station;
When the information receiving unit receives mobile station information indicating the position of the mobile station, it determines the directivity direction of the optical antenna based on the mobile station information, and adjusts the directivity direction of the optical antenna to the determined direction And a fixed station control unit.

(Appendix 15)
In the communication station described in appendix 14,
A fixed station photographing unit capable of photographing the direction of the optical antenna;
The fixed station control unit adjusts the directivity direction of the optical antenna to a direction determined based on mobile station information received from the mobile station, and then determines the direction of the mobile station based on a captured image of the fixed station imaging unit. And a directivity direction of the optical antenna are calculated, and the directivity direction of the optical antenna is adjusted according to the calculated error.

(Appendix 16)
A method for controlling a communication station mounted on a mobile body, which performs optical space communication between fixed stations by a light beam propagating in free space,
The communication station is
A mobile station antenna unit having an optical antenna capable of adjusting a directivity direction for transmitting and receiving the light beam to and from the fixed station;
An information transmission unit for transmitting information to the fixed station,
Storing location information of the fixed station;
Detect the location of your station,
When performing optical space communication with the fixed station, the pointing direction of the optical antenna is determined based on the stored position information of the fixed station and the detected position of the communication station, A control method comprising adjusting a directivity direction of the optical antenna to a determined direction and causing the information transmitting unit to transmit mobile station information indicating a position of the communication station to the fixed station.

10, 10A, 10B, 10C Optical space communication system 100, 100A, 100B, 100C Mobile station 110 Moving state detection unit 120 Fixed station information storage unit 130 Mobile station antenna unit 131 Optical antenna 132 Drive mechanism 140 Mobile station optical transmission unit 141 Light source 142 Optical Modulator 150 Mobile Station Optical Receiver 160, 310, 410 Information Transmitter 170, 520 Mobile Station Controller 171, 521 Fixed Station Direction Calculator 172, 522 Mobile Station Antenna Controller 173 Information Generator 200, 200A Fixed Station 210 Fixed Station Antenna Unit 211 Optical Antenna 212 Drive Mechanism 220 Mobile Station Optical Transmitter 221 Light Source 222 Optical Modulator 230 Fixed Station Optical Receiver 240, 320 Information Receiver 250, 620 Fixed Station Antenna Controller 311 Light Source 312, 411 Optical Modulation Part 510 Mobile station photography 610 fixed station imaging unit

Claims (9)

An optical space communication system comprising a fixed station and a mobile station that performs optical space communication with the fixed station by a light beam propagating in free space,
The mobile station
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station control unit for transmitting to a fixed station,
The fixed station is
A third communication unit including a second optical antenna capable of adjusting a directivity direction for transmitting and receiving the light beam to and from the mobile station;
A fourth communication unit for receiving information transmitted from the mobile station;
When the fourth communication unit receives the mobile station information, the directivity direction of the second optical antenna is determined based on the mobile station information, and the directivity direction of the second optical antenna is set in the determined direction. A fixed station controller to adjust,
The mobile station
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna; In addition,
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. Transmitting the modulated light beam to the fixed station,
The fourth communication unit includes an optical sensor having a lower directivity than the second optical antenna, and receives an optical beam transmitted from the mobile station by the optical sensor. system. An optical space communication system comprising a fixed station and a mobile station that performs optical space communication with the fixed station by a light beam propagating in free space,
The mobile station
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station control unit for transmitting to a fixed station,
The fixed station is
A third communication unit including a second optical antenna capable of adjusting a directivity direction for transmitting and receiving the light beam to and from the mobile station;
A fourth communication unit for receiving information transmitted from the mobile station;
When the fourth communication unit receives the mobile station information, the directivity direction of the second optical antenna is determined based on the mobile station information, and the directivity direction of the second optical antenna is set in the determined direction. A fixed station controller to adjust,
The mobile station
A mobile station comprising a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam to the fixed station via the first optical antenna It further has an optical transmitter,
The second communication unit modulates the light beam output from the first light source according to the mobile station information, and transmits the modulated light beam to the fixed station via the first optical antenna. Send
The fourth communication unit includes an optical sensor having a lower directivity than the second optical antenna, and receives an optical beam transmitted from the mobile station by the optical sensor. system. An optical space communication system comprising a fixed station and a mobile station that performs optical space communication with the fixed station by a light beam propagating in free space,
The mobile station
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station control unit for transmitting to a fixed station,
The fixed station is
A third communication unit including a second optical antenna capable of adjusting a directivity direction for transmitting and receiving the light beam to and from the mobile station;
A fourth communication unit for receiving information transmitted from the mobile station;
When the fourth communication unit receives the mobile station information, the directivity direction of the second optical antenna is determined based on the mobile station information, and the directivity direction of the second optical antenna is set in the determined direction. A fixed station controller to adjust,
The mobile station control unit generates mobile station information further indicating the determined directivity direction of the first optical antenna, and causes the information transmission unit to transmit to the fixed station;
When the information receiving unit receives the mobile station information, the fixed station control unit, based on the position of the mobile station indicated in the mobile station information and the directivity direction of the first optical antenna, An optical space communication system characterized by determining a directivity direction of an optical antenna. The optical space communication system according to any one of claims 1 to 3,
The mobile station
A mobile station photographing unit capable of photographing the directivity direction of the first optical antenna;
The mobile station control unit is configured to determine the direction determined based on the position information of the fixed station stored in the fixed station information storage unit and the position of the communication station acquired by the mobile station information acquisition unit. After adjusting the directivity direction of one optical antenna, an error between the direction of the fixed station and the directivity direction of the first optical antenna is calculated based on the captured image of the mobile station imaging unit, and the calculated error is The optical space communication system characterized by adjusting the directivity direction of the first optical antenna accordingly. The optical space communication system according to any one of claims 1 to 4,
The fixed station is
A fixed station photographing unit capable of photographing the direction of the second optical antenna;
The fixed station control unit adjusts the directivity direction of the second optical antenna in a direction determined based on mobile station information received from the mobile station, and then fixes the fixed station control unit based on a captured image of the fixed station imaging unit. An optical space communication system characterized in that an error between a station direction and a directivity direction of the second optical antenna is calculated, and a directivity direction of the second optical antenna is adjusted according to the calculated error. The optical space communication system according to claim 1.
An optical space communication system, wherein an optical axis of a light beam output from the mobile station optical transmission unit and an optical axis of a light beam output from the second communication unit are substantially coaxial. A mobile station that performs optical space communication with a fixed station by a light beam propagating in free space,
A fixed station information storage unit for storing position information of the fixed station;
A detection unit for detecting the position of the own station;
A first communication unit including a first optical antenna capable of adjusting a directivity direction, which transmits and receives the light beam to and from the fixed station;
A second communication unit for transmitting information to the fixed station;
When performing optical space communication with the fixed station, based on the position information of the fixed station stored in the fixed station information storage unit and the position of the mobile station detected by the detection unit The directivity direction of the first optical antenna is determined, the directivity direction of the first optical antenna is adjusted to the determined direction, and mobile station information indicating the position of the mobile station is transmitted to the second communication unit. A mobile station controller that transmits to a fixed station;
A mobile station optical transmitter that includes a first light source that outputs a light beam, modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna; Have
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. And transmitting the modulated light beam to the fixed station. A control method performed in an optical space communication system including a fixed station and a mobile station that performs optical space communication between the fixed station and an optical beam propagating in free space,
The mobile station
Store the location information of the fixed station in the fixed station information storage unit,
Detect the position of your station in the detection unit,
Transmitting and receiving the light beam to and from the fixed station in a first communication unit including a first optical antenna capable of adjusting a directivity direction,
Send information to the fixed station in the second communication unit,
When performing optical space communication with the fixed station by the mobile station control unit, the position information of the fixed station stored in the fixed station information storage unit and the mobile station detected by the detection unit And determining the directivity direction of the first optical antenna based on the position, adjusting the directivity direction of the first optical antenna to the determined direction, and mobile station information indicating the position of the mobile station 2 communication unit to transmit to the fixed station,
The fixed station is
Transmitting and receiving the light beam with the mobile station in a third communication unit having a second optical antenna capable of adjusting the directivity direction,
Receiving information transmitted from the mobile station in a fourth communication unit;
When the fourth communication unit receives the mobile station information, the fixed station control unit determines the directivity direction of the second optical antenna based on the mobile station information, and the second direction is determined in the determined direction. Adjust the directivity direction of the optical antenna,
The mobile station
A mobile station optical transmission unit including a first light source that outputs a light beam modulates the light beam output from the first light source, and transmits the modulated light beam via the first optical antenna. And
The second communication unit includes a second light source that outputs a light beam, modulates the light beam output from the second light source according to the mobile station information, and transmits the light beam via the first optical antenna. Transmitting the modulated light beam to the fixed station,
The control method, wherein the fourth communication unit includes an optical sensor having lower directivity than the second optical antenna, and receives the light beam transmitted from the mobile station by the optical sensor. A control method performed in an optical space communication system including a fixed station and a mobile station that performs optical space communication between the fixed station and an optical beam propagating in free space,
The mobile station
Store the location information of the fixed station in the fixed station information storage unit,
Detect the position of your station in the detection unit,
Transmitting and receiving the light beam to and from the fixed station in a first communication unit including a first optical antenna capable of adjusting a directivity direction,
Send information to the fixed station in the second communication unit,
When performing optical space communication with the fixed station by the mobile station control unit, the position information of the fixed station stored in the fixed station information storage unit and the mobile station detected by the detection unit And determining the directivity direction of the first optical antenna based on the position, adjusting the directivity direction of the first optical antenna to the determined direction, and mobile station information indicating the position of the mobile station 2 communication unit to transmit to the fixed station,
The fixed station is
Transmitting and receiving the light beam with the mobile station in a third communication unit having a second optical antenna capable of adjusting the directivity direction,
Receiving information transmitted from the mobile station in a fourth communication unit;
When the fourth communication unit receives the mobile station information, the fixed station control unit determines the directivity direction of the second optical antenna based on the mobile station information, and the second direction is determined in the determined direction. Adjust the directivity direction of the optical antenna,
The mobile station
In a mobile station optical transmitter having a first light source that outputs a light beam, the light beam output from the first light source is modulated, and the modulated light beam is transmitted via the first optical antenna. Send to the fixed station,
The second communication unit modulates the light beam output from the first light source according to the mobile station information, and transmits the modulated light beam to the fixed station via the first optical antenna. Send
The control method, wherein the fourth communication unit includes an optical sensor having lower directivity than the second optical antenna, and receives the light beam transmitted from the mobile station by the optical sensor.

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