WO2022130529A1 - 無線通信装置、無線通信システム及び無線通信方法 - Google Patents
無線通信装置、無線通信システム及び無線通信方法 Download PDFInfo
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- WO2022130529A1 WO2022130529A1 PCT/JP2020/046939 JP2020046939W WO2022130529A1 WO 2022130529 A1 WO2022130529 A1 WO 2022130529A1 JP 2020046939 W JP2020046939 W JP 2020046939W WO 2022130529 A1 WO2022130529 A1 WO 2022130529A1
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- 238000004891 communication Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 153
- 230000005855 radiation Effects 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 description 23
- 230000008569 process Effects 0.000 description 19
- 230000033001 locomotion Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000004044 response Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
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- 230000003287 optical effect Effects 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
Definitions
- the present invention relates to a wireless communication device, a wireless communication system and a wireless communication method.
- a technique has been proposed in which a flyable moving object such as an aerial drone is equipped with a receiver for receiving information, and the moving object is used to acquire information without floating a device such as an AUV on the surface of the water.
- a technology W2A-OWC: Water-to-Air Optical Wireless Communication
- an aerial radio which is a mobile body equipped with a receiver, is made to stand by in the air and information is transmitted from underwater to the air by optical wireless communication.
- the technology proposed so far has a problem that communication becomes unstable as the distance between the underwater and the aerial radio becomes longer.
- the problem is that, for example, a burst error occurs while the aerial radio cannot receive sufficient light required for data transmission.
- the aerial radio cannot receive sufficient light, for example, as the distance increases, the propagation direction of the light radiated from the underwater radio fluctuates greatly due to the fluctuation of the water surface, so that the light received by the aerial radio per unit time. It is caused by a decrease in signal strength.
- the underwater radio is a device that transmits information such as an AUV to the aerial radio.
- Non-Patent Document 1 it has been proposed to reduce fluctuations in the received light level due to fluctuations in the water surface by mounting a plurality of transmitters on an underwater radio to perform transmission diversity. More specifically, if the condition that the diameter of the beam formed by the light transmitted from a plurality of transmitters is equal to or larger than the wavelength of the water surface is satisfied, the transmission diversity using a plurality of transmitters causes stable propagation of the light. It is a technology that is possible. However, the wavelength of ocean waves is on the order of meters. Therefore, a huge number of transmitters are required to use the proposed technique. That is, in order to use the proposed technique, the device on the signal transmitting side becomes extremely large.
- the technique of transmitting information using light from underwater to the air has a problem that it is difficult to suppress the increase in size of the device on the transmitting side while stabilizing communication.
- a problem is not limited to the case where the wave carrying information from underwater to the air is light, but is also a common problem when the wave carrying information from underwater to the air is an electromagnetic wave such as light or radio wave. there were.
- such a problem was a common problem even when the wave carrying information from underwater to the air was a sound wave. Further, such a problem is not limited to the case where the underwater radio and the aerial radio are mobile bodies, but is also a common problem when at least one of the underwater radio or the aerial radio is not a mobile body.
- One aspect of the present invention is a wireless communication device including a water flow generator that controls the shape of a part of the water surface and a radiation unit that radiates a wave that carries information toward the area.
- An explanatory diagram illustrating an outline of the communication system 100 The figure which shows an example of the enlarged view of the water surface convex part in embodiment.
- the figure which shows an example of the flow of the process executed by the aerial radio 2 in an embodiment.
- FIG. 1 is an explanatory diagram illustrating an outline of the communication system 100 in the embodiment.
- the communication system 100 includes an underwater radio and an aerial radio 2.
- the underwater transceiver 1 and the aerial radio 2 exchange information wirelessly.
- the signal may be carried by any wave as long as it is a wireless signal. Therefore, the signal may be conveyed by, for example, light, electromagnetic waves other than light such as radio waves, or sound waves.
- the communication system 100 will be described by taking the case where the signal is conveyed by light as an example.
- the underwater radio 1 acquires the underwater information and transmits the acquired information to the aerial radio 2.
- the underwater radio 1 may or may not be a mobile body.
- the communication system 100 will be described by taking the case where the underwater radio 1 is a mobile body as an example.
- the underwater radio 1 is provided with a water flow generator 10.
- the water flow generator 10 generates a water flow.
- the water flow generator 10 is, for example, a water flow pump.
- the water flow F101 in FIG. 1 is an example of a water flow generated by the water flow generator 10.
- the underwater transceiver 1 forms a convex portion (hereinafter referred to as "water surface convex portion") on the water surface by generating a water flow by the water flow generator 10.
- the shape of the convex portion on the water surface is substantially the same as the shape of a mountain having one crest, for example.
- the region R1 in FIG. 1 is an example of a water surface convex portion.
- the direction of the water flow generated by the water flow generator 10 may be any direction as long as a convex portion can be formed on the water surface, and may be, for example, a direction toward the water surface.
- the underwater radio 1 does not necessarily have to be provided with only one water flow generator 10, and may be provided with a plurality of water flow generators 1.
- each water flow generator 10 may generate a water flow so that a convex portion is formed on the water surface as a result of the interference of each water flow generated by each of the water flow generators 10. Since the water flow is also a wave, the water flow generator 10 generates the water flow by controlling, for example, the phase and intensity of the wave so as to form a convex portion on the water surface.
- the underwater transceiver 1 transmits a signal in the direction from underwater to the air and toward the convex portion of the water surface.
- the underwater radio 1 transmits a radio signal, for example, in the direction from underwater to the air and from the water toward the vicinity of the center of the water surface convex portion.
- the aerial radio 2 is located in the air and receives the information transmitted by the underwater radio 1.
- the aerial radio 2 may or may not be a mobile body.
- the communication system 100 will be described by taking the case where the aerial radio 2 is a mobile body as an example.
- the convex part of the water surface is a region where the height of the waves is higher than the surrounding sea surface. Therefore, a flow is generated from the convex portion of the water surface toward the surroundings.
- the flows W101 and W102 in FIG. 1 are examples of flows from the convex portion of the water surface toward the periphery, respectively. Since the flow is generated from the convex part of the water surface toward the surroundings, it is prevented that the surrounding waves enter the convex part of the water surface.
- the wave W103 in the figure is an example of a surrounding wave. Since the invasion of the surrounding waves into the water surface convex portion is prevented, the fluctuation caused by the surrounding waves on the water surface is reduced in the water surface convex portion.
- FIG. 2 is a diagram showing an example of an enlarged view of the water surface convex portion in the embodiment.
- FIG. 2 shows that the water surface of the convex portion of the water surface has fluctuations in which the height of the water surface changes in a shorter cycle than the change in the height of the water surface of the convex portion.
- short-wavelength fluctuations occur on the sea surface at the convex part of the water surface.
- the fluctuation caused by the surrounding waves is reduced as compared with the case where there is no water surface convex portion, and the wavelength of the fluctuation is shorter than that when there is no water surface convex portion.
- the wavelength of the fluctuation is, for example, several cm to 10 cm when the water surface is the sea surface.
- the strength of the signal received by the aerial radio 2 in a unit time is reduced, and a burst error occurs while the aerial radio 2 cannot receive sufficient light required for data transmission.
- the beam diameter is the extent of the spread of the intensity distribution in the plane perpendicular to the traveling direction of waves such as light carrying a signal.
- the wavelength of the fluctuation is shorter than when there is no water surface convex part, so the minimum value of the beam diameter that satisfies the communication stability condition is smaller than the minimum value when there is no water surface convex part.
- the longer the beam diameter the larger the device on the signal transmitting side.
- An example of increasing the size of the device on the signal transmitting side is, for example, an increase in the number of signal transmitters. Therefore, in the communication system 100, it is possible to suppress the increase in size of the device on the signal transmitting side as compared with the case where there is no water surface convex portion.
- FIG. 3 is a diagram showing an example of the hardware configuration of the underwater transceiver 1 in the embodiment.
- the underwater radio 1 includes a control unit 11 including a processor 91 such as a CPU (Central Processing Unit) connected by a bus and a memory 92, and executes a program.
- the underwater radio 1 functions as a device including a water flow generator 10, a control unit 11, an underwater information acquisition unit 12, a transmission unit 13, a storage unit 14, and a propulsion unit 15 by executing a program.
- a control unit 11 including a processor 91 such as a CPU (Central Processing Unit) connected by a bus and a memory 92, and executes a program.
- the underwater radio 1 functions as a device including a water flow generator 10, a control unit 11, an underwater information acquisition unit 12, a transmission unit 13, a storage unit 14, and a propulsion unit 15 by executing a program.
- the processor 91 reads out the program stored in the storage unit 14, and stores the read program in the memory 92.
- the underwater radio 1 sets the water flow generator 10, the control unit 11, the underwater information acquisition unit 12, the transmission unit 13, the storage unit 14, and the propulsion unit 15. Functions as a device to be equipped.
- the control unit 11 controls the operation of each unit included in the underwater radio unit 1.
- the control unit 11 controls, for example, the operation of the water flow generator 10 to generate a water flow in the water flow generator 10.
- the control unit 11 records, for example, the information acquired by the underwater information acquisition unit 12 in the storage unit 14.
- the control unit 11 controls, for example, the operation of the transmission unit 13.
- the control unit 11 controls, for example, the operation of the propulsion unit 15.
- the underwater information acquisition unit 12 includes a sensor that acquires underwater information such as water pressure, water temperature, and salinity.
- the underwater information acquisition unit 12 may be configured as an interface for connecting these sensors to the underwater radio unit 1.
- the transmission unit 13 emits light that carries a signal and whose beam diameter satisfies the communication stability condition (hereinafter referred to as "signal light").
- the transmission unit 13 may be any light that carries a signal and whose beam diameter can emit light that satisfies the communication stability condition.
- the transmitter 13 may include, for example, a plurality of transmitters that emit light that carries a signal.
- the radiation of the signal light by the transmission unit 13 is the transmission of the signal by the transmission unit 13 for the aerial radio 2.
- the transmitting unit 13 is arranged so that the emitted light is directed toward the convex portion of the water surface. Therefore, the light emitted by the transmitting unit 13 goes toward the convex portion on the water surface.
- the storage unit 14 is configured by using a non-temporary computer-readable storage medium device such as a magnetic hard disk device or a semiconductor storage device.
- the storage unit 14 stores various information about the underwater radio unit 1.
- the storage unit 14 stores in advance, for example, a program for controlling the operation of each unit included in the underwater radio unit 1.
- the storage unit 14 stores, for example, the information acquired by the underwater information acquisition unit 12.
- the propulsion unit 15 gives propulsion to the underwater radio 1.
- the propulsion unit 15 is, for example, a screw.
- FIG. 4 is a diagram showing an example of the functional configuration of the control unit 11 in the embodiment.
- the control unit 11 includes a recording unit 111, a water flow generation control unit 112, a transmission control unit 113, and a propulsion control unit 114.
- the recording unit 111 records various information in the storage unit 14.
- the recording unit 111 records, for example, the information acquired by the underwater information acquisition unit 12 in the storage unit 14.
- the water flow generation control unit 112 controls the operation of the water flow generator 10.
- the transmission control unit 113 controls the operation of the transmission unit 13.
- the propulsion control unit 114 controls the operation of the propulsion unit 15.
- FIG. 5 is a diagram showing an example of a flow of processing executed by the underwater transceiver 1 in the embodiment.
- the underwater information acquisition unit 12 acquires underwater information (step S101).
- the water flow generation control unit 112 controls the operation of the water flow generator 10 to generate a water flow in the water flow generator 10 (step S102).
- step S102 a water surface convex portion is formed on the water surface.
- the transmission control unit 113 controls the operation of the transmission unit 13 to cause the transmission unit 13 to transmit a signal indicating underwater information (step S103). That is, under the control of the transmission control unit 113, the transmission unit 13 emits light that carries information in the water.
- the light emitted in step S103 propagates in the water toward the convex portion of the water surface.
- FIG. 6 is a diagram showing an example of the hardware configuration of the aerial radio 2 in the embodiment.
- the aerial radio 2 includes a control unit 21 including a processor 93 such as a CPU (Central Processing Unit) connected by a bus and a memory 94, and executes a program.
- the aerial radio 2 functions as a device including a control unit 21, a reception unit 22, a storage unit 23, a drive unit 24, a camera 25, and a position information acquisition unit 26 by executing a program.
- a control unit 21 including a processor 93 such as a CPU (Central Processing Unit) connected by a bus and a memory 94, and executes a program.
- the aerial radio 2 functions as a device including a control unit 21, a reception unit 22, a storage unit 23, a drive unit 24, a camera 25, and a position information acquisition unit 26 by executing a program.
- the processor 93 reads out the program stored in the storage unit 23, and stores the read program in the memory 94.
- the aerial radio 2 is a device including a control unit 21, a reception unit 22, a storage unit 23, a drive unit 24, a camera 25, and a position information acquisition unit 26. Functions as.
- the control unit 21 controls the operation of each unit included in the aerial radio 2.
- the control unit 21 controls, for example, the operation of the drive unit 24 to move the aerial radio 2.
- the control unit 21 controls, for example, the operation of the reception unit 22.
- the control unit 21 records, for example, the information acquired by the reception unit 22 in the storage unit 23.
- the control unit 21 controls, for example, the operations of the drive unit 24, the camera 25, and the position information acquisition unit 26 to move the own device (aerial radio 2) to the water surface convex portion.
- the receiving unit 22 receives the signal transmitted by the underwater radio unit 1. That is, the receiving unit 22 receives the light emitted by the underwater radio unit 1.
- the storage unit 23 is configured by using a non-temporary computer-readable storage medium device such as a magnetic hard disk device or a semiconductor storage device.
- the storage unit 23 stores various information about the aerial radio 2.
- the storage unit 23 stores, for example, a program for controlling the operation of each unit included in the aerial radio 2 in advance.
- the storage unit 23 stores, for example, the information acquired by the reception unit 22.
- the storage unit 23 stores in advance the values of the external parameters and the internal parameters of the camera 25 such as the orientation and the angle of view of the camera 25.
- the drive unit 24 gives a propulsive force to the aerial radio 2.
- the drive unit 24 is, for example, a propeller.
- the camera 25 is a camera that captures the surface of the water.
- the position information acquisition unit 26 acquires information indicating the position of the aerial radio 2 by using a positioning technique capable of acquiring information indicating the position of its own device (air radio 2) such as GPS (Global Positioning System). do.
- a positioning technique capable of acquiring information indicating the position of its own device (air radio 2) such as GPS (Global Positioning System). do.
- GPS Global Positioning System
- position information is referred to as position information.
- FIG. 7 is a diagram showing an example of the functional configuration of the control unit 21 in the embodiment.
- the control unit 21 includes a movement control unit 211, a reception control unit 212, and a recording unit 213.
- the movement control unit 211 controls the movement of the aerial radio 2. Specifically, the movement control unit 211 controls the movement of the aerial radio 2 by controlling the operations of the drive unit 24, the camera 25, and the position information acquisition unit 26.
- the movement control unit 211 first estimates the position of the underwater convex portion based on the image taken by the camera 25 and the position information acquired by the position information acquisition unit 26.
- the estimation is estimated, for example, by executing an estimation process.
- the position information of the aerial radio 2 is acquired by using the position information acquisition unit 26.
- it is determined whether or not there is an underwater convex portion pattern in the captured image based on the pattern of the water surface reflected in the captured image.
- the pixel that captures the underwater convex portion in the image is determined.
- the underwater convex part pattern is a pattern that satisfies the underwater convex part pattern.
- the underwater convex portion pattern condition is a predetermined condition satisfied by the pattern appearing in the captured image when the underwater convex portion is photographed. Therefore, the pixel that captures the underwater convex portion pattern is the pixel that captures the underwater convex portion.
- the position of the underwater convex portion on the earth is used by using the position information of the aerial radio 2, each value of the external parameter and the internal parameter of the camera 25, and the information indicating the pixel that captures the underwater convex portion.
- the movement control unit 211 is in the air based on the information indicating the position of the underwater convex portion on the earth estimated by the estimation process and the position information of the aerial radio 2 acquired by using the position information acquisition unit 26.
- the operation of the drive unit 24 is controlled so that the radio 2 is brought closer to the position of the underwater convex portion.
- the aerial radio 2 moves to a position above the underwater convex portion such as directly above the underwater convex portion.
- the reception control unit 212 controls the operation of the reception unit 22.
- the reception control unit 212 controls the operation of the reception unit 22 to acquire the information transmitted by the underwater radio unit 1.
- the recording unit 213 records various information in the storage unit 23.
- the recording unit 213 records, for example, the information acquired by the receiving unit 22 in the storage unit 23.
- the recording unit 213 records, for example, information indicating the position of the aerial radio 2 acquired by the position information acquisition unit 26 in the storage unit 23.
- FIG. 8 is a diagram showing an example of a flow of processing executed by the aerial radio 2 in the embodiment.
- the movement control unit 211 moves the aerial radio 2 to a position above the water surface convex portion (step S201).
- the reception control unit 212 controls the operation of the reception unit 22 so that the reception unit 22 receives the signal transmitted by the underwater radio unit 1 (step S202). That is, under the control of the reception control unit 212, the reception unit 22 receives light that carries information in the water.
- the aerial radio 2 receives light through step S201, the light received by the receiving unit 22 is the light transmitted through the underwater convex portion.
- FIG. 9 is a diagram showing an example of a flow of processing executed by the communication system 100 of the embodiment.
- the same processing as that shown in FIG. 5 or 8 will be designated by the same reference numerals as those in FIG. 5 or FIG.
- step S102 is executed after step S101.
- step S201 is executed.
- step S103 is executed.
- step S202 is executed.
- the timing at which the underwater transceiver 1 executes the process of step S103 is, for example, after a predetermined time has elapsed after the process of step S102 is executed.
- the timing at which the underwater transceiver 1 executes the process of step S103 may be a predetermined timing such as every hour.
- step S103 may be executed after the execution of step S102 and before the execution of step S201. In such a case, the process of step S103 continues to be repeatedly executed until the process of step S202 is completed.
- the communication system 100 configured in this way includes an underwater radio unit 1 that forms a water surface convex portion and transmits a signal to the formed water surface convex portion. Since the water surface convex portion can reduce the fluctuation, the probability that the signal transmitted by the underwater transceiver 1 is scattered on the water surface is reduced. Further, since the wavelength of the fluctuation generated in the convex portion of the water surface is shorter than the wavelength of the fluctuation of the water surface in which the convex portion of the water surface is not formed, the beam diameter of the light carrying the signal should be shorter than that in the case where the convex portion of the water surface is not formed. Can be done. Therefore, the communication system 100 can provide a technique for improving the stability of communication when transmitting information wirelessly from underwater to the air and suppressing the increase in size of the device on the signal transmitting side.
- the underwater transceiver 1 configured in this way forms a water surface convex portion and transmits a signal toward the formed water surface convex portion. Therefore, the underwater radio 1 can provide a technique for improving the stability of communication when transmitting information wirelessly from underwater to the air and suppressing the increase in size of the device on the signal transmitting side.
- the shape of the water surface convex portion may be, for example, a convex lens shape.
- the refractive index of water is higher than the refractive index of air
- the light emitted by the underwater radio 1 is condensed in the air. Therefore, if the aerial radio 2 is located at a position where the light emitted by the underwater radio 1 is focused, the strength of the optical signal received by the aerial radio 2 in a unit time is the strength when the water surface convex portion is not formed. It is the above strength. Therefore, when the shape of the water surface convex portion is, for example, a convex lens shape, the stability of communication in the communication system 100 is improved.
- the shape formed on the water surface by the water flow generator 10 does not necessarily have to be convex. What if the water flow generator 10 can control the shape of a part of the water surface (hereinafter referred to as "control area") to a shape that can reduce the fluctuation of the water surface in the control area by generating the water flow? It may be anything.
- the water flow generator 10 may form, for example, a concave water surface. Since the wavelength of the fluctuation generated in the water surface recess is also shorter than the wavelength of the fluctuation of the water surface in which the water surface recess is not formed, the beam diameter of the light carrying the signal can be made shorter than in the case where the water surface recess is not formed.
- the fluctuation of the water surface in the concave control region is reduced as compared with the fluctuation of the water surface in the region around the control region.
- the concave shape is formed, for example, by drawing water from the water flow generator 10 to generate a water flow from the water surface toward the water flow generator 10.
- the water flow generator 10 radiates light toward the concave control region. More specifically, the water flow generator 10 radiates light, for example, toward the bottom of a concave valley.
- the convex portion of the water surface is also an example of the control region, and the region of the concave water surface is also an example of the control region.
- the convex portion of the water surface is a region of the water surface where the flow of water flowing outward from the control region is generated.
- the concave-shaped control region is a region where water flows from the outside toward the control region. Therefore, the shape of the control region is more specifically a shape that can generate only one of the flow of water flowing outward from the control region and the flow of water flowing from the outside toward the control region. be.
- the signal transmitted by the transmission unit 13 is radiated toward the control area.
- the water surface protrusion is an example of a control area.
- the underwater radio 1 does not necessarily have to be a mobile body.
- the underwater radio 1 does not necessarily have to include the propulsion unit 15 and the propulsion control unit 114.
- the aerial radio 2 does not necessarily have to be a mobile body.
- the aerial radio 2 does not necessarily have to include a drive unit 24, a camera 25, a position information acquisition unit 26, and a movement control unit 211.
- the underwater transceiver 1 does not necessarily have to acquire only the underwater information, and the underwater transceiver 1 may acquire various information such as the information of the underwater transceiver 1 itself. Further, the underwater radio 1 does not necessarily have to transmit the underwater information to the aerial radio 2. The information transmitted by the underwater radio 1 to the aerial radio 2 may be any information. The aerial radio 2 may acquire not only the underwater information but also the underwater information as long as the information is transmitted by the underwater radio 1.
- the timing at which the underwater transceiver 1 transmits a signal may be, for example, after the following response confirmation timing.
- the response confirmation timing is a signal transmitted by the underwater radio 1 transmitting a test signal toward the water surface convex portion and receiving the test signal by the aerial radio 2 and the direction of the water surface convex portion from the aerial radio 2. This is the timing at which the underwater radio 1 receives the response signal, which is a signal transmitted toward.
- the response signal is a radio signal such as light.
- the underwater transceiver 1 transmits a data signal toward the water surface convex portion. That is, the underwater transceiver 1 confirms the response signal and then transmits the data signal toward the water surface convex portion. Since the response signal propagates more reliably in the direction of the underwater transceiver 1 as the beam diameter is wider, it is desirable that the response signal transmitted by the aerial radio 2 has a wider beam diameter.
- the underwater radio 1 is an example of a wireless communication device.
- Communication system 100 is an example of a wireless communication system.
- the transmitting unit 13 is an example of a radiating unit.
- the signal transmitted by the underwater radio 1 is an example of a signal that carries information using waves.
- the communication system 100 may be implemented by using a plurality of information processing devices connected so as to be communicable via a network.
- each functional unit included in the communication system 100 may be distributed and mounted in a plurality of information processing devices.
- each function of the communication system 100, the underwater radio 1 and the aerial radio 2 are ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), FPGA (Field Program), etc. It may be realized by using hardware.
- the program may be recorded on a computer-readable recording medium.
- the computer-readable recording medium is, for example, a flexible disk, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, or a storage device such as a hard disk built in a computer system.
- the program may be transmitted over a telecommunication line.
- 100 ... Communication system, 1 ... Underwater radio, 2 ... Aerial radio, 10 ... Water flow generator, 11 ... Control unit, 12 ... Underwater information acquisition unit, 13 ... Transmission unit, 14 ... Storage unit, 15 ... Propulsion unit, 111 ... Recording unit, 112 ... Water flow generation control unit, 113 ... Transmission control unit, 114 ... Propulsion control unit, 21 ... Control unit, 22 ... Receiver unit, 23 ... Storage unit, 24 ... Drive unit, 25 ... Camera, 26 ... Position information acquisition unit, 211 ... movement control unit, 212 ... reception control unit, 213 ... recording unit, 91 ... processor, 92 ... memory, 93 ... processor, 94 ... memory
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Abstract
Description
図1は実施形態における通信システム100の概要を説明する説明図である。通信システム100は、水中無線機1及び空中無線機2を備える。通信システム100では、水中無線機1と空中無線機2とが無線によって情報をやりとりする。信号は、無線の信号であればどのような波で搬送されてもよい。そのため、信号は、例えば光によって搬送されてもよいし、電波等の光以外の電磁波によって搬送されてもよいし、音波によって搬送されてもよい。以下、説明の簡単のため、信号が光によって搬送される場合を例に通信システム100を説明する。
ここで水面凸部の通信システム100における役割を説明する。より具体的には、水面凸部が水中無線機1と空中無線機2との間の信号のやり取りに与える影響について説明する。
水面凸部の形状は例えば凸レンズ状であってもよい。このような場合、水の屈折率の方が空気の屈折率よりも高いため、水中無線機1が放射した光は空気中において集光される。したがって、水中無線機1が放射した光の集光する位置に空中無線機2が位置すれば、単位時間に空中無線機2が受信する光信号の強さは水面凸部が形成されない場合の強度以上の強度である。そのため、水面凸部の形状は例えば凸レンズ状である場合、通信システム100における通信の安定性が向上する。
Claims (6)
- 水面の一部の領域の形状を制御する水流発生器と、
前記領域に向けて、情報を搬送する波を放射する放射部と、
を備える無線通信装置。 - 前記水流発生器によって制御される前記領域の形状は、制御領域から外に向けて流れる水の流れと制御領域に向けて外から流れ込む水の流れとのいずれか一方の流れのみを生成可能な形状である、
請求項1に記載の無線通信装置。 - 前記領域の形状は、凸である、
請求項1又は2に記載の無線通信装置。 - 前記放射部が放射する波のビーム径は、前記領域に生じるゆらぎの波長よりも長い、
請求項1から3のいずれか一項に記載の無線通信装置。 - 水面の一部の領域の形状を制御する水流発生器と、
前記領域に向けて、情報を搬送する波を放射する放射部と、
前記波を用いて情報を搬送する信号を受信する受信部と、
を備える無線通信システム。 - 水面の一部の領域の形状を制御する水流発生ステップと、
前記領域に向けて、情報を搬送する波を放射する放射ステップと、
を有する無線通信方法。
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JPH04312035A (ja) * | 1991-04-11 | 1992-11-04 | Nippon Telegr & Teleph Corp <Ntt> | 水中通信方法 |
JP2018160840A (ja) * | 2017-03-23 | 2018-10-11 | 池上通信機株式会社 | 光無線通信システム、該システム用光受信装置および光無線通信方法 |
CN109586807A (zh) * | 2018-11-09 | 2019-04-05 | 北京华夏光谷光电科技有限公司 | 空-水通讯方法及装置 |
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JPH04312035A (ja) * | 1991-04-11 | 1992-11-04 | Nippon Telegr & Teleph Corp <Ntt> | 水中通信方法 |
JP2018160840A (ja) * | 2017-03-23 | 2018-10-11 | 池上通信機株式会社 | 光無線通信システム、該システム用光受信装置および光無線通信方法 |
CN109586807A (zh) * | 2018-11-09 | 2019-04-05 | 北京华夏光谷光电科技有限公司 | 空-水通讯方法及装置 |
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