WO2013146422A1 - ヘリコプター衛星通信システム、通信装置、通信方法、及び通信プログラム - Google Patents
ヘリコプター衛星通信システム、通信装置、通信方法、及び通信プログラム Download PDFInfo
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- WO2013146422A1 WO2013146422A1 PCT/JP2013/057666 JP2013057666W WO2013146422A1 WO 2013146422 A1 WO2013146422 A1 WO 2013146422A1 JP 2013057666 W JP2013057666 W JP 2013057666W WO 2013146422 A1 WO2013146422 A1 WO 2013146422A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
- H04B7/18508—Communications with or from aircraft, i.e. aeronautical mobile service with satellite system used as relay, i.e. aeronautical mobile satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Definitions
- the present invention relates to a helicopter satellite communication system, a communication device, a communication method, and a communication program.
- Patent Document 1 discloses a helicopter satellite communication method capable of efficiently transmitting data even under a situation where a communication path is blocked by a rotor blade.
- time diversity refers to a communication method in which the same data is transmitted a plurality of times at different times, thereby reducing data loss due to the influence of a rotor blade or the like.
- the channel capacity (hereinafter referred to as “bandwidth”) is about 20 to 30% larger than the information amount per unit time of video and audio. )) Is sufficient.
- bandwidth the channel capacity
- the conventional helicopter satellite communication system employing time diversity since the same data is transmitted a plurality of times, it is necessary to secure a bandwidth several times larger than the amount of information per unit time of video and the like.
- the conventional helicopter satellite communication system has a problem that the information transmission capability of the band cannot be used efficiently.
- the present invention has been made in view of such a problem, and an object thereof is to provide a helicopter satellite communication system, a communication device, a communication method, and a communication program with high band utilization efficiency.
- a helicopter satellite communication system is a helicopter satellite communication system including a first communication device mounted on a helicopter and a second communication device that communicates with the first communication device via a satellite.
- One of the first communication apparatus and the second communication apparatus includes an encoding unit that encodes transmission target information by a predetermined error correction encoding method, and a plurality of packets of the encoded transmission target information.
- Packet interleaving means for rearranging the packet order so that packets that are consecutive in the packet order immediately after the division are not arranged continuously, and the packet rearranged by the packet interleaving means for the other communication via the satellite Transmitting means for transmitting to the apparatus, and the other communication apparatus receives the packet transmitted from the one communication apparatus via the satellite.
- packet deinterleave means for rearranging received packets in the original order, and information to be transmitted from the packets rearranged by the packet deinterleave means to decode information lost by the helicopter rotor blades.
- Decoding means for restoring.
- FIG. 1 is a block diagram of a helicopter satellite communication system according to an embodiment of the present invention. It is a functional block diagram for demonstrating the function of the control part with which a ground station communication apparatus is provided, and the control part with which a helicopter mounting communication apparatus is provided. It is a functional block diagram for demonstrating the function of the control part with which a ground station communication apparatus is provided, and the control part with which a helicopter mounting communication apparatus is provided. It is a figure for demonstrating the helicopter information memorize
- a helicopter satellite communication system 1 is a system for communication between a ground station 100 and a helicopter 200 via a communication satellite 300, as shown in FIG.
- rotor blades for providing buoyancy and propulsion to the helicopter 200 are installed at the upper part of the helicopter 200. Due to the rotation of the rotor blade, communication between the helicopter 200 and the communication satellite 300 is intermittently interrupted.
- the configuration of the helicopter satellite communication system 1 will be described.
- the helicopter satellite communication system 1 includes an information terminal 110, a ground station communication device 120, an antenna 130, an information terminal 210, a helicopter-mounted communication device 220, and an antenna 230.
- the ground station 100 is provided with an information terminal 110, a ground station communication device 120, and an antenna 130
- the helicopter 200 is provided with an information terminal 210, a helicopter-mounted communication device 220, and an antenna 230.
- the “ground station” means a land or marine facility that communicates with a facility (hereinafter simply referred to as a “satellite”) such as a communication satellite, a broadcasting satellite, or a space station. This refers to radio stations such as stations, land / ocean mobile stations.
- the ground station includes not only ground equipment designed to communicate with satellites, but also other equipment connected to the ground equipment via wire and wireless, such as relay stations, base stations, In addition, buildings, moving objects (trains, automobiles, ships, etc.) are also included.
- the configuration of the information terminal 110, the ground station communication device 120, and the antenna 130 installed in the ground station 100 will be described.
- the information terminal 110 is, for example, a device for communication between an operator or the like in a ground station and a pilot or the like who controls a helicopter.
- the information terminal 110 includes an information terminal such as an operation panel, a camera, a microphone, a monitor, and an earphone.
- the information terminal 110 is, for example, “video” captured by a camera, “sound” acquired by a microphone, “control / monitoring information” output from an operation panel (for example, shooting instruction information or camera remote operation information). And the like are transmitted to the ground station communication device 120.
- the ground station communication device 120 is a device for communicating with the helicopter-mounted communication device 220 via the communication satellite 300.
- the ground station communication device 120 includes an external interface 121, a control unit 122, a transmission unit 123, a reception unit 124, and a storage unit 125.
- the external interface 121 includes an external device connection interface such as a LAN (Local Area Network) device or a USB (Universal Serial Bus) device.
- the external interface 121 communicates with the information terminal 110 via a communication cable or wireless.
- the control unit 122 includes a processing device such as a processor.
- the control unit 122 operates according to a program stored in a ROM (Read Only Memory) or a RAM (Random Access Memory) (not shown), and executes various operations including “information transmission processing” and “information reception processing” described later. .
- the control unit 122 operates according to the “information transmission process”, and functions as a data multiplexing unit 122a, an encoding unit 122b, a blocking period acquisition unit 122c, a packet interleaving unit 122d, and a modulation unit 122e as shown in FIG. To do.
- control unit 122 operates according to the “information reception process”, thereby functioning as a demodulation unit 122f, a packet deinterleave unit 122g, a decoding unit 122h, and a data separation unit 122i as illustrated in FIG. These functions will be described later in the description of “information transmission process” and “information reception process”.
- the transmission unit 123 includes a frequency converter, an amplifier, and the like.
- the transmission unit 123 converts the electrical signal output from the control unit 122 into an electrical signal in a satellite communication frequency band (for example, a microwave band of 3 GHz to 30 GHz or a millimeter wave band of 30 GHz to 300 GHz).
- the amplified electrical signal is amplified and output to the antenna 130.
- the receiving unit 124 includes an amplifier, a frequency converter, and the like.
- the receiving unit 124 amplifies the electrical signal output from the antenna 130, converts the amplified electrical signal into an electrical signal in a frequency band requested by the control unit 122, and outputs the electrical signal to the control unit 122.
- the storage unit 125 includes a storage device capable of reading and writing data, such as a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), a flash memory, and a hard disk. As shown in FIG. 5, the storage unit 125 stores various types of data such as “helicopter information”.
- Helicopter information is information for each helicopter model, and is information that stores the timing at which the communication path is blocked by the rotor blades of the corresponding helicopter.
- the helicopter information includes, for example, “model information” indicating the model of the helicopter and “blocking period” in which communication is blocked by the rotor blades of the helicopter specified by the model information (for example, (a) in FIG. 6) Period) and a “communication period” in which communication is possible (for example, the period (b) shown in FIG. 6) is stored.
- the antenna 130 includes a satellite communication antenna (for example, a parabolic antenna) that transmits radio waves to and receives radio waves from the satellites.
- the antenna 130 converts the electrical signal input from the transmission unit 123 into a radio wave and transmits it to the communication satellite 300. Further, the antenna 130 converts the radio wave received from the communication satellite 300 into an electric signal and outputs it to the receiving unit 124.
- the information terminal 210 is, for example, a device for communication between the operator of the helicopter 200 and the operator of the ground station 100.
- the information terminal 210 includes an information terminal such as an operation panel, a camera, a microphone, a monitor, and an earphone.
- the information terminal 210 transmits, for example, “video” captured by the camera, “sound” acquired by the microphone, “control / monitoring information” output from the operation panel, and the like to the helicopter-equipped communication device 220.
- the helicopter-mounted communication device 220 is a device for communicating with the ground station communication device 120 via the communication satellite 300.
- the helicopter-mounted communication device 220 includes an external interface 221, a control unit 222, a transmission unit 223, a reception unit 224, and a storage unit 225.
- the external interface 221 includes an external device connection interface such as a LAN (Local Area Network) device or a USB (Universal Serial Bus) device.
- the external interface 221 communicates with the information terminal 210 via a communication cable, radio, or the like.
- the control unit 222 includes a processing device such as a processor.
- the control unit 222 operates according to a program stored in a ROM (Read Only Memory) or a RAM (Random Access Memory) (not shown), and executes various operations including “information transmission processing” and “information reception processing” described later. .
- the control unit 222 operates according to the “information transmission process”, and functions as a data multiplexing unit 222a, an encoding unit 222b, a blocking period acquisition unit 222c, a packet interleaving unit 222d, and a modulation unit 222e as shown in FIG. To do.
- control unit 222 operates according to the “information reception process”, thereby functioning as a demodulation unit 222f, a packet deinterleave unit 222g, a decoding unit 222h, and a data separation unit 222i as shown in FIG. These functions will be described later in the description of “information transmission process” and “information reception process”.
- the transmission unit 223 includes a frequency converter, an amplifier, and the like.
- the transmission unit 223 converts the electrical signal output from the control unit 222 into an electrical signal in the frequency band for satellite communication, and amplifies the converted electrical signal and outputs the amplified electrical signal to the antenna 230.
- the receiving unit 224 includes an amplifier, a frequency converter, and the like.
- the receiving unit 224 amplifies the electrical signal output from the antenna 230, converts the amplified electrical signal into an electrical signal in a frequency band requested by the control unit 222, and outputs the electrical signal to the control unit 222.
- the storage unit 225 includes a storage device capable of reading and writing data such as a DRAM (Dynamic Random Access Memory), an SRAM (Static Random Access Memory), a flash memory, and a hard disk. As shown in FIG. 7, the storage unit 225 stores data such as “blocking period information”.
- “Blocking period information” is information storing the timing at which communication is blocked by the rotor blades of the helicopter 200.
- the cutoff period information includes a “shutdown period” (for example, period (a) shown in FIG. 6) in which communication is blocked by the rotor blades and a “communication available period” (for example, in FIG. 6). (Period (b) shown) is stored.
- the antenna 230 includes a satellite communication antenna for a mobile body (for example, a parabolic antenna having a satellite tracking function) that transmits radio waves to and receives radio waves from the satellites.
- the antenna 230 converts the electrical signal output from the transmission unit 223 into a radio wave and transmits it to the communication satellite 300. Further, the antenna 230 converts the radio wave received from the communication satellite 300 into an electric signal and outputs it to the receiving unit 224.
- the operation of the helicopter satellite communication system 1 includes processing for transmitting information from the ground station 100 to the helicopter 200 (hereinafter referred to as “ground station transmission processing”), and transmitting information from the helicopter 200 to the ground station 100.
- ground station transmission processing There are two types of processing (hereinafter referred to as “helicopter transmission processing”). First, the ground station transmission process will be described.
- the control unit 122 of the ground station communication device 120 Upon receiving information from the information terminal 110 via the external interface 121 (hereinafter referred to as “transmission target information”), the control unit 122 of the ground station communication device 120 transmits the received transmission target information to the helicopter 200 “Information” "Transmission process” is started. In addition, when power is turned on, the control unit 222 of the helicopter-mounted communication device 220 starts “information reception processing” that receives transmission target information from the ground station 100 and outputs it to the information terminal 210.
- the “information transmission process / information reception process” will be described below with reference to the flowchart of FIG.
- the data multiplexing unit 122a When receiving data to be transmitted such as video and audio from the information terminal 110 via the external interface 121, the data multiplexing unit 122a multiplexes the plurality of data strings into one data string as shown in FIG. Processing is executed (step S101). Note that the data multiplexing unit 122a may compress the data to reduce the amount of data before multiplexing the data or after multiplexing the data in order to effectively use the bandwidth.
- the encoding unit 122b divides the multiplexed transmission target information into blocks of a predetermined length as shown in FIG. 10A, and blocks the divided transmission target information as shown in FIG. 10B. Encoding is performed in units (step S102).
- “encoding” refers to converting data into data of another format based on a predetermined error correction encoding method, for example, attaching an error correction code to data.
- the error correction coding method is not limited to a specific method, but for example, a block code such as LDPC (Low Density Parity Check Code) or Reed-Solomon code can be used.
- the error correction coding method is preferably a coding method having high burst error correction capability and erasure correction capability such as a product code and a concatenated code in order to suppress data loss due to the rotor blade. Also, it is desirable that the encoding unit 122b adds 150% or more redundant bits to the multiplexed data in order to suppress data loss due to the rotor blades.
- an encoded block is referred to as an “error correction block” for easy understanding.
- the cutoff period acquisition unit 122c is based on the helicopter information stored in the storage unit 125, and the length of the cutoff period during which information is blocked by the rotor blades of the helicopter 200 that is the information transmission target ( Hereinafter, it is simply referred to as “blocking period”) (step S103).
- blocking period For example, it is assumed that helicopter information as shown in FIG. 5 is stored in the storage unit 125, and the model information of the helicopter 200 that will transmit information from now on is “model 1”.
- the blocking period acquisition unit 122c extracts the record 1 whose model information is “model 1” from the helicopter information, and determines the blocking period 10 ms stored in the record 1 as the corresponding blocking period. .
- the packet interleaving unit 122d divides the error correction block encoded by the encoding unit 122b into a plurality of packets as shown in FIG. 11A. Then, as shown in FIG. 11B, the packet interleaving unit 122d receives packets that are continuous immediately after the division (for example, packets (a) and (b) shown in FIG. 11B; hereinafter referred to as “continuous packets”). The order of the packets is rearranged so that the packet intervals equal to or longer than the blocking period determined by the blocking period acquisition unit 122c are arranged (step S104).
- the packet interleaving unit 122d stores in advance the packet transmission time required to transmit one packet, and based on the stored packet transmission time and the blocking period determined by the blocking period acquisition unit 122c. For example, as shown in FIG. 11B, the minimum number of packets (for example, 3 packets; hereinafter referred to as “minimum number of packets”) that is equal to or longer than the blocking period when packets are continuously transmitted is determined. Then, the packets are rearranged so that continuous packets are arranged for each determined minimum number of packets.
- minimum number of packets for example, 3 packets; hereinafter referred to as “minimum number of packets”
- the “packet interval” is a transmission interval between two packets transmitted on the same communication path, and is an interval from the start of transmission of the first transmitted packet to the start of transmission of the next transmitted packet. I mean. For example, if two packets are the packets (a) and (b) shown in FIG. 11B, the interval (c) shown in FIG. 11B is the packet interval.
- the packet interleaving unit 122d may rearrange the packets while interweaving packets of other error correction blocks so that the packets in the same error correction block do not continue. For example, the packet interleaving unit 122d inserts a packet belonging to the error correction block b or the error correction block c between packets belonging to the error correction block a, and rearranges the packets as shown in FIG. 11C, for example.
- the packet interleaving unit 122d sets a packet interval equal to or longer than the blocking period so that a plurality of packets belonging to the same error correction block do not disappear simultaneously when the communication path is blocked once.
- the packets may be rearranged so that they are opened and arranged.
- the packet interleaving unit 122d may rearrange packets so that packets in the same error correction block are arranged for each minimum number of packets. For example, as shown in FIG. 11B, the packet interleave unit 122d rearranges the packets so that packets belonging to the same error correction block are arranged for each minimum number of packets (for example, every 3 packets).
- the packet interleaving unit 122d prepares buffers capable of storing a packet for one error correction block for the minimum number of packets (for example, three), and the plurality of buffers as shown in FIG. 12A.
- the packets are stored in ascending order of memory numbers.
- the packet interleaving unit 122d outputs packets while changing the buffer in ascending order of buffer numbers.
- FIG. 12C the packets are rearranged so that the packets in the same error correction block are arranged for each minimum number of packets.
- the modulation unit 122e modulates the packets rearranged by the packet interleaving unit 122d by a predetermined modulation method and converts them into analog signals of a predetermined frequency (step S105).
- the modulation scheme is not limited to a specific modulation scheme.
- BPSK Binary Phase Shift Shift Keying
- QPSK Quadrature Phase Shift Shift Keying
- 8PSK 8 Phase Shift Shift Keying
- 16 APSK (16 Amplitude Phase Shift Shift Keying
- 32 APSK 32 Amplitude Phase Shift Keying
- the modulation unit 122e transmits the modulated packet (that is, an analog signal) to the transmission unit 123 (step S106).
- the transmission unit 123 converts the received analog signal into an electric signal in a frequency band for satellite communication, amplifies the converted electric signal, and outputs the amplified signal to the antenna 130.
- the antenna 130 transmits the signal output from the transmission unit 123 to the helicopter 200 via the communication satellite 300.
- step S107 determines whether the control unit 222 of the helicopter-mounted communication device 220 has received a signal from the reception unit 224 (step S107). When the signal is not received (step S107: No), the control unit 222 repeats step S107 until the signal is received. When the signal is received (step S107: Yes), the process proceeds to step S108.
- the demodulator 222f demodulates the received signal (that is, an analog signal) using a demodulation method corresponding to the modulation method in step S105 and converts it into a digital signal (step S108).
- the packet deinterleaving unit 222g rearranges the packets rearranged in step S104 in the original order. For example, it is assumed that the packet interleave unit 122d as the information transmission source rearranges the packets so that the packets in the same error correction block are arranged every three packets. At this time, the packet deinterleaving unit 222g prepares, for example, three buffers capable of storing one packet for each error correction block, and the buffer numbers are stored in these three buffers as shown in FIG. 13A. Packets are stored alternately in ascending order. Then, as shown in FIG. 13B, the packet interleaving unit 222g reads packets for each buffer in ascending order of memory numbers.
- the packet deinterleaving unit 222g acquires the error correction block generated in step S102 by combining the rearranged packets as shown in FIG. 14B (step S109).
- the decoding unit 222 h decodes the error correction block acquired in step S ⁇ b> 109 and restores the data lost by the rotor as shown in FIG. 15A.
- “decoding” refers to restoring data that has been lost / changed due to the influence of a rotor blade or the like by performing error correction on the encoded data.
- the decoding unit 222h synthesizes the restored data, and acquires the transmission target information multiplexed in step S101 (step S110).
- the data separation unit 222i separates “video”, “sound”, “control / monitoring information” and the like from the transmission target information acquired in step S110 as shown in FIG. It transmits to the information terminal 210 via 221 (step S111).
- the control unit 222 returns to step S107 and waits for receiving a signal from the ground station 100 again.
- the “information transmission process” transmits the received transmission target information to the ground station 100.
- the control unit 122 of the ground station communication device 120 starts an “information reception process” for transmitting information received from the helicopter 200 to the information terminal 110 when the device is turned on.
- the “information transmission process / information reception process” will be described below with reference to the flowchart of FIG.
- the data multiplexing unit 222a executes a multiplexing process for combining the plurality of data strings into one data string, similarly to step S101 (step S201).
- the encoding unit 222b divides the multiplexed transmission target information into blocks of a predetermined length, and encodes the divided transmission target information in units of blocks (step S202).
- the blocking period acquisition unit 222c determines the blocking period in which information is blocked by the rotor blades of the helicopter 200 based on the blocking period information stored in the storage unit 225 (step S203). For example, if the block period information as illustrated in FIG. 7 is stored in the storage unit 225, the block period acquisition unit 222c determines the block period 10 ms stored in the block period information as the corresponding block period. .
- the packet interleaving unit 222d divides the error correction block encoded by the encoding unit 222b into a plurality of packets in the same manner as in step S104. Further, the packet interleaving unit 222d rearranges the order of the packets so that the continuous packets are arranged with a packet interval equal to or longer than the blocking period determined by the blocking period acquisition unit 222c, as in step S104. Note that the packet interleaving unit 222d may rearrange the packets while interweaving the packets of other error correction blocks so that the packets in the same error correction block do not continue, as in step S104.
- the packet interleaving unit 222d may rearrange the packets in the same error correction block so that the packets in the same error correction block are arranged with a packet interval equal to or greater than the blocking period, and further, in the same error correction block. You may rearrange so that a packet may be arrange
- the modulation unit 222e modulates the packets rearranged by the packet interleaving unit 222d by a predetermined modulation method and converts the packets into analog signals having a predetermined frequency (step S205).
- the modulation unit 222e transmits the modulated packet (that is, an analog signal) to the transmission unit 223 (step S206).
- the transmission unit 223 converts the received analog signal into an electric signal in a frequency band for satellite communication, amplifies the converted electric signal, and outputs the amplified electric signal to the antenna 230.
- the antenna 230 transmits the signal output from the transmission unit 223 to the ground station 100 via the communication satellite 300.
- control unit 122 determines whether a signal is received from the receiving unit 124 (step S207). When the signal is not received (step S207: No), the control unit 122 repeats step S207 until the signal is received. When the signal is received (step S207: Yes), the process proceeds to step S208.
- the demodulator 122f demodulates the received signal using a demodulation method corresponding to the modulation method in step S205 and converts it into a digital signal (step S208).
- the packet deinterleaving unit 122g rearranges the packets rearranged in step S204 in the original order. Further, the packet deinterleaving unit 122g acquires the error correction block generated in step S202 by combining the rearranged packets (step S209).
- the decoding unit 122h decodes the error correction block acquired in step S209 and restores data lost due to the influence of the rotor blades or the like. Furthermore, the decoding unit 122h synthesizes the restored data and acquires transmission target information (step S210).
- the data separation unit 122i separates information such as video and audio from the transmission target information acquired in step S210 and transmits the information to the information terminal 110 via the external interface 121 (step S211).
- the control unit 122 returns to step S207 and waits for receiving a signal from the helicopter 200 again.
- the packets are rearranged so that the continuous packets are not continuous. Therefore, even if data is continuously lost by the rotor blades of the helicopter, for example, as shown in FIG.
- the positions of lost packets are distributed by rearranging.
- burst errors that have been a major cause of error correction failures are suppressed, and as a result, the success rate of error correction can be increased.
- the data can be restored without transmitting the same data multiple times at different times, and as a result, the bandwidth can be used efficiently.
- the packet interval of continuous packets is configured to be longer than the blocking period, the continuous loss of packets due to one blocking of the communication path is reduced. As a result, the burst length of the burst error can be further shortened, and as a result, error correction can be performed more reliably.
- the error correction block exceeds the correction capability as shown in FIG. 18B, for example.
- the concentration of lost packets in one error correction block is suppressed.
- the data loss rate per error correction block can be reduced, and as a result, error correction can be performed more reliably.
- the packet interval of packets belonging to the same error correction block is configured to be longer than the cutoff period, it is possible to suppress a plurality of packets of the same error correction block from being lost simultaneously by blocking the communication path once. As a result, the data loss rate per error correction block can be further reduced, and as a result, error correction can be performed more reliably.
- the interruption period is determined for each helicopter, the information output delay of other helicopters does not become unnecessarily large in combination with the helicopter having a large rotor blade width and a large interruption period.
- a helicopter satellite communication system a system in which a ground station and a helicopter communicate via a communication satellite is shown.
- a ground station and a helicopter communicate with each other. It is not limited to the system.
- the helicopter satellite communication system may be a device in which a helicopter and a helicopter communicate, or may be a system in which a helicopter and an aircraft communicate.
- a communication device similar to the helicopter-mounted communication device 220 or the ground station communication device 120 may be mounted on the helicopter or the aircraft.
- the satellite used in the helicopter satellite communication system 1 is not limited to the communication satellite, and may be another satellite that orbits the earth such as a broadcasting satellite or a space station.
- the information on the interruption period acquired by the interruption period acquisition unit 122c and the interruption period acquisition unit 222c does not necessarily need to be stored in advance in the helicopter information and the interruption period information.
- helicopter position information for example, information on the latitude, longitude, altitude, etc.
- attitude information for example, information on the roll axis, pitch axis, azimuth axis, etc.
- satellite orbit position information etc.
- the positional relationship among the satellite, the antenna, and the rotor blade may be determined, and the cutoff period may be calculated sequentially based on the determined result.
- the error correction coding method used by the coding unit 122b and the coding unit 222b is not limited to LDPC or Reed-Solomon code.
- the error correction coding method may be another block code such as a BCH code or a fire code, or may be a convolutional code such as a turbo code.
- the encoding system which combined the block code and the convolutional code may be sufficient.
- the same communication method is used for the ground station transmission process and the helicopter transmission process.
- different communication methods may be used for the ground station transmission process and the helicopter transmission process.
- the ground station transmission process may use the method shown in FIG. 8, and the helicopter transmission process may use the method disclosed in Patent Document 1.
- Each function of the control unit 122 and the control unit 222 (data multiplexing unit, encoding unit, blocking period acquisition unit, packet interleave unit, modulation unit, demodulation unit, packet deinterleave unit, decoding unit, data separation unit) Is not necessarily realized by one processor.
- these functions may be realized by using a plurality of processors and circuits, or only some functions may be realized by using a processor or circuit different from other functions.
- each function may be realized by using independent processors and circuits.
- the helicopter satellite communication system 1, the ground station communication device 120, and the helicopter-mounted communication device 220 of the present embodiment may be realized by a dedicated system or may be realized by a normal computer system.
- the helicopter satellite communication system 1 and the ground station are stored by distributing a program for executing the above-described operation in a computer-readable recording medium, installing the program in a computer, and executing the above-described processing
- the communication device 120 and the helicopter-mounted communication device 220 may be configured. Further, it may be stored in a disk device provided in a server device on a network such as the Internet so that it can be downloaded to a computer, for example.
- the above-described function may be realized by joint operation of the OS and application software. In this case, only the part other than the OS may be stored and distributed in a medium, or may be downloaded to a computer.
- Recording media for recording the above programs include USB memory, flexible disk, CD, DVD, Blu-ray (registered trademark), MO, SD card, Memory Stick (registered trademark), magnetic disk, optical disk, magneto-optical disk, Computer-readable recording media such as semiconductor memory and magnetic tape can be used.
- 1 helicopter satellite communication system 100 ground station, 110, 210 information terminal, 120 ground station communication device, 121, 221 external interface, 122, 222 control unit, 122a, 222a data multiplexing unit, 122b, 222b encoding unit, 122c , 222c blocking period acquisition unit, 122d, 222d packet interleaving unit, 122e, 222e modulation unit, 122f, 222f demodulation unit, 122g, 222g packet deinterleaving unit, 122h, 222h decoding unit, 122i, 222i data separation unit, 123, 223 Transmitter, 124, 224, receiver, 125, 225, storage, 130, 230 antenna, 200 helicopter, 220 helicopter-equipped communication device, 300 communication satellite.
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Abstract
Description
Claims (11)
- ヘリコプターに搭載される第1の通信装置と、前記第1の通信装置と衛星を介して通信する第2の通信装置と、を備えるヘリコプター衛星通信システムであって、
前記第1の通信装置と前記第2の通信装置の一方の通信装置は、
送信対象情報を所定の誤り訂正符号化方式により符号化する符号化手段と、
符号化された前記送信対象情報を複数のパケットに分割し、分割直後のパケット順で連続するパケットが連続して配置されないように、パケットの順序を並び替えるパケットインターリーブ手段と、
前記パケットインターリーブ手段で並び替えられたパケットを前記衛星を介して他方の通信装置に送信する送信手段と、を備え、
前記他方の通信装置は、
前記一方の通信装置から送信されたパケットを前記衛星を介して受信する受信手段と、
受信したパケットを基の順序に並び替えるパケットデインターリーブ手段と、
前記パケットデインターリーブ手段で並び替えられたパケットから取得した前記送信対象情報を復号することによって、前記ヘリコプターの回転翼によって消失した情報を復元する復号手段と、を備える、
ヘリコプター衛星通信システム。 - 前記一方の通信装置は、前記ヘリコプターの回転翼によって通信路が遮断される遮断期間の長さを取得する遮断期間取得手段、を備え、
前記パケットインターリーブ手段は、分割直後のパケット順で連続するパケットが前記遮断期間の長さ以上のパケット間隔を開けて並ぶように、パケットの順序を並び替える、
請求項1に記載のヘリコプター衛星通信システム。 - 前記符号化手段は、前記送信対象情報をブロック単位で符号化し、
前記パケットインターリーブ手段は、
符号化したブロックを複数のパケットに分割し、
分割したパケットを同じブロック内のパケットが連続して配置されないように他のブロックのパケットを織り交ぜながら並び替える、
請求項2に記載のヘリコプター衛星通信システム。 - 前記パケットインターリーブ手段は、同じブロックに属するパケットが前記遮断期間の長さ以上のパケット間隔を開けて並ぶようにパケットの順序を並び替える、
請求項3に記載のヘリコプター衛星通信システム。 - 前記パケットインターリーブ手段は、連続してパケットを送信したときに前記遮断期間の長さ以上となる最小のパケット数を判別し、判別した最小のパケット数毎に同じブロックに属するパケットが配置されるようにパケットを並び替える、
請求項4に記載のヘリコプター衛星通信システム。 - 前記第2の通信装置は、前記ヘリコプターの機種情報と、その機種情報によって示されるヘリコプターの回転翼によって遮断される遮断期間の長さと、を関連付けたヘリコプター情報を記憶する記憶手段、を備え、
前記第2の通信装置が備える遮断期間判別手段は、前記第1の通信装置が搭載されているヘリコプターの機種情報と前記ヘリコプター情報とを基に、ヘリコプター毎に前記遮断期間の長さを判別する、
請求項5に記載のヘリコプター衛星通信システム。 - ヘリコプターに搭載される第1の通信装置と前記第1の通信装置と衛星を介して通信する第2の通信装置のうちの一方の通信装置であって、
送信対象情報を所定の誤り訂正符号化方式により符号化する符号化手段と、
符号化された前記送信対象情報を複数のパケットに分割し、分割直後のパケット順で連続するパケットが連続して配置されないように、パケットの順序を並び替えるパケットインターリーブ手段と、
前記パケットインターリーブ手段で並び替えられたパケットを前記衛星を介して他方の通信装置に送信する送信手段と、を備える、
通信装置。 - ヘリコプターに搭載される第1の通信装置と前記第1の通信装置と衛星を介して通信する第2の通信装置のうちの一方の通信装置であって、
他方の通信装置から送信されたパケットを前記衛星を介して受信する受信手段と、
前記他方の通信装置によって並び替えられたパケットを基の順序に並び替えるパケットデインターリーブ手段と、
前記パケットデインターリーブ手段で並び替えられたパケットから取得した送信対象情報を復号することによって、前記ヘリコプターの回転翼によって消失した情報を復元する復号手段と、を備える、
通信装置。 - ヘリコプターに搭載される第1の通信装置と前記第1の通信装置と衛星を介して通信する第2の通信装置のうちの一方の通信装置と、他方の通信装置と、の間の通信方法であって、
送信対象情報を所定の誤り訂正符号化方式により符号化する符号化ステップと、
符号化された前記送信対象情報を複数のパケットに分割し、分割直後のパケット順で連続するパケットが連続して配置されないように、パケットの順序を並び替えるパケットインターリーブステップと、
前記パケットインターリーブステップで並び替えられたパケットを前記衛星を介して前記他方の通信装置に送信する送信ステップと、
前記一方の通信装置から送信されたパケットを前記衛星を介して受信する受信ステップと、
受信したパケットを基の順序に並び替えるパケットデインターリーブステップと、
前記パケットデインターリーブステップで並び替えられたパケットから取得した前記送信対象情報を復号することによって、前記ヘリコプターの回転翼によって消失した情報を復元する復号ステップと、を有する、
通信方法。 - ヘリコプターに搭載される第1の通信装置と前記第1の通信装置と衛星を介して通信する第2の通信装置のうちの一方の通信装置を制御するコンピュータに、
送信対象情報を所定の誤り訂正符号化方式により符号化する符号化機能と、
符号化された送信対象情報を複数のパケットに分割し、分割直後のパケット順で連続するパケットが連続して配置されないように、パケットの順序を並び替えるパケットインターリーブ機能と、
前記パケットインターリーブ機能によって並び替えられたパケットを前記衛星を介して他方の通信装置に送信する送信機能と、を実現させる、
通信プログラム。 - ヘリコプターに搭載される第1の通信装置と前記第1の通信装置と衛星を介して通信する第2の通信装置のうちの一方の通信装置を制御するコンピュータに、
他方の通信装置から送信されたパケットを前記衛星を介して受信する受信機能と、
他方の通信装置によって並び替えられたパケットを基の順序に並び替えるパケットデインターリーブ機能と、
前記パケットデインターリーブ機能によって並び替えられたパケットから取得した送信対象情報を復号することによって、ヘリコプターの回転翼によって消失した情報を復元する復号機能と、を実現させる、
通信プログラム。
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US14/388,033 US20150117303A1 (en) | 2012-03-29 | 2013-03-18 | Helicopter satellite communication system, communication apparatus, communication method, and non-transitory computer-readable recording medium storing communication program |
EP13768386.8A EP2846476A4 (en) | 2012-03-29 | 2013-03-18 | HELICOPTER SATELLITE COMMUNICATION SYSTEM, COMMUNICATION APPARATUS, COMMUNICATION METHOD, AND COMMUNICATION PROGRAM |
KR1020147026689A KR101564215B1 (ko) | 2012-03-29 | 2013-03-18 | 헬리콥터 위성 통신 시스템, 통신장치, 통신방법, 및 통신 프로그램을 기록한 컴퓨터 판독가능한 기록매체 |
CN201380017977.8A CN104247297A (zh) | 2012-03-29 | 2013-03-18 | 直升机卫星通信系统、通信装置、通信方法、以及通信程序 |
IL234785A IL234785A0 (en) | 2012-03-29 | 2014-09-22 | Satellite communication system for the helicopter, communication devices, and communication software, and software for reading on a computer that does not pass for recording communication for storage |
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JP2012077557A JP5800745B2 (ja) | 2012-03-29 | 2012-03-29 | ヘリコプター衛星通信システム、通信装置、通信方法、及び通信プログラム |
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SE545756C2 (en) | 2021-12-17 | 2024-01-02 | Ovzon Sweden Ab | Satellite Communication System, Transceiver Terminal, Main Transceiver, Methods, Computer Programs and Non-Volatile Data Carriers |
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KR20140129269A (ko) | 2014-11-06 |
CN104247297A (zh) | 2014-12-24 |
TW201401803A (zh) | 2014-01-01 |
EP2846476A4 (en) | 2016-03-02 |
JP2013207734A (ja) | 2013-10-07 |
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TWI479832B (zh) | 2015-04-01 |
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