JP4326530B2 - Mobile communication device and mobile communication system - Google Patents

Description

  The present invention relates to wireless communication between moving objects and wireless communication between a moving object and a fixed station, and more particularly to wireless communication for a flight formation composed of an aircraft.

Conventionally, as a wireless communication method for a flight formation, for example, a combination of a TDMA method and a CDMA method has been proposed (for example, Patent Document 1).
In such a conventional wireless communication system, for example, time slot information used in the TDMA system and code information used in the CDMA system are flighted to each mobile communication device mounted on each aircraft that performs formation flight. During the flight, using these time slot information and code information, the communication between each mobile communication device or between the mobile communication device and the ground station provided on the ground can be performed. Realized.
JP 2005-1920203 A

However, in the above-described conventional communication system, before the flight, it is considered in which formation each mobile body belongs to fly, and according to the result of the examination, a time slot or Since it was necessary to set the code, there was a problem that the human burden before the flight was large.
Also, since it was virtually impossible to change the preset time slots and signs during the flight, the communication conditions during the flight could not be changed and the flight formation could not be reorganized. There was a problem that the pilot workload increased and normal operation was impossible due to the heavy load.

  The present invention has been made to solve the above-described problem, and a mobile communication device and a mobile device that can reorganize a formation after departure by freely switching communication conditions of each mobile communication device after departure. An object is to provide a communication system.

In order to solve the above problems, the present invention employs the following means.
The present invention is mounted on each of the mobile bodies belonging to a formation comprising at least one mobile body, and performs time division multiplexing using individual time slots assigned to each of the mobile bodies in the formation. In a mobile communication apparatus comprising: control means; and code division control means for performing code division multiplexing on a signal time-division multiplexed by the time division control means using different codes assigned to each of the formations, A code for switching the code used by the code division control means to a code corresponding to the change-destination formation based on the formation change information after the departure, the formation information receiving means for receiving the change information of the formation from the command station Based on the switching means and the change information of the formation, the time slot used by the time division control means is changed to a time slot corresponding to the change destination formation. To provide a mobile communication apparatus comprising a time slot switching means for changing Ri.

According to the above configuration, time division multiplexing is performed by assigning different time slots to each mobile unit in the formation, and code division is used by assigning different codes to each of the different formations. Multiplexing is combined and communication is performed between mobile communication devices mounted on each mobile body in the formation, so that interference between the formations can be avoided and stable communication with high confidentiality can be realized.
In this case, after the departure, when the formation information receiving means receives the change information of the formation from the command station, the code switching means automatically changes the code used by the code division control means to the code corresponding to the changed formation. The time slot switching means switches the time slot used by the time division control means to the one corresponding to the changed formation, so that the formation to which it belonged without giving a sense of incongruity to the operator of the moving object. It is possible to automatically change the communication condition in to the communication condition corresponding to the changed formation.

  In the above mobile communication device, the mobile body does not belong to any formation at the time of departure, and the formation information receiving means receives new participation information of the future belonging from the command station after the departure. The code switching means sets a code corresponding to the flight belonging to the code to be used by the code division control means based on the new subscription information of the flight, and the time slot switching means It is preferable to set the time slot used by the time division control means based on the new subscription information.

  According to the above configuration, after departure, new subscription information of a formation to which the mobile body will belong is received, and a code and a time slot are set based on the new subscription information. Thereby, even if the mobile body does not belong to any formation at the time of departure, it becomes possible to join the mobile body to the formation after the departure. As a result, a setting operation or the like related to the formation to each mobile communication device before departure becomes unnecessary, so that the human burden can be reduced.

  In the above mobile communication device, the formation information receiving means receives information from the command station by switching the code used by the code division control means to a dedicated code for receiving information from the command station. Furthermore, it is preferable that the dedicated code is set to be the same in all the mobile bodies managed by the same command station.

According to the above configuration, the formation information receiving means obtains information from the command station only by performing an operation of switching the code used by the code division control means to a dedicated code for receiving information from the command station. Therefore, the reception of information from the command station can be realized by a very easy process. Furthermore, since no other configuration for reception is required, the configuration can be simplified.
In addition, since the same dedicated code is used for all mobiles managed by the same command station, all commands sent from the command station, that is, all new information on formations and information on changes in formations, are used. Can be shared by any mobile unit. Thereby, the operator of each moving body can grasp the change of the formation of other moving bodies. Further, since the command station can instruct new subscription information and change information of a formation to each mobile communication device by a broadcast method, it is possible to efficiently notify such information.

  The present invention includes a plurality of mobile communication devices mounted on each of a plurality of mobile bodies, and a fixed communication device for notifying the mobile communication device of information from a command station that determines formation formation of the mobile bodies. In the mobile communication system, the mobile communication device includes time division control means for performing time division multiplexing using individual time slots assigned to each of the mobile bodies belonging to the same formation, and each of the formations. Code division control means for performing code division multiplexing on the signals time-division multiplexed by the time division control means using different assigned codes, and receiving the change information of the formation after departure from the command station A formation information receiving means, a code switching means for switching a code used by the code division control means to a code corresponding to a change destination formation based on the change information of the formation, and the edition Based on the change information, to provide a mobile communication system and a timeslot switching means for switching the time-division control means time slot corresponding to the destination of the flight time slots used by the.

According to the above configuration, the mobile communication system includes a plurality of mobile communication devices mounted on each of the plurality of mobile bodies, and a fixed communication device provided in a command station for instructing a formation related to each of the mobile bodies. Yes. The mobile communication device performs time division multiplexing using different time slots in the formation, and further uses code division using different codes assigned to each of the formation, and performs time division multiplexing and code division multiplexing. In combination, the mobile communication devices mounted on the mobile bodies in the formation communicate with each other, so that interference between the formations can be avoided and stable communication with high confidentiality can be realized.
In addition, after the departure, when the formation information receiving means receives the formation change information from the command station, the mobile communication device changes the code used by the code division control means to the code corresponding to the change destination formation. It automatically switches and the time slot switching means switches the time slot used by the time division control means to the one corresponding to the changed formation, so it has belonged until now without giving a sense of incongruity to the operator of the moving object It becomes possible to automatically change the communication condition in the formation to the communication condition corresponding to the changed formation.

  In the above mobile communication system, each of the mobile bodies does not belong to any formation at the time of departure, and the formation information receiving means transmits the new subscription information of the future belonging to the fixed communication after the departure. Received from the apparatus, the code switching means sets a code corresponding to the flight belonging to the code to be used by the code division control means based on the new subscription information of the flight, and the time slot switching means Preferably, the time slot used by the time division control means is set based on the new subscription information of the formation.

  According to such a configuration, on the mobile communication device side, after departure, the new subscription information of the formation to which the mobile body will belong will be received, and the code and the time slot are set based on the new subscription information. . Thereby, even if the mobile body does not belong to any formation at the time of departure, it becomes possible to join the mobile body to the formation after the departure. As a result, a setting operation or the like related to the formation to each mobile communication device before departure becomes unnecessary, so that the human burden can be reduced.

  In the above mobile communication system, each of the formation information receiving means included in all the mobiles managed by the same command station is configured so that the code used by the code division control means is synchronized with each other. It is preferable that information from the command station is received by switching to the same dedicated code for receiving information from the terminal.

  According to such a configuration, since the same dedicated code is used for all the mobiles managed by the same command station, the command transmitted from the command station, that is, the new joining information of the formation or It is possible for all mobiles to share the change information of the formation. Thereby, the operator of each moving body can grasp the change of the formation of other moving bodies. Furthermore, since the command station can instruct new subscription information and change information of a formation in a broadcast manner to each mobile communication device, the information can be notified efficiently.

  According to the present invention, it is possible to freely switch the communication conditions of each mobile communication device after the departure, so that the formation can be freely reorganized after the departure.

Hereinafter, an embodiment in which a mobile communication system according to the present invention is applied to a flight formation communication system (hereinafter simply referred to as “communication system”) relating to an aircraft flight formation will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a communication system according to the first embodiment of the present invention. In FIG. 1, the communication system includes a fixed communication device 10 and a mobile communication device 20. The fixed communication device 10 is installed in each of a plurality of communication stations provided on the ground. The mobile communication device 20 is mounted on each aircraft 30 that performs formation flight. The formation of the aircraft flight formation 40 is determined by a ground command station (not shown). The command station gives instructions to the formation of a flight formation or reorganization to each aircraft 30 via the fixed communication device 10 installed in the communication station. The command station may be in an aircraft, and in that case, the aircraft 30 is instructed to form or reorganize a flight formation via the mobile communication device 20. Details will be described later.

  The mobile communication device 20 has a configuration capable of communicating with the mobile communication devices 20 belonging to the same formation and with the fixed communication device 10. The mobile communication device 20 adopts a small zone method, and the diameter of the small zone 50 is limited to a distance that can cover the relative distance during the flight action between all the aircrafts 30 of the same flight formation 40. Therefore, the output of the mobile communication device 20 mounted on the aircraft 30 is a small output. Moreover, since the relative position of the aircraft 30 changes depending on the flight behavior, an omnidirectional antenna is used. Thus, the aircrafts 30 of the same flight formation 40 can always communicate with each other during the flight action.

As a radio signal multiplexing system, a system combining a TDMA system and a CDMA system is employed.
A TDMA system is adopted as a multiplexing system in each small zone 50. Individual time slots are assigned to the mobile communication devices 20 of the aircrafts 30 in the flight formation 40 by performing settings at the time of new subscription, which will be described later. Each mobile communication device 20 performs communication using a time slot assigned to itself.

  Each flight is assigned a different spreading code. Each mobile communication device 20 further performs spread spectrum (DS-SS) using a code assigned to the flight formation 40 to which the mobile communication device 20 belongs, and transmits the TDMA signal. Thereby, while being able to avoid interference with the other formation 40, highly confidential communication can be realized. Note that the code assignment in the mobile communication device 20 is automatically performed by a setting process or the like at the time of new subscription described later.

The fixed communication device 10 can communicate with each mobile communication device 20 in each small zone 50. An instruction from the command station is sent from the fixed communication device 10 at the communication station to the mobile communication device 20 of each aircraft 30. Since the output of the mobile communication device 20 is suppressed to such an extent that it can communicate non-directionally in the flight formation 40, the fixed communication device 10 uses a directional antenna that exhibits high gain directivity characteristics in a narrow range, and its directivity By controlling the sex in the direction of the flight formation 40, it communicates with the mobile communication device 20 of each aircraft 30.
Furthermore, the above-described fixed communication device 10 and all the mobile communication devices 20 have a broadcast code (hereinafter referred to as “BC code”). Each fixed communication device 10 and mobile communication device 20 can simultaneously communicate using a BC code, thereby realizing information exchange using a broadcast method.

FIG. 2 is a block diagram illustrating a configuration of the mobile communication device 20. Referring to FIG. 2, the mobile communication device 20 includes a transmission / reception unit 21, an SSDS (spread spectrum-direct spread) control unit (code division control unit) 22, a TDMA control unit (time division control unit) 23, a coupler 24, and an airframe interface. 25, and a fuselage antenna terminal 26.
The transmission / reception unit 21 includes a reception unit 211 and a transmission unit 212. The SSDS control unit 22 includes an SSDS demodulation unit 221, an SSDS modulation unit 222, a code storage unit 223, and a code switching unit (code switching unit) 224. Airframe antenna terminal 26 is connected to airframe antenna 27. The TDMA control unit 23 includes a time slot switching unit (time slot switching unit) 231.

The receiving unit 211 sends the radio signal received by the airframe antenna 27 to the SSDS demodulating unit 221. At that time, the reception unit 211 performs amplification by LNA (low noise amplifier), frequency conversion from radio frequency to baseband, filtering, and the like.
The SSDS demodulation unit 221 performs an SSDS demodulation process on the signal from the reception unit 211 and sends the signal to the TDMA control unit 23. The SSDS demodulation process includes, for example, despreading, carrier reproduction, data demodulation, and the like. In this despreading process, a code set by a code switching unit 224 described later is used.
The SSDS modulation unit 222 performs an SSDS modulation process on the signal from the TDMA control unit 23 and sends the signal to the transmission unit 212. The SSDS modulation process includes, for example, data modulation and spreading. Similar to the SSDS modulation unit 222, the code set by the code switching unit 224 is used for this spreading process.

  The code storage unit 223 stores code information assigned to all flight formations 40 managed by the same command station and the above-described BC code. The code switching unit 224 uses the code used in the demodulation process in the SSDS demodulation unit 221 and the modulation process in the SSDS modulation unit 222 based on the new addition information or formation change information sent from the command station described later. Switch the sign used in. Details of the control of the code switching unit 224 will be described later.

The transmission unit 212 converts the spread signal from the SSDS modulation processing unit 222 into a radio signal and transmits it from the body antenna 28.
The TDMA control unit 23 extracts a signal in a predetermined time slot of the signal from the SSDS demodulation unit 221 (message depacking) and sends it to the machine interface 25. This time slot is a time slot set by a time slot switching unit 231 described later. Further, the TDMA control unit 23 inserts a signal from the machine interface 25 into a predetermined time slot (message packing), and sends it to the SSDS demodulation unit 22.

The time slot switching unit 231 sets a time slot to be used by the TDMA control unit 23 based on the new formation information or the change information of the formation sent from the command station described later. The time slot set here is a unique time slot assigned individually to the aircrafts 30 belonging to the same flight formation 40.
Further, the TDMA control unit 23 performs TDMA synchronization management at a timing common to all the mobile communication devices 20 of the aircraft 30.

  Airframe interface 25 is connected to each device (not shown) installed in the airframe, and transmits / receives device signals specific to each device. For example, an audio signal is transmitted and received if the device is used for audio communication. If it is various sensor apparatuses, the sensor signal which shows the state of each part will be transmitted / received. Physical and electrical interfaces are defined between each device.

FIG. 3 is a block diagram illustrating a configuration of the fixed communication device 10. Referring to FIG. 3, the fixed communication device 10 includes a TDMA control unit 31, an SSDS control unit 32, a transmission / reception unit 33, a coupler 34, a directional antenna 35, and a directivity control unit 36.
The directional antenna 35 is a directional antenna capable of controlling the directional direction. In order to communicate with the mobile communication device 20 that communicates between the aircrafts 30 belonging to the flight formation 40 within the small zone 50 and the fixed communication device 10 outside the small zone 50, the fixed communication device 10 has a high gain in the pointing direction. A directional antenna 35 is used. The directional antenna 35 may be, for example, an adaptive array antenna.

The directivity control unit 36 adaptively controls the directivity direction of the directional antenna 35 to the direction of the flight formation 40 that is a communication partner. The direction of the flight formation 40 may be given to the directing control unit 36 from, for example, a radar (not shown).
The receiving unit 331 sends the radio signal received by the directional antenna 35 to the SSDS demodulating unit 321. At that time, the receiving unit 331 performs amplification by LNA, frequency conversion from radio frequency to baseband, filtering, and the like.

The SSDS demodulator 321 performs an SSDS demodulation process on the spread signal from the receiver 331 and sends it to the TDMA controller 31. The SSDS demodulation process includes, for example, despreading, carrier reproduction, data demodulation, and the like. For the despreading process, a code set by a code switching unit 324 described later is used.
The SSDS modulation unit 322 performs an SSDS modulation process on the signal from the TDMA control unit 31 and sends the signal to the transmission unit 332. The SSDS modulation process includes, for example, data modulation and spreading. In this spreading process, a code assigned to the flight formation 40 of the communication partner is used.

The code storage unit 323 stores information on unique codes and BC codes assigned to all formations 40 managed by the same command unit.
The code switching unit 324 switches the code used by the SSDS demodulation unit 321 according to the aircraft 30 that is the transmission source of the signal, and also changes the code used by the SSDS modulation unit 322 according to the partner that transmits the command from the command unit. Switch. Thereby, when the BC code is set, the information can be transmitted to the mobile communication devices 20 mounted on all the aircrafts 30 at the same time, and the code corresponding to each communication partner is set. Therefore, highly confidential communication can be realized.

The transmission unit 332 transmits the signal from the SSDS modulation processing unit 322 from the directional antenna 35.
The TDMA control unit 31 takes out a signal of a predetermined time slot from the SSDS demodulation unit 321 and outputs it to the command station. This time slot may be a time slot unique to the flight formation 30 assigned to the mobile communication device 20 of the communication partner, or a multicast time received by the mobile communication devices 20 of all the aircrafts 30. It may be a slot.
In addition, the TDMA control unit 31 inserts a signal input from the command station into a predetermined time slot (message packing) and sends the signal to the SSDS modulation unit 322. This time slot may also be a time slot unique to the flight formation 30 assigned to the mobile communication device 20 of the communication partner, or may be a multicast time slot.

  The TDMA control unit 31 performs TDMA synchronization management at the same timing as the mobile communication devices 20 of all the aircrafts 30.

  Next, the operation of the mobile communication system having the above-described configuration will be described with reference to FIGS. For convenience of explanation, as shown in FIG. 4, here, eight aircrafts 30 are managed by the same command station (not shown), and after takeoff, these aircraft 30 have two formations 40A, The case where it is knitted to 40B will be described as an example.

  First, as shown in FIG. 4, aircraft numbers F <b> 1 to F <b> 8 for identifying each aircraft 30 are assigned in advance to each aircraft 30. Since the aircraft numbers F1 to F8 are unique numbers, the command station can identify each aircraft. Further, the aircraft 30 does not have information regarding formation flight at the time of takeoff. Accordingly, immediately after takeoff, the aircrafts 30 do not perform formation flight, but perform flight in a range that avoids contact with each other.

After takeoff, each mobile communication device 20 and fixed communication device 10 transmits and receives information according to the time table shown in FIG. First, during the period from time t0 to t1 in FIG. 5, information relating to formation or reorganization of a formation is exchanged according to the following procedure.
First, the code switching unit 224 (see FIG. 2) included in each mobile communication device 20 mounted on each aircraft 30 switches the code used for decoding of the SSDS demodulation unit 221 to the BC code. In synchronization with this, the code switching unit 324 (see FIG. 3) of the fixed communication apparatus 10 switches the code used for the modulation of the SSDS modulation unit 322 to the BC code.
Accordingly, the mobile communication devices 20 can share information notified from the command station and broadcast via the fixed communication device 10.

  In this reception state, the command station notifies each aircraft 30 of new subscription information of the flight to which it belongs. The new subscription information includes, for example, at least the identification number of the formation that each aircraft 30 will belong to and the time slot allocation information used when the aircraft 30 belongs to the formation. When each mobile communication device 20 receives the new subscription information of the formation, the code switching unit 224 (see FIG. 2) in the device assigns a code corresponding to the future flight to the code storage unit 223 based on the new subscription information. And keep this sign. Note that the retained code is used when communication is performed by combining the TDMA method and the CDMA method performed in the period from time t2 to time t6 in FIG.

  Similarly, the time slot switching unit 231 holds the time slot assigned to itself. The held time slot is used when communication is performed by combining the TDMA method and the CDMA method performed during the period from time t2 to time t6 in FIG.

Furthermore, when the mobile communication device 20 completes the acquisition of the codes and time slots relating to the flight to which the mobile communication device 20 will belong, the mobile communication device 20 displays the display installed in front of the pilot seat in the aircraft via the airframe interface 25 (see FIG. 2). The device displays information on the flight to which the aircraft will belong. As a result, the pilot confirms the formation information displayed on the display device, and performs the flight by performing the operation.
After the formation of the formation is once performed, the period from time t0 to t1 shown in FIG. 5 is used as a period for sending and receiving information related to the formation reorganization.

When the formations of the formations 40A and 40B are performed as described above, each mobile communication device 20 then belongs to the other mobile communication devices 20 during the period from time t1 to time t2 in FIG. Notify each flight information. This notification is performed by the broadcast method, similar to the above-described times t0 to t1.
Here, when the formation of the formation is performed at the above-described times t0 to t1, the codes used for modulation and demodulation differ between the mobile communication devices 20 belonging to different formations, so that information cannot be exchanged. For this reason, all the mobile communication apparatuses 20 notify the information of the formation to which the mobile communication device 20 belongs by the broadcast method, so that all the aircraft 30 (airframe numbers F1 to F8) shown in FIG. Can be grasped.

  Next, in the period from time t2 to t6 in FIG. 5, communication between the mobile communication devices 20 belonging to the same formation is not performed by the communication method combining the TDMA method and the CDMA method, instead of the communication by the broadcast method described above. Information necessary for flight is exchanged between each mobile communication device 20 and the command station.

  Specifically, each code switching unit 224 included in each mobile communication device 20 sets the code held at the time t0 to t1 in the SSDS demodulation unit 221 and the SSDS modulation unit 222, and the time slot switching unit 231 The time slot held at the time t0 to t1 is set in the TDMA control unit 23. As a result, it becomes difficult to communicate between the mobile communication devices 20 mounted on the aircrafts 30 belonging to different formations, and stable communication with high confidentiality can be realized.

  In communication using such a communication method combining the TDMA method and the CDMA method, for example, communication between the mobile communication devices 20 belonging to the same formation is performed during a period from time t2 to time t3 in FIG. During the period from time t3 to t4, the command station notifies each mobile communication device 20 of predetermined information (for example, command / control instruction, position / speed / model information of other aircraft, etc.), and from time t4 to t5. In this period, predetermined information (for example, a receipt response to the command control / guidance command) is notified from each mobile communication device 20 to the command station via the fixed communication device 10.

  In addition, during the period from time t5 to t6, information necessary for further dividing one formation into a plurality of formations in a pseudo manner or combining a plurality of formations into one formation is obtained from the command station via the fixed communication device 10. The net control transmitted to each mobile communication device 20 is performed.

Hereinafter, the net control performed from time t5 to time t6 will be described in detail.
For example, when the aircrafts 30 having the aircraft numbers F1 to F4 belong to the formation 40A as shown in FIG. 6 due to the formation of the formations 40A and 40B in the period from the time t0 to the time t1, the formation 40A May be divided into small platoons 40a and 40b. In such a case, the command station notifies each mobile communication device 20 belonging to the formation 40A of the aircraft number of each aircraft 30 belonging to the small formations 40a and 40b.

  For example, as information on the small organization, the aircraft numbers F1 and F2 as the small platoon 40a, and the information indicating that the aircraft 30 with the aircraft numbers F3 and F4 as the small organization 40b belongs to the aircraft 30 with the aircraft numbers F1 to F4. When notified to the mobile communication device 20, each mobile communication device 20 holds the information of the airframe number that belongs to the same small platoon as itself.

  For the subsequent communication, that is, the exchange of information performed at times t2 to t3, only the information from the mobile communication device 20 belonging to the same formation 40a or 40b as itself is extracted, and only the extracted information is the machine body. The information is displayed on the display device in the aircraft 30 via the interface 25. Note that information extraction can be performed by the following method, for example. For example, each mobile communication device 20 holds time slot information used by the mobile communication device 20 of the aircraft 30 belonging to the same small platoon, and therefore belongs to the same small platoon among the received information. This can be realized by extracting only the information on the time slots used by the mobile communication device 20.

  Thereby, the pilot can confirm only the information of the aircraft 30 belonging to the same small platoon as the self. When each mobile communication device 20 belonging to the formation 40A performs such processing, the formation 40A can be apparently reorganized into two formations 40a and 40b.

  Then, the mobile communication device 20 and the fixed communication device 10 can freely change the formation of the flight formation by repeatedly performing the communication processing as described above according to the time table shown in FIG. In addition, once the formation is formed, the time t0 to t1 in FIG. 5 is performed in order to change the formation of the formation. For example, the movement mounted on the aircraft 30 that is the target of the formation reorganization. The change information is notified to the communication device 20. This change information includes information on the code of the formation to be changed and information on the time slot assigned to the aircraft in the formation to be changed. Note that the code switching and the time slot switching based on the change information are performed in the same manner as the procedure for the new subscription described above.

  As described above, according to the communication system according to the present embodiment, the mobile communication device 20 automatically switches the communication conditions in accordance with the change of the composition. The communication state can be smoothly changed without giving the pilot an uncomfortable feeling of communication due to the change of the formation. This makes it possible to freely organize and reorganize a flight even after takeoff.

  Furthermore, since it is possible to instruct the aircraft 30 to form a formation after takeoff, setting operations relating to the formation to each mobile communication device 20 before departure are not necessary, reducing the human burden. be able to.

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, as an embodiment, an aircraft is taken as an example of a moving body. However, the moving body is not limited to an aircraft, and the present invention can be applied as long as it acts by a formation.

It is a figure which shows the structure of the communication system for flight formations which concerns on one Embodiment of this invention. It is a block diagram which shows schematic structure of the mobile communication apparatus of FIG. It is a block diagram which shows the structure of the fixed communication apparatus of FIG. It is a figure for demonstrating formation of the formation at the time of takeoff. It is the figure which showed the time table of the communication performed between each mobile communication apparatus and between each mobile communication apparatus and a command station. It is a figure for demonstrating formation of the small formation in the same formation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fixed communication apparatus 20 Mobile communication apparatus 21 Transmission / reception part 211 Reception part 212 Transmission part 22 SSDS control part 221 SSDS demodulation part 222 SSDS modulation part 223 Code storage part 224 Code switching part 23 TDMA control part 231 Time slot switching part 24 Coupler 25 Body Interface 26 Airframe antenna terminal 27 Aircraft antenna 30 Aircraft 31 TDMA control unit 32 SSDS control unit 321 SSDS demodulation unit 322 SSDS modulation unit 323 Code storage unit 324 Code switching unit 33 Transmission / reception unit 331 Reception unit 332 Transmission unit 34 Coupler 35 Directional antenna 36 Direction control unit 40 flight formation 50, 501-503 small zone

Claims (5)

Time-division control means mounted in each of the mobile bodies belonging to a formation comprising at least one mobile body and performing time-division multiplexing using individual time slots assigned to each of the mobile bodies in the formation; In a mobile communication apparatus having code division control means for performing code division multiplexing on a signal time-division multiplexed by the time division control means using different codes assigned to each of the formations,
After departure, formation information receiving means for receiving the change information of the formation from the command station,
Based on the change information of the formation, code switching means for switching the code used by the code division control means to a code corresponding to the change destination formation,
A mobile communication device comprising: time slot switching means for switching a time slot used by the time division control means to a time slot corresponding to a change destination formation based on the change information of the formation. The mobile does not belong to any formation at the time of departure,
The formation information receiving means receives, after departure, new participation information of a formation to which it belongs from the command station,
The code switching means, based on the new subscription information of the formation, to set a code corresponding to the formation belonging to the code to be used by the code division control means,
2. The mobile communication apparatus according to claim 1, wherein the time slot switching means sets a time slot used by the time division control means based on new subscription information of the formation. A mobile communication system comprising: a plurality of mobile communication devices mounted on each of a plurality of mobile bodies; and a fixed communication device for notifying the mobile communication device of information from a command station that determines formation of the mobile body. There,
The mobile communication device
Time-division control means for performing time-division multiplexing using individual time slots assigned to each of the mobile bodies belonging to the same formation;
Code division control means for performing code division multiplexing on a signal time-division multiplexed by the time division control means, using different codes assigned to each of the formations;
After departure, formation information receiving means for receiving the change information of the formation from the command station,
Based on the change information of the formation, code switching means for switching the code used by the code division control means to a code corresponding to the change destination formation,
A mobile communication system comprising: time slot switching means for switching a time slot used by the time division control means to a time slot corresponding to a change destination formation based on the change information of the formation. Each of the mobiles does not belong to any formation at the time of departure,
The formation information receiving means receives, after departure, new subscription information of a formation belonging from now on from the fixed communication device,
The code switching means, based on the new subscription information of the formation, to set a code corresponding to the formation belonging to the code to be used by the code division control means,
4. The mobile communication system according to claim 3, wherein the time slot switching unit sets the time slot used by the time division control unit based on the new subscription information of the formation.   Each of the formation information receiving means included in all the mobiles managed by the same command station is configured to receive the code used by the code division control means for receiving information from the command station in synchronization with each other. The mobile communication system according to claim 3 or 4, wherein information from the command station is received by switching to the same dedicated code.

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