JP2001044941A - Mobile radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To communicate a large amount of compressed data to an opposite moving body (e.g. aircraft) in a short time while securing secrecy. SOLUTION: A radio wave communication part 1 receives opposite-side information including the position of the opposite moving body (aircraft) and sends information on itself including its position to the opposite moving body. A communication control part 3 calculates communication connection conditions of a laser communication line to the opposite moving body according to the information on itself and the opposite-side information obtained by the radio wave communication part 1 and controls a laser communication part 2 under the calculated conditions to send compressed data to the opposite moving body through the connected laser communication line. Thus, the transmission is performed by connecting the laser communication line to the opposite side which moves relatively, so the data can be transmitted in a short time while secrecy is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio system suitable for data transmission between a plurality of mobile units such as aircraft and automobiles which are located in a distributed manner, or between these mobile units and fixed stations on the ground. Related to a communication device.

[0002]

2. Description of the Related Art A radio communication device having a radio transmission / reception unit is mounted on a moving body such as an airplane flying or an automobile running on the ground, and directly between the moving bodies or between the moving body and a fixed station on the ground. Or indirect communication via artificial satellites or the like.

In such a wireless communication with at least a relatively moving partner, VHF (Very) is generally used.
High Frequency (UHF) band and UHF (Ult)
Although radio waves in the (raHigh Frequency) band are often used, wireless communication has a slower data transmission speed than wired communication, so it takes a long time to transmit a large amount of data such as image information. .

[0004] However, there is a television (TV) broadcast as a means for transmitting image information or the like to a moving partner simply by using radio waves. However, in the case of TV broadcasting, information is transmitted only unilaterally, and the frequency band occupied per channel is wide. Even if transmission is performed with scrambling (encryption), the position of the radio wave transmission source is easily grasped. Having. Therefore, wireless communication, in which communication can be appropriately selected and communicated while securing the secrecy of communication in a narrow occupied frequency band, has a different role and function naturally from TV broadcasting.

[0005]

As described above, in a conventional wireless communication apparatus for communicating with a relatively moving partner, the data transmission speed is extremely low, and large-capacity data transmission such as image information is performed. It takes time.

Accordingly, an object of the present invention is to provide a mobile radio communication device capable of transmitting a large amount of data in a short time while securing confidentiality with a relatively moving partner. I do.

[0007]

According to a first aspect of the present invention, there is provided a mobile radio communication apparatus having a radio transmission / reception unit for communicating with a relatively moving partner, and transmitting self information including its own position to the partner. Based on the self-information transmitted by the radio communication unit and the partner information including the position of the partner, the compressed data is transmitted via a laser communication line connected to the partner. And a laser communication unit for transmitting to the other party.

As described above, according to the first aspect of the present invention, since the laser communication unit is provided and the data is transmitted via the laser communication line connected based on the self information and the partner information, the data is compressed while securing confidentiality. A large amount of information can be transmitted in a short time.

According to a second aspect of the present invention, in a mobile radio communication device having a radio transmission / reception unit for communicating with a relatively moving partner, the communication device receives partner information including the position of the partner transmitted from a host communication device. A radio communication unit that transmits self information including its own position to the host communication device, and a laser connected between the other party based on the partner information and the self information received by the radio communication unit. A laser communication unit for transmitting the compressed data to the other party via a communication line.

As described above, according to the second aspect, a laser communication line can be connected to a relatively moving partner based on partner information from the host communication apparatus. The compressed data can be transmitted in a short time via the connected laser communication line.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a block diagram showing a first embodiment of a mobile radio communication apparatus according to the present invention, and FIG. 2 is a diagram showing two aircraft flying with the mobile radio communication apparatus shown in FIG. FIG. 3 is an explanatory diagram showing a communication mode between the own aircraft 100 and the opponent aircraft 200).

That is, as shown in FIGS. 1 and 2,
The mobile radio communication devices mounted on the own aircraft 100 and the opponent mobile body (aircraft 200) respectively include a VHF band and a UHF band.
A radio communication unit 1 for performing radio communication using a band, and a laser communication between the other party and the mobile unit based on the relationship between the position of the other party obtained by the communication by the radio communication unit 1 and the own position. A laser communication unit 2 for connecting a line and transmitting data via the connected laser communication line.

The radio communication unit 1 communicates with the other party under the control of the communication control unit 3 as in the prior art. As shown in FIG. 1, the transmission circuit 1a and the reception circuit 1b , And can transmit and receive data such as a scheduled flight course including the current position and speed of the vehicle itself or the attitude of the aircraft via an antenna 1c attached to the aircraft.

The laser communication unit 2 connects a laser communication line to the other party's mobile unit based on the data of the other party's mobile unit obtained by the radio wave communication unit 1 and its own position data. Compressed data such as image information can be transmitted at a high speed via the laser communication line.

That is, as shown in FIG. 1, the laser communication unit 2 generates data to be transmitted and the like, and at the same time, analyzes a data transmitted from a partner mobile unit, and a laser communication unit 2a. 2, a code conversion compressor 2b for encoding the data generated in step 2 and compressing the encoded data, and a transmission circuit for modulating a laser beam with the compressed data to form a transmission signal. 2c, a platform 2d for transmitting the optically modulated wave from the transmission circuit 2c to the opponent mobile unit (aircraft 200), and a reception for receiving and demodulating the optically modulated wave received from the opponent mobile unit via the platform 2d. A circuit 2e; and a decoder 2f for decoding the received and demodulated data and supplying the decoded data to the data processing circuit 2a.
It is composed of Note that the code conversion compressor 2b is configured to be able to appropriately select various compression methods according to the type of transmission data based on a control signal from the communication control unit 3.

As described above, the laser communication line is connected and formed based on the self information including its own position and the other party information including the position of the other party moving body (aircraft 200) grasped by the radio wave communication unit 1. The control mechanism 4 is connected to the platform 2d, and controls the platform 2d so that the laser communication line maintains a stable connection state for a set time length.

Platform 2d in control mechanism 4
Is formed as follows.

That is, as shown in FIG. 1, an onboard inertial navigation system (INS: Intelligent Navig
ation System) or GPS (Glo
bal Positioning System Sa
(Tellite) The receiver 5 measures its own accurate current position information.

The own aircraft 100 has data of a planned flight course stored in advance in a planned flight data storage unit 6 composed of a RAM or the like. The data stored in the planned flight data storage unit 6 and the INS / GPS are stored. The current position data measured by the receiver 5 and the current flight speed data and body attitude data obtained from a steering mechanism 7a of the steering system 7 described later are sequentially supplied to the correction arithmetic circuit 8.

The correction arithmetic circuit 8 sequentially introduces data of the flight course of the self-aircraft 100 and data such as the current position, the flight speed and the attitude of the airframe, and smoothes the data intermittently supplied by so-called filtering processing. The transmission circuit of the radio wave communication unit 1 forms more accurate self-information (data) by correcting the delay error or the like generated in the steering of the body by lever arm correction processing. 1a.

In this embodiment, as shown in FIG. 1, the inertial sensor 9 is mounted on the platform 2d,
The moment of inertia during the drive control of the platform 2d is detected and supplied to the correction operation circuit 8, so that more accurate self information can be obtained at any time.

In this manner, the self information such as the current position supplied to the transmission circuit 1a is modulated and amplified by the known transmission circuit 1a, and is sequentially transmitted from the antenna 1c to the other mobile unit (aircraft 200). .

On the other hand, partner information (data) corresponding to the so-called self information such as the current position, flight speed, and scheduled flight course of the partner mobile unit (aircraft 200) is introduced via the antenna 1c of the radio wave communication unit 1. After being demodulated by the receiving circuit 1b, the signal is supplied to the communication control unit 3.

Therefore, the communication control unit 3 controls the correction operation circuit 8
(Aircraft 200) and self (self-machine 100) based on accurate self-information from
Relative position data is obtained to determine whether there is a possibility of laser communication line connection on both the planned flight courses, and communication connection conditions (commands) within the range where connection is possible, ie, laser light emission The direction, the laser communication start time, and the communication time length are calculated.

The communication control unit 3 transmits the calculated communication connection conditions to the other mobile unit (aircraft 200) via the radio wave communication unit 1, and also transmits the data processing circuit 2a and the control mechanism 4 of the laser communication unit 2 to the other. And instructs generation of transmission data and drive control of the platform 2d.

In this manner, the communication connection conditions once transmitted to the other party's mobile unit are also sequentially reviewed based on the subsequent relative position data continuously obtained by the communication control unit 3. Modifications are made.

In view of this, the platform 2d of the laser communication unit 2 is controlled so that the laser beam is directed toward the other party's moving body while always tracking the other party's moving body in accordance with the communication connection conditions. Since the light beam width of the laser communication line connected in 2 is extremely narrow, even slight changes that occur between the other party, such as the flight course or attitude, affect the communication conditions, and the laser communication line is disconnected. May be done.

When the communication control unit 3 detects a change in the situation that affects the calculated communication connection condition,
The flight management processing circuit 7b of the steering system 7 is controlled to avoid the influence of the change. Therefore, the flight management processing circuit 7b controls the manual operation by the flight control 1b or the pilot 1c so as to satisfy the communication connection condition while referring to the data from the flight schedule data storage unit 6, so that the steering mechanism 7a of the aircraft is Therefore, the platform 2d can follow the other party's moving body and secure a stable connection of the laser communication line.

However, it is not always easy to fly accurately on the scheduled course.
0, the other aircraft 200), the laser communication unit 2
It is desired to further increase the probability of transmission and reception in. Therefore, the transmitting and receiving antennas such as the platform 2d are connected to the left and right sides (a) and the left and right main wings (b) of the upper part of the fuselage as shown in FIG. C), so that the field of view for transmitting and receiving light can be further expanded.

In the configuration shown in FIG. 1, it has been described that the code conversion compressor 2b compresses a large amount of data such as image information and transmits the data in a short time by laser communication. If the image to be taken is information obtained by imaging a specific area with a reconnaissance aircraft or a reconnaissance satellite,
The transmission data amount can be efficiently reduced, and transmission within a shorter connection time of the laser communication line is possible.

That is, in a reconnaissance aircraft or the like, it is often performed to re-image and transmit an area once imaged in the past. Of course, even in such a case, the code conversion compressor 2b shown in FIG. 1 can compress the image information captured each time and supply the compressed image information to the transmission circuit 2c. The transmission data amount is reduced by correlation processing or image graphics processing.

That is, FIG. 4A illustrates a code conversion compressor 2b for performing data reduction by correlation processing.
The image data of the imaging region imaged by the imaging camera 2aa is assigned an identification code for each of the divided imaging regions, sequentially stored in the image database 2ab, and a code conversion compressor 2b configured by a correlation processing circuit 2ba. Is supplied to the transmission circuit 2c via the.

Therefore, the correlation processing circuit 2ba firstly uses the photographing camera 2 out of the image data stored in the image database 2ab with the photographing time, the photographing position and the like as keywords.
The image data closest to the new image data supplied from aa is extracted.

In the comparison and extraction, the captured image from the image capturing camera 2aa and the captured image read out from the image database 2ab are divided into blocks in the vertical and horizontal directions to form a block, and the image of each corresponding block is compared. Then, an already captured screen having a similar image pattern is extracted as approximate image data.

Accordingly, the correlation processing circuit 2ba extracts only a different portion between the similar imaged screen and the imaged screen to be transmitted this time, and for example, extracts a known discrete cosine transform (Discrete Cosine Transform).
m) and run-length encoding (run-length-
The data is compressed using coding or the like, an identification code is added to the compressed approximate image data, and the compressed approximate image data is supplied to the transmission circuit 2c. Therefore, the amount of transmission data can be reduced.

FIG. 5A illustrates another code conversion compressor 2b for performing data reduction by image / graphics processing. FIG. 5A is supplied from an imaging camera 2aa.
The captured image information as shown in (b) is converted by a code conversion compressor 2 composed of an image / graphics conversion circuit 2ba.
b.

Image / graphics conversion circuit 2ba
Converts the supplied image information into a graphic whose information amount is reduced by simplification, correlation, and layering, as shown in FIG. The reduced image information is supplied to the transmission circuit 2c through conversion into graphic commands.

As described above, the code conversion compressor 2b can employ various compression conversion methods, and is appropriately selected by the control of the communication control unit 3 in accordance with the type of data to be transmitted.

The operation procedure of the mobile radio communication device according to the first embodiment described above will be further described with reference to the flowchart shown in FIG.

That is, first, the radio wave communication unit 1 connects with the mobile radio communication device of the other party's mobile unit (aircraft 200), which is the communication partner, through the communication of the radio wave communication unit 1 (step S1).
1) At the same time as acquiring the other party information such as the scheduled flight course including the current position and speed of the other party's moving body that is the communication partner, the other party also uses the other party's own information such as the flight course including the current location and speed of the self (aircraft 100). The message is transmitted to the moving body (step S12).

Next, the communication control unit 3 fetches the partner information received by the receiving circuit 1b of the radio wave communication unit 1 and establishes a laser communication line connection with the predicted partner vehicle on the ego flight course. The possibility is determined (step S13). If the possibility is determined, the laser communication line such as the communication capacity, communication start time and communication time length of the data to be transmitted is determined based on the acquired partner information and self information. A connection condition is calculated, and a communication connection condition (command) is generated based on the calculation result (step S14).

Next, the communication control unit 3 transmits the generated communication connection conditions to the other party's mobile unit via the radio wave communication unit 1 and supplies the same to the laser communication unit 2 and the control mechanism 4 so that the other party's mobile unit can communicate with the other party's mobile unit. During this period, generation of transmission data corresponding to communication connection conditions and connection of a laser communication line are instructed.

Therefore, the data processing circuit 2a of the laser communication unit 2 generates data to be transmitted such as image data based on the communication connection conditions and supplies the data to the code conversion / compression circuit 2b. The signal is transmitted to the partner mobile wireless communication device via the connected laser communication line via the circuit 2c and the platform 2d sequentially (steps S15 and S16).

As described above, the mobile radio communication device according to the first embodiment can be realized with a simple configuration in which the laser communication unit 2 and its control mechanism 4 and the like are added to the existing radio communication unit 1, and With the laser communication line connected according to the connection conditions, large-volume compressed data can be transmitted to the other party's mobile body or received from the other party in a short time while secrecy is secured.

In the above embodiment, both the mobile radio communication apparatus and the mobile radio communication apparatus are mobile units (aircraft 10).
0, 200), the mobile radio communication device communicates via a laser communication line that is connected for a short time between relative movements. When the other party is a mobile object such as an aircraft, of course, the other side is mounted on a mobile object such as an aircraft, and the other party is a ground station or a car or ship with a low speed. Even if there is, the same can be applied.

However, the mobile radio communication device has a partial configuration related to it under a situation in which one of itself and the other party is a fixed station.
That is, since the INS / GPS receiver 6, the flight schedule data storage unit 6, and the steering system 7 are not provided, the configuration of the correction operation circuit 8 and the like can be simplified.

On the other hand, if the mobile station is moving and the remote station is a fixed station in which the remote station has been positioned in advance, it is possible to read out and use the remote station information registered in advance in the ROM or the like. Thus, the data amount of the partner information acquired each time can be significantly reduced.

As described above, the mobile radio communication device according to the first embodiment has a
First of all, it communicates with him by conventional radio communication,
It is determined whether or not laser communication is possible based on the self information and the partner information. Based on the result of the determination, a laser communication line is connected to the communicable partner mobile unit, thereby ensuring security (confidentiality). In addition, communication of compressed data such as image information can be efficiently transmitted.

Next, in the first embodiment shown in FIGS. 1 to 6, radio wave communication and laser communication are directly performed between the self side (aircraft 100) and the opponent mobile body (aircraft 200). I explained what to do. However, in recent years where satellites are widely used in aeronautical communication and navigation control, the position of a flying aircraft, flight course, etc. are registered in advance or as needed in a host communication device mounted on a geostationary satellite. Can read and use this.

That is, by radio communication with the host communication device, the other party information of the communication partner is read out, the position data is calculated, and the other mobile unit is relayed by radio communication with the other party relaying the host communication device. A laser communication line can be connected to the wireless communication device.

FIG. 7 shows a mobile radio communication apparatus using a geostationary satellite according to a second embodiment of the present invention. The geostationary satellite 300 has a host communication device mounted therein. In the computer, the self information and the other information including the information on the positions and the moving speeds of the own aircraft 100 and the other aircraft 20 are registered in advance by radio wave communication.

Therefore, the contents of the other party's position information and the like registered in the host communication device are, as shown in FIG.
Are acquired by radio wave communication via the personal computer, so that the position information can be obtained based on the acquired partner information and self information prepared in advance. On the basis of the position data, a laser communication line is connected between the aircraft 100 and the aircraft 200, and the own aircraft 100 and the opponent aircraft 200 (the opponent moving body) are connected in the same manner as in the first embodiment. Compressed data such as image signals can be efficiently transmitted and received between them via the connected laser communication line.

As described above, in the second embodiment,. Upon connection of the laser communication line between the aircraft 100 and the aircraft 200, by radio communication relaying the geostationary satellite 300,
Since the position data is formed, unlike the first embodiment, there is no need to perform radio communication while tracking a moving partner, and a laser communication line can be efficiently connected in a short time.

In the second embodiment, the description has been made such that the position data of the ego is mounted on the geostationary satellite 300 and the radio communication is performed via the host communication device. The same function can be achieved by using a device.

Next, in the first and second embodiments, the self side (aircraft 100) is operated by the other party (aircraft 2).
00) and directly or indirectly through indirect radio communication via a fixed station such as the geostationary satellite 300 to acquire partner information.
It has been described that the position data is formed based on the acquired partner information and that the laser communication line is connected. However, there is a large distance between the communication target partner and the mobile unit (aircraft 200). In particular, it may be difficult to connect a laser communication line having straightness. At that time, by relaying another mobile unit (aircraft) that is located between the two aircraft and also has a mobile wireless communication device mounted thereon, the other target mobile unit (aircraft 200) is finally targeted. On the other hand, compressed data can be transmitted.

FIG. 8 is a block diagram showing a third preferred embodiment of the mobile radio communication apparatus according to the present invention for transmitting compressed data to the other party via a relay.

That is, when it is difficult to directly connect a laser communication line between the aircraft 100 and 200 flying at a large distance, the other aircraft 400 flying between the aircraft 100 and the aircraft 200 , 500
Can be sequentially selected and the compressed data can be transmitted through them.

That is, similarly to the first embodiment, first, a laser communication line based on radio wave communication is connected between the aircraft 100 and the nearby aircraft 400, and the compressed data is transmitted to the aircraft 400. And then aircraft 400 also has a nearby aircraft (500,600)
By selecting the aircraft 500 to which the laser communication line can be more reliably connected, performing data transmission by the laser communication line, and finally through the laser communication line similarly connected between the aircraft 500 and the aircraft 200 , Aircraft 10
0 from the final destination aircraft 200
Can be transmitted.

In the third embodiment, the relay is performed via an intermediate device (aircraft 400, 500). However, host communication such as a geostationary satellite or a ground station described in the second embodiment is partially performed. Configured to relay via radio communication with the device,
A laser communication line can be efficiently connected.

FIG. 9 shows a fourth embodiment to which the mobile radio communication device according to the present invention is applied, in which compressed data from the own device 100 is transmitted to a ground station 700 as a final destination. Each of the aircraft 100, 400, and 500 on the way to relay is a geostationary satellite 300.
While receiving the radio communication of the host communication device, the last aircraft 500
And relays the compressed data from.

In this embodiment, the host communication device mounted on the geostationary satellite 300 transmits a communication request transmitted from its own device 100, that is, a final communication target destination (ground station 700) and transmitted data. It is possible to receive the capacity and the like, search the information registered in the computer, select and extract the aircraft that can be relayed optimally, and instruct the aircraft to perform a relay operation.

As described above, the mobile radio communication device according to the present invention connects the laser communication line based on the self-position data acquired by radio communication while relatively moving, and thus uses the laser communication line. Thus, a large amount of data can be transmitted in a short time, and excellent effects can be obtained in practical use.

[0064]

As described above in detail, according to the present invention, in a mobile radio communication apparatus for communicating with a relatively moving partner, confidentiality is ensured by a connected laser communication line. Data can be transmitted accurately and efficiently, and the effect is practically large when transmitting image information and the like.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a mobile radio communication device according to the present invention.

FIG. 2 is a configuration diagram showing an inter-mobile communication mode of the mobile wireless communication device shown in FIG. 1;

FIG. 3 is an explanatory diagram showing an example of a mounting arrangement of a platform to an aircraft fuselage in the apparatus shown in FIG. 1;

4 is a configuration diagram illustrating an example of a circuit of a code conversion compressor of the device illustrated in FIG. 1;

5 (a) is a configuration diagram showing another example of a circuit of the code conversion compressor of the apparatus shown in FIG. 1, and FIG. 5 (b) is a diagram showing FIG. 5 (a).
FIG. 4C is a converted image pattern diagram of the code conversion compressor.

FIG. 6 is a flowchart showing the operation of the apparatus shown in FIG.

FIG. 7 is a configuration diagram showing a second embodiment to which the mobile radio communication device according to the present invention is applied.

FIG. 8 is a configuration diagram showing a third embodiment to which the mobile radio communication device according to the present invention is applied.

FIG. 9 is a configuration diagram showing a fourth embodiment to which the mobile radio communication device according to the present invention is applied.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 radio wave communication unit 1a transmission circuit 1b reception circuit 2 laser communication unit 2a data processing circuit 2b code conversion compressor 2c transmission circuit 2d platform 2e reception circuit 2f decoding circuit 3 communication control unit 4 control mechanism 5 INS / GPS receiver 6 scheduled flight Data storage unit 7 Steering system 8 Correction operation circuit 9 Inertial sensor 100, 200, 400, 500, 600 Aircraft 300 Geostationary (artificial) satellite 700 Ground station

Claims (3)

[Claims] 1. A mobile radio communication device having a radio transmission / reception unit and communicating with a relatively moving partner, a radio communication unit transmitting self-information including a position of the radio communication unit to the partner, and a radio communication unit A laser communication unit that transmits compressed data to the other party via a laser communication line connected to the other party based on the self information transmitted and the other party information including the position of the other party. A mobile radio communication device comprising: 2. The mobile radio communication device according to claim 1, wherein the partner information is received via the radio communication unit. 3. A mobile wireless communication device having a wireless transmission / reception unit and communicating with a relatively moving partner, receives a partner information including the position of the partner transmitted from a host communication device, and A radio communication unit that transmits self-information including a position to the host communication device; and, based on the partner information and the self information received by the radio communication unit, via a laser communication line connected to the other party. And a laser communication unit for transmitting the compressed data to the other party.