JP4882815B2 - Mobile communication device - Google Patents

Description

  The present invention relates to a mobile communication device, and more particularly to a mobile communication device that performs transmission and reception by switching between a directional antenna and an omnidirectional antenna.

  FIG. 10 shows a configuration diagram of an example of a conventional mobile communication apparatus. In the figure, the mobile communication device comprises a controller 1 and a transceiver 31. The transceiver 31 includes a directional antenna 16 and an omnidirectional antenna 17. The changeover switch 32 has a function of switching between the directional antenna 16 and the omnidirectional antenna 17 by the change control unit 33 of the controller 1. The changeover switch 32 is mounted between the circulator 15 and each of the antennas 16 and 17, and is configured to simultaneously switch both transmission and reception to the directional antenna 16 or the omnidirectional antenna 17.

  The controller 1 includes a communication control unit 2, an antenna directivity direction control unit 6, a decoder 7, an encoder 8, and a switching control unit 33. The decoder 7 decodes the signal from the opposite station 34 received by the receiving unit 11 in the transmitter / receiver 31 to obtain the reception information 20 and outputs it via the communication control unit 2. The encoder 7 receives predetermined information 3 such as image data, self-position / altitude / attitude information 4, opposite station position / altitude information (initial information) 5, etc. via the communication control unit 2, and inputs them in a predetermined manner. The encoded signal is output to the transmitter 12 in the transceiver 31. A transmission signal from the transmission unit 12 is transmitted to the opposite station 34 via the circulator 15, the changeover switch 32, the directional antenna 16 or the omnidirectional antenna 17. The opposite station 34 may be a mobile station.

  A transmission signal is amplified by a power amplifier, output to an antenna through a transmission selector switch and a circulator, and a reception signal input from the antenna is provided with a local oscillation unit having a transmission system that is input to a low noise amplifier through a circulator. Conventionally, wireless devices are also known (see, for example, Patent Document 1).

  Further, in a mobile communication system for setting a communication line using a modulator / demodulator and a communication channel allocated by a macro cell base station between the macro cell base station and a mobile terminal, the macro cell base station is designated among a plurality of antennas. There is known a configuration including a switch circuit having a switch matrix configuration for switching and connecting the antenna and a designated modulator / demodulator among a plurality of modulators / demodulators (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 10-303830 Japanese Patent No. 2777861

  However, in the conventional mobile communication device shown in FIG. 10, when the directional antenna 16 is used to transmit the predetermined information 3 such as image data, the directivity direction of the directional antenna 16 is opposed due to the influence of disturbance or the like. There is a possibility that communication is locked off without facing the station 34 direction. In order to restore the communication line when the directional antenna 16 is locked off during use, control for directing the directional antenna 16 in the direction of the opposite station 34 is necessary again, but the opposite station 34 moves. In the case of a mobile station, the position changes every moment, and directivity control cannot be performed immediately. On the other hand, when switching to the omnidirectional antenna 17, there is no need for directivity control, but since the antenna gain is low, there is a significant shortage of reach and a decrease in transmission speed, making it difficult to establish a communication line.

  Therefore, in the conventional mobile communication device, both transmission and reception can be set only to the same type of antenna, either the directional antenna 16 or the omnidirectional antenna 17, and individual transmissions according to the transmission speed or communication distance of transmission or reception are possible. Cannot be selected, and there is a problem that lock-off may occur. Further, in the above-described conventional mobile communication device, there is a problem that it is difficult to restore the communication line unless it is in a communicable range with the omnidirectional antenna 17 when it is locked off.

  The invention described in Patent Document 1 is a configuration in which only a transmission wave is output to an antenna via a transmission changeover switch and a circulator, and a reception wave is input to the low-noise amplifier via only the circulator without passing through the changeover switch. Further, the invention described in Patent Document 2 only discloses a configuration in which a macro cell base station in a mobile communication system includes a switch circuit that switches a plurality of antennas. Even if both are combined, transmission and reception are switched antennas. The mobile communication device to be switched with cannot be configured.

  The present invention has been made in view of the above points, and has a directional antenna and an omnidirectional antenna, and has a function of freely switching between transmission and reception, so that communication distance and transmission speed can be reduced. An object of the present invention is to provide a mobile communication device capable of constructing a communication line according to the demand and capable of constructing a stable communication line.

In order to achieve the above object, the present invention is a mobile communication device that has a directional antenna and an omnidirectional antenna, and performs transmission or reception by selecting the directional antenna and the omnidirectional antenna. and one of the antenna and omni-directional antenna and transmitting antenna, one or antenna selection for shared to use each time the other as a receiving antenna, or directional antennas and an omnidirectional antenna while as transmit and receive antennas means and the orientation control means for controlling, based on the position information of the opposite station in the directivity reception signals of the directional antenna, and generating at least includes transmission information location information indicating the location of the own apparatus, and characterized in that it has a transmission information generating means for transmitting a directional antenna or an omnidirectional antenna is selected by the antenna selection means That. In the present invention, since the directional antenna and the omnidirectional antenna can be switched freely for transmission and reception, the antenna gain and the antenna coverage can be freely changed.

  In order to achieve the above object, the present invention provides a lock-off detecting means for detecting that the directional antenna is locked off, and a omni-directional antenna in place of the directional antenna when detecting the lock-off. The first antenna switching control means for controlling the antenna selection means to be used, and the lock-off information indicating that the own apparatus is in the lock-off state when the lock-off is detected, use the omnidirectional antenna to the opposite station. And a lock-off state transmitting means for transmitting the information.

  In the present invention, when a lock-off is detected when using a directional antenna, the directional antenna used until then is switched to use the omni-directional antenna, so that the transmission signal from the opposite station can be received. it can.

  In order to achieve the above object, according to the present invention, when lock-off information is received, the second transmission rate is lower than that of the first transmission information transmitted by the directional antenna used as the transmission antenna. Transmission information switching means for switching and transmitting the transmission information. In the present invention, since the second transmission information having a transmission speed slower than the first transmission information transmitted using the directional antenna is transmitted, the omnidirectional antenna has a lower gain than the directional antenna. Can be used.

  In order to achieve the above object, the present invention uses return detection means for detecting that the device has returned from the lock-off state, and uses a directional antenna instead of an omnidirectional antenna when the return is detected. And a second antenna switching control means for controlling the antenna selection means. In the present invention, when returning from the lock-off state, it is possible to automatically return to the original state.

In order to achieve the above object, according to the present invention, the antenna selection unit is configured to control the transmission output, each antenna gain of the directional antenna and the omnidirectional antenna, the transmission distance with the opposite station, and the transmission speed of the transmission data The directional antenna and the omnidirectional antenna are selected as transmitting antennas or receiving antennas.

  Furthermore, in order to achieve the above object, the present invention provides an antenna selecting means having first to fourth terminals, the first terminal being connected to the directional antenna, and the second terminal being non-existent. Connected to the directional antenna, straight connection between the first terminal and the third terminal, and between the second terminal and the fourth terminal, or between the first terminal and the fourth terminal, and A matrix switch connected between the second terminal and the third terminal, a third switch and a fourth terminal of the matrix switch, and an input end of the reception unit and an output end of the transmission unit. It is characterized by having a changeover switch means for switching connection.

  According to the present invention, the antenna gain and the antenna coverage can be freely changed by freely switching between the directional antenna and the omnidirectional antenna for transmission and reception. A communication line according to the distance and the information transmission speed can be constructed, and a stable communication line can be constructed.

  In addition, according to the present invention, when lock-off is detected when a directional antenna is used, a transmission signal from the opposite station can be received because switching is performed to use an omnidirectional antenna. Since the transmission information is switched to the later transmission information, the communication line can be easily restored.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration diagram of an embodiment of a mobile communication apparatus according to the present invention. As shown in the figure, the mobile communication device of the present embodiment includes a controller 1 and a transceiver 10. The controller 1 includes a communication control unit 2, an antenna directivity direction control unit 6, a decoder 7, an encoder 8, and a switching control unit 9. The transceiver 10 includes a reception unit 11, a transmission unit 12, a changeover switch 13, a matrix switch 14, a circulator 15, a directional antenna 16, and an omnidirectional antenna 17. The directional antenna 16 and the omnidirectional antenna 17 are switched by the changeover switch 13 and the matrix switch 14.

  The communication control unit 2 of the controller 1 receives the predetermined information 3 such as image data, the self-position / altitude / attitude information 4 and the opposite station position / altitude information 5 as inputs, and receives the predetermined information 3 such as image data, the self-position / The altitude / attitude information 4 is supplied to the encoder 8. The encoder 8 formats the predetermined information 3 such as input image data and the self-position / altitude / attitude information 4 as transmission data 18 by a predetermined method, and outputs the data to the transmission unit 12 in the transceiver 10.

  The transmission unit 12 generates a transmission signal by performing modulation of the input transmission data 18 and conversion processing to a predetermined frequency. This transmission signal is transmitted to the opposite station 21 by the directional antenna 16 or the omnidirectional antenna 17 via the changeover switch 13, the matrix switch 14, and the circulator 15, respectively. The directivity antenna 16 is an antenna having high gain directivity in a specific direction, and the directivity direction is controlled by the antenna directivity direction control unit 6 of the controller 1. The antenna directivity direction control unit 6 starts control based on the counter station position / altitude initial information 5 input via the communication control unit 2 at the initial stage of communication. After the communication line with the counter station 21 is established, the antenna directivity direction control unit 6 It is controlled by the counter station position and altitude information included.

  The omnidirectional antenna 17 is an antenna having a uniform gain in the entire circumferential direction, and does not require directivity control. However, the gain is lower than that of the directional antenna 16. For the selection of the directional antenna 16 and the omnidirectional antenna 17, a changeover switch 13 and a matrix switch 14 are arranged. These switches 13 and 14 switch connection destinations independently of each other based on a command from the switching control unit 9 of the controller 1. The changeover switch 13 switches between the matrix switch 14 side and the circulator 15 side. The circulator 15 has a function of performing transmission / reception with the same antenna. The matrix switch 14 can select the directional antenna 16 and the omnidirectional antenna 17 on the changeover switch 13 side or the circulator 15 side.

  The receiving unit 11 in the transmitter / receiver 10 is supplied with a radio wave reception signal from the opposite station 21 received by the directional antenna 16 or the omnidirectional antenna 17 via the circulator 15 and down-converts it to a predetermined frequency. Demodulated to generate and output received data 19. The decoder 7 in the controller 1 makes a lock-on determination on the reception data 19 supplied from the reception unit 11 and outputs reception information 20 in the lock-on state.

  Next, the switching operation of the switch according to the present embodiment will be described in detail with reference to FIGS. The changeover switch 13 and the matrix switch 14 change the connection destination based on a command from the changeover control unit 9 of the controller 1. There are four switching modes as shown in FIGS. 2 to 5, the same components as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 2 shows a first switching mode in which the directional antenna 16 is selected for both transmission and reception by setting the selector switch 13 on the circulator 15 side and the matrix switch 14 in a straight connection. FIG. 3 shows a second switching mode in which the omnidirectional antenna 17 is selected for both transmission and reception by cross-connecting the selector switch 13 to the circulator 15 side and the matrix switch 14.

  FIG. 4 shows a third switching mode in which the omnidirectional antenna 17 is used for transmission and the directional antenna 16 is used for reception by setting the changeover switch 13 to the matrix switch 14 side and the matrix switch 14 in a straight connection. FIG. 5 shows a fourth switching mode in which the directional antenna 16 is used for transmission and the omnidirectional antenna 17 is used for reception by setting the selector switch 13 on the matrix switch 14 side and the matrix switch 14 in a cross connection.

  Returning to FIG. The communication control unit 2 selects the information to be transmitted, adds the self-position / altitude / attitude information 4 to the predetermined information 3 such as image data, and the transmission data or the self-position / altitude / attitude information 4 The transmission data having a low transmission rate can be generated, and the operation is performed by a program that is switched by the lock-on information of the decoder 7 or the like.

  Here, the transmission output P, the antenna gain G, the transmission distance D, and the transmission speed R have the following relationship.

P ・ G∝D ²・ R
When the transmission output P is constant, when a communication line is established with the directional antenna 16 at a certain transmission distance D, the directional antenna 16 has a high gain, so that communication at a high transmission speed can be performed. Since the antenna coverage is narrow, it is necessary to control the antenna directing direction while always grasping the position of the opposite station 21. On the other hand, the omnidirectional antenna 17 has a low transmission speed because of its low gain, but the antenna coverage direction control is unnecessary because the antenna coverage is the entire circumference.

  Therefore, in this embodiment, when performing communication at a predetermined transmission distance D using this, the communication system using the predetermined information 3 such as image data as transmission data selects the directional antenna 16, Realize high transmission speed. The other system makes it possible to select the omnidirectional antenna 17 that can receive the opposite station position / altitude information 5 necessary for controlling the directional direction of the directional antenna 16. In addition, if the communication system of the predetermined information 3 such as image data is locked off and directivity control of the directional antenna 16 becomes impossible, the transmission data is immediately transmitted to the self-position / altitude / attitude information. 4 and selecting the omnidirectional antenna 17 facilitates the return of the communication line. After the return, the communication system using the predetermined information 3 such as image data as the transmission data is directional as before. The antenna 16 is selected again.

  As described above, the present embodiment includes the directional antenna 16 and the omnidirectional antenna 17 and has a function of freely switching each of them for transmission and reception, so that the communication distance and the transmission speed can be selected. A stable communication line can be provided.

  Next, Example 1 of the present invention will be described with reference to the drawings. FIG. 6 shows a block diagram of a mobile communication system provided with Embodiment 1 of the mobile communication apparatus according to the present invention. The mobile communication system according to the present embodiment includes mobile bodies 41 and 51 which are mobile communication apparatuses of the present invention, and a fixed station 71, and an image captured by the camera 42 of the mobile body 41 is relayed and fixed by the mobile body 51. This is a system for transmitting to the station 71. The moving body 41 and the moving body 51 are separated from each other by a transmission distance D1.

  The moving body 41 includes a camera 42, a camera pointing direction controller 43, a controller 44, a transceiver 45, a GPS receiver 48, an altimeter 49, and an INS terminal 50. The transceiver 45 includes a directional antenna 46 and an omnidirectional antenna 47. The GPS receiver 48 constitutes a part of a global positioning system (GPS), receives a GPS signal transmitted from a GPS satellite which is an artificial satellite, and acquires position information of the device itself. . The INS terminal 50 is a terminal in an inertial navigation system (INS: Inertia Navigation System) that controls the inertial navigation of an aircraft, and measures attitude data of the pitch angle, yaw angle, roll angle, and respective angular velocities of the aircraft by a known method. Can be output.

  The moving body 51 includes a controller 52, a transceiver 53, a controller 56, a transceiver 57, a GPS receiver 60, an altimeter 61, and an INS terminal 62. The transceiver 53 includes a directional antenna 54 and an omnidirectional antenna 55. The transceiver 57 includes a directional antenna 58 and an omnidirectional antenna 59. Similar to the GPS receiver 48, the GPS receiver 60 receives a GPS signal transmitted from a GPS satellite and acquires position information of the device itself. Similar to the INS terminal 50, the INS terminal 62 is a communication terminal connected to the INS network.

  The fixed station 71 includes a controller 72 and a transceiver 73, and the transceiver 73 is provided with a directional antenna 74 and an omnidirectional antenna 75. The transmitter / receiver 73 of the fixed station 71 and the transmitter / receiver 57 of the moving body 51 communicate with each other through the uplink 81 and the downlink 82. The transmitter / receiver 45 of the mobile body 41 and the transmitter / receiver 53 of the mobile body 51 communicate via the uplink 83 and the downlink 84.

  The transmission information of the uplink 81 is photographing instruction information 76 from the fixed station 71 to the moving body 51, and the data capacity is a low speed of about several tens of kbps. Also, the transmission information of the uplink 83 is information such as the shooting instruction information 76 from the moving body 51 to the moving body 41 and the position / altitude of the moving body 51, and the data capacity is a low speed of several tens of kbps. The shooting instruction information 76 here is information relayed from the fixed station 71.

  The transmission information of the downlink 84 is image information 40 from the moving body 41 to the moving body 51 and information such as the position and altitude of the moving body 41, and the data capacity is a high speed of several Mbps. The transmission information of the downlink 82 includes image information 40 from the mobile unit 51 to the fixed station 71 and information such as the position and altitude of the mobile unit 41 and the mobile unit 51, and the data capacity is a high speed of several Mbps. . The information such as the position / altitude of the image information 40 and the moving body 41 here is obtained by relaying information received from the moving body 41.

  The mobile unit 41 can select either the directional antenna 46 or the omnidirectional antenna 47 by the transmitter / receiver 45. When the directional antenna 46 is selected, the controller 44 converts the transmission information of the uplink 83 into the transmission information. Based on the position information of the mobile body 51 included, the position data from the GPS receiver 48, the altitude data from the altimeter 49, and the attitude data from the INS terminal 50 are used, and the direction of the directional antenna 46 in the direction of the mobile body 51 is used. By controlling the directivity direction, transmission / reception of the uplink 83 and the downlink 84 is enabled.

  In addition, the mobile unit 41 uses position data from the GPS receiver 48, altitude data from the altimeter 49, and attitude data from the INS terminal 50 based on the imaging instruction information 76 included in the transmission information of the uplink 83. However, the camera directivity direction controller 43 controls the directivity direction of the camera 42, and the camera 42 acquires an image. Further, the moving body 41 is combined with the image information 40 acquired by the camera 42, the position data of the moving body 41 from the GPS receiver 48, the altitude data from the altimeter 49, etc. The data is transmitted to the mobile unit 51 via the link 84.

  The mobile body 51 performs two systems of communication. That is, the mobile unit 51 communicates with the mobile unit 41 by the transceiver 53 and communicates with the fixed station 71 by the transceiver 57. The mobile body 51 can select either the directional antenna 54 or the omnidirectional antenna 55 by the transmitter / receiver 53, and when selecting the directional antenna 54, the transmission information of the downlink 84 is converted by the controller 52. Based on the position information of the mobile body 41 included, the position data of the mobile body 51 from the GPS receiver 60, the altitude data of the mobile body 51 from the altimeter 61, and the attitude data of the mobile body 51 from the INS terminal 62 are used. However, transmission / reception of the uplink 83 and the downlink 84 is enabled by controlling the directivity direction of the directional antenna 54 in the direction of the moving body 41.

  Further, the mobile body 51 can select either the directional antenna 58 or the omnidirectional antenna 59 by the transmitter / receiver 57. When the directional antenna 58 is selected, the controller 56 uses the known fixed station 71. Based on the position information of the mobile station 51, the position data of the mobile body 51 from the GPS receiver 60, the altitude data of the mobile body 51 from the altimeter 61, and the attitude data of the mobile body 51 from the INS terminal 62 are used. Further, by controlling the directivity direction of the directional antenna 58, the uplink 81 and the downlink 82 can be transmitted and received.

  In addition, the mobile unit 51 receives the imaging instruction information 76 included in the transmission information of the uplink 81, and the transmitter / receiver 53 combines the imaging instruction information 76 with the position data and altitude data of the mobile unit 51, The uplink 83 is transmitted to the mobile body 41 using the directional antenna 54. In addition, the captured image information 40 and the position data and altitude data of the mobile unit 41 included in the signal of the downlink 84 are received, and the transmitter / receiver 57 receives the captured image information 40 and the position data and altitude data of the mobile unit 41. The position data and altitude data of the mobile 51 are combined and transmitted to the fixed station 71 as the downlink 82 using the directional antenna 58.

  In the fixed station 71, the transmitter / receiver 73 communicates with the moving body 51. The fixed station 71 can select either the directional antenna 74 or the omnidirectional antenna 75 by the transmitter / receiver 73. When the directional antenna 74 is selected, the fixed station 71 is included in the transmission information of the downlink 82 by the controller 72. By controlling the directivity direction of the directional antenna 74 in the direction of the mobile body 51 using the known fixed station 71 position data based on the position information of the mobile body 51, the uplink 81 and the downlink 82 can be transmitted and received. It is said. In the fixed station 71, the shooting instruction information 76 is transmitted to the moving body 51 through the uplink 81, and the shooting image information 40, the position data of the moving body 41 and the moving body 51, altitude data, and the like are transmitted through the downlink 82. Get information about.

  Next, the operation of this embodiment will be described in detail. As described above, when the transmission output of the transceiver is P, the antenna gain is G, the transmission distance is D, and the transmission speed is R, there is the following relationship between them.

P ・ G∝D ²・ R (1)
Therefore, for example, when the transmission output P and the transmission distance D are constant, the transmission rate R can be increased 1000 times by increasing the antenna gain G 1000 times. On the other hand, when the transmission output P and the transmission speed R are constant, the transmission distance D can be increased 33 times by increasing the antenna gain G 1000 times.

  In this embodiment, the transmission output of the transmitter / receiver 45 and the transmitter / receiver 53 is P = 10 W. The controller 44 transmits, as transmission data, high transmission rate image information + mobile unit 1 position / altitude information R1, medium transmission rate mobile unit 1 position / altitude information R2, and low transmission rate mobile unit 1 position / altitude information R3. Can be selected. Here, the transmission speed r1 of the image information + mobile body 1 position / altitude information R1 is 50 Mbps, the transmission speed r2 of the mobile body 1 position / altitude information R2 is 50 kbps, and the transmission speed of the mobile body 1 position / altitude information R3 is low. The speed r3 is set to 50 bps. Therefore, the transmission rate ratio r1 / r2 is 1000 times, and the transmission rate ratio r2 / r3 is 1000 times.

  On the other hand, the controller 52 can select, as transmission data, medium transmission speed shooting instruction information + mobile body 2 position / altitude information R4 and low transmission speed mobile body 2 position / altitude information R5. Here, the transmission rate r4 of the imaging instruction information + the moving body 2 position / altitude information R4 is set to 50 kbps, and the transmission speed r5 of the moving body 2 position / altitude information R5 having a low transmission rate is set to 50 bps. Furthermore, the antenna gains of the directional antenna 46 and the directional antenna 54 are 30 dBi, respectively, and the antenna gains of the omnidirectional antenna 47 and the omnidirectional antenna 55 are 0 dBi, respectively. Therefore, the antenna gain ratio between the directional antennas 46 and 54 and the omnidirectional antennas 47 and 55 is 1000 times.

  At this time, the transmission distance D1 between the mobile body 41 and the mobile body 51 is set to 10 km, and communication of image information + mobile body 1 position / altitude information R1 is performed on the downlink 84 by the directional antenna 46 and the directional antenna 54. When the line is established, the transmission rate ratio r4 / r1 is 1/1000 in order to establish the communication line of the imaging instruction information + the mobile unit 2 position / altitude information R4 as the uplink 83 at the same transmission distance D1 at the same time. Therefore, since the antenna gain G can be set to 1/1000 from the equation (1), transmission by the omnidirectional antenna 55 can be selected in the uplink 83.

In this case, high-speed image information + moving body 1 position / altitude information R1 is transmitted on the downlink 84 from the moving body 41 to the moving body 51, and the uplink 83 from the moving body 51 to the moving body 41 is transmitted. As shown in FIG. 7, in order to transmit the medium transmission speed shooting instruction information + the moving body 2 position / altitude information R4, the moving switch 41 is set to the circulator 87 side and the matrix switch 86 is connected in a straight connection as shown in FIG. Thus, the directional antenna 46 can be selected for both transmission and reception of the uplink 83 and the downlink 84. On the other hand, as shown in FIG. 7, the mobile unit 51 selects the omnidirectional antenna 55 when transmitting the uplink 83 by setting the changeover switch 88 on the matrix switch 89 side and the matrix switch 89 in a straight connection. In addition, the directional antenna 54 can be selected when the downlink 84 is received.

  Further, the image information + the mobile body 1 position / altitude information R1 is transmitted on the downlink 84, but when the uplink 83 is a communication line of the mobile body 2 position / altitude information R5 having a low transmission speed, the transmission speed ratio Since r5 / r1 is 1 / million (= 50 bps / 50 Mbps), the antenna gain G can be set to 1 / million from the equation (1), so that reception by the omnidirectional antenna 47 can be selected. it can.

  In this case, as shown in FIG. 8, in the moving body 41, the selector switch 85 is on the matrix switch 86 side, and the matrix switch 86 is cross-connected, so that the directional antenna is transmitted during the downlink 84 as in FIG. 46, but the omnidirectional antenna 47 can be selected when the uplink 83 is received. In addition, as shown in FIG. 8, the mobile unit 51 selects the omnidirectional antenna 55 at the time of transmission of the uplink 83 by setting the changeover switch 88 on the matrix switch 89 side and the matrix switch 89 in a straight connection. In addition, the directional antenna 54 can be selected when the downlink 84 is received.

  In the mobile communication device of this embodiment that can be configured in this manner, the uplink 83 can use the omnidirectional antennas 47 and 55 that are covered by the entire circumference, so that the lock-off is performed. The communication line can be reduced.

  For example, during communication in the state of FIG. 7, since communication is performed between the directional antennas 46 and 54 in the downlink 84, the antenna directivity direction control may not be performed correctly for some reason, and may be locked off. . In that case, the lock-off is recognized by the receiving unit in the transmitter / receiver 53 of the mobile unit 51 which receives the image information of the high transmission speed + the mobile unit 1 position / altitude information R1 on the downlink 84, and the controller By transmitting lock-off information indicating that 52 is locked off in the information in the uplink 83, the controller 44 of the mobile unit 41 recognizes that it is in the lock-off state. At the same time, the mobile unit 51 cannot receive the image information + the mobile unit 1 position / altitude information R1 from the mobile unit 41 when the downlink 84 is in the lock-off state. Therefore, switching to reception by the omnidirectional antenna 55 is performed.

  On the other hand, the controller 44 of the mobile unit 41 that has received the lock-off information by the uplink 83 and has recognized the lock-off state communicates with the uplink 83 and can recognize the position of the mobile unit 51. The directivity direction of the directional antenna 46 is directed toward the moving body 51. Further, as shown in FIG. 9, in the mobile unit 41, the controller 44 switches the information transmitted on the downlink 84 to the mobile unit 1 position / altitude information R <b> 2 at the medium transmission speed, thereby comparing with the state of FIG. 7. Since the transmission rate ratio r1 / r2 is 1/1000, the mobile line 51 is switched to the omnidirectional antenna 55 to establish a communication line.

  In this case, as shown in FIG. 9, in the moving body 41, the changeover switch 85 is on the circulator 87 side and the matrix switch 86 is connected in a straight connection, so that both when receiving the uplink 83 and when transmitting the downlink 84 Although the same state as that in FIG. 7 in which the directional antenna 46 is selected, in the moving body 51, as shown in FIG. 9, the changeover switch 88 is set to the circulator 90 side, and the matrix switch 89 is cross-connected, so that the uplink Both 83 and downlink 84 are switched to select omnidirectional antenna 55.

  When the controller 52 recognizes that the downlink 84 has recovered in the state of FIG. 9, the controller 52 includes information indicating that the downlink has recovered in the information in the uplink 83 and transmits the information. Let the controller 44 of the body 41 recognize that the downlink 84 has recovered. In addition, the controller 52 switches the reception antenna of the downlink 84 from the omnidirectional antenna 55 to the directional antenna 54. On the other hand, the controller 44 orients the directivity direction of the directional antenna 46 toward the directional antenna 54. As a result, the original state of FIG. 7 is restored.

  In FIG. 7, in the uplink 83 that transmits the shooting instruction information at the medium transmission speed + the moving body 2 position / altitude information R4, the transmitting side uses the omnidirectional antenna 55 and the receiving side uses the directional antenna 46. Not limited to this, the transmitting side may use the directional antenna 54 and the receiving side may use the omnidirectional antenna 47, or the transmitting side may use the directional antenna 54 and the receiving side may use the directional antenna 46. However, if a directional antenna is used for both transmission and reception, the antenna coverage of the directional antenna is narrow, so it is necessary to control the antenna direction, and if for some reason the antenna direction control cannot be performed correctly, it may be locked off. There is sex. Therefore, in order to reduce the risk of lock-off due to the coverage limit, it is desirable to select the omnidirectional antenna on either the transmission side or the reception side.

  The present invention is not limited to the above embodiment. For example, the transmission rate and the type and number of information to be transmitted can be other than the above embodiment. Of course.

It is a block diagram of one embodiment of the mobile communication device of the present invention. It is FIG. (1) explaining the switch switching operation | movement of this invention. It is FIG. (2) explaining the switch switching operation | movement of this invention. It is FIG. (3) explaining the switch switching operation | movement of this invention. It is FIG. (4) explaining the switch switching operation | movement of this invention. It is a block diagram of a mobile communication system provided with Example 1 of the mobile communication device of the present invention. FIG. 7 is a diagram (part 1) illustrating a switch switching operation in the mobile communication system of FIG. FIG. 7 is a diagram (No. 2) for explaining the switch switching operation in the mobile communication system of FIG. 6. FIG. 7 is a diagram (No. 3) for explaining the switch switching operation in the mobile communication system of FIG. 6. It is a block diagram of an example of the conventional mobile communication apparatus.

Explanation of symbols

1, 44, 52, 56, 72 Controller 2 Communication control unit 3 Predetermined information such as image data 4 Self-position / altitude / attitude information 5 Opposite station position / altitude information 6 Antenna pointing direction control unit 7 Decoder 8 Encoder 9 Switching control Unit 10, 31, 45, 53, 57, 73 transceiver 11 receiving unit 12 transmission unit 13, 32, 85, 88 changeover switch 14, 86, 89 matrix switch 15, 87, 90 circulator 16, 46, 54, 58, 74 Directional antenna 17, 47, 55, 59, 75 Omnidirectional antenna 18 Transmission data 19 Reception data 20 Reception information 21, 34 Opposite station 48, 60 GPS receiver 49, 61 Altimeter 50, 62 INS terminal 40 Image information 42 Camera 43 Camera directivity direction controller 41, 51 Moving body 71 Fixed station 76 Shooting instruction information 7 Image information 81 and 83 uplink and 84 downlink

Claims (8)

A mobile communication device having a directional antenna and an omnidirectional antenna, and performing transmission or reception by selecting the directional antenna and the omnidirectional antenna,
Wherein one of the directional antenna and the omnidirectional antenna and a transmitting antenna, or One, respectively used simultaneously or the directional antenna and the transmitting antenna and receiving one of said omnidirectional antenna and the other as a receiving antenna An antenna selection means shared as an antenna;
And orientation control means for controlling on the basis of the positional information of the opposite station in the received signal the directivity direction of the directional antenna,
Transmission information generating means for generating transmission information including at least position information indicating the presence position of the own apparatus and transmitting the transmission information using the directional antenna selected by the antenna selecting means or the omnidirectional antenna. A mobile communication device. Lock-off detection means for detecting that the directional antenna is locked off; and, when the lock-off is detected, control the antenna selection means to use the omnidirectional antenna instead of the directional antenna. First antenna switching control means,
A lock-off state transmitting means for transmitting lock-off information indicating that the device is in the lock-off state to the opposite station using the omni-directional antenna when the lock-off is detected; The mobile communication device according to claim 1.   Transmission information switching means for switching and transmitting second transmission information having a transmission rate slower than that of the first transmission information transmitted by the directional antenna used as a transmission antenna when the lock-off information is received; The mobile communication device according to claim 2, further comprising: Return detection means for detecting that the own device has returned from the lock-off state;
The second antenna switching control means for controlling the antenna selection means so as to use the directional antenna instead of the omnidirectional antenna at the time of return detection. Mobile communication device. The antenna selection means includes
A first terminal connected to the directional antenna; a second terminal connected to the omnidirectional antenna; the first terminal and the third terminal; Straight connection between terminals and between the second terminal and the fourth terminal, or between the first terminal and the fourth terminal, and between the second terminal and the third terminal A matrix switch that is in a cross-connected state,
Said third and fourth terminals of the matrix switch, of claims 1 to 4, characterized in that it has a changeover switch means for switching and connecting between an output terminal of the input terminal and a transmitter of the receiver The mobile communication device according to any one of claims.   The antenna selecting means includes the directional antenna and the omnidirectional antenna according to transmission output, antenna gains of the directional antenna and the omnidirectional antenna, a transmission distance to the opposite station, and a transmission speed of transmission data. The mobile communication device according to claim 1, wherein the mobile communication device is selected as a transmission antenna or a reception antenna.   The antenna selection means includes
  When the transmission power and the transmission distance are constant, the directional antenna is used as a transmission antenna or a reception antenna at the time of data transmission at a high transmission rate that is equal to or higher than a preset first data capacity, and is less than the first data capacity. And a first means for selecting an antenna so that the omnidirectional antenna is used as a transmission antenna or a reception antenna at the time of data transmission at a low transmission rate equal to or lower than a second data capacity set in advance. The mobile communication device according to claim 6.   The antenna selection means includes
  When the transmission output and the transmission speed are constant, the directional antenna is used as a transmission antenna or a reception antenna during long-distance data transmission that is equal to or greater than a preset first transmission distance, and less than the first transmission distance. And a second means for performing antenna selection so that the omni-directional antenna is used as a transmission antenna or a reception antenna during short-distance data transmission equal to or less than a preset second transmission distance. The mobile communication device according to claim 6.

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