JP2001022982A - On-vehicle radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system which does not require of an expensive coaxial cable as a control line for connecting an antenna part and main body part for the on-vehicle radio equipment on a half-duplex communication system, where neither parts are connected. SOLUTION: In the on-vehicle radio equipment for performing data communication related to a toll with roadside radio equipment 8, an antenna part 1 where an antenna 2 for communication and a data transmitting/receiving part 3 are integrated and a main body part 4 are separated, and both the parts are connected by a control signal line 7 where three signal lines for transmission, reception and power supply are collected into one. Thus, since no expensive coaxial cable or connector is required and an amplifier is not required for correcting power attenuated by the coaxial cable, the component cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic toll collection system for performing predetermined communication between a roadside apparatus installed on the ground and a vehicle-mounted wireless apparatus. And an in-vehicle wireless device connected by a cable.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional in-vehicle radio apparatus in which an antenna section 22 for performing radio communication with a roadside radio apparatus 21 is separated from a main body section 25. The antenna unit 22 includes a communication antenna 23, and performs communication with the roadside apparatus 21. The antenna section 22 and the main body section 25 are coaxial cables 24 in a microwave band.
Connected by The main unit 25 is a data transmitting / receiving unit
26, a communication control unit 27, a power supply unit 28, and an antenna unit 22
A data transmission / reception unit 26 of the main unit 25 uses a vehicle-mounted battery as a power source and generates a power supply voltage for operating the vehicle-mounted wireless device to transmit and receive data related to the travel toll between the vehicle and the roadside apparatus 21. Is controlled by a communication control unit 27 that receives power supply from the communication control unit 27.

[0003] As described above, even in the above-described conventional vehicle-mounted wireless device with separate antenna unit, the antenna unit via the coaxial cable 24 is used.
It is possible to transmit and receive data related to the travel fare to and from the roadside apparatus 21 by a transmission / reception data signal between the 22 and the main body 25.

[0004]

However, in the above-mentioned conventional on-vehicle radio apparatus in which the antenna section is separated, since it is a radio apparatus using a microwave band, an expensive coaxial cable and an expensive coaxial connector with little attenuation are used. Is required, and an amplifier for correcting the power attenuated by the coaxial cable is required.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and is intended to integrate a communication antenna of a vehicle-mounted wireless device and a data transmitting / receiving unit into an antenna unit to perform data communication with a roadside wireless device. An object of the present invention is to provide an in-vehicle wireless device that controls an antenna unit with a necessary control signal and uses a transmission / reception data signal line and a power supply line for supplying power to the antenna unit among the control signals.

[0006]

According to the present invention, there is provided an on-vehicle radio apparatus comprising: a communication antenna for transmitting and receiving microwaves; an antenna having a data transmitting and receiving unit for modulating and demodulating the microwave; A roadside radio provided on a toll road, comprising: a main body having a communication control section for giving permission for reception and a power supply section; and connection means for transmitting and receiving an intermediate frequency signal between the antenna means and the main body. It has a configuration characterized by transmitting and receiving information related to the traffic of the vehicle to and from the device. This configuration eliminates the need for expensive coaxial cables and connectors and the need for an amplifier for correcting the power attenuated by the coaxial cable, thereby reducing component costs.

Further, in the vehicle-mounted radio apparatus according to the present invention, the connection means performs transmission, reception and power supply of an intermediate frequency signal between the antenna means and the main body through one control signal line. It has a configuration to be. With this configuration, the control signal lines can be simplified, and the handling can be simplified.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an automatic toll collection system according to an embodiment of the present invention. The in-vehicle wireless device has a communication antenna 2 for transmitting and receiving microwaves and a data transmitting and receiving unit 3 for modulating and demodulating microwaves. A main unit 4 having an antenna unit 1, a communication control unit 5 for giving permission for transmission and reception to the antenna unit 1, and a power supply unit 6
And a control signal line 7 which is a connection means for transmitting and receiving an intermediate frequency signal between the antenna unit 1 and the main unit 4.

This in-vehicle wireless device performs wireless data communication with a roadside device 8 having a communication antenna 9. The power supply unit 6 of the main body unit 4 generates a power supply voltage for operating the vehicle-mounted wireless device using the vehicle-mounted battery as a power supply,
By supplying power from the power supply unit 6 to the data transmission / reception unit 3 via the communication control unit 5 and the control signal line 7, a half-duplex communication method is used with the roadside apparatus 8 via the antenna unit 1. Enable data communication.

FIG. 2 shows the configuration of the antenna unit 1 in detail. The antenna unit 1 extracts power from a communication antenna 2, a data reception unit 10, a data transmission unit 11, a local oscillator 12, a transmission / reception switch 13, an internal power supply unit 14, and a transmission / reception data signal line composed of an inductor and a capacitor. A filter 15 is provided. The control signal line 7 connecting the antenna unit 1 and the main unit 4 includes a control signal line 7c for controlling the local oscillator 12 and the like, a transmission control line for transmission, a reception control line for reception, and a power line for supplying to the power supply unit 14. The control signal line 7a that is shared and the control signal line 7b that switches between transmission and reception are combined into one.

Next, the operation of the on-vehicle radio apparatus having the configuration shown in FIG. 2 will be described. When receiving, the roadside apparatus 8
From the communication antenna 2 and receives a signal from the
A signal that has been frequency-converted by the local oscillator 10 and the local oscillator 12 is input to a transmission / reception switch 13, and a control signal for setting a reception state from the communication control unit 5 is transmitted and received via a control signal line 7 b for switching between transmission and reception. 13 is set to receive, the received data is input to the communication control unit 21 via the control signal line 7a, and a predetermined process is performed. At this time,
The data transmission unit 11 is controlled by the communication control unit 5 so that it does not operate. On the other hand, at the time of transmission, a signal for controlling the transmission / reception switch 13 from the communication control unit 5 is transmitted to the control signal line 7b.
And the transmission / reception switch 13 is set on the transmission side. Data related to transmission from the communication control unit 5 is input to the transmission / reception switch 13 via the control signal line 7a, and transmitted via the data transmission unit 11. The signal is transmitted from the communication antenna 2 to the roadside apparatus 8. At this time, the communication control unit 5 controls the communication control unit 5 so that the reception system processing is not performed and the data reception unit 10 of the antenna unit 1 does not operate. The power supply unit 6 of the main body unit 4 that uses a vehicle-mounted battery as a power source and generates a power supply voltage for operating the vehicle-mounted wireless device operates the communication control unit 5 and transmits the antenna via the communication control unit 5 and the control signal line 7a. Power is supplied to the antenna unit 1 and the supplied power is filtered by the filter 15 in the antenna unit 1.
And input to the power supply unit 14 inside the antenna unit 1, and power is supplied to each circuit of the antenna unit 1. Local oscillator 12
A control signal for setting the above is input to the antenna unit 1 via the control signal line 7c.

As described above, the antenna-separated on-vehicle wireless device according to the present embodiment can also transmit and receive data relating to the traveling toll to and from the roadside wireless device 8. Even if the power supply line and the power supply line are combined into one line, it is possible to correctly communicate with the roadside apparatus 8.

[0013]

According to the present invention, as is apparent from the above embodiment, the antenna means for integrating the communication antenna and the data transmission / reception section of the on-vehicle radio apparatus, and the main body having the communication control section and the power supply section, Since connection is made by connection means such as control signal lines and the transmission / reception data signal line of the control signal and the power supply line to the antenna section are shared, an expensive coaxial cable and connector in the microwave band are not required. In addition, by using a common power supply line for transmitting and receiving data and an antenna unit, the number of signal lines connecting the antenna unit and the main body can be reduced, thereby realizing an inexpensive and lightweight in-vehicle wireless device. Can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of an automatic toll collection system according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an in-vehicle wireless device according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a conventional in-vehicle wireless device with a separated antenna unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna part 2 Communication antenna 3 Data transmission / reception part 4 Main body part 5 Communication control part 6 Power supply part 7 Control signal line 8 Roadside apparatus 9 Communication antenna 10 Data reception part 11 Data transmission part 12 Local oscillator 13 Switch 14 Power supply part 15 filter

Claims (2)

[Claims] 1. An antenna unit having a communication antenna for transmitting and receiving microwaves and a data transmitting and receiving unit for modulating and demodulating the microwaves, a communication control unit for giving permission for transmission and reception to the antenna unit, and a power supply unit. And a connection means for transmitting and receiving an intermediate frequency signal between the antenna means and the main body, and information relating to the traffic of the vehicle between a roadside wireless device provided on a toll road. An in-vehicle wireless device using a half-duplex communication method for transmitting and receiving. 2. The on-vehicle vehicle according to claim 1, wherein the connection means performs transmission, reception, and power supply of an intermediate frequency signal between the antenna means and the main body through one control signal line. Wireless device.