JP3207766B2 - In-vehicle radio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle wireless device mounted on a vehicle that performs wireless communication while traveling with a ground station.

[0002]

2. Description of the Related Art Conventionally, in a toll collection system for a toll road, a toll collector collects cash from a driver at a toll booth,
Alternatively, a method is adopted in which a driver puts cash into an automatic machine to automatically receive a fee. For this reason, the driver had to stop at the toll booth and prepare cash.

On the other hand, as a near-future toll collection system in which cash is not transferred at a toll booth, a fixed station antenna attached to a gantry installed on a road and an on-vehicle radio mounted on a passing vehicle are used. A system for performing accounting processing by wireless communication between them has been developed.

For example, FIG. 3 shows a toll collection system by wireless communication. The fixed station antenna 1 is mounted on a gantry 3 installed on a road 2 so as to correspond to a traveling lane. An in-vehicle wireless device 5 is mounted inside a windshield of a vehicle 4 traveling on the road 2, and information such as an ID number unique to each vehicle is stored.

[0005] The conventional on-vehicle wireless device 5 mounted on the vehicle 4 is configured as shown in FIG. As shown in FIG. 4, a receiving antenna 6 for receiving a radio wave transmitted from the fixed station antenna 1, a receiving amplifier 7 for amplifying a received signal, a demodulator 8 for demodulating the amplified signal, and processing the demodulated signal. A signal processing unit 9, a modulator 10 for modulating transmission data,
Transmission amplifier 11 for amplifying modulated signal, fixed station antenna 1
And a transmission antenna 12 for transmitting communication data.

When a vehicle 4 equipped with a vehicle-mounted radio 5 travels on the road 2 and enters the communication area of the fixed-station antenna 1, a receiving antenna 6 provided on the vehicle-mounted radio 5 is sent from the fixed-station antenna 1. Receives transmitted radio waves. The received signal is amplified by the receiving amplifier 7 and output to the demodulator 8. The demodulator 8 demodulates the amplified signal into a digital signal and outputs the digital signal to the signal processing unit 9.

When data is transmitted from the vehicle 4 to the fixed station antenna 1, the modulator 10 modulates the transmission data such as the ID number and the toll output from the signal processing unit 9, and transmits the modulated data to the transmission amplifier 11. Output. This modulated signal is amplified by the transmission amplifier 11 and transmitted from the transmission antenna 12 to the fixed station antenna 1.

As described above, the on-vehicle wireless device 5 provided in the vehicle 4
By performing wireless communication while traveling between the vehicle and the fixed station antenna 1, it is possible to collect tolls or obtain road information without stopping the vehicle 4 once.

[0009]

In the above-mentioned conventional on-board radio, the in-vehicle radio is installed inside the vehicle, that is, inside the windshield as described above, so that the influence of the windshield is great. In this case, the windshield has a problem that the elevation angle and the material are different depending on the vehicle type, and the communication area is different depending on the vehicle type.
In some cases, transmission of a large amount of data could not be reliably performed. Further, there is a problem that an uncommunicable area is generated in the communication area due to fading due to reflection in the windshield.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to eliminate a change in a communication area due to a difference in a material and a shape of a windshield depending on a vehicle type and to obtain a stable communication area. It is an object of the present invention to provide an in-vehicle wireless device of a wireless toll collection system capable of performing the above-mentioned.

[0011]

According to the present invention, there is provided an on-vehicle wireless device.
In-vehicle wireless communication with the ground station mounted on the vehicle
Wireless communication with the ground station in the line machineTransceiver
And mounted on the vehicle,TransceiverSent and received by
Data processing means for processing communication data;SeparateIngredient
Be preparedAnd the transmitting and receiving unit transmits radio waves from the ground station.
The receiving antenna for receiving and the output of the receiving antenna are increased.
Receiving amplifier to be widened, demodulating the output of the receiving amplifier,
A demodulator for outputting to the data processing means;
A modulator for modulating the output of the
A transmitting amplifier to amplify and an output signal of the transmitting amplifier
A transmitting antenna for transmitting to the ground station;
The modulator and the demodulator of the receiving unit are configured to perform the data processing.
Connected by means and signal linesIt is characterized by the following.

The on-vehicle wireless device according to the present invention has the following operation and effects. When the vehicle passes near the location of the ground station on the road, a transmission radio wave is transmitted from the ground station toward the vehicle. The in-vehicle wireless device attached to the vehicle receives the transmission radio wave by the antenna provided on the license plate,
Output to data processing means. Further, when transmitting communication data from the on-vehicle wireless device to the ground station, the transmission data output from the processing means is transmitted from the antenna provided on the license plate to the ground station.

As described above, according to the in-vehicle wireless device provided with the antenna integrally with the license plate, since there is no shield on the front surface of the antenna, the communication region does not fluctuate due to the influence of the windshield, and a stable wireless communication region is provided. Can be secured.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a wireless toll collection system according to an embodiment of the present invention. As shown in FIG. 1, a fixed station antenna 1 is attached to a gantry 3 installed on a road 2 so as to correspond to a traveling lane. An in-vehicle device 13 is mounted on the inside of a windshield of the vehicle 4 traveling on the road 2, and a license plate is integrally provided with a vehicle-mounted antenna (hereinafter, this license plate is also used as a license plate and mounted on a vehicle). Antenna 14). The license plate / vehicle antenna 14 and the on-vehicle device 13 are connected by a signal line.

The in-vehicle device 13 and the license plate and in-vehicle antenna 14 applied to the above-mentioned wireless toll collection system have a configuration as shown in FIG. As shown in FIG. 2, the license plate / vehicle antenna 14 includes a receiving antenna 6 for receiving a radio wave from the fixed station antenna 1, a receiving amplifier 7 for amplifying the received signal, and converting the amplified signal into a digital signal. A demodulator 8 for demodulating, a modulator 10 for modulating transmission data to be transmitted to the fixed station antenna 1,
A transmission amplifier 11 amplifies the modulated signal, and a transmission antenna 12 for transmitting the amplified signal to the fixed station antenna 1.

The on-vehicle device 13 comprises a signal processing unit 9 for performing signal processing of transmission / reception data. The signal processing unit 9 is connected to a demodulator 8 and a modulator 10 in a license plate / vehicle antenna 14 by signal lines. ing.

The operation of the above embodiment will be described. As shown in FIG. 1, a vehicle 4 travels on a road 2 and a fixed station antenna 1
When the vehicle enters the communication area, the fixed station antenna 1
Transmits a radio wave that modulates the transmission data to This transmission radio wave is received by the receiving antenna 6 in the license plate / vehicle antenna 14 of the vehicle 4 as shown in FIG. The signal received by the receiving antenna 6 is amplified by the receiving amplifier 7 and output to the demodulator 8. This demodulator 8
The received signal is demodulated into a digital signal and output to the signal processing unit 9 in the vehicle-mounted device 13.

The signal processing section 9 outputs transmission data to the modulator 10 in order to transmit information such as an ID number unique to each vehicle and a toll stored in advance to the fixed station antenna 1. I do. The modulator 10 modulates the transmission data and outputs it to the transmission amplifier 11. The transmission amplifier 11 amplifies the modulated signal and transmits it from the transmission antenna 12 to the fixed station antenna 1. Thus, fixed station antenna 1
Wireless communication is performed between the vehicle and the vehicle 4, and a predetermined amount is charged to the vehicle-mounted device 13.

In the above-mentioned transmission / reception operation, the receiving antenna 6 and the transmitting antenna 12 are provided integrally with the license plate.
Variations in the communication area due to differences in the material and shape of the windshield depending on the type of the vehicle 4 are eliminated, and a stable communication area can be secured.

In the above embodiment, the receiving antenna 6 and the transmitting antenna 12 are provided separately, but it goes without saying that the transmitting and receiving may be performed by a single transmitting and receiving antenna.

[0021]

As described above, according to the present invention, by eliminating a shield on the front of the antenna of a vehicle-mounted radio,
Variations in the communication area due to differences in the material and shape of the windshield depending on the vehicle type can be eliminated, and a stable communication area can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration of the on-vehicle wireless device in the embodiment.

FIG. 3 is a diagram showing an overall configuration of a conventional wireless toll collection system.

FIG. 4 is a diagram showing a configuration of a conventional in-vehicle wireless device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed station antenna 2 Road 3 Gantry 4 Vehicle 6 Receiving antenna 7 Receiving amplifier 8 Demodulator 9 Signal processing unit 10 Modulator 11 Transmitting amplifier 12 Transmitting antenna 13 Onboard unit 14 License plate and onboard antenna

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Seiki Kato 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Pref. Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) Reference A) JP-A-7-73350 (JP, A) JP-A-8-185549 (JP, A) JP-A-1-72441 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) G07B 11/00-17/04 G08G 1/09 H04B 7/26

Claims (3)

(57) [Claims] An in-vehicle wireless device for performing wireless communication with a ground station mounted on a vehicle, comprising: a transmitting / receiving unit for performing wireless communication with the ground station; and a transmitting / receiving unit mounted on the vehicle and transmitted / received by the transmitting / receiving unit. will be provided to separate data processing means for processing the communication data, wherein the transceiver unit, the ground station
A receiving antenna for receiving radio waves from the
Receiving amplifier for amplifying the output of the
A demodulator for demodulating the force and outputting to the data processing means;
A modulator for modulating an output of the data processing means;
A transmission amplifier for amplifying the output of the controller;
Consists of a transmitting antenna for transmitting an output signal to the ground station
And the modulator and the demodulator of the transmitting and receiving unit are
An in-vehicle wireless device connected to the data processing means by a signal line . 2. An in-vehicle wireless device for performing wireless communication with a ground station mounted on a vehicle, comprising: a transmitting / receiving unit for performing wireless communication with the ground station; and a transmitting / receiving unit mounted on the vehicle and transmitted / received by the transmitting / receiving unit. Process communication data
And, it was provided by separating a data processing means for charging a fee, and the transmitting and receiving unit, the ground station
A receiving antenna for receiving radio waves from the
Receiving amplifier for amplifying the output of the
A demodulator for demodulating the force and outputting to the data processing means;
A modulator for modulating an output of the data processing means;
A transmission amplifier for amplifying the output of the controller;
Consists of a transmitting antenna for transmitting an output signal to the ground station
And the modulator and the demodulator of the transmitting and receiving unit are
An in-vehicle wireless device connected to the data processing means by a signal line . 3. An in-vehicle wireless device for performing wireless communication with a ground station mounted on a vehicle , wherein the transmitting and receiving unit is provided integrally with a license plate of the vehicle and performs wireless communication with the ground station. Mounted on a vehicle, processes communication data transmitted and received by the transmitting and receiving unit ,
Separating a data processing means for charging a fee, the result was provided in the transceiver unit, the ground station
A receiving antenna for receiving radio waves from the
Receiving amplifier for amplifying the output of the
A demodulator for demodulating the force and outputting to the data processing means;
A modulator for modulating an output of the data processing means;
A transmission amplifier for amplifying the output of the controller;
Consists of a transmitting antenna for transmitting an output signal to the ground station
And the modulator and the demodulator of the transmitting and receiving unit are
An in-vehicle wireless device connected to the data processing means by a signal line .