JPH09307476A - Wireless card communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a stable communication with a wireless card of a train to be communicated by excluding the influence of unnecessary reflected waves from the body of the train without communicating the wireless card of a train not to be communicated traveling on the remote adjacent line of the train to be communicated. SOLUTION: The antenna main beam 5 of a road equipment is formed, and when the wireless card 1 attached to the train 3 to be communicated passes through within this antenna main beam 5, the road equipment reads information stored in the wireless card 1. In this case, since the antenna main beam 5 faces obliquely upward or downward, the information stored in the wireless card 1 attached to the train 4 not to be communicated traveling on the remote adjacent line is not read.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless card communication device that receives predetermined information stored in a wireless card attached to a mobile body by a road device by radio waves and retrieves it.

[0002]

2. Description of the Related Art FIG. 7 is a diagram showing an example of the configuration of a conventional wireless card communication device, and here, an example in which a train is applied to a moving body is used. In the figure, 1 is a wireless card that transmits a radio wave that is modulated based on information stored inside when receiving a radio wave, and 2 is a radio card that receives the radio wave transmitted from this wireless card 1 and is stored in the wireless card 1. A roadside device for taking out information from the train 3 is a train to be communicated with the wireless card 1 attached, 4 is a non-communication train with a wireless card 1 traveling on a far line adjacent to the train 3 to be communicated, 5 is inside the roadside device 2 Is the main beam of the on-road device transmitting antenna and the on-road device receiving antenna.

FIG. 8 (a) is a diagram showing the configuration of the on-road device 2, 6 is a radio wave source for generating radio waves, 7 is a road device transmitting antenna for transmitting the radio waves generated by the radio wave source 6 to the wireless card 1, Reference numeral 8 is a roadside device receiving antenna that receives the radio wave transmitted from the wireless card 1, 9 is a demodulation unit that demodulates a received signal of the roadside device receiving antenna 8, and 10 is a demodulation unit 9
It is a decoder that reads the information stored in the wireless card 1 from the signal demodulated in (1). FIG. 8B is a diagram showing the configuration of the wireless card 1, and 11 is the roadside device 2.
A wireless card receiving antenna for receiving the radio waves transmitted from the wireless card receiving antenna 12, a power-on circuit 12 for detecting that the radio waves received by the wireless card receiving antenna 11 are above a predetermined level, and starting the operation of the wireless card 1.
A data storage unit 13 stores predetermined data and sends the data in accordance with an instruction from the power-on circuit 12, 14
Is a modulator that modulates the radio wave received by the wireless card receiving antenna 11 based on the data stored in the data storage unit 13, and 15 is a wireless card transmitting antenna that transmits the modulated signal from the modulator 14 to the roadside device 2. Is.

Next, the operation will be described with reference to FIGS. 7 and 8. The radio wave generated by the radio wave source 6 in the roadside device 2 in FIG. 8A is transmitted to the wireless card 1 from the roadside device transmitting antenna 7 in the roadside device 2. The radio waves transmitted to the wireless card 1 form the antenna main beam 5 shown in FIG. 7, and when the wireless card 1 attached to the communication target train 3 enters the range of the antenna main beam 5, communication is performed. I do. The wireless card 1 is shown in FIG.
When the radio wave transmitted from the roadside device 2 is received by the wireless card receiving antenna 11 and the received signal of the wireless card receiving antenna 11 becomes equal to or higher than a predetermined level, the power-on circuit 12 operates as shown in (b). . The wireless card, which has started to operate by the power-on circuit 12, modulates the signal received by the wireless card receiving antenna 11 by the modulator 14 based on the information stored in the data memory 13.

The modulated signal of the modulator 14 is transmitted to the roadside device 2 by the wireless card transmission antenna 15. This modulated signal is received by the on-road device receiving antenna 8 of FIG.
The demodulation unit 9 demodulates the reception signal of the on-road device receiving antenna 8, and the decoder 10 reads the information stored in the wireless card 1 from the demodulation signal. Trains that pass can be identified using this information, and operation management and warehousing management are performed.

[0006]

As shown in FIG. 7, in the conventional wireless card communication device, the main beams of the on-road device transmitting antenna and the on-road device receiving antenna are directly facing the wireless card. There was also the possibility of communicating with a wireless card installed in a non-communication train running on a distant adjacent line. In addition, the radio waves radiated from the on-road device have an adverse effect such as unstable communication because the unnecessary reflected waves reflected by the train body other than the radio waves transmitted from the wireless card are also received by the on-road device. Was there.

The present invention has been made to solve the above problems, and does not communicate with a wireless card of a non-communication target train running on an adjacent line far from the communication target train, An object of the present invention is to obtain a wireless card communication device capable of stable communication with a wireless card of a train to be communicated by eliminating the influence of unnecessary reflected waves from a vehicle body or the like.

[0008]

According to a first aspect of the present invention, there is provided a wireless card communication device, wherein an on-road device transmitting antenna and an on-road device receiving antenna are array antennas, and each antenna element is provided with a predetermined phase difference. The antenna main beam is tilted obliquely upward or downward.

In the wireless card communication device according to the second aspect of the present invention, the on-road device transmitting antenna is configured with a linear polarization of 45 degrees, and the on-road device receiving antenna is 45 degrees orthogonal to the polarization direction of the on-road device transmitting antenna. It is composed of linearly polarized waves.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. 1 is a block diagram of a wireless card communication apparatus showing Embodiment 1 of the present invention, and 16 is a roadside apparatus having a tilt antenna. FIG. 2A is a diagram showing the configuration of the on-road device 16 having a tilt antenna, in which 17 is a tilt transmitting antenna and 18 is a tilt receiving antenna.
FIG. 2B is a configuration diagram of the wireless card 1, and FIG.
Same as (b). Further, FIG. 3 is an example of the configuration of the tilt antenna for forming the antenna main beam shown in FIG. In the figure, 19 is a patch element A, 20 is a patch element B, 21 is a patch element C, 22 is a patch element D, and 23 is a radio wave feeding point.

Next, the operation will be described. In FIG. 2, the radio wave generated by the radio wave source 6 is the tilt transmission antenna 17
Power is supplied to The electric waves fed to the tilt transmitting antenna 17 and the tilt receiving antenna 18 are fed at the feeding point 2 in FIG.
The distance from 3 to the patch element A19 is the longest, and the distance from the patch element D22 is the shortest. Therefore, a predetermined phase difference is given to the four patch elements, and the radiated radio wave forms a main beam tilted upward. As shown in FIG. 1, the wireless card 1 attached to the communication target train 3 communicates with the on-road device 16 having the tilt antenna because it passes through the main beam, but travels on the adjacent line far from the communication target train 3. Since the wireless card 1 attached to the non-communication train 4 does not pass through the main beam, it does not communicate with the ground device 16 having a tilt antenna. The electric wave transmitted from the wireless card 1 attached to the train 3 to be communicated is transmitted by the tilt receiving antenna 1 in the roadside device 16.
Received at 8. The subsequent operation is similar to that of the conventional technique.

Embodiment 2. 4 is a block diagram of a wireless card communication device showing Embodiment 2 of the present invention.
Reference numeral 24 is a roadside device having a 45-degree linear polarization antenna.
FIG. 5A shows a road device 2 having a 45-degree linear polarization antenna.
In the figure showing the configuration of 4, a reference numeral 25 is a 45-degree linear polarization transmitting antenna, and a reference numeral 26 is a 45-degree linear polarization receiving antenna. FIG.
8B is a configuration diagram of the wireless card, which is similar to FIG. 8B. In addition, FIG. 6 is an example of the configuration of a 45-degree linearly polarized antenna. In the figure, 27 is a transmitting patch element E, 28 is a receiving patch element F, and the arrow indicates the direction of polarization.

Next, the operation will be described. In FIG. 5, the radio wave generated by the radio wave source 6 is fed to the 45-degree linearly polarized wave transmission antenna 25. 45 degree linearly polarized wave transmitting antenna 2
In FIG. 6, the electric wave fed to 5 is patch element E27.
Is emitted at and becomes polarized in the direction of the arrow. In FIG. 4, although communication is performed with a component in the same direction as the polarized wave of the wireless card 1 of the train 3 to be communicated, the unnecessary reflected wave reflected by the train body or the like does not change its polarization direction and is polarized by 45 degrees. It returns with the same 45-degree linear polarization as the polarization direction of the radio wave transmitted from the transmission antenna 25. Therefore, the unnecessary reflected waves reflected by the receiving patch element F28 and the train car body are not received because their polarizations are orthogonal to each other. The radio wave transmitted from the wireless card of the train 3 to be communicated is received by the 45-degree linear polarization receiving antenna 26. The subsequent operation is similar to that of the conventional technique.

[0014]

According to the first aspect of the invention, since the main beam of the antenna of the on-road device is tilted obliquely upward or downward, it does not communicate with a non-communication train traveling on a distant adjacent line. , Stable communication with the target train.

According to the second aspect of the invention, since the polarization of the transmitting antenna of the roadside device and the polarization of the receiving antenna of the road device are orthogonal to each other, the communication target can be achieved without receiving unnecessary reflected radio waves from the train body. Stable communication with trains is possible.

In the above description, the communication device with the wireless card attached to the train has been described as an example.
The present invention is also applicable to the case where the moving object to be communicated is a traveling vehicle on the road, and can be applied to traffic management at a toll gate on a toll road.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a wireless card communication device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a roadside device and a wireless card according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a tilt antenna according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram of a wireless card communication device according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a roadside device and a wireless card according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram of a 45-degree linearly polarized wave antenna according to a second embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional wireless card communication device.

FIG. 8 is a configuration diagram of a conventional road device and a wireless card.

[Explanation of symbols]

1 wireless card, 2 roadside equipment, 3 trains subject to communication, 4 trains not subject to communication, 5 antenna main beam, 6
Radio wave source, 7 Roadside device transmitting antenna, 8 Roadside device receiving antenna, 9 Demodulator, 10 Decoder, 11 Wireless card receiving antenna, 12 Power-on circuit, 13
Data storage unit, 14 modulation unit, 15 wireless card transmission antenna, 16 road device with tilt antenna,
17 tilt transmitting antenna, 18 tilt receiving antenna, 19 patch element A, 20 patch element B, 21
Patch element C, 22 Patch element D, 23 Feed point, 2
On-the-road equipment with 445 degree linear polarization antenna, 25 45
Degree linearly polarized wave transmitting antenna, 26 45 degree linearly polarized wave receiving antenna, 27 patch element E, 28 patch element F.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04B 7/26 H04B 7/26 G

Claims (2)

[Claims] 1. A wireless card attached to a mobile body, which transmits radio waves modulated based on information stored therein when receiving radio waves from the road, a radio wave source installed on the road to generate radio waves, A roadside device transmitting antenna that transmits the radio wave generated from this radio source to the wireless card, a roadside device receiving antenna that receives the radio wave modulated by the wireless card, and a roadway that demodulates the reception modulation signal of this roadside device receiving antenna. In a wireless card communication device including a device demodulator and a road device decoder that reads information stored in the wireless card from the demodulated signal of the demodulator, the main beams of the road device transmitting antenna and the receiving antenna are obliquely arranged. A wireless card communication device, which is tilted upward or downward. 2. A wireless card attached to a mobile body, which transmits radio waves modulated based on information stored therein when receiving radio waves from the road, a radio wave source installed on the road to generate radio waves, A roadside device transmitting antenna that transmits the radio wave generated from this radio source to the wireless card, a roadside device receiving antenna that receives the radio wave modulated by the wireless card, and a roadway that demodulates the reception modulation signal of this roadside device receiving antenna. In a wireless card communication device including a device demodulator and a road device decoder that reads information stored in the wireless card from a demodulated signal of the demodulator, a polarization plane of the road device transmitting antenna and a road device receiving antenna The wireless card communication device is characterized in that the polarization plane of has a deviation of a certain angle anomaly.