JP2002264811A - Platform monitor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a conventional platform monitor system in a station that a radio communication section is formed over several ten meters because a transmitter is provided in front or rear of a train to transmit a signal to a receiver provided in a cab, that an antenna dimension is increased, that a reflected wave and phasing have an influence and that a radio communication license is necessary. SOLUTION: A transmitter device 1 to be provided on the platform 4 and the receiver device 2 to be loaded on the train are provided to correspond to each other within a surface nearly vertical in the progressing direction of the train 3. With this structure, the platform monitor system capable of reducing the radio communication section to several ten cm, capable of reducing the antenna dimension, capable of restricting the influence of the reflected wave and phasing, and capable of eliminating an application for a license by using the fine electric wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a platform monitoring system in a railway system, in which an image signal of a station platform is wirelessly transmitted to a train stopped at the platform, so that the status of the platform can be confirmed by image in the train. It is about.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are diagrams showing an outline of a conventional platform monitoring system. 4 and 5, reference numeral 1 denotes a transmitting device having an antenna (not shown);
Is a receiving device having an antenna not shown, 3 is a train, 4
Is a platform, 5 is a communication cable, 6 is a transmitter 1
A surveillance camera connected to the communication cable 5 and monitoring the platform 4.
Is a monitor device that is connected to the camera and receives images from the monitoring camera 6 via wireless communication and displays the images. By configuring as described above, the platform monitoring system in the railway transmits the image signal of the platform to the receiving device installed in the train via radio, and displays the image signal received by the receiving device on the monitor device. Thus, the monitoring video of the platform can be grasped in the train.

[0003] In the above-described conventional apparatus, when trains of the same train stop at a station, the stop position of the train is constant, and the receiving device 2 installed in the train is also at the same position. As shown in FIG. 5, when the train 3 stops at the station, an image signal of the monitoring camera 6 that captures an image of the platform 4 is transmitted to the transmission device 1 via the communication cable 5.
The signal transmitted in the transmitting device 1 is converted into a radio signal and transmitted to the receiving device 2 on the train 3. The receiving device 2 converts the wireless signal into a normal image signal, and the monitor device 7 reflects the status of the platform.

At this time, in the conventional device, as shown in FIG. 4, the transmitting device 1 is installed several tens meters ahead or behind the position of the receiver when the train stops, so that the transmission distance by radio becomes longer. There was a problem.

[0005]

As described above, according to the conventional method, the distance of wireless transmission becomes long to several tens of meters, and in order to secure stable wireless transmission quality, it is necessary to (1) radiate from the transmitting device. Effective radiated power must be increased. (2) It is necessary to increase the antenna gain to increase the effective radiation power. In that case, the antenna cannot be installed when the distance between the train and the platform is small because the antenna size becomes large. (3) Since transmission is not possible with weak radio waves, a license application for wireless use is required. (4) It is easily affected by fading due to reflected waves.
Therefore, it is difficult to adjust the antenna installation angles of the transmission device and the reception device during installation work. (5) It is easily affected by weather such as rainfall and snowfall. There were problems such as.

The platform monitoring system according to the present invention has been made in order to solve the above-mentioned problems, and a transmitting device is installed in a direction perpendicular to the traveling direction of a train, and a wireless transmission distance is set. Is shortened to secure stable wireless transmission quality even when the radio wave is weak.

[0007]

A platform surveillance system according to the present invention is mounted on a train, a surveillance camera installed on a platform of a station, a transmission device for converting an image of the surveillance camera into a radio signal and transmitting the signal, and a train. A platform monitoring system including a receiving device that receives a wireless signal transmitted from the transmitting device, and a monitor that receives a signal from the receiving device and displays an image of the platform, wherein the transmitting device is configured to transmit the signal of the train. It is installed so as to transmit radio waves from one direction in a plane perpendicular to the traveling direction to the train, and the receiving device receives radio waves coming from one direction in a plane substantially perpendicular to the traveling direction of the train. The transmitting device and the receiving device are installed so as to face each other when the train stops.

[0008] The transmitting device is installed so as to transmit radio waves from the side of the train. Further, the transmission device is installed so as to transmit a radio wave from above or below the train.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows an outline of a platform monitoring system according to Embodiment 1 of the present invention. The device configuration is the same as that of the conventional example, and the same components as those of the conventional example are denoted by the same reference numerals. As shown in the figure, the antenna of the transmitting device 1 is installed on the platform 4 so as to radiate radio waves to the side surface of the train 3, and the antenna of the receiving device 2 is arranged to receive the radio waves of the transmitting device 1. Installed near. Since the stop position of the train is fixed, the antenna of the transmitting device 1 and the receiving device 2
Antenna positions.

At this time, the interval between the transmitting device and the receiving device is
(The distance between the outer wall of the train and the transmitting device) + (the distance between the outer wall of the train and the receiving device). (The distance between the train outer wall and the transmitter)
Is tens of meters to prevent the train from touching the ground equipment
m, and (the distance between the outer wall of the train and the receiving device) is a number c
m. After all, the interval between the transmitting device and the receiving device can be set to several tens of cm, so that the length of the wireless section can be significantly reduced as compared with the conventional example, and the attenuation of radio waves can be reduced. Therefore, even if the magnitude of the radio wave output from the transmitting device is a weak radio wave, wireless transmission is possible, and the antenna gain and size can be reduced. This facilitates installation of the transmission / reception device, and significantly reduces the effects of fading and weather.

[0011] It is to be noted that a train automatic operation device (ATO or the like) is used in the current railway, and the deviation of the train stop position is within several tens of centimeters. There is no problem with transmission and reception even if the wireless device is used in the method.

Further, when trains of different knitting growths enter the same platform, for example, when a receiver is installed near the train driver's seat, the position of the receiver differs depending on the stop position of the train. Would. In such a case, a plurality of transmission devices may be provided corresponding to the type of knitting growth to be input. For example, for a platform into which vehicles of a 4-car train and a 5-car train enter, two transmitters, a transmitter for a 4-car train and a transmitter for a 5-car train, may be installed.

As described above, according to the first embodiment of the present invention, the transmitting device is installed so as to output radio waves from the side in the traveling direction of the train in accordance with the position of the receiving device in the train stopped state. Since the length of the wireless section is set to several tens of cm, communication is possible even if the output of the transmitting device is small, and the transmission power and antenna gain can be reduced, so that the device can be downsized and the restrictions on the installation position can be reduced. Furthermore, since the effects of fading and weather can be significantly reduced, the wireless transmission quality can be stabilized, and the installation angle of the antenna in installation work can be easily adjusted.
Further, since the output from the transmitting device can be performed by a weak radio wave, in that case, a license for a wireless worker is not required, and the specifications of the wireless equipment can be freely selected. Since no license is required, the costs for these license applications,
Time can be reduced, and it is highly effective in reducing the life cycle cost of the system.

Embodiment 2 FIG. FIG. 2 shows an outline of a platform monitoring system according to Embodiment 2 of the present invention.
The same components as those in the first embodiment are denoted by the same reference numerals. In the first embodiment, a transmitting / receiving device is installed in the side direction of the train,
Although communication was performed, in the second embodiment, the antenna of the receiving device 2 was installed facing the upper part of the train 3, and the antenna of the transmitting device 1 was moved from the upper part of the train 3 to the train 3 in accordance with the position when the train was stopped. A transmitting device is installed on a support 8 provided on the platform 4 so as to transmit a radio wave toward the transmitting device. As described above, similarly to the first embodiment, the interval between the transmitting and receiving apparatuses can be set to several tens of cm, and the same effect as the first embodiment can be obtained.

In FIG. 2, the transmitting device is supported by a support 8 installed on the station platform 4.
For example, when there is a canopy or a steel frame capable of supporting the transmission device above the track as station equipment, there is no problem if the equipment is supported by such equipment. In that case, there is no need to install a support because existing equipment is used, which leads to a reduction in installation costs.

Embodiment 3 FIG. 3 shows an outline of a platform monitoring system according to Embodiment 3 of the present invention.
The same components as those in the first embodiment are denoted by the same reference numerals. In the third embodiment, the antenna of the receiving device 2 is installed toward the lower part of the train, and the receiving device 2 is stopped when the train stops.
The transmission device 1 is installed on a track (not shown) toward the train in accordance with the position of. Also in this installation method, since the stop position of the train is fixed, the interval between the transmission and reception devices can be set to several tens of cm, so that the same effect as in the first embodiment of the invention can be obtained.

Further, in the case of the third embodiment, since the transmitting device is installed on the line section, a support for the transmitting device is not required unlike the first and second embodiments, which leads to a reduction in installation cost.

In addition, the same effect can be obtained even if the transmitting device is installed at the lower side of the platform and the radio wave is transmitted obliquely below the train.

[0019]

As described above, the platform monitoring system according to the present invention can be used when the receiving device mounted on the train with the antenna directed to the outer wall and the transmitting device mounted on the platform with the antenna directed to the outer side wall of the train stop the train. By adjusting the position in, the wireless communication section was set to several tens of cm,
The following effects are obtained as compared with the conventional example. (1) The output of the radio wave radiated from the transmitting device can be small. (2) With (1), the antenna dimensions can be reduced,
Easy to install. (3) Even weak radio waves that do not require a license application can be transmitted. (4) Less susceptible to reflected waves and fading. (5) It is hardly affected by the weather such as rainfall and snowfall.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an outline of a platform monitoring system according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an outline of a platform monitoring system according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating an outline of a platform monitoring system according to a third embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a conventional platform monitoring system.

FIG. 5 is a diagram showing an outline of a conventional platform monitoring system.

[Explanation of symbols]

1 transmitting device, 2 receiving device, 3 train, 4
Platform, 5 communication cable, 6 monitoring camera, 7 monitoring device.

Claims (3)

[Claims] 1. A surveillance camera installed on a platform of a station, a transmission device for converting an image of the surveillance camera into a radio signal and transmitting the radio signal, and a reception device mounted on a train and receiving a radio signal transmitted from the transmission device. An apparatus and a platform monitoring system including a monitor that receives a signal from the receiving apparatus and displays an image of the platform, wherein the transmitting apparatus trains the train from one direction in a vertical plane with respect to the traveling direction of the train. The receiving device is installed on the train to receive a radio wave coming from one direction in a plane substantially perpendicular to the traveling direction of the train, and when the train stops, A platform monitoring system, wherein the transmitting device and the receiving device face each other. 2. The platform monitoring system according to claim 1, wherein the transmitting device is installed to transmit a radio wave from a side of the train. 3. The platform monitoring system according to claim 1, wherein the transmitting device is installed so as to transmit a radio wave from above or below the train.