JP2003104203A - Train monitoring device and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a transmitter inconspicuous to passengers by reducing the number of the transmitter provided in a train monitor device for monitoring a departure with the operation by one-man by transmitting images of a side surface of a platform at a train side thereof to an operation board monitor provided adjacent to the operation board till the train goes through the platform. SOLUTION: Several television cameras 1 and 2 provided in the platform 4 pick up images of passengers of the train 11, and the transmitter 9 transmits the image signal thereof to train side receiver means 12, 17 and 18 through the radio communication to display the images in a monitor 13 inside of the train. The train is provided with several receiver means, and the several receiver means receive the transmission electric wave from one transmitter, and compare the intensity of the received electric wave with each other, and the receiver receiving the electric wave having the highest intensity is automatically selected to display the image in the monitor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention captures images of passengers in a train and the vicinity of an entrance / exit of a train with a plurality of TV cameras installed on a platform, and transmits the video signal from a transmitter to a receiver in a train by radio waves. The present invention relates to a train monitoring device and method that transmits a train until it has passed through the platform, grasps and confirms the status of passengers with a monitor installed in the train, and enables safe entrainment of the train.

[0002]

2. Description of the Related Art FIG. 12 shows, for example, JP-A-9-226584.
FIG. 1 is a diagram showing a conventional device disclosed in Japanese Patent Publication No. JP-A-2003-101, in which 101 is a vehicle-side monitoring camera, 103 is a front monitoring camera that monitors the front of a train, and 105 and 106 are displayed on one cab monitor 113. Screen synthesizer that synthesizes as possible,
Reference numerals 107 and 108 denote modulators for modulating the video signals synthesized by the screen synthesizers 105 and 106.
Reference numerals 9 and 110 denote transmitters for transmitting the video signals modulated by the modulators 107 and 108 to the vehicle 111, and 112.
Is a receiving device installed on the vehicle, 114 is an on-board device for detecting the position of a train, and 115 is a video switching device for switching video.

The on-board surveillance cameras 1 and 2 are for photographing the side surface and the door of a train at a platform. If the train is long or the platform is curved, two vehicle-side surveillance cameras are required, so two are provided here.

The front monitoring camera 103 captures an image of a portion of the track along the platform of the station. When the platform is curved, one front monitoring camera 103 is not enough, and therefore a plurality of front monitoring cameras 103 are provided.

The screen synthesizers 105 and 106 are for synthesizing images taken by a plurality of surveillance cameras so that they can be displayed on one monitor.

The modulators 107 and 108 are the screen synthesizer 10.
5 and 106 are for modulating the video signal after being combined.

The transmitters 109 and 110 include modulator 10
This is for transmitting the video signal modulated by 7, 108 to the vehicle 111. A radio wave such as a millimeter wave is used as the transmission medium. Therefore, the transmitters 109 and 110 are composed of transmitters and transmitting antennas.

The on-board equipment includes a receiving device 112, a driver's cab monitor 103, an on-board device 114 for detecting the position of a train, and an image switching device 115.

The receiving device 112 includes transmitting devices 109 and 11
It receives the signal sent by 0. The receiving device 112 is configured to start / stop the reception and change the receiving frequency according to an instruction from the video switching device 115. The receiving devices are provided in front of and behind the vehicle 111, respectively. The receiving device 112 includes a receiver and a receiving antenna.

The cab monitor 113 includes a transmitter 109,
It is for displaying the image sent from 110. The driver can confirm the safety by looking at the image displayed on the cab monitor 113. Cab monitor 113
Are provided in front of and behind the vehicle 111, and can display a composite of images taken by a plurality of cameras 101 and 103.

The onboard train position detection device 14 detects the position of the train. The on-board train position detection device 14 outputs the detection result to the video switching device 15.

The image switching device 15 starts image reception based on a signal from the on-board device 14 for detecting the position of the train.
The switching and reception stop instructions are output to the receiving device 12. The video switching device 15 has a preset schedule. It may be stipulated that the display of the train side image is started when the train is stopped, and the display is ended when the train end passes through the platform. The video switching device 15 collates the on-rail position input from the on-rail train position detection on-board device 14 with this schedule,
Whether to display on the cab monitor 13 and the type to be displayed are determined. Then, the receiving device 1 receives a signal indicating the content of the determination.
It is designed to output to 2.

In FIG. 13, when a train arrives at a point (point A) where a forward monitoring image is required, the onboard train position detection onboard device 14 transmits the on-rail position information to the video switching device 15. Then, the video switching device 15 causes the receiving device 12 to start capturing the front monitoring video. As a result, a front monitoring image is displayed on the cab monitor 13.

After that, when the train passes a point (point B) where the forward monitoring video is unnecessary, the train on-board position detecting on-board device 14 transmits the on-rail information to the video switching device 15. Then, the video switching device 15 stops the reception device 12 from capturing the front monitoring video, so that the front monitoring information is not displayed on the cab monitor 13.

When the train arrives at a point (point C) where the vehicle-side monitoring image is required, the train on-board position detecting on-board device 14 transmits the on-rail position information to the video switching device 15. Then,
The video switching device 15 causes the receiving device 12 to start capturing the front monitoring video. As a result, the vehicle-side surveillance image is displayed on the cab monitor 13.

After that, when the train passes a point (point D) where the car-side monitoring image is unnecessary, the on-rail train position detection onboard device 14 transmits the on-rail position information to the video switching device 15. Then, the video switching device 15 causes the receiving device 12 to stop capturing the vehicle-side monitoring video. As a result, the vehicle side monitoring information is not displayed on the cab monitor 13. In this case, point D is the point where the last part of the train has left the platform.

[0017]

In the conventional moving body monitoring apparatus, there is no description about the restriction condition of installation when the millimeter wave of the transmitting apparatus and the receiving apparatus for transmitting to the moving body is used as a radio wave. No consideration is given to the effect of fading from the ground when millimeter waves are used as radio waves.

Further, no study has been made on reducing the number of transmitters and receivers installed when millimeter waves are used as radio waves.

Further, when a train route such as Ciesass is suddenly changed, and when radio waves are transmitted from the front of the train to a receiver installed in the driver seat in front of the train, the front of the train is responded to in response to the sudden change of the route. There was a problem in that the number of transmitters installed in the machine had to be increased.

Further, there is a problem that the transmitter has to have a transmitter shape that satisfies the constraint condition of the building limit, and the manufacturing constraint in manufacturing the transmitter is large.

Further, since the transmitters are conspicuous because a plurality of transmitters are installed independently, there is a problem that passengers may be concerned about the adverse effects on the human body due to the radio wave radiation of the transmitters and may be regarded as a problem. It was

Further, in the case of performing one-man monitoring, when the data received from the rear portion of the vehicle is transmitted to the frontmost portion of the vehicle where the driver is present through the wiring inside the vehicle, the received image may be disturbed by noise due to EMI or the like. There were some problems.

The present invention has been made in order to solve the above problems, and is to prevent the transmitter from being conspicuous while being unaffected by fading from the ground or the like during departure monitoring. Another object of the present invention is to provide a train monitoring device and method in which the number of transmitting devices, which may cause a passenger to have a bad influence on the human body from the receiving device, is reduced.

[0024]

A train monitoring device according to the present invention captures images of train passengers and the like with a plurality of TV cameras installed on a platform, and the video signals are transmitted from a transmission device to a train by radio waves. In the one that transmits to the receiving means on the side and displays the image on the monitor inside the train, the antenna part of the transmitting device is arranged near the ground and it is transmitted to the receiving means on the train side with an upward radio beam. is there.

Further, the main body portion of the transmitter and the antenna portion are separated, the main body portion is buried in the ground, and the antenna portion is exposed on the ground.

Further, by forming the cross section of the transmitting device antenna part in a trapezoidal shape and providing flat antennas on both oblique sides of the trapezoid, it is possible to radiate a beam-shaped radio wave in both directions of the antenna part and to radiate the radio wave. Direction (Direction direction)
In which the transmitting device antenna section is arranged along the train connecting direction.

Further, the receiving means is provided with a diversity function.

Further, a plurality of TV cameras installed on the platform capture images of train passengers and passengers, and the image signals are transmitted from the transmitter to the receiving means on the train side by radio waves to transmit the images on the train. In what is displayed on the monitor,
A plurality of receiving means is provided on the train side, the radio waves transmitted from one transmitting device are received by the plurality of receiving means, the received radio wave intensities are compared, and the one having a high intensity is automatically switched to display an image on a monitor. It was done like this.

Further, it is provided with an image switching device having a function (screen squelch function) of controlling the receiving means by using the speed detection signal from the automatic train operation device and limiting the display on the monitor only when necessary. .

Further, a plurality of TV cameras installed on the platform capture images of train passengers and passengers, and the image signals are transmitted from the transmitting device to the receiving means on the train side by radio waves, and the images are displayed on the train. In what is displayed on the monitor,
The transmitter antenna is installed on the outside surface (side surface of the track) of the automatic platform fence that opens and closes in conjunction with the vehicle door, which is installed on the platform to prevent passengers from getting inside. The transmitter main body is installed on the far side).

Further, the transmitting device antenna section is a flat antenna.

Further, a plurality of TV cameras installed on the platform capture images of train passengers and passengers, and the image signals are transmitted from the transmission device to the receiving means on the train side by radio waves, and the images are displayed on the train. In the method of displaying on a monitor and monitoring trains, a receiving means is provided in the rearmost vehicle and a transmitting device is provided at the rear of the platform, and an image signal is transmitted from the transmitting device to the receiving device of the rearmost vehicle. .

Further, a plurality of TV cameras installed on the platform capture images of train passengers and passengers, and the image signals are transmitted from the transmission device to the receiving means on the train side by radio waves, and the images are displayed on the train. In the method of displaying on a monitor and monitoring trains, a receiving device is provided on the rearmost vehicle and the frontmost vehicle, and a radio wave signal received by the receiving means of the rearmost vehicle is transmitted to the receiving means of the frontmost vehicle by a millimeter wave (60 GHz band). Transmitted by
This is displayed on the monitor of the front vehicle.

[0034]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiment 1 of the present invention will be described below with reference to FIG. 1 is a block diagram showing the configuration of Embodiment 1 of the present invention, where H is the platform side and T is the vehicle side. 1 is a vehicle-side monitoring camera that is installed according to the length of the vehicle to check the entry / exit status. 2 is a vehicle-side monitoring camera that monitors the platform on the side of the vehicle at the time of departure (hereinafter referred to as departure monitoring camera). , 9
Is a transmission device that transmits the signals from the cameras to the train side.

On the vehicle side, 11 is a vehicle and 12 is a vehicle.
Is a receiving device which is a receiving means including an antenna and the like, 17 is a receiving device antenna section, 18 is a receiving device main body section, which cooperates with the receiving device antenna section 17 to constitute a receiving means having the same function as the receiving device 12. . 13 is a cab monitor that displays a signal from the receiving device as an image, 28 is an ATO device that outputs a speed detection signal of the vehicle 11, 30 is a vehicle side monitoring by a speed detection signal from an automatic train operation device (ATO device) 28 This is a video switching device that switches the signals of the camera and the departure monitoring camera 2, switches the video of the receiving device 12 and the receiving device main body 18, and supplies the selected video signal to the monitor 13.

FIG. 2 shows the arrangement of the above-mentioned parts and other structures related thereto. In FIG. 2, a plurality of vehicle side monitoring cameras 1 and departure monitoring cameras 2 are arranged along the platform 4 at appropriate intervals. The vehicle 11 includes a leading vehicle 11a, an intermediate vehicle 11b, and a rear vehicle 11c, and a four-car train is shown in the figure. The receiving device 12 is provided in the leading vehicle 11a, and the receiving device antenna unit 1 is provided.
7 and the receiver main body 18 are provided one by one on the outer side surface of each vehicle except the leading vehicle. Receiver main body 18
The receiver 12 is connected to the video switching device 30. The transmitter 9 is installed at a position where the antenna beam effective range 29 covers one or more of the receiver 12 or the receiver antenna unit 17.

The transmitter 9 is installed on the ground beside the line 26, and the detailed structure thereof is shown in FIG. In FIG. 3, 9a is a transmission device main body, 9b is a transmission antenna part having a trapezoidal cross section, 9c is a planar antenna provided on both oblique sides of the trapezoid, and 9d is a radiation fin provided on the transmission device main body 9a. . The planar antenna 9c is shown in FIG.
As shown in FIG. 2, for example, two transmission antenna units are arranged side by side in the horizontal direction. As an example of installation of the transmitter 9,
Next to the line 26, the transmitting antenna portion 9b and the radiation fin 9d
The transmitter main body 9a is buried in the ground so that is exposed to the ground.

The side view of the positional relationship between the vehicle 11 and the transmitter 9 is as shown in FIG. 2 (b). Reference numeral 29 denotes an antenna beam effective range indicating an effective range of the radio wave from the transmitting antenna unit 9b. The antenna beam effective range 29 radiates an upward radio wave beam from the ground to the receiving device 12 and the receiving device antenna section 17.

First, the overall system will be described with reference to FIGS. Multiple vehicle-side surveillance cameras 1 on platform 4
The departure monitoring camera 2 is installed, and the door portion and the side surface portion of the vehicle 11 are photographed. When the train is long, one camera cannot sufficiently monitor, so two vehicle-side monitoring cameras 1 and two departure monitoring cameras 2 are provided here.

The video image captured by the camera 1 is transmitted to the transmitter 9 as an NTSC image signal using a cable. This image signal is modulated by the transmitter 9 and is effectively radiated into space as a radio signal in the millimeter wave band (44 GHz band). The video of each vehicle-side monitoring camera 1 is modulated on a wireless carrier wave having a different frequency and transmitted from a plane antenna 9c attached to a transmitting antenna unit 9b of a transmitting device 9.

The transmitted radio waves are received by the antenna built in the receiving device 12 installed beside the driver's table of the leading vehicle 11a. The receiving device 12 reproduces an image signal from the received millimeter-wave radio wave and outputs the image signal to the driver's cab monitor 13 installed near the driver's cab according to an instruction from the video switching device 30. The power supply for the cab monitor 13 is turned on by an instruction from the video switching device 30.

A speed detection signal is supplied from the ATO device 28 of the vehicle 11 to the video switching device 30 for the purpose of displaying only an image when the vehicle is stopped. In the receiving device 12,
Based on this signal, the image and power of the vehicle side monitoring camera 1 are supplied to the driver's cab monitor 13 only when necessary to realize the screen squelch function.

Next, the vehicle 11 starts and the platform 4
I will explain the departure monitoring until I finish. Vehicle 11
From the time of departure, the video switching device 30 switches to the departure monitoring camera 2 based on the speed detection signal of the ATO device 28,
Try to show the image near the side door of the vehicle. The departure monitoring camera 2 uses an imaging lens with a narrow angle of view, and
1 and necessary parts of the platform 4 can be taken.

The image taken by the departure monitoring camera 2 is transmitted to the transmitter 9 as an image signal of the NTSC system by using a cable like the image of the vehicle side monitoring camera 1. In the transmitting device 9, the image of the departure monitoring camera 2 is modulated on a wireless carrier (when the number of departure monitoring cameras is two or more, the images of the departure monitoring cameras 2 have different frequencies), and the transmitting device 9
Is effectively radiated into space as a radio signal in the millimeter wave band (44 GHz band) from the plane antenna 9c attached to the transmitter antenna section 9b. Regarding the frequency, the frequency used in the vehicle-side monitoring camera 1 may be used.

The transmitted radio waves are received by an antenna built in the receiving device 12 installed beside the driver's table of the leading vehicle 11a or the receiving device antenna section 17 provided in the intermediate vehicle 11b and the rear vehicle 11c, The received millimeter-wave radio waves are reproduced as an image signal, and based on the speed detection signal of the ATO device 28, an image is output to the cab monitor 13 installed near the cab. The power supply for the cab monitor 13 is turned on by an instruction from the video switching device 30.

Due to the radio wave propagation distance, the transmitter 9 can transmit the effective radio wave to the receiver only when the receiver 12 or the receiver antenna section 17 is within the antenna beam effective range 29. At least one of the receiving device 12 and the receiving device antenna unit 17 must enter the antenna beam effective range 29 in order to keep the received image continuous on the cab monitor 13. Millimeter wave radio waves received from the receiving device 12 or the receiving device antenna unit 17 are converted into video signals.

The video switching device 30 compares the received power from the receiving device 12 or the receiving device main body 18 and switches to a video signal having a higher received power, and transmits the video signal to the cab monitor 13 to reproduce an image. To do so. The video switching device 30 performs both the operation of switching between the vehicle-side monitoring camera 1 and the departure monitoring camera 2 based on the speed detection signal of the ATO device 28, and the operation of comparing the received power and switching to the received signal with the larger received power. I am in charge.

When the vehicle further moves forward, the receiving device antenna portion 17 attached to the intermediate vehicle 11b and the receiving device antenna portion 17 attached to the rear vehicle 11c enter the antenna beam effective range 29 at the same time and are received by these. The millimeter wave is converted into a video signal by the receiver main body 18, and the received power is compared by the video switching device 30 to switch to a video signal with a large received power. The switched video signal is transmitted to the cab monitor 13 and an image is reproduced. As a result, the driver can monitor the train image without interruption until the train passes through the platform 4.

The ATO device 28 measures the average speed at the time when the vehicle exits the platform, and a detection signal (contact signal) is sent from the ATO device 28 until the speed reaches that speed.
2. It is possible to continuously supply to the receiver main body 18, and based on this signal, the image and power are supplied to the video switching device 30 until the train passes through the platform 4, and the screen squelch function is realized. To do.

Therefore, the driver can view the image of the vehicle-side monitoring camera 1 until the vehicle departs and the image of the departure monitoring camera 2 after the vehicle departs, without performing any operation by himself. Safety monitoring can be performed.

By the way, in the transmitter 9, the transmitter main body 9a is buried in the ground, and the antenna shape is a flat antenna whose antenna beam angle is narrower than that of the pyramidal horn antenna. A device that is less likely to be restricted can be realized. In the vicinity of the ground, there are less dimensional restrictions on the building limit than in the vicinity of the side surface of the vehicle 11. Further, as shown in FIG. 3B, the antenna portions are arranged in the width direction to lower the ground height so as to make the shape inconspicuous.

By installing the transmitting antenna section 9b near the ground, the arrangement is such that effective radio waves are transmitted to the receiving device 12 on the vehicle from below (see FIG. 2 (b)). It is possible to realize a system that is not affected by fading due to the reflected wave 27 from the ground.

Regarding the departure monitoring, the train monitoring can be performed with the minimum number of transmitting devices by providing the transmitting device at the rear part of the platform and the receiving device at the rear vehicle.

For example, as shown in FIG.
When the receiving device antenna section 17 is not provided on the side surface of the vehicle, it is always necessary to effectively radiate the transmission radio wave from the front of the vehicle to the receiving device 12 of the vehicle 11. Therefore, it is necessary to install a plurality of transmitters 9, 24, 25 in view of the reach of the effective radio waves of millimeter waves.

Further, as shown in FIG. 5 (b), the line 26 is abruptly changed, such as a sea suspension (where the line is abruptly bent).
If it is necessary to change the transmission line, it is necessary to install a plurality of transmission devices 9, 24, 25 in response to changes in the line.

On the other hand, as shown in FIGS. 6 (a), 6 (b) and 6 (c), the image of the departure monitoring camera 2 is displayed from the transmitter 10 installed at the rear of the platform 4 in the rearmost vehicle 11.
By transmitting effective radio waves to the receiving device 12 installed in c, it is possible to monitor with the minimum number of transmitting devices until the train has passed through the platform 4 regardless of the presence or absence of the receiving device antenna portion on the side of the vehicle.

When the millimeter wave (44 GHz band) is used for the transmission radio wave, the plane antenna can narrow the antenna beam angle smaller than the pyramidal horn antenna, and the effective radio wave can reach a long distance of about 40 m to 150 m. The length of 120 m of the platform 4 can be covered with one transmitter, and the influence of fading due to the reflected wave 27 from the surroundings can be reduced. Therefore, one platform can be covered by one transmitter.

Therefore, regardless of whether the line 26 shown in FIGS. 6 (a), 6 (b) and 6 (c) is a straight line, or in the case of the sheath suspension shown in FIGS. 6 (d) and 6 (e), the transmission installed at the rear part of the platform 4 is performed. By transmitting effective radio waves from the device 10 to the receiving device 12 installed in the rearmost vehicle 11c of the image of departure monitoring, it is possible to reduce the number of required installing transmitting devices.

If the transmitting antenna beam angle is too narrow,
Since it becomes difficult to align the transmitter 9 and the receiver 12 as in the case of using light, it is necessary to set the optimum beam angle in consideration of both installation work and the influence of fading.

When the platform 4 is curved, a plurality of transmitters 10 are installed along the platform in addition to the transmitter 10 at the rearmost part of the platform 4. The radio waves received by the receiving device 12 are compared in intensity by the video switching device 30, and the video signal having a high radio wave intensity is switched.

Since the track of the platform 4 does not change abruptly like the cable suspension of the track 26, the number of transmitters to be installed can be reduced as compared with the case where the departure monitoring image is transmitted only from the front of the vehicle 11. It is possible to reduce the case where the passenger is concerned that the radio wave radiation of the device adversely affects the human body and the radio wave is regarded as a problem.

The received radio waves obtained from the receiving device 12 of the rear vehicle 11c are transmitted from the in-vehicle transmitting device (60 GHz band) 43 installed on the ceiling of the rear vehicle as shown in FIG. The signal is received by the in-vehicle receiving device (60 GHz band) 44 installed on the ceiling of the vehicle 11a. The device can be made smaller by using millimeter-wave radio waves in the 60 GHz band with a small antenna beam angle, and pinpoint images that are less susceptible to fading on the upper surface of the vehicle with many restrictions such as power supply lines and protrusions of air conditioners Transmission can be realized.

In the case of image transmission in the 60 GHz band, if the platform 4 is curved, the in-vehicle receiving device 4
The receiving antenna of 4 has an automatic tracking function so that the direction of the receiving antenna changes in the direction of large received power.
To enable stable reception of radio waves. The received radio wave is reproduced as a video signal by the in-vehicle receiving device 44 and output to the cab monitor 13 so that departure monitoring can be performed until the train passes through the platform 4.

Embodiment 2. In the first embodiment, the transmitter 9 is separated into the transmitter antenna section 9b and the transmitter body section 9a. However, as shown in FIG. 7, the transmitter antenna section 9b and the transmitter body section are shown. 9a may have an integral shape. The heat is dissipated by cooling using the heat dissipating fins 9d and the heat pipes 35, and the transmitter main body 9a hermetically seals the millimeter wave part 32, the IF module 33 that performs modulation, and the power supply part 34 that supplies electric power to each part, and waterproofs them. With the structure, the device can be made compact and the environment resistance can be taken into consideration.

Embodiment 3. In the first embodiment,
Although the transmitter 9 is separately installed in the transmitter antenna unit 9b and the transmitter main unit 9a, in the third embodiment, the transmitter 9 shown in FIG.
As shown in FIG. 5, the transmission device is installed on the automatic platform fence 46 installed on the platform 4 in order to prevent the passengers from being caught up in conjunction with the entrance door of the vehicle 11. In this case, the transmitter main body 9a is attached to the front side surface of the fence 46, and the transmitter antenna section 9b is attached to the outside surface of the fence 46. The installation space is only about 200 mm on the outside (vehicle side) of the fence 46 due to the construction limit, but the transmitter antenna 9
By separating b from the transmitter main body 9a, the transmitter antenna 9b can be designed compactly and the transmitter can be installed so as not to be noticeable to passengers.

Fourth Embodiment In the first embodiment,
Although the transmitting direction of the transmitting device antenna unit 9b is set to one direction opposite to the traveling direction of the train, as shown in FIG. 9, the transmitting device 9 such that the transmitted radio waves cover the plurality of receiving device antenna units 17 is used for traveling. A millimeter wave radio wave may be transmitted in both directions, and the signal of the receiving device main body 18 having the highest received radio wave intensity may be automatically switched by the video switching device 30 to display the video on the cab monitor 13. .
In this case, an antenna having directivity in both directions is used as the transmitter antenna section, as shown in FIG.

Embodiment 5. In the fourth embodiment,
The video received from each receiving device is wired to the video switching device 30 by a cable. However, as shown in FIG. 10, the video signal from the receiving device 18 is converted into a digital signal to be used for the LCD of the LCD 38. By transmitting the signal as a digital signal through the cable 39, a dedicated cable for connecting the vehicles is omitted, and the cable is shared with the LCD cable for sending news and the like in the vehicle, so that the wiring in the vehicle is not affected by noise due to EMI. It is possible to realize a simplified device. By providing the fence 37 on the platform 4, it is possible to send an image in which the confusing movement of the person within the white line is easily discriminated in the image of the departure monitoring camera, so that safer monitoring can be performed.

Sixth Embodiment Millimeter wave radio wave (44 GHz
In the band), as shown in FIG. 11, focusing on the fact that the effect of fading greatly changes if the distance between the receiving antennas deviates by 50 mm, a plurality of receiving antennas 40 are provided in the receiving device to provide a diversity function. By using it, the receiving device main body 18 can output the data of the receiving antenna with the strong received radio wave intensity, and a system that is less susceptible to fading can be obtained.

Embodiment 7. Although the transmitter main body 9a is buried in the ground in the first embodiment, the transmitter main body 9a may be installed near the ground in a place where there are few restrictions on the building limit near the ground.

[0070]

As described above, according to the present invention, since the antenna section of the transmitter is installed on the ground, the main body of the transmitter can be installed in an inconspicuous place, such as in the ground, which is not easily restricted by the construction limit. At the same time, it is possible to eliminate the influence of fading due to the reflected wave from the ground.

Further, the transmitting device antenna portion is formed in a trapezoidal cross section, and flat antennas are provided on both hypotenuses of the trapezoid so as to radiate a beam-like radio wave in both directions of the antenna portion, and the radiation direction of the radio wave. By arranging the antenna unit along the train connecting direction, it is possible to cover a wide transmission range with one transmitting device and reduce the number of transmitting devices.

Further, by using the receiving means of the diversity system, it is possible to avoid the influence of fading.

Further, the radio wave transmitted from one transmitting device is received by a plurality of receiving means, the received radio wave intensities are compared, and the one having a high intensity is automatically switched to display the image on the monitor. A stable monitor image can be obtained with the minimum number of transmitters.

Further, the receiving means is controlled by using the speed detection signal from the ATO device to realize the screen squelch function of the monitor, so that the driver's operation can be saved and the passengers can be monitored more safely.

Further, an automatic platform fence which is opened and closed in conjunction with the vehicle door is installed on the platform in order to prevent passengers from being caught, and the antenna part of the transmitter is provided on the outer surface (side surface of the track) of the automatic platform fence and the transmitter. By installing the main body on the inner side of the above-mentioned automatic platform fence (the side far from the track), the transmitter can be installed inconspicuously, and the psychological burden on passengers concerned about the adverse effect of radio wave radiation on the human body can be reduced. .

Further, since the antenna section is a plane antenna, the antenna beam angle can be narrowed down and the effective radio wave reach can be increased, so that the platform can be covered by the minimum number of transmitters.

Further, by providing the receiving means in the rearmost vehicle and the transmitting device in the rear part of the platform, and transmitting the image signal from the transmitting device to the receiving means in the rearmost vehicle, the train can be operated by the minimum number of transmitting devices. It is possible to monitor until it has passed through.

Further, the rearmost vehicle and the frontmost vehicle are provided with receiving means, and the radio waves received by the receiving means of the rearmost vehicle are transmitted to the receiving device of the frontmost vehicle in the millimeter wave (60 GHz band),
Since the information is displayed on the monitor of the front-most vehicle, wiring inside the vehicle is not required and the device can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing a train monitoring device according to a first embodiment of the present invention.

2A and 2B show an arrangement of train monitoring devices according to Embodiment 1 of the present invention, FIG. 2A being a plan view and FIG. 2B being a side view.

3A and 3B show a transmitter in Embodiment 1 of the present invention, FIG. 3A is a side view of the transmitter, and FIG. 3B is a perspective view of an antenna unit.

FIG. 4 is a diagram for explaining the operation of the train monitoring device according to the first embodiment of the present invention.

FIG. 5 is a diagram for explaining the train monitoring method according to the first embodiment of the present invention, in which (a) is a straight line,
FIG. 6B is a plan view showing a case of Ciesas.

FIG. 6 is a diagram for explaining the train monitoring method according to the first embodiment of the present invention, in which (a), (b) and (c) show a straight line, and (d) and (e) show a case of Cesars. It is a top view shown.

FIG. 7 is a schematic side view showing an integrated transmitter according to a second embodiment of the present invention.

8A and 8B are diagrams showing an installed state of a transmitter according to a third embodiment of the present invention, FIG. 8A is a plan view, and FIG. 8B is a perspective view of a main part.

FIG. 9 is a layout diagram of a train monitoring device according to a fourth embodiment of the present invention.

FIG. 10 is a layout diagram of a train monitoring device according to a fifth embodiment of the present invention.

FIG. 11 is a schematic line plan view showing a receiving device according to a sixth embodiment of the present invention.

FIG. 12 is a diagram showing a conventional train monitoring system.

FIG. 13 is a diagram showing a conventional train monitoring system.

[Explanation of symbols]

1 vehicle side monitoring camera, 2 departure monitoring camera, 4 platform, 9 transmitter, 9a transmitter main body, 9b transmitter antenna section, 9c plane antenna, 9
d Heat dissipation fin, 10 transmitter,
11 vehicle, 11a front vehicle, 11
b Intermediate vehicle, 11c Rear vehicle,
12 receiver, 13 cab monitor
17 receiving device antenna part, 18 receiving device body part,
24 transmitters, 25 transmitters,
26 tracks, 27 reflected waves,
28 ATO device, 29 effective range of antenna beam, 30 video switching device, 31 radiating fin,
32 millimeter wave part (for transmission), 33 IF module (for transmission), 34 power supply part, 35 heat pipe, 36 cable, 37 fence, 38 LCD, 39 LCD cable, 40 receiving antenna, 41 millimeter wave part (for receiving) ), 42 IF module (for receiving), 43 transmitter (60 GHz band), 44 receiver (60 GHz band), 46 automatic home fence.

Claims (10)

[Claims] 1. A plurality of TV cameras installed on the platform capture images of train passengers and passengers, and the image signals are transmitted from the transmitter to the train-side receiving means by radio waves, and the images are displayed on the train. A train monitoring device for displaying on a monitor, characterized in that an antenna part of a transmitting device is arranged near the ground, and an upward radio wave beam is transmitted to receiving means on the train side. 2. The train monitoring device according to claim 1, wherein the main body portion and the antenna portion of the transmitting device are separated, the main body portion is buried in the ground, and the antenna portion is exposed above the ground. 3. The transmitting device antenna section is formed in a trapezoidal shape in cross section, and flat antennas are provided on both hypotenuses of the trapezoid so that a beam-shaped radio wave can be radiated in both directions of the antenna section. Radial direction (Direction direction)
The train monitoring device according to claim 1 or 2, wherein the transmitting device antenna unit is arranged so as to extend along the train connecting direction. 4. The train monitoring device according to claim 1, wherein the receiving means has a diversity function. 5. An image of a train passenger, etc. is taken by a plurality of TV cameras installed on the platform, and the image signal is transmitted from a transmitting device to the receiving means on the train side by radio waves, and the image is displayed inside the train. In the train monitoring device displayed on the monitor, a plurality of receiving means is provided on the train side, the radio waves transmitted from one transmitting device are received by the plurality of receiving means, and the received radio field intensities are compared. A train monitoring device characterized by automatically switching and displaying an image on a monitor. 6. A video switching device having a function (screen squelch function) of limiting the display of the monitor only when necessary by controlling the receiving means using the speed detection signal from the automatic train operation device. The train monitoring device according to claim 5. 7. An image of train passengers, etc. is captured by a plurality of TV cameras installed on the platform, and the image signal is transmitted from a transmission device to the receiving means on the train side by radio waves, and the image is displayed on the train. In the train monitoring device displayed on the monitor, the transmitter antenna part is installed on the outer surface (track side surface) of the automatic platform fence that is provided to prevent passengers from being caught in the platform and that opens and closes in conjunction with the vehicle door. The train monitoring device is characterized in that the transmitter main unit is installed on the inner side of the automatic platform fence (the side far from the track). 8. The train monitoring device according to claim 1, wherein the transmitting device antenna section is a flat antenna. 9. An image of a train passenger, etc. is taken by a plurality of TV cameras installed on the platform, and the image signal is transmitted from a transmitting device to the receiving means on the train side by radio waves, and the image is displayed on the train. In the train monitoring method of displaying on a monitor for train monitoring, the receiving means is provided in the rearmost vehicle and the transmitting device is provided at the rear of the platform, and the image signal is transmitted from the transmitting device to the receiving device of the rearmost vehicle. Train monitoring method characterized by. 10. An image of a train passenger, etc. is captured by a plurality of TV cameras installed on the platform, and the image signal is transmitted from a transmission device to the receiving means on the train side by radio waves, and the image is displayed on the train. In a train monitoring method of displaying on a monitor to monitor a train, a receiving device is provided on the rearmost vehicle and the frontmost vehicle, and a radio wave signal received by the receiving means of the rearmost vehicle is transmitted to the receiving means of the frontmost vehicle by a millimeter wave (60 GHz). The train monitoring method is characterized in that it is transmitted in the band) and is displayed on the monitor of the frontmost vehicle.