JP3983556B2 - Train approach warning system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a train approach warning system , which relates to a system for monitoring the position of a train, and more particularly to a train approach warning system suitable for notifying a train approach.
[0002]
[Prior art]
In railway facilities, ensuring safety is a top priority, and maintenance work on tracks, equipment, etc. is therefore essential. Since trains run day and night on the main line, maintenance work must be performed between trains. Conventionally, in order to perform this maintenance work safely, a watchman is arranged in the vicinity of the work place, the approach of the train is detected, and an instruction to evacuate is issued to the worker.
[0003]
[Problems to be solved by the invention]
As described above, in a system that relies on a conventional person, there is a risk that a human error may occur due to a sudden change in train schedule.
[0004]
The object of the present invention is to solve the conventional problems, and it is possible to collectively monitor the position of all trains at a central command station with high accuracy, to reliably detect the approach of a train, and An object of the present invention is to provide a train approach warning system that can reduce the burden on the train and prevent human error.
[0005]
[Means for Solving the Problems]
The present invention comprises a train mounting device, a work location device, and a central command station device, and in a system for monitoring and warning the position of a train traveling on a railroad track, the train mounting device is mounted on a train. The function of measuring the position of the train by GPS, the function of transmitting the measured position data to the central command station device, and the transmission of the measured position data of the train according to the train speed data detected by the speed detector mounted on the train The work location device has a function of changing the cycle , the operator carries the function of measuring the position of the work location by GPS, the function of transmitting the measurement position data to the central command station device, and the central command station device The central command center device receives the train and work location measurement position data transmitted from the train mounting device and work location device. Function of a train approaching warning system having a function of transmitting a train approaching notification to the train and functions and device for working position to determine that a train approaches the working position by measuring the position data of the working position.
[0006]
Further, the present invention provides a function in which the central command center device obtains the corrected position data of the train and work location using the correction information measured by the central command center device for the received train and work location measurement position data. It has a train approach warning system.
[0007]
And this invention is a train approach warning system whose error of the corrected position data of the said train is 2 m or less.
[0008]
Further, according to the present invention, the train mounting apparatus transmits the discrete train measurement position data measured by the GPS and the train speed data detected by the speed detector mounted on the train to the central command station apparatus. The central command station device is a train approach warning system that has a function of continuously obtaining train position data from received train measurement position data and train speed data.
[0011]
Furthermore, this invention is a train approach warning system in which the said work location apparatus displays the warning display from which a kind differs according to the distance between a train position and a work location position.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described. Hereinafter, an embodiment of a train approach warning system of the present invention will be described with reference to FIGS. 1 and 2. Drawing 1 is a system configuration explanatory view of the train approach warning system of an embodiment. Drawing 2 is an explanatory view of an example of a screen display of a portable terminal in a train approach warning system of an embodiment.
[0016]
An embodiment will be described. The train approach warning system of this embodiment includes a central command station device 1, a train mounting device 2, and a work location device 3, which are connected via a communication network 4. The central command station device 1 includes a GPS reference station receiver 11, a DGPS position calculation processing device 12, an operation management system device 13, a train alarm server 14, a router / server 15, and the like. The train mounting device includes a vehicle-mounted antenna 21, a GPS receiver 22, a hybrid position estimation device 23, a wireless modem 24, and the like. The work location device 3 includes a watchman portable terminal 31, a GPS receiver 32, a wireless modem 33, a wireless transmitter 34, a worker alarm 35, and the like. Here, the GPS (Global Positioning System) means that a radio wave transmitted from a positioning artificial satellite (GPS satellite) 5 placed in a circular orbit at a ground altitude of about 20,000 Km is received on the ground by GPS. This is a system that calculates the position of the satellite and the distance between the satellite and the receiver by receiving the signal, so that the absolute position of the GPS receiver can be measured. The current car navigation system (car navigation system) It is widely used for such as.
[0017]
The central command station device 1, the train mounting device 2, and the work site device 3 in the train approach warning system of the embodiment will be described. A GPS receiver 22 that is configured integrally with the GPS antenna is installed on the top of the train 20 (such as a roof). Data from the GPS satellite 5 (train DGPS RAW data) received by the GPS receiver 22 is input to the hybrid position estimation device 23. The hybrid position estimation device 23 also receives a pulse train (speed information) generated according to the rotation of the train wheel 25. In the hybrid position estimation device 23, the pulse train is converted into the train speed, and the time, train number, GPS reception data, train speed information, and the like are transmitted from the in-vehicle antenna 21 through the wireless modem 24 at regular time intervals.
[0018]
This data (time, train number, GPS reception data, train speed information) is sent to the router / server 15 of the central command station device 1 via the communication network 4 and input to the DGPS position calculation processing device 12. DGPS correction information from the GPS electronic reference station antenna 6 obtained by the GPS reference station receiver 11 is also input to the DGPS position calculation processing device 12. The DGPS position calculation processing device 12 obtains the position of the train with high accuracy (for example, accuracy of 2 m or less) from the GPS reception data from the train mounting device 2 and the DGPS correction information. The obtained train position, time, train number, and train speed are input to the train warning server 14.
[0019]
When the DGPS correction information is provided by another means (FM broadcasting, satellite broadcasting, etc.), if a receiving device for receiving such information is provided, the GPS electronic reference station antenna 6 and the GPS reference station use are provided. The receiver 11 is not necessary.
[0020]
The train alarm server 14 is input with the train number, train station-to-station line information (information about which station and between stations), diagram information, etc., from the existing operation management system device 13, and the DGPS position More reliable train position information is generated by collating with the train position from the calculation processing device 12. As will be described later, the train warning server 14 is input with position information of a work location where the worker is working. Only train information within a radius of 5 km centered on the position of each work location is sent as a train approach notification to the portable terminal 31 at each work location via the router / server 15 and the communication network 4.
[0021]
A portable terminal 31 held by a watchman at each work location incorporates a GPS antenna and receiver 32 for detecting the position of the portable terminal 31 and a wireless modem 33 for transmitting and receiving data.
[0022]
With this GPS receiver 32, the position data of the GPS satellite 5 for the work location is obtained and sent from the wireless modem 33 to the central command station apparatus 1 via the communication network 4. Only information on trains within a radius of 5 km is sent to the portable terminal 31 based on this work position data. The portable terminal 31 estimates the position of each train at the current time based on the train number, time, train position, and train speed sent.
[0023]
Since the GPS time is synchronized with very high accuracy (error 5 ns), it may be considered that the time in the central command station device 1, the train mounting device 2, and the work site device 3 are synchronized. Therefore, if the train position at a certain time can be detected, even if there is a transmission time delay in the communication system and the time changes, if there is a difference between the current time and the train position detection time and train speed information, the train position at the current time Can be estimated with high accuracy. Trains have high inertia and train speeds do not change significantly in a few seconds.
[0024]
When it is detected that the train has approached a predetermined distance (for example, 1000 m, 2500 m, etc.) from this train position, an alarm sound is sounded by the alarm device 35 held by the operator via the wireless transmitter 34. Moreover, as shown in an example in FIG. 2, information on where the train is located on a map base is displayed on the portable terminal 31 of the watchman. The train number, position, traveling direction, and speed are displayed on the screen, and a warning is displayed so that the color varies depending on the distance.
[0025]
According to this embodiment, the current position of the train can be constantly monitored with high accuracy, and the train approaching the work location can be reliably detected with high accuracy, so that a highly reliable train approach warning system can be constructed. In particular, by setting the accuracy of the train position to 2 m or less, it is possible to determine that the train has entered a different track from the normal track.
[0026]
In this embodiment, the train position is obtained with high accuracy by the DGPS method. However, if the accuracy is several tens of meters, the train position can be configured with no correction information. In this case, a means for obtaining correction information is not required, the position is obtained by a GPS receiver mounted on the train, and the position information may be sent directly from the train.
[0027]
Moreover, in this embodiment, although it has comprised so that a train position may be detected with a fixed period, it can also be comprised so that a position detection period may be made variable according to the speed of a train. That is, when the train speed is fast, the cycle is shortened, and when the train speed is slow, the cycle is lengthened. As a result, the amount of data sent from the train to the central command can be minimized while maintaining the position accuracy, and communication costs can be reduced.
[0028]
As described in the above embodiments, the present invention monitors the absolute position of the GPS antenna installed on the upper part of the train (such as the roof) by a central command by GPS, and the train position and train number approaching the work location. Is notified to the watchman at the work location, so that the approach of the train can be detected reliably every moment.
[0029]
【The invention's effect】
According to the present invention, the position of all trains can be collectively monitored at a central command station with high accuracy, the approach of the train can be detected reliably, and the burden on the watchmen can be reduced, resulting in human error. can be obtained a train approaching warning system can be prevented.
[Brief description of the drawings]
FIG. 1 is a system configuration explanatory diagram of a train approach warning system according to an embodiment.
FIG. 2 is an explanatory diagram illustrating an example of a screen display of a portable terminal in the train approach warning system according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Central command center apparatus 11 GPS reference station receiver 12 DGPS position calculation processing apparatus 13 Operation management system apparatus 14 Train alarm server 15 Router / server 2 Train mounting apparatus 20 Train vehicle 21 Car-mounted antenna 22 GPS receiver 23 Hybrid position estimation apparatus 24 Wireless modem 25 Wheel 3 Work location device 31 Portable terminal 32 GPS receiver 33 Wireless modem 34 Wireless transmitter 35 Alarm 4 Communication network 5 GPS satellite 6 GPS electronic reference station antenna

Claims (5)

In a system that consists of a train-mounted device, a work location device, and a central command center device, and monitors and warns the position of a train traveling on a railroad track,
The train mounting device is mounted on a train and has a function of measuring the position of the train by GPS, a function of transmitting measured position data to a central command center device, and train speed data detected by a speed detector mounted on the train. According to the function of changing the transmission cycle of the measurement position data of the train, the work location device is a function that the operator carries and measures the location of the work location by GPS, and the measurement location data is used for the central command center. The function to transmit to the device and the function to receive the train approach notification from the central command station device, the central command station device, the train and the work location measurement position data transmitted from the train mounting device and work location device Function to receive, function to determine that the train has approached the work location based on the measurement position data of the train and the work location, and a device to send a train approach notification to the work location device Train proximity warning system, comprising a. In the train approach warning system according to claim 1,
The central command station apparatus has a function of obtaining the train and work location corrected position data using the correction information measured by the central command station apparatus using the received train and work location measurement position data. Train approach warning system. In the train approach warning system according to claim 2,
The train approach warning system characterized in that an error of the corrected position data of the train is 2 m or less. In the train approach warning system according to claim 1,
The train mounting device has a function of transmitting discrete train measurement position data measured by GPS and train speed data detected by a speed detector mounted on the train to a central command station device. The command station apparatus has a function of continuously obtaining train position data from the received train measurement position data and train speed data. In the train approach warning system according to claim 1,
The work location apparatus performs a warning display of different types according to the distance between the train position and the work location, and a train approach warning system.

Images