JPH1159419A - Train approach warning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly and securely detect and warn the approach of a train. SOLUTION: Positional measurement is carried out by a GPS receiver 12 inside a train 11 by means of the electric waves of a GPS satellite 13, and the positional measured information is transmitted by a transmitter 14. In a railroad construction site 16, positional measurement is carried out by a GPS receiver 17 by means of the electric waves of the GPS satellite 13, and the difference between the measured position and the positional information of the train 11 received by a receiver 18 is calculated in a differential calculating unit 19, and when the difference becomes less than a set value, a warning is generated by a warning device 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating an alarm when a train approaches a track construction site in railway track construction.

[0002]

2. Description of the Related Art Conventionally, there has been no suitable device of this kind, and a person in charge of monitoring always alerts a construction worker every time he or she sees a train approaching.

[0003]

Since conventional train approach detection relies on human eyes, there is a danger that the discovery of train approach may be delayed at times. In addition, there is a drawback in that labor cannot be saved because a dedicated lookout person is required. Attach a radio transmitter to the train, continue to emit a mere warning radio wave, install a receiver of the radio wave at the construction site, when the train approaches and the radio wave for the warning is received at a certain level or more, A method of generating a warning by judging that the train has approached can be considered.

However, in this method, the reach of radio waves varies significantly depending on the terrain, and it is difficult to keep track of the approaching distance of the train as the track construction moves. GP
A technique of receiving radio waves from a plurality of GPS satellites with an S receiver and measuring the position of the receiver has been put to practical use. However, it is known that an ordinary GPS receiver has a measurement position error of several tens of meters to several hundreds of meters. In order to reduce this error, differential GPS has been put to practical use. This is because at a known location, the GPS
A position measurement is performed by a receiver, error information of the measured position is broadcast, for example, and a measurement position using the same satellite from a GPS receiver at a mobile station near this is corrected by the broadcasted error information, It is intended to obtain more accurate position information. This is based on the fact that if the distance between the known position and the position of the mobile station is sufficiently smaller than the distance to the measurement satellite, the measurement errors at the two measurement positions are considered to be substantially equal. is there.

It is an object of the present invention to provide an apparatus for automatically detecting the approach of a train and generating an alarm by utilizing position measurement by GPS.

[0006]

According to the present invention, a first GPS receiver is provided on a train, and position information measured by the first GPS receiver is transmitted by a wireless transmitter, while a second GPS receiver is provided at a track construction site. And a receiving means for receiving transmission position information from the wireless transmitter.
The relative distance between the train and the construction site is calculated by the calculating means from the position measured by the GPS receiver and the position received by the receiving means, and an alarm is issued by the alarm when the relative distance becomes less than a predetermined value. You.

[0007]

FIG. 1 shows an embodiment of the present invention.
A GPS receiver 12 is provided on the train 11, and the GPS receiver 12 normally receives GPS radio waves from at least two GPS satellites 13 having the strongest radio waves to perform position measurement. The measured position information is transmitted by the wireless transmitter 14.

On the other hand, at a track construction site 16, a GPS receiver 17 and a receiver 1 for receiving a radio wave transmitted from the transmitter 14 are provided.
8 are provided. When the construction site 16 and the train are relatively close to each other, the GPS receiver 17
Receives GPS radio waves from the same set of GPS satellites 13 as the GPS satellites 13 that are receiving the GPS satellites 13 and performs position measurement. From the position measured by the GPS receiver 17 and the position information of the train 11 received by the receiver 18, the relative distance between the train 11 and the construction site 16 is calculated by the difference calculating means 19, and the relative distance is calculated. When the value falls below the set value, an alarm is issued from the alarm 21,
For example, a buzzer is generated.

In this case, both the GPS receivers 12 and 17 measure the position using the GPS radio waves of the same set of GPS satellites 13 and, based on the distance from these to the GPS satellites, determine the position of the train 11 and the construction work. Since the distance from the site 16 is extremely small, the measured position errors at the GPS receivers 12 and 17 have substantially the same value. By calculating the difference between these positions, that is, the relative distance, the position error is substantially reduced. Relative distance is obtained with very high accuracy. Therefore,
The approach and approach of the train 11 can be detected reliably and appropriately.

[0010]

As described above, according to the present invention, the approach of a train can be appropriately and reliably warned, and labor is saved, and there is no danger due to erroneous recognition.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

Claims (1)

[Claims] 1. A first GPS receiver provided on a train, a transmitter provided on the train for transmitting position information measured by the first GPS receiver, and a second GPS receiver provided on a track construction site Receiving means provided at the track construction site and receiving the position information transmitted from the transmitter; position information received by the receiving means;
A train approaching means comprising: calculating means for determining a relative distance between the train and the track construction site based on position information measured by a PS receiver; and an alarm device for generating an alarm when the relative distance becomes a predetermined value or less. Alarm device.