KR20030011127A - Portable Alarm Scanner for Railroad Train Scanning of Differential GPS with GIS System - Google Patents

Abstract

PURPOSE: A portable train approach warning device is provided to allow workers to perform track maintenance in a safe manner by improving accuracy of reception of signal transmitted from the satellite. CONSTITUTION: A portable train approach warning device comprises a data collector for storing a train information and a track information to a compact flash memory; a transmitter combined with a global positioning system using a satellite, and which compares information regarding the current position of the train with a train's path to go, corrects error and transmits train data at a predetermined time interval through a radio system; and a portable receiver including a KBD for management of the receiver, an LCD for state checking, a global positioning system for obtaining information regarding the current position of the train, a receiver for receiving worker's data stored in a receiver CF and the information transmitted from the neighbor train, a controller, and an alarm operating in a specific condition.

Description

Portable Alarm Scanner for Railroad Train Scanning of Differential GPS with GIS System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of train location tracking and approach alarm systems, and to an alarm device and a control method developed for the safety of a worker in charge of track repair.

In order to prevent accidents occurring during railway repair, train access warning system of Korean Utility Model Registration No. 219500 (registration date: January 29, 2001) and Korean Patent Application No. 10-2002-0057746 (application date: 2002) There is a portable train approach alarm device using GPS of September 24) and its control method.

However, since the above train approach warning system uses only radio waves, it is difficult to be practically used because of accurate distance calculation due to the structure as shown in FIG. 1, and the portable train approach warning device using GPS and its control method are shown in FIG. 2. As shown in FIG. 5 or FIG. 6, only the detector for detecting the speed of the train and the collision are checked based on the information about the signal and the line received from the GPS. Only the separation distance and line information are indicated as information to prevent safety accidents such as progress priority, progress route, air condition, and priority.

6, 7, 8, and 9, there is no specific application method, and the error range of the location information received from the GPS, the interval of receiving time, the transmission period of the wireless data based on the related radio law, and the train. Even if you exclude all the detailed considerations, such as transmission error intervals depending on the speed of the train, you won't know the details such as passing and proximity or crossing until the train approaches the line. New trains need to be prepared for technical problems that can only be mistaken as predicted vehicles.

In order to solve such a conventional problem,

As the scope of application according to the working environment of the line repair workers, the technical field about specific information and transmission method required in each case regarding the composition of various lines such as the bypass line, branch line, multi branch line, compound branch line, and multi-complex branch line,

Technical fields to obtain information about the exact location of track maintenance workers and trains,

A technical field related to location information processing for processing location information on a railway and a path of an expected movement path of a train,

A technical field for transmitting and receiving detailed information about a train's approach distance, speed, direction, time, etc. from an approaching train based on a worker's location;

Receiving information on trains, it provides a configuration and control method for the technical field related to the specific handling of each case, such as the approach, detour, crossover, close passage, and anticipation of an accident due to passing.

1 is a block diagram of the Republic of Korea Utility Model Registration No. 219500 train approach alarm system.

2 is a representative view of the Republic of Korea Patent Application 10-2002-0057744, 20-2002-0029036.

3 is a schematic diagram when GIS and DGPS are applied.

4 is an example of application (in the case of branch lines) when GIS and DGPS are applied.

5 is a map when the train line is a single line or a single double line.

6 is a map when the train line is a bypass line.

7 is a map when the train line is a branch line;

8 is a map when the train line is a multi-branch line;

9 is a map when the train line is a multiple branch line.

10 is a basic structure of data transmitted from a train.

11 is a basic structure of worker data used in the receiver.

12 is a structure of train information stored in a transmitter in a data collector.

13 is a structure of line information stored in a transmitter in a data collector.

14 is a flow chart for the operation of the data collector, transmitter and receiver.

15 is a block diagram of a data collector.

16 is a structural diagram of a transmitter mounted on a train;

17 is a structural diagram of a receiver that a worker carries.

As a means for achieving the above object,

Answers to technical challenges in five areas such as geographic information system, location information system, wireless data transmission and reception, configuration and design of microcomputer controller, design and development of control program are required.

As a result, the device of this invention consists of three parts.

A key part of the present invention is the acquisition of accurate location information.

In order to obtain information about the exact location of a train or operator using information received from satellites, an accurate understanding of a location tracking system using satellites must be preceded.

In general, the GPS method, which is a location tracking system using satellites, is used to measure its position by receiving signals of four or more satellites and comparing them from 24 satellites located in orbits around the earth. However, satellite signals provided by the US operating satellites are intentionally implemented to reduce the accuracy of civil GPS use. no method.

Therefore, there is a need for a technique to reduce the error range and improve the precision, which is DGPS (Differential GPS) technology, which is a separate receiver in order to inform the receiver as much as the amount of information currently received from the correct position Alternatively, the use of equipment minimizes errors in positioning.

However, in order to provide information for correcting such an error, separate hardware is required, but since the separate hardware cannot be used in the current environment, the positional reference information for correcting such an error is accurate. Only by providing the information, correcting the wrong position is possible. This is why you need accurate geographic information for your tracks.

Railroads (train tracks) have a fixed geographical location, and if you use GIS (GIS) and DGPS technology that use this fixed geographic information, you can see how much of the data you receive now is out of order. It is possible to minimize the positioning error.

A data collector 100 for collecting, processing, converting, and storing related information in order to collect geographic information data of such a railroad, information about a travel time and a path of a train, and transmit the information from a train to an operator in an appropriate form;

A transmitter 200 mounted on a train to transmit train information and progress information;

While carrying a worker carrying it is made of a receiver 300 for receiving a signal transmitted from the train to generate an alarm.

The data collector 100 uses a direct method and an indirect method to acquire or collect accurate geographical information of the railway.

In order to obtain the geographic information, the GPS receiver 110 is connected to a portable device such as a PDA or a notebook computer to acquire geographic information. After collecting, process, convert and use it.

The indirect method uses a precisely prepared map to extract and input data on the progress route or generate the data automatically. These methods are based on the form of the NMEA protocol, which is a general form of LAYOUT for latitude and longitude used in the GPS receiver 110.

FIG. 15 shows a configuration of such a data collector, and the data collector is collected by connecting a portable GPS receiver 110 that receives satellite signals with a notebook 160 or PDA 170, which is a general mobile device, through RS232, which is a general communication protocol. Collector 100 having a function of processing, converting, and storing data, a database 120 for storing the organized data, and a train CF 240 and a worker through the storage medium CF (Compact Flash) CF 130 is configured as a device that can be stored in the CF (340).

However, in order to increase the universality of the mobile device in charge of data collection and the satellite receiver receiving the satellite signal, any mobile device supporting a standard connection method can be used, and the connection method between these devices is TTL, RS232, Various wired and wireless connection methods are available, including those not listed, such as RS485, USB, IrDA, Bluetooth, RF, 802.11a, 802.11b, IEEE1394.

The GPS receiver 110 basically refers to a high-performance DGPS receiver that receives at least eight satellite signals, not a low-cost general GPS receiver that receives three to four satellite signals unless otherwise indicated. .

Collector 100 refers to the rest of the external device except the notebook 160, PDA 170, GPS receiver 110, GPS receiver connection device 180, CF 130.

The transmitter 10 used in the train includes a GPS receiver 210 for receiving satellite signals, a CF 240 for storing previously input geographic information, and a transmission for composing transmission data in comparison with the received satellite signals. Wireless transmitter 220 for transmitting data with the control unit 230, LCD 260 for checking the status of the transmitter and KBD 250 for command input, interface 270 for internal connection, for transmission and reception connection It consists of a communication interface 290.

The transmitter attached to the train is a function to determine the exact location of its own, and the wireless data transmission and reception function that transmits information about the progress path.

Therefore, in order to calculate the error range of the signal received from the satellite, the position of the target is matched with the previously inputted geographic information, the correction value according to the change of the signal is calculated, and the error range is continuously corrected. .

The correction work for the error range is first transformed into TM coordinates based on the target, and processed into secondary TM coordinates in order to obtain more detailed information. The train data shown below are the components required for this task.

The train data 400 transmitted from the train includes a train number 410, a departure point 420, an arrival point 430, track information 440, a progress path 450, a current location 460, and a correction location 470. ), The conversion coordinates 480, etc., but required information may be added according to the place used.

In case of using general RF transmission and reception, considering the transmission time, satellite reception time, data processing time, transmission frequency band, and output according to the related laws, data transmission is unidirectional communication. Inevitably, in case of using W-CDMA system, bi-directional transmission and reception are possible.

The calculation of the transmission period and the expected time required for the data transfer are based on the following grounds. That is, the transmission period is determined in consideration of the time required for satellite reception, the estimated time required for internal data processing, and the estimated time required according to the amount of transmission.

For reference, as a result of experiment, transmission method is SIMPLEX transmission method, transmission frequency band is 100 ~ 400Mhz band, frequency conversion method FSK, transmission output 2W, transmission speed is 4800BPS, transmission period is 4 seconds, transmission data is approximately 1 It is about KBytes.

The receiver 30 carried by a worker includes a GPS receiver 320 for receiving data from a satellite and an RF receiver 310 for receiving train information transmitted from a train in order to determine a worker's current position, and a received train progress path. Is compared with the train progress route and railway geographic information stored in the CF 340, when the access control of the receiving control 330 to determine whether the passing or detour of the train and the approach type is determined to be the collision, the approach distance It consists of an alarm 370 for generating an alarm sound and the LCD 360 for checking the state of the receiver and the KBD 350 for manipulating it.

The receiver carried by the operator can track the location of FIGS. 5 to 9 in many cases when accurate measurement of the train and the user is possible.

The information received from the satellite contains a lot of errors, but the operator's receiver can be judged to be almost fixed because of its small moving range, and the satellite signal continuously received at the fixed point is compared with the received signal. The accuracy is very high because the range can be reduced.

Therefore, the receiver first corrects the positional information on the railroad by comparing the signal received from the satellite with the previously inputted geographic information.

When the operator's position is corrected, the receiver switches to the reception standby mode. At this time, the detailed position correction is performed by using the coordinates of the previously input work place and the geographic information of the train passing by. Will proceed.

When receiving the data transmitted from the train approaching the receiver 30, select the information on the current position 460 and the progress path 450 of the train from the received train data 400, worker data 500 By comparing the current position 520 and the track information 510 from the detailed error correction operation is performed.

At this time, by comparing how close the progress path of the approaching train passes through the worker's location, it is easy to determine the danger from the train, and as the number of trains passes, the progress path of each train is compared with each other. This increases the accuracy through recorrection of the error range.

The receiver 30 processes the job based on the train number 410 on the train data 400 received from each train in order to distinguish information on the access of several trains.

When a danger from the train is detected, the first alarm is generated when approaching 2KM, considering the evacuation time of the railway repair workers, and then an alarm is generated at 500m intervals, respectively, passing through 1.5KM, 1KM, 0,5KM Distinguish alarm distance by point

As described above, in order to increase the accuracy of a signal received from a satellite, the present invention secures geographic information of a railroad and a traveling path of a train in advance, so that detailed information about the movement of a track maintenance worker and a train, namely, Information on access, retreat, detour, and passing of trains, and pre-warning to ensure safe track repair in complex areas such as complex track areas, branch line points, and multi-intersection points. It is possible.

Claims (6)

Differential GPS method that calculates accurate location information of a railway at a specific point, and is calculated by comparing only the location information of the railway at a specific point without using a receiver or equipment as a second measuring device used in the existing DGPS. How to Database 120 for storing the train information 600 and the track information 700 and CF 130 device for recording the train information 600, track information 700 and Collector 100 for collecting, converting, and processing train information 600 and track information 700. Data collector device CF 240 device for recording the train information 600 and track information 700 and Transmission control unit 230 for comparing and reviewing the signal received from the GPS receiver 210 and RF transmitter 220 for transmitting data wirelessly (RF method or W-CDMA method) and Device for transmitting information about the route and location of the train, including auxiliary devices such as power supply, keyboard 250, LCD 260, etc. CF 340 device with a built-in worker data (500) RF receiving device (RF method or W-CDMA method) for receiving the information transmitted from the train GPS receiver 320 for receiving location information from the satellite and Receiving control 330 device for comparing the received train data 400 and worker data 500 and Alarm device 370 for generating an alarm in accordance with a dangerous situation and Portable train approach alarm receiver including auxiliary units such as power unit, keyboard 350, LCD 360, etc. In order to transmit the train information to be received by the receiver carried by the railway maintenance worker, Converting information about each location of the traveling route from the departure point to the arrival point of the train at regular intervals; Correcting the error of the location information received from the satellite; Comparing the modified location information with previously input location information; Converting the compared data into information for the recipient's reference; and Generating train data 400 considering the error of the actual distance according to the transmission period and the transmission time Compensating the coordinates of the current position by receiving the position information from the satellite in order to determine the current position of the worker, compared with the track information 510 included in the previously input worker data 500 and Obtaining track information 440 from train data 400 received from an adjacent train and comparing the track information 440 with the track information 510 included in the worker data; Collision detection step that predicts the result of detour, avoidance, close passage, collision prediction, etc. according to the progress path of nearby trains Calculating approach distance and speed to generate an alarm if a collision is expected