Ground coil response distance measurement method and response distance management method

Abstract

To provide a reaction distance measuring method to get a measured value of a ground unit reaction distance which can transmit an information signal for a detection of a home position without a payment of a lot of manpower and time.SOLUTION: An information signal about a reception of a vehicle speed information signal and a signal from a ground unit are acquired and stored for plural days by plural vehicles with prescribed time intervals, information signal about the actually 2 executed receptions among the stored information and vehicle speed information signals during receiving signals from the ground unit are extracted, reaction distance of the ground unit are calculate based on the extracted information, representative value for a specified term are determined based on the calculated reactance distance, determined representative values are stored or accumulated for 2 actual measurements, and when the 2 actual measured values coincide almost, an approximate equation of the representative value and actual value are determined based on the actual value and stored / accumulated value and the reaction distance is determined using the determined approximate equation.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a method for measuring a response distance (stopping range), which is an index related to the communication range of a ground sensor capable of transmitting an information signal for detecting a fixed position provided on a railway track, and a method for managing the response distance. [Background technology]

[0002] In recent years, the installation of platform doors on railway station platforms has become increasingly widespread. When platform doors are installed on station platforms, it is necessary to accurately stop the train with the platform doors aligned with the doors on the train, so ground coils capable of transmitting information signals (home position signals) for detecting the home position are installed on the tracks. Meanwhile, on the railway vehicle side, an on-board coil installed on the bottom of the vehicle receives the home position signal from the ground coil, which turns on a home position stop lamp installed in the driver's seat. The driver can then operate the brakes to stop the train with the platform doors aligned with the doors on the train while this lamp is on.

[0003] Furthermore, signals from the ground coil, which can transmit information signals for detecting the fixed position, can be used to send an opening command from the vehicle to the platform door control device to open the platform doors, or to control the opening of the doors on the vehicle side or to automatically stop the vehicle.An example of an invention related to a system that controls the opening of platform doors using fixed position signals transmitted from the ground coil is described in Patent Document 1. As described above, ground coils capable of transmitting information signals for detecting fixed positions play an important role in stopping railway vehicles and controlling the opening of platform doors.

[0004] On the other hand, the communication range of the ground coil, which can transmit the information signal for detecting the fixed position, may become narrower due to the deterioration or failure of its components. For this reason, as shown in Figure 9, the range over which the on-board coil BC can receive the fixed position signal from the ground coil GC is managed by a term called the response distance, and maintenance work is carried out to measure the response distance periodically. The ground coil GC, which can transmit an information signal for detecting its fixed position, is installed in a position such that the center line of the vehicle-side door and the center line of the platform door coincide when the center position O1 of the on-board coil BC coincides with the center position O2 of the ground coil GC. For example, if the opening width of the platform door is 2000 mm and the opening width of the vehicle-side door is 1300 mm, the reaction distance is set to a range of 700 to 800 mm, which is close to the difference. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-348770 [Patent Document 2] Patent No. 2904212 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventionally, the response distance of a wayside coil capable of transmitting an information signal for detecting a fixed position has been measured using a dedicated measuring device with a receiver that has the same function as the on-board coil that receives the fixed position signal from the wayside coil, and is configured to be at the same height as the on-board coil on the vehicle when placed on the rail and to be movable along the rail, and is equipped with a display that displays when a fixed position signal is received. Workers manually move the measuring device, checking the on / off display, marking both ends of the communication range, and measuring the distance of the markings with a ruler. Therefore, conventional measurement of response distance has had the problem of requiring a lot of manpower and time.

[0007] Incidentally, there is an invention described in Patent Document 2 that relates to a method for measuring the installation position of a ground coil. However, the invention described in this prior document optically measures the position of the ground coil, and therefore, although it can measure the physical position with high accuracy, it has the problem that it cannot directly measure the response distance corresponding to the communication range, which varies depending on the ground coil. The present invention has been made with an eye on the above-mentioned problems, and its purpose is to provide a response distance measurement method and a response distance management method that can obtain the measured value of the response distance of a ground sensor that can transmit an information signal to detect a fixed position without requiring a lot of manpower and time. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides: Vehicle speed information signal acquired by vehicle speed detection means mounted on the railway vehicle and A ground device response distance measurement method for measuring a response distance corresponding to a communication range of a ground device based on a signal from the ground device acquired by a signal receiving means for receiving a signal from the ground device, comprising: The vehicle speed detecting means and the signal receiving means receive a vehicle speed information signal and a first step of acquiring and storing information signals about reception of signals from the ground coils at predetermined time intervals over a plurality of days for a plurality of vehicles; Among the information stored in the first step, information signals regarding reception of the ground coils for which two actual measurements have been performed and a second step of extracting a vehicle speed information signal while the signal receiving means is receiving a signal from the ground coil; a third step of calculating a distance traveled by the vehicle while receiving a signal from the ground coil based on the information extracted in the second step as a response distance of the corresponding ground coil; a fourth step of determining a representative value for a predetermined period based on the response distance calculated in the third step; a fifth step of accumulating or accumulating the representative values ​​determined in the fourth step over the period of the two actual measurements; a sixth step of determining an approximation formula between the representative value and the actual measurement value based on the actual measurement value and the representative value accumulated or accumulated in the fifth step when the two actual measurement values ​​are substantially the same; It was made to include.

[0009] According to the above-mentioned method for measuring the response distance of a ground coil, it is possible to calculate the response distance of a ground coil capable of transmitting an information signal for detecting a fixed position based on data acquired by an on-board system installed in a vehicle, and therefore it is possible to obtain the measured value of the response distance without requiring a lot of manpower and time. Also, although there is variation in the response distance calculated based on data acquired once, an approximation formula for calculating the measured value of the response distance is determined by statistically processing data acquired multiple times by multiple vehicles, and therefore the response distance can be calculated using the determined approximation formula, and a highly accurate measured value of the response distance can be obtained.

[0010] Preferably, in the fifth step, the ground coils on the track in one direction of each line and the ground coils on the track in the opposite direction are grouped, and the approximation formula is determined for each group. According to this method, even when there is a non-negligible discrepancy in the response distance calculated based on data obtained by the on-board system between the ground coil on one side (up) and the ground coil on the track in the opposite direction (down), the approximate formulas for the representative value and the actual measured value are determined separately, so that highly accurate response distance measurement values ​​can be obtained.

[0011] The approximation formula is expressed as y=ax+b, where a and b are coefficients, The range of variation in the representative value is set as the error range by substituting the standard deviation σ of the average value of the monthly response distance into the variable x of the approximation formula. According to this method, a different correction formula can be set for each ground coil, thereby making it possible to obtain highly accurate response distance measurement values. Here, the coefficients a and b may be determined as different values ​​for each ground coil by statistically processing data acquired multiple times for multiple vehicles for each ground coil.

[0012] Furthermore, another invention of the present application is a method for managing response distances by determining a correction formula based on an approximation formula determined by the above-described procedure for measuring response distances of a ground device, and managing response distances by measurement values ​​corrected using this correction formula. In this method for managing response distances by measurement values ​​corrected using a correction formula determined by the above-described procedure for measuring response distances of a ground device, a seventh step of determining a range of variation in the representative value based on the representative value accumulated or accumulated in the fifth step, and applying the approximation formula to determine a correction formula for correcting the response distance calculated in the third step; The vehicle speed information signal is transmitted by the vehicle speed detection means and the signal receiving means mounted on the railway vehicle. and an eighth step of acquiring information signals relating to reception of signals from the ground coils on the orbit; a ninth step of calculating, based on the information acquired in the eighth step, a distance traveled by the vehicle while receiving signals from the ground coils as a response distance of each ground coil; a tenth step of correcting the reaction distance calculated in the ninth step using the corresponding correction formula to calculate a final measurement value; an eleventh step of determining whether the final measurement value calculated in the tenth step is between a preset upper limit value and a preset lower limit value of a response distance; The above is included.

[0013] According to the above method, a highly accurate response distance is detected based on data acquired by an on-board system installed on the vehicle, a range of variation in the representative value is set to determine a correction formula, and the final measurement value is calculated by correcting using this correction formula.Therefore, even if there is variation in the average response distance calculated based on data acquired by the on-board system, it can be appropriately corrected and compared with the upper and lower limits of the management range to make a judgment, and the response distances of ground coils installed at many stations can be centrally managed by a management device located at a remote location using the response distance calculated based on data acquired by the on-board system. [Effects of the Invention]

[0014] The response distance measurement method of the present invention makes it possible to obtain the measured value of the response distance of a ground device capable of transmitting an information signal for detecting a fixed position without requiring a lot of manpower or time. Also, the ground device management method of the present invention has the effect of enabling centralized management of the response distances of ground devices capable of transmitting an information signal for detecting a fixed position that are installed at multiple stations. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a system configuration diagram showing an example of a system that applies a ground sensor-responsive distance measurement method capable of transmitting an information signal for detecting a fixed position according to the present invention. FIG. [Figure 2] FIG. 1 is a block diagram showing a specific example of a system (on-board system) mounted on a vehicle running on a railway track. [Figure 3] (A) is a graph showing the response distance calculated for one ground coil for multiple trains on a daily basis for one month, and (B) is a histogram showing the distribution of the response distance for the same month. [Figure 4] (A) is a graph showing the relationship between the average calculated values ​​and the actual measured values ​​for ground coils on one side of 10 stations over a 10-month period, and (B) is a graph showing the relationship between the average calculated values ​​and the actual measured values ​​for ground coils on the opposite side of the same 10 stations over a 10-month period. [Figure 5]This is a graph showing the average change in the calculated value per month before correction for a ground sensor capable of transmitting an information signal for detecting a certain fixed position, and the average change in the calculated value per month for values ​​corrected using a linear approximation formula that shows the relationship between the calculated value per month and the actual measured value. [Figure 6] This is a graph showing the monthly changes in a ground sensor capable of transmitting an information signal for detecting a certain fixed position, when an error is added to the average value corrected using a linear approximation formula showing the relationship with the actual measured value. [Figure 7] 3 is a flowchart showing an example of a processing procedure of a method for measuring and managing a distance response to a ground coil according to the present invention. [Figure 8] (A) is a chart showing the average of the calculated monthly response distances of ground coils on up-bound tracks at multiple stations, as well as the average, maximum, minimum, difference between the maximum and minimum values, and standard deviation over 10 months. (B) is a chart showing the average of the calculated monthly response distances of ground coils on down-bound tracks at multiple stations, as well as the average, maximum, minimum, difference between the maximum and minimum values, and standard deviation over 10 months. [Figure 9] 1 is a diagram illustrating the concept of a response distance determined from the positional relationship between the communication range of a ground unit capable of transmitting an information signal for detecting a fixed position and the on-board unit. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The ground coil response distance measurement method according to the present invention will be described below with reference to the drawings. Fig. 1 is a system configuration diagram showing an example of a system for applying the ground coil response distance measurement method according to the present invention, and Fig. 2 is a block diagram showing an example of the configuration of an on-board system mounted on a railway vehicle (train). Note that the system configurations shown in Figs. 1 and 2 are examples and are not limited to these.

[0017] As shown in Figure 1, the system for implementing the ground coil response distance measurement method of the present invention is composed of an on-board system 10 that is mounted on vehicle T and collects various data about the vehicle while it is traveling, a data collection server 21 that receives and compiles data collected and stored by the on-board systems 10 of multiple vehicles, and an arithmetic device (computer) 23 that manages the ground coil 32, which acquires data necessary for calculating the response distance from the data collected by the data collection server 21 via a communication network 22, calculates the response distance, and is capable of transmitting an information signal to detect a fixed position based on the calculated response distance. In addition, when the response distance of a ground coil (hereinafter simply referred to as a ground coil) capable of transmitting an information signal for detecting the fixed position of each station is measured using a separate dedicated measuring device, the database in the data collection server 21 stores the measured value (hereinafter referred to as the actual measured value).

[0018] The on-board system 10 includes an on-board antenna 11 that receives signals from a ground antenna 32, a speed detector 12 that detects vehicle speed, a storage device 13 that stores the vehicle speed based on the received signals from the ground antenna 32 and the signals from the speed detector 12 together with time data, and a wireless communication device 14 that handles communication with an external data collection server 21. When the vehicle T enters a station and the on-board coil 11 enters the communication range (response distance) of a ground coil 32 installed at a predetermined position on the station platform 31, the on-board system 10 receives a signal from the ground coil 32 and stores an information signal indicating the presence or absence of a received signal in the storage device 13. The data stored in the storage device 13 is then transmitted to the data collection server 21 by the wireless communication device 14, for example, once a day, and is then stored in a database. Although not particularly limited, the ground coil 32 operates on power supplied via a power cable.

[0019] 2, in addition to the on-board coil 11, speed detector 12, storage device 13, and wireless communication device 14, the on-board system 10 also includes a receiver 15 that amplifies and waveform-shapes the signal received by the on-board coil 11 that receives a signal from the wayside coil, a drive device (travel motor) 16 that drives the wheels to rotate, a brake device 17 that brakes the vehicle, and a control device 18 that controls the drive device 16 and the brake device 17. Of these, the speed detector 12 is configured, for example, by a tachograph generator, and the control device 18 calculates the vehicle speed based on the signal from the tachograph generator and stores it in the storage device 13 together with time data.

[0020] Here, the vehicle speed based on the signal from the tachograph 12 can be detected using an existing general tachograph. Also, some existing trains in service run on tracks equipped with a monitoring device that samples the status of onboard equipment at predetermined time intervals set for each specification and stores the data together with time data. Therefore, the inventors considered that it might be possible to calculate the response distance of the ground coil by using a monitoring device to sample whether or not the on-board coil 11 has received a stop position signal and the vehicle speed, storing the sampled data together with time data, and analyzing the stored data.

[0021] As a result, it became clear that the response distances calculated for one month for each ground unit (4,359 pieces of data) cannot be used as they are for managing the response distances of ground units, as shown in Figure 3(A) and the calculated values ​​vary greatly due to large fluctuations from one measurement to the next, and there is a large discrepancy with the actual measured values ​​(dashed line) using a dedicated measuring device. Furthermore, when the distribution of reaction distances calculated based on one month's worth of speed data was examined, it was found that, as shown in the histogram in Figure 3(B), the overall distribution was close to a normal distribution and the monthly median was almost the same as the monthly average, but the average deviated from the actual measured value. Note that there are various possible causes for the large fluctuations in the reaction distances calculated each time based on sampling data from the vehicle, including variations in the characteristics of the on-board coils on the vehicle, installation errors of the wayside coils, the accuracy of vehicle speed detection, wear on the wheels and rails, wheel slippage depending on the weather, and differences in driver skill.

[0022] Furthermore, as a result of the data analysis, it was found that there was a positive correlation between the actual measured values ​​of the response distances of multiple ground coils and the average calculated values ​​based on the collected data, as shown in Figure 4. Note that Figure 4(A) is a graph showing the relationship between the average calculated values ​​of response distances over a 10-month period for ground coils on the track in one direction at 10 stations on a certain line where actual measurements of response distances had been taken twice in the past and the actual measured values, and Figure 4(B) is a graph showing the relationship between the average calculated values ​​over a 10-month period for ground coils on the track in the opposite direction at the same 10 stations as above and the actual measured values.

[0023] In Figures 4(A) and (B), the solid lines sloping upward to the right are regression lines obtained using the least squares method, and are straight lines (linear approximation equations) expressed as linear functions. The coefficient of determination R 2 are 0.7533 and 0.8592, respectively, which indicates a strong correlation between the average calculated values ​​and the measured values. Therefore, it is expected that the calculated values ​​can be corrected to values ​​closer to the measured values ​​using the above linear approximation formula. The reason why the slope of the straight line differs depending on the direction the train is heading (inner loop / outer loop or up / down on the loop line) is that, for example, if there is a difference in elevation between stations, that is, if there is a gradient on the track, the braking characteristics of the train change depending on the direction, which may result in a difference in the response distance calculated based on the data acquired by the on-board system 10. Therefore, depending on the line, the same approximation formula may be used regardless of the direction the train is heading.

[0024] Figure 5 shows the average change in the calculated response distance value per month for a certain ground coil before correction, and the average change in the calculated response distance value per month after correction using the linear approximation formula above. Figure 5 shows that before correction, as shown by the dashed line A, the response distance was outside the control range (the range between the upper limit Lmax and lower limit Lmin of the control response distance), but after correction, as shown by the solid line B, it is within the control range of the response distance, and it is clear that appropriate correction can be made using the linear approximation formula.

[0025] However, even if the above correction is made, as can be seen from the graph in Figure 5, there is variation in the average value of the response distance calculated based on the data acquired by the on-board system, while the actual measured value (actual response distance) does not change, so the monthly variation is a calculation error, and when the actual response distance changes, it is not possible to determine whether the change is due to variation or not. Therefore, a correction that takes into account the variation in the calculated average value is necessary. Therefore, the inventors decided to correct the calculated average value by taking into account the error, and to determine whether the calculated value of the response distance including the error falls within the range between the upper limit Lmax and the lower limit Lmin of the control response distance, as shown in Fig. 6. The specific method for setting the error to be taken into account in the calculated average value will be explained later.

[0026] Next, the procedure of the response distance measurement method and management method according to the present invention will be described with reference to the flowchart of FIG. In this embodiment, first, the on-board system 10 of a plurality of vehicles (e.g., commercial trains) equipped with the function of acquiring and storing received signals from ground coils capable of transmitting information signals for detecting running speed and fixed position acquires the running speed and the presence or absence of received signals (reception flag), and the data collection server 21 collects measurement data over a period of several days or several months (step S1).

[0027] Next, the database in the data collection server 21 is referenced to determine whether or not there are actual measurements of the response distance for the above-mentioned ground coils installed at each station, and ground coils for which actual measurements have been performed twice or more, for example, at intervals of one month or more, are extracted (step S2). The method of the present invention is intended to correct the measurement value based on the actual measurement value. Therefore, for ground coils for which no actual measurement has been performed even once, the processing from step S3 onwards is not performed until the first actual measurement is completed, and the processing from step S3 onwards is performed only after at least one actual measurement has been performed. Normally, the two measured values ​​will be nearly identical, but if the second measured value differs from the first measured value, it is assumed that there is an abnormality in the ground coil, and adjustment, repair, or replacement work will be carried out.

[0028] In step S3, the calculation device 23 calculates the vehicle speed information signal collected by the data collection server 21. and The response distance of each ground sensor is calculated based on the reception flag of the ground sensor. Specifically, if the timing when the reception flag first goes up is Ts, the timing when the reception flag goes down is Te, and the data sampling interval is t seconds, then the average of the speed at Ts and the speed t seconds after Ts is multiplied by t to find the distance the vehicle traveled in t seconds, then the average of the speed 2t seconds after Ts and the speed 2t seconds after Ts is multiplied by t to find the distance traveled in the next t seconds, and this is added to the distance traveled already found. This calculation is repeated until Te is reached, and the response distance (measured value) of the ground sensor being measured is obtained.

[0029] In the next step S4, the average value of the measured values ​​calculated as described above over a predetermined period (e.g., one month) is calculated and determined as a representative value. The representative values ​​are then accumulated or accumulated within the period of two actual measurements (step S5). Next, based on the accumulated (cumulated) representative values, an approximation formula between the representative value (average of calculated values) x and the actual measured value y is determined using the least squares method (step S6). For example, in the examples of Figures 4(A) and (B), the approximation formulas are determined as y = 0.6963x + 0.2623 and y = 0.4765x + 0.3681, respectively. Using this approximation formula, the measured value of the response distance can be obtained.

[0030] Next, when managing the response distance of each above-ground element, the range of variation in the representative value is determined based on the representative value accumulated (cumulated) in step S6, and the magnitude of the error to be added to the representative value is set using, for example, the standard deviation σ of the average value of the response distance for each month, and the correction formula to be used is determined (step S7). Specifically, when the average of the calculated monthly response distances for the ground coils at each station, the average value for 10 months, the maximum value, the minimum value, and the difference between the maximum and minimum values ​​are calculated, as shown in Figures 8(A) and (B), and the value shown in the rightmost column is obtained as the standard deviation σ, the largest value of 0.005 among stations A to J in (A) and the largest value of 0.010 among stations A to J in (B) are adopted as the value of σ. Then, the magnitude of the error to be added to the representative value is set to, for example, ±4σ, and this is inserted into the above approximation formula to obtain the correction formula for calculating the measurement values ​​X1 and X2, as follows: X1=0.6963(x±4σ)+0.2623=0.6963(x)+0.2623±0.0139 X2=0.4765(x±4σ)+0.3681=0.4765(x)+0.3681±0.0191 The magnitude of the error is not limited to ±4σ, but may be ±3σ or the like.

[0031] The process then shifts to the management of response distances. First, data (train speeds and whether or not stop position signals are received) for any number of days (including one day) is collected by the on-board systems 10 of multiple trains (step S8). Based on the collected data, the arithmetic unit 23 calculates the response distances of each on-board unit (step S9). Then, the calculation value of the response distance is corrected using the correction formula determined in step S7 to calculate a measured value (step S10). Then, it is determined whether the calculated measured value is within a preset management range of the response distance (for example, 700 to 800 mm) (step S11). The determination result is displayed on the display unit of the arithmetic unit 23.

[0032] According to the embodiment described above, by performing the above-described series of processes, the measured value of the response distance can be obtained by calculation without actually measuring the response distance of the ground coil using a dedicated measuring device, which significantly reduces the manpower and time required for managing the response distance, and also allows the response distances of ground coils that are installed at many stations and are capable of transmitting information signals to detect fixed positions to be centrally managed by a management device (arithmetic device 23) located at a remote location.

[0033] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and various modifications and changes are possible. For example, in the above-described embodiments, the data required for measuring the response distance of the ground coil is collected by the on-board system 10 installed on a train in operation, but data may be collected by running a measurement vehicle equipped with a system having the same functions as the on-board system 10. Furthermore, in the above embodiment, different approximation formulas are used for up / down (one direction / opposite direction), but the same approximation formula may be used depending on the route in question. [Explanation of symbols]

[0034] 10 On-board systems 11 Car 12 Speed ​​detector (speed generator) 13 Storage device 14 Wireless communication devices 15 Receiver 16 Drive unit 17 Brake equipment 18 Control Device 21 Data Collection Server 22 Communication Network 23 Arithmetic unit 31 Station Platform 32 Ground Coil

Claims

1. A ground coil response distance measurement method for measuring a response distance corresponding to a communication range of a ground coil based on a vehicle speed information signal acquired by a vehicle speed detection means mounted on a railway vehicle and a signal from the ground coil acquired by a signal receiving means for receiving a signal from the ground coil on a track, comprising: a first step of acquiring and storing vehicle speed information signals and information signals regarding reception of signals from the ground coils by the vehicle speed detection means and the signal receiving means at predetermined time intervals for a plurality of vehicles over a plurality of days; a second step of extracting, from the information stored in the first step, information signals relating to reception of the ground coils for which two actual measurements have been performed and vehicle speed information signals while the signal receiving means is receiving signals from the ground coils; a third step of calculating a distance traveled by the vehicle while receiving a signal from the ground coil based on the information extracted in the second step as a response distance of the corresponding ground coil; a fourth step of determining a representative value for a predetermined period based on the response distance calculated in the third step; a fifth step of accumulating or accumulating the representative values ​​determined in the fourth step over the period of the two actual measurements; a sixth step of determining an approximation formula between the representative value and the actual measurement value based on the actual measurement value and the representative value accumulated or accumulated in the fifth step when the two actual measurement values ​​are substantially the same; A ground sensor response distance measurement method comprising:

2. 2. The method for measuring distance response of a ground coil according to claim 1, wherein in the sixth step, the ground coils on the track in one direction of each line and the ground coils on the track in the opposite direction are grouped, and the approximation formula is determined for each group.

3. The approximation formula is expressed as y = ax + b, where a and b are coefficients, The ground sensor response distance measurement method according to claim 1 or 2, characterized in that the range of variation of the representative value is set as an error range by substituting the variable x of the approximation formula according to the standard deviation σ of the average value of the response distance for each month.

4. The method for measuring the response distance of a ground unit according to claim 3, characterized in that the coefficients a and b are determined as different values ​​for each ground unit by statistically processing data acquired multiple times from multiple vehicles for each ground unit.

5. A method for managing a response distance, which determines a correction formula based on an approximation formula determined by the response distance measurement method of a ground sensor according to any one of claims 1 to 4, and manages the response distance using a measurement value corrected using this correction formula, a seventh step of determining a range of variation in the representative value based on the representative value accumulated or accumulated in the fifth step, and applying the approximation formula to determine a correction formula for correcting the response distance calculated in the third step; an eighth step of acquiring a vehicle speed information signal and an information signal related to reception of a signal from a ground coil on a track by a vehicle speed detection means and a signal receiving means mounted on the railway vehicle; a ninth step of calculating, based on the information acquired in the eighth step, a distance traveled by the vehicle while receiving a signal from the ground coil as a response distance of each ground coil; a tenth step of correcting the reaction distance calculated in the ninth step using the corresponding correction formula to calculate a final measurement value; an eleventh step of determining whether the final measurement value calculated in the tenth step is between a preset upper limit value and a preset lower limit value of a response distance; A method for managing a response distance, comprising:

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