Specific device, specific method, and program

Abstract

Identifying the specific track a train is traveling on among multiple tracks where all trains are traveling in the same direction. [Solution] The identification device according to this disclosure includes: receiving means for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks in which the direction of travel of the train is a first direction; detection means for detecting vibrations at each position on the optical fiber based on the backscattered light; and identification means for identifying the first track on which the train is traveling among the plurality of first tracks based on the vibrations at each position on the optical fiber.

Description

Technical Field

[0001] The present disclosure relates to a specific device, a specific method, and a program.

Background Art

[0002] Currently, as a method for specifying the running position of a train in the longitudinal direction of a track, there is a method using a track circuit. However, the method using a track circuit has problems such as being able to grasp the running position of the train only at points, and the equipment becoming costly because a large number of track circuits need to be installed.

[0003] On the other hand, recently, the development of a technology called optical fiber sensing that uses an optical fiber as a sensor has been advanced. In optical fiber sensing, vibrations generated at each position on the optical fiber can be detected. Therefore, by using optical fiber sensing, the running position of a train can be grasped continuously and at low cost over an area. For example, as a technology for specifying the running position of a train in the longitudinal direction of a track by optical fiber sensing, the technology disclosed in Patent Document 1 can be cited.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, for example, when the track configuration is a double-track line, there are a plurality of tracks in the same direction in which the train runs. z However, the technology disclosed in Patent Document 1 described above has a problem that it is impossible to specify the track on which the train is running among the plurality of tracks as described above.

[0006] Therefore, in view of the above-mentioned problems, the purpose of this disclosure is to provide an identification device, identification method, and program that can identify the track on which a train is traveling among multiple tracks where the direction of train travel is the same. [Means for solving the problem]

[0007] A specific device according to one embodiment is: A receiving means for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, A detection means for detecting vibrations at each position on the optical fiber based on the backscattered light, The system includes a means for identifying the first track on which a train is running among a plurality of first tracks, based on vibrations at each position on the optical fiber.

[0008] One method of identification is: A specific method performed by a specific device, Receiving backscattered light from optical fibers laid near multiple first tracks along multiple first tracks whose direction of travel is the first direction, Based on the backscattered light, vibrations at each position on the optical fiber are detected, This includes identifying the first track on which the train is running among the plurality of first tracks based on vibrations at each position on the optical fiber.

[0009] A program according to one aspect is: On the computer, A procedure for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, A procedure for detecting vibrations at each position on the optical fiber based on the backscattered light, The procedure involves identifying the first track on which the train is running among the plurality of first tracks based on vibrations at each position on the optical fiber. [Effects of the Invention]

[0010] According to the above-described aspect, an effect can be obtained that a specifying device, a specifying method, and a program capable of specifying a track on which a train is running among a plurality of tracks having the same train running direction can be provided.

Brief Description of Drawings

[0011] [Figure 1] It is a diagram showing a configuration example of the specifying device according to the present disclosure. [Figure 2] It is a diagram for explaining an example of data showing a time-series change in vibration intensity at a certain position on an optical fiber. [Figure 3] It is a diagram for explaining an example of data showing the RMS of the vibration intensity at each position on the optical fiber when a train runs on each of Tracks A and B. [Figure 4] It is a diagram for explaining an example of data showing the frequency intensity of vibration at a specific position on the optical fiber when a train runs on each of Tracks A and B. [Figure 5] It is a flowchart for explaining an example of the operation flow of the specifying device according to the present disclosure. [Figure 6] It is a flowchart for explaining an example of the operation flow of the specifying device according to the present disclosure. [Figure 7] It is a diagram showing a configuration example of the specifying device according to the present disclosure. [Figure 8] It is a flowchart for explaining an example of the operation flow of the specifying device according to the present disclosure. [Figure 9] It is a flowchart for explaining an example of the operation flow of the specifying device according to the present disclosure. [Figure 10] It is a block diagram showing a configuration example of the specifying device according to the present disclosure. [Figure 11] It is a block diagram showing a hardware configuration example of a computer that realizes the specifying device according to the present disclosure.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that, for clarity of explanation, the following description and drawings are appropriately omitted and simplified. Also, in the following drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted as necessary. In addition, the specific numerical values and the like shown below are merely examples for facilitating the understanding of the present disclosure, and are not limited thereto.

[0013] <Embodiment 1> First, a configuration example of a specific device 10 according to the present disclosure will be described. FIG. 1 is a diagram showing a configuration example of a specific device 10 according to the present disclosure. As shown in FIG. 1, the specific device 10 includes a communication unit 11, a detection unit 12, and a specifying unit 13. Further, an optical fiber 20 is connected to the communication unit 11 of the specific device 10.

[0014] In the example of FIG. 1, the optical fiber 20 is laid in the vicinity of two tracks A and B along the two tracks A and B in the same direction as the running direction of the train. Note that the number of tracks in the same direction as the running direction of the train is not limited to two, and may be a plurality. Further, the optical fiber 20 may be laid overhead on poles such as utility poles and towers, or may be buried underground. Further, the optical fiber 20 may be laid in a manner of being enclosed in an optical fiber cable.

[0015] The communication unit 11 and the detection unit 12 are realized by, for example, a DAS (Distributed Acoustic Sensing) device. The communication unit 11 transmits pulsed light to the optical fiber 20, and receives the backscattered light generated as the pulsed light is transmitted through the optical fiber 20 from the optical fiber 20.

[0016] Here, when vibration occurs in the optical fiber 20, the characteristics (for example, wavelength) of the backscattered light transmitted through the optical fiber 20 change. Therefore, the detection unit 12 can detect the vibration generated in the optical fiber 20 based on the backscattered light received from the optical fiber 20 by the communication unit 11.

[0017] Furthermore, the detection unit 12 can determine the location where the backscattered light was generated, that is, the location where the vibration detected based on the backscattered light occurred (the distance from the communication unit 11 to the optical fiber 20), based on the time difference between the time when the communication unit 11 transmitted pulsed light to the optical fiber 20 and the time when the communication unit 11 received backscattered light from the optical fiber 20. Therefore, the detection unit 12 is capable of detecting vibrations at various positions on the optical fiber 20.

[0018] The identification unit 13 identifies the track on which the train is traveling among tracks A and B, based on the vibrations at each position on the optical fiber 20 detected by the detection unit 12, and also identifies the train's position along the longitudinal direction of the identified track.

[0019] The operation of the detection unit 12 and the identification unit 13 will be described in detail below. As described above, the detection unit 12 detects vibrations at each position on the optical fiber 20 based on the backscattered light received from the optical fiber 20. At this time, the detection unit 12 can calculate the vibration intensity based on the degree of change in the characteristics of the backscattered light.

[0020] Therefore, the detection unit 12 is capable of detecting the vibration intensity at each position on the optical fiber 20. Furthermore, the detection unit 12 is capable of detecting the time-series change in the vibration intensity at each position on the optical fiber 20.

[0021] Figure 2 illustrates an example of data showing the time-series change in vibration intensity at a specific location on the optical fiber 20. In Figure 2, the horizontal axis represents time, and the vertical axis represents vibration intensity. As shown in Figure 2, when a train is running near the optical fiber 20, vibrations with a greater intensity occur compared to when no train is running.

[0022] Therefore, the identification unit 13 identifies the period during which vibrations with an intensity of n (where n is, for example, an integer of 2 or more) times or more the average vibration intensity when the train is not running as the period during which the train is running. In this case, for example, the specific unit 13 may identify the period during which the above-mentioned vibrations occurred at any multiple locations on the optical fiber 20 as the period during which the train was running.

[0023] After identifying the period during which the train is running, the identification unit 13 identifies which of tracks A and B the train is running on, for example, using one of the following two methods.

[0024] (1) Method 1 In Method 1, the identification unit 13 identifies the train's travel period and then calculates the RMS (Root Mean Square) of the vibration intensity at each position on the optical fiber 20 during the identified travel period. Here, the specific unit 13 pre-stores data for each track A and B, indicating the RMS of the vibration intensity at each position on the optical fiber 20 when a train travels along that track.

[0025] Figure 3 illustrates an example of data showing the RMS of vibration intensity at various positions on the optical fiber 20 when a train travels along each track, A and B. In Figure 3, the horizontal axis represents the distance of the optical fiber 20 from the communication unit 11, and the vertical axis represents the RMS. As shown in Figure 3, since line B is closer to the optical fiber 20 than line A, the overall RMS value is larger compared to line A.

[0026] Therefore, the identification unit 13 compares the RMS during the travel period calculated above with the RMS during train travel on each of tracks A and B, which have been stored in advance, and identifies the track on which the train is traveling based on the comparison result. For example, the identification unit 13 identifies the track on which the train is traveling as the track with the smaller difference between the waveform of the RMS during the travel period calculated above and the track on which the train is traveling.

[0027] (2) Method 2 In Method 2, the identification unit 13 identifies the train's running period and then performs an FFT (Fast Fourier Transformation) operation on data showing the time-series change in vibration intensity at a specific location on the optical fiber 20 during the identified running period (for example, data like that shown in Figure 2) to calculate the frequency intensity of the vibration at the specific location. The specific location on the optical fiber 20 may be, for example, a location where vibrations with an intensity n times or more than the average vibration intensity when the train is not running occur during the train's running period. Here, the specific unit 13 pre-stores data indicating the frequency intensity of vibrations at a specific location on the optical fiber 20 when a train travels along each track A and B.

[0028] Figure 4 illustrates an example of data showing the frequency intensity of vibrations at a specific location on the optical fiber 20 when a train travels along each track, A and B. In Figure 4, the horizontal axis represents frequency, and the vertical axis represents frequency intensity. As shown in Figure 4, since line B is closer to the optical fiber 20 than line A, the overall frequency intensity values ​​are higher compared to line A.

[0029] Therefore, the identification unit 13 compares the frequency intensity during the running period calculated above with the frequency intensity during train operation on each of tracks A and B, which have been stored in advance, and identifies the track on which the train is running based on the comparison result. For example, the identification unit 13 identifies the track on which the train is running as the track with the smaller difference between the waveform of the frequency intensity during the running period calculated above and the track on which the train is running.

[0030] Furthermore, the identification unit 13 identifies the train's position in the longitudinal direction of the identified track using, for example, the following method. The identification unit 13 refers to data (for example, data like that shown in Figure 2) that shows the time-series change in vibration intensity at each position on the optical fiber 20. Here, for example, if vibrations with an intensity of n times or more than the average vibration intensity when the train is not running occur at a certain position on the optical fiber 20 at a certain time, it can be determined that the train is running at that position at that time. Therefore, the identification unit 13 determines the train's position along the longitudinal direction of the identified track based on the time-series change in vibration intensity at each position on the optical fiber 20.

[0031] Next, we will explain the operation flow of the specific device 10 related to this disclosure. Figure 5 is a flowchart illustrating an example of the operation flow of the identifying device 10 according to this disclosure. In the example of Figure 5, the identifying unit 13 identifies the track on which the train is traveling, among tracks A and B, based on the RMS of the vibration intensity at each position on the optical fiber 20 during the travel period, as described in Method 1 above. In addition, in the example of Figure 5, the identifying unit 13 pre-stores data for each track A and B showing the RMS of the vibration intensity at each position on the optical fiber 20 when the train travels along that track.

[0032] As shown in Figure 5, first, the communication unit 11 transmits pulsed light to the optical fiber 20 and receives backscattered light generated as the pulsed light is transmitted through the optical fiber 20 (step S101). Next, the detection unit 12 detects the time-series change in vibration intensity at each position on the optical fiber 20 based on the backscattered light received from the optical fiber 20 (step S102).

[0033] Next, the identification unit 13 identifies the train's travel period based on the time-series changes in vibration intensity at each position on the optical fiber 20 (step S103). Next, the specific unit 13 calculates the RMS of the vibration intensity at each position on the optical fiber 20 during the train's travel period (step S104).

[0034] Next, the specific unit 13 compares the RMS for the running period calculated in step S104 with the RMS for each train running on tracks A and B, which have been stored in advance (step S105). Next, the identification unit 13 identifies the track on which the train is running, among tracks A and B, based on the comparison result in step S105 (step S106).

[0035] Subsequently, the identification unit 13 identifies the train's position in the longitudinal direction of the track identified in step S106 based on the time-series change in vibration intensity at each position on the optical fiber 20 (step S107).

[0036] Figure 6 is a flowchart illustrating an example of the operation flow of the identifying device 10 according to this disclosure. In the example of Figure 6, the identifying unit 13 identifies the track on which the train is traveling, among tracks A and B, based on the frequency intensity of vibrations at a specific location on the optical fiber 20 during the travel period, as described in Method 2 above. In the example of Figure 6, the identifying unit 13 also pre-stores data for each track A and B indicating the frequency intensity of vibrations at a specific location on the optical fiber 20 when the train travels along that track.

[0037] As shown in Figure 6, first, the same process as steps S101 to S103 in Figure 5, steps S201 to S203, is performed. Next, the identification unit 13 performs FFT processing on data showing the time-series change in vibration intensity at a specific location on the optical fiber 20 during the train's travel period, and calculates the frequency intensity of the vibration at the specific location (step S204).

[0038] Next, the specific unit 13 compares the frequency intensity during the running period calculated in step S204 with the pre-held frequency intensity values ​​for each train running on tracks A and B (step S205).

[0039] Next, the identification unit 13 identifies the track on which the train is running, among tracks A and B, based on the comparison result in step S205 (step S206). Subsequently, the process in step S207, which is the same as step S107 in Figure 5, is performed.

[0040] As described above, according to this embodiment 1, the communication unit 11 transmits pulsed light to the optical fiber 20 and receives backscattered light generated as the pulsed light is transmitted through the optical fiber 20 from the optical fiber 20. The detection unit 12 detects vibrations at each position on the optical fiber 20 based on the backscattered light received from the optical fiber 20. The identification unit 13 identifies the track on which the train is traveling among tracks A and B based on the vibrations at each position on the optical fiber 20, and also identifies the train's position along the longitudinal direction of the identified track.

[0041] Specifically, the identification unit 13 calculates the RMS of vibration intensity during the train's travel period, compares the calculated RMS with the pre-recorded RMS values ​​for each of tracks A and B during train travel, and identifies the track on which the train is traveling based on the comparison result. Alternatively, the identification unit 13 calculates the frequency intensity of vibration during the train's travel period, compares the calculated frequency intensity with the pre-recorded frequency intensity values ​​for each of tracks A and B during train travel, and identifies the track on which the train is traveling based on the comparison result.

[0042] This makes it possible to identify which track the train is traveling on among tracks A and B, which are both traveling in the same direction.

[0043] <Embodiment 2> First, we will describe an example of the configuration of the specific device 10X related to this disclosure. Figure 7 shows an example configuration of the specific device 10X related to this disclosure. As shown in Figure 7, the specific device 10X differs from the specific device 10 shown in Figure 1 in that the specific part 13 is replaced with the specific part 13X.

[0044] In the example shown in Figure 7, the optical fiber 20 is laid along the four tracks A, B, C, and D that make up the quadruple track, and in the vicinity of the four tracks A, B, C, and D. Specifically, the direction of train travel on tracks A and B is the same (first direction; leftward in the figure), and the direction of train travel on tracks C and D is the same (second direction, opposite to the first direction; rightward in the figure). In the example shown in Figure 7, the optical fiber 20 is laid between tracks B and D, but this is not the only option. For example, the optical fiber 20 may be laid on the opposite side of track A from track B, or on the opposite side of track C from track D.

[0045] The identification unit 13X, like the identification unit 13, identifies the duration of the train's operation based on the time-series changes in vibration intensity at each position on the optical fiber 20 detected by the detection unit 12. After identifying the period during which the train is running, the identification unit 13X identifies the track on which the train is running among tracks A, B, C, and D, for example, using one of the following two methods.

[0046] (1) Method 1X In method 1X, the identification unit 13X identifies the train's travel period and then calculates the RMS of the vibration intensity at each position on the optical fiber 20 during the identified travel period.

[0047] Next, the specific unit 13X determines the direction of travel of the train. For example, the specific unit 13X refers to data showing the time-series change in vibration intensity at each position on the optical fiber 20 (for example, data like that shown in Figure 2). Here, for example, suppose that at position P1 on the optical fiber 20 (distance p1 from the communication unit 11 to the optical fiber 20), vibration occurs with an intensity of n times or more the average vibration intensity when the train is not running. Furthermore, suppose that subsequently, at position P2 on the optical fiber 20 (distance p2 from the communication unit 11 to the optical fiber 20, where distance p2 > distance p1), vibration occurs with an intensity of n times or more the average vibration intensity when the train is not running. In this case, it can be determined that the train is traveling in the same direction as the direction of travel of the train on tracks C and D (second direction; the rightward direction in the figure). Therefore, the specific unit 13X determines the direction of travel of the train based on the time-series change in vibration intensity at each position on the optical fiber 20.

[0048] Here, the specific unit 13X pre-stores data (for example, data like that shown in Figure 3) indicating the RMS of the vibration intensity at each position on the optical fiber 20 when a train travels along each track A and B. The specific unit 13X also pre-stores data (for example, data like that shown in Figure 3) indicating the RMS of the vibration intensity at each position on the optical fiber 20 when a train travels along each track C and D.

[0049] Therefore, if the direction of travel of the train is the same as the direction of travel of the train on tracks A and B, the identification unit 13X compares the RMS for the travel period calculated above with the RMS for each of the trains on tracks A and B that have been stored in advance, and identifies the track on which the train is traveling among tracks A and B based on the comparison result.

[0050] Furthermore, if the direction of travel of the train is the same as the direction of travel of the train on tracks C and D, the specific unit 13X compares the RMS for the travel period calculated above with the RMS for each of the trains on tracks C and D that have been stored in advance, and identifies the track on which the train is traveling among tracks C and D based on the comparison result.

[0051] (2) Method 2X In method 2X, the identification unit 13X identifies the train's travel period and then performs an FFT process on data showing the time-series change of vibration intensity at a specific location on the optical fiber 20 during the identified travel period (for example, data like that shown in Figure 2) to calculate the frequency intensity of the vibration at the specific location.

[0052] Next, the identification unit 13X determines the direction of travel of the train based on the time-series change in vibration intensity at each position on the optical fiber 20, using a method similar to the method 1X described above.

[0053] Here, the specific unit 13X pre-stores data (for example, data like that shown in Figure 4) indicating the frequency intensity of vibrations at specific locations on the optical fiber 20 when a train travels along each track A and B. The specific unit 13X also pre-stores data (for example, data like that shown in Figure 4) indicating the frequency intensity of vibrations at specific locations on the optical fiber 20 when a train travels along each track C and D.

[0054] Therefore, if the direction of travel of the train is the same as the direction of travel of the train on tracks A and B, the identification unit 13X compares the frequency intensity during the travel period calculated above with the pre-held frequency intensity during train travel on each of tracks A and B, and identifies the track on which the train is traveling among tracks A and B based on the comparison result.

[0055] Furthermore, if the direction of travel of the train is the same as the direction of travel of the train on tracks C and D, the specific unit 13X compares the frequency intensity during the travel period calculated above with the pre-recorded frequency intensity for each of the trains traveling on tracks C and D, and identifies the track on which the train is traveling among tracks C and D based on the comparison result.

[0056] Furthermore, the method for determining the train's position along the longitudinal direction of the identified track in the identification unit 13X may be the same as that used in the identification unit 13. That is, the identification unit 13X may determine the train's position along the longitudinal direction of the identified track based on the time-series change in vibration intensity at each position on the optical fiber 20, using the same method as in the identification unit 13.

[0057] Next, we will explain the operation flow of the specific device 10X related to this disclosure. Figure 8 is a flowchart illustrating an example of the operation flow of the identifying device 10X according to this disclosure. In the example of Figure 8, the identifying unit 13X identifies the track on which the train is traveling among tracks A, B, C, and D based on the RMS of the vibration intensity at each position on the optical fiber 20 during the travel period, as described in method 1X above. In the example of Figure 8, the identifying unit 13X pre-stores data for each track A and B showing the RMS of the vibration intensity at each position on the optical fiber 20 when the train travels on that track. In addition, the identifying unit 13X pre-stores data for each track C and D showing the RMS of the vibration intensity at each position on the optical fiber 20 when the train travels on that track.

[0058] As shown in Figure 8, first, the same process as steps S101 to S104 in Figure 5, steps S301 to S304, is performed. Next, the identification unit 13X determines the direction of travel of the train based on the time-series change in vibration intensity at each position on the optical fiber 20 (step S305).

[0059] If the direction of travel of the train identified in step S305 is the same as the direction of travel of the train on tracks A and B, the identification unit 13X compares the RMS for the travel period calculated in step S304 with the RMS for each train travel on tracks A and B that have been stored in advance (step S306). Next, based on the comparison result in step S306, the identification unit 13X identifies the track on which the train is traveling among tracks A and B (step S307).

[0060] On the other hand, if the direction of travel of the train identified in step S305 is the same as the direction of travel of the train on tracks C and D, the identification unit 13X compares the RMS for the travel period calculated in step S304 with the RMS for each train travel on tracks C and D that have been stored in advance (step S308). Next, based on the comparison result in step S308, the identification unit 13X identifies the track on which the train is traveling among tracks C and D (step S309). Subsequently, the process of step S310, which is the same as step S107 in Figure 5, is performed.

[0061] Figure 9 is a flowchart illustrating an example of the operation flow of the specific device 10X according to this disclosure. In the example of Figure 9, the specific unit 13X identifies the track on which the train is traveling among tracks A, B, C, and D based on the frequency intensity of vibration at a specific position on the optical fiber 20 during the travel period, as described in method 2X above. In the example of Figure 9, the specific unit 13X pre-stores data for each track A and B indicating the frequency intensity of vibration at a specific position on the optical fiber 20 when the train travels on that track. In addition, the specific unit 13X pre-stores data for each track C and D indicating the frequency intensity of vibration at a specific position on the optical fiber 20 when the train travels on that track.

[0062] As shown in Figure 9, first, the same process as steps S201 to S204 in Figure 6, steps S401 to S404, is performed. Next, the identification unit 13X determines the direction of travel of the train based on the time-series change in vibration intensity at each position on the optical fiber 20 (step S405).

[0063] If the direction of travel of the train identified in step S405 is the same as the direction of travel of the train on tracks A and B, the identification unit 13X compares the frequency intensity during the travel period calculated in step S404 with the pre-held frequency intensity for each train traveling on tracks A and B (step S406). Next, based on the comparison result in step S406, the identification unit 13X identifies the track on which the train is traveling among tracks A and B (step S407).

[0064] On the other hand, if the direction of travel of the train identified in step S405 is the same as the direction of travel of the train on tracks C and D, the identification unit 13X compares the frequency intensity during the travel period calculated in step S404 with the pre-held frequency intensity for each train traveling on tracks C and D (step S408). Next, based on the comparison result in step S408, the identification unit 13X identifies the track on which the train is traveling among tracks C and D (step S409). Subsequently, the process of step S410, similar to step S207 in Figure 6, is performed.

[0065] As described above, according to this second embodiment, the identification unit 13X calculates the RMS of vibration intensity during the train's travel period and identifies the train's direction of travel. If the train's direction of travel is the same as the train's direction of travel on tracks A and B, the identification unit 13X compares the RMS for the travel period calculated above with the pre-held RMS for each of the trains traveling on tracks A and B, and identifies the track on which the train is traveling based on the comparison result. On the other hand, if the train's direction of travel is the same as the train's direction of travel on tracks C and D, the identification unit 13X compares the RMS for the travel period calculated above with the pre-held RMS for each of the trains traveling on tracks C and D, and identifies the track on which the train is traveling based on the comparison result.

[0066] Alternatively, the identification unit 13X calculates the frequency intensity of vibrations during the train's travel period and identifies the train's direction of travel. If the train's direction of travel is the same as the train's direction of travel on tracks A and B, the identification unit 13X compares the frequency intensity during the travel period calculated above with the pre-recorded frequency intensity for each of the trains traveling on tracks A and B, and identifies the track on which the train is traveling based on the comparison result. On the other hand, if the train's direction of travel is the same as the train's direction of travel on tracks C and D, the identification unit 13X compares the frequency intensity during the travel period calculated above with the pre-recorded frequency intensity for each of the trains traveling on tracks C and D, and identifies the track on which the train is traveling based on the comparison result.

[0067] This makes it possible to identify which track (A, B, C, D) a train is running on, even when the track configuration is a quadruple track.

[0068] <Embodiment 3> This third embodiment corresponds to an embodiment that expands upon the above-described embodiments 1 and 2. Figure 10 is a block diagram showing an example configuration of the specific device 10Y related to this disclosure. As shown in Figure 10, the identification device 10Y comprises a receiving unit 11Y, a detection unit 12Y, and an identification unit 13Y.

[0069] The receiving unit 11Y receives backscattered light from optical fibers 20 laid near multiple first tracks along the first direction of travel of the train. The multiple first tracks correspond to, for example, tracks A and B described above.

[0070] The detection unit 12Y detects vibrations at each position on the optical fiber 20 based on backscattered light. The identification unit 13Y identifies the first track on which the train is running among a plurality of first tracks based on vibrations at each position on the optical fiber 20.

[0071] This makes it possible to identify the first track on which a train is traveling among multiple first tracks that all share the same first direction of travel.

[0072] The detection unit 12Y may also detect the time-series changes in vibration intensity at each position on the optical fiber 20. The identification unit 13Y may also identify the period during which the train traveled near the optical fiber 20 based on the time-series changes in vibration intensity at each position on the optical fiber 20. The identification unit 13Y may also calculate the RMS of the vibration intensity at each position on the optical fiber 20 during the travel period. Furthermore, the identification unit 13Y may identify the first track on which the train is traveling among a plurality of first tracks based on the calculated RMS.

[0073] Furthermore, the specific unit 13Y may pre-store the RMS for each of the multiple first tracks when a train is running on that first track. Also, the specific unit 13Y may identify the first track on which the train is running from among the multiple first tracks based on the calculated RMS and the pre-stored RMS for each of the multiple first tracks when a train is running.

[0074] Furthermore, the optical fiber 20 may be laid along a plurality of first tracks in the vicinity of the plurality of first tracks, and may also be laid along a plurality of second tracks in the vicinity of the plurality of second tracks where the direction of train travel is a second direction opposite to the first direction. The plurality of second tracks correspond to, for example, tracks C and D described above. The specific unit 13Y may also store in advance the RMS for each of the plurality of first tracks when a train travels on that first track, and for each of the plurality of second tracks when a train travels on that second track. The specific unit 13Y may also identify the direction of travel of a train that has traveled in the vicinity of the optical fiber 20 based on the time-series change of vibration intensity at each position on the optical fiber 20. Furthermore, if the identified direction of travel is the first direction, the specific unit 13Y may identify the first track on which the train is traveling based on the calculated RMS and the RMS for each of the plurality of first tracks when a train is traveling, which have been stored in advance. Furthermore, if the identified direction of travel is the second direction, the identification unit 13Y may identify the second track on which the train is traveling from among the multiple second tracks based on the calculated RMS and the RMS of each of the multiple second tracks held in advance.

[0075] Furthermore, the detection unit 12Y may also detect the time-series changes in vibration intensity at each position on the optical fiber 20. The identification unit 13Y may also identify the period during which the train traveled near the optical fiber 20 based on the time-series changes in vibration intensity at each position on the optical fiber 20. The identification unit 13Y may also perform a Fourier transform on the data showing the time-series changes in vibration intensity at a specific position on the optical fiber 20 during the travel period to calculate the frequency intensity of the vibration at that specific position. Furthermore, the identification unit 13Y may identify the first track on which the train is traveling among a plurality of first tracks based on the calculated frequency intensity.

[0076] Furthermore, the specific unit 13Y may pre-store the frequency intensity for each of the multiple first tracks when a train is running on that first track. Also, the specific unit 13Y may identify the first track on which a train is running from among the multiple first tracks based on the calculated frequency intensity and the pre-stored frequency intensity for each of the multiple first tracks when a train is running.

[0077] Furthermore, the optical fiber 20 may be laid along a plurality of first tracks in the vicinity of the plurality of first tracks, and may also be laid along a plurality of second tracks in the vicinity of the plurality of second tracks where the direction of train travel is a second direction opposite to the first direction. The plurality of second tracks correspond to, for example, tracks C and D described above. The specific unit 13Y may also store in advance the frequency intensity when a train travels along each of the plurality of first tracks, and in advance the frequency intensity when a train travels along each of the plurality of second tracks. The specific unit 13Y may also identify the direction of travel of a train that has traveled near the optical fiber 20 based on the time-series change of vibration intensity at each position on the optical fiber 20. Furthermore, if the identified direction of travel is the first direction, the specific unit 13Y may identify the first track on which the train is traveling based on the calculated frequency intensity and the frequency intensity when each of the plurality of first tracks is traveled, which has been stored in advance. Furthermore, if the identified direction of travel is the second direction, the identification unit 13Y may identify the second track on which the train is traveling from among the multiple second tracks based on the calculated frequency intensity and the frequency intensity of each of the multiple second tracks held in advance when the train is traveling.

[0078] Furthermore, the detection unit 12Y may also detect the time-series changes in vibration intensity at each position on the optical fiber 20. Additionally, the identification unit 13Y may determine the train's position along the longitudinal direction of the identified first track based on the time-series changes in vibration intensity at each position on the optical fiber 20.

[0079] <Hardware configuration of a specific device> Figure 11 is a block diagram showing an example of the hardware configuration of a computer 90 that implements the specific devices 10, 10X, and 10Y according to this disclosure.

[0080] As shown in Figure 11, the computer 90 includes a processor 91, memory 92, storage 93, input / output interface (I / F) 94, and communication interface (Communication I / F) 95, etc. The processor 91, memory 92, storage 93, input / output interface 94, and communication interface 95 are connected to each other by a data transmission path for sending and receiving data.

[0081] The processor 91 is a processing unit such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The memory 92 is a memory such as RAM (Random Access Memory) or ROM (Read Only Memory). The storage 93 is a storage device such as an HDD (Hard Disk Drive), SSD (Solid State Drive), or memory card. The storage 93 may also be a memory such as RAM or ROM.

[0082] A program is stored in the storage 93. This program includes a set of instructions (or software code) that, when loaded into a computer, causes the computer 90 to perform one or more functions in the specified devices 10, 10X, and 10Y described above. The components of the specified devices 10, 10X, and 10Y described above may also be realized by the processor 91 loading and executing the program stored in the storage 93. Furthermore, the storage function of the specified devices 10, 10X, and 10Y described above may be realized by memory 92 or storage 93.

[0083] Furthermore, the programs described above may be stored on non-temporary computer-readable media or tangible storage media. Examples, but not limited to, include RAM, ROM, flash memory, SSD or other memory technologies, CD (Compact Disc)-ROM, DVD (Digital Versatile Disc), Blu-ray® disc or other optical disc storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices. The programs may also be transmitted over temporary computer-readable media or communication media. Examples, but not limited to, include electrical, optical, acoustic or other forms of propagating signals.

[0084] The input / output interface 94 is connected to a display device 941, an input device 942, a sound output device 943, etc. The display device 941 is a device that displays a screen corresponding to the drawing data processed by the processor 91, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, or a monitor. The input device 942 is a device that receives operator input, such as a keyboard, mouse, and touch sensor. The display device 941 and the input device 942 may be integrated and implemented as a touch panel. The sound output device 943 is a device that outputs sound corresponding to the acoustic data processed by the processor 91, such as a speaker.

[0085] The communication interface 95 transmits and receives data to and from external devices. For example, the communication interface 95 communicates with external devices via a wired communication path or a wireless communication path.

[0086] Although the present disclosure has been described above with reference to embodiments, the present disclosure is not limited to the embodiments described above. Various modifications to the structure and details of the present disclosure are possible, as can be understood by those skilled in the art within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0087] Furthermore, each drawing is merely illustrative to illustrate one or more embodiments. Each drawing may be associated not only with one specific embodiment but also with one or more other embodiments. As those skilled in the art will understand, various features or steps described with reference to any one drawing may be combined with features or steps shown in one or more other drawings to create embodiments that are not explicitly illustrated or described. Not all features or steps shown in any one drawing to illustrate an exemplary embodiment are necessarily required, and some features or steps may be omitted. The order of steps shown in any of the drawings may be changed as appropriate.

[0088] Furthermore, some or all of the embodiments described above may also be described as follows, but are not limited to these. (Note 1) A receiving means for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, A detection means for detecting vibrations at each position on the optical fiber based on the backscattered light, The system includes a means for identifying the first track on which a train is running among a plurality of first tracks, based on vibrations at each position on the optical fiber. Specific equipment. (Note 2) The aforementioned detection means is The time-series change in vibration intensity at each position on the optical fiber is detected. The aforementioned specifying means is, Based on the time-series changes in vibration intensity at each position on the optical fiber, the period during which the train traveled near the optical fiber is identified. The RMS (Root Mean Square) of the vibration intensity at each position on the optical fiber during the aforementioned travel period is calculated. Based on the RMS calculated above, the first track on which the train is running is identified from among the plurality of first tracks. The specific device described in Appendix 1. (Note 3) The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the RMS when a train travels along that first track is stored in advance. Based on the calculated RMS and the RMS of each of the plurality of first tracks during train operation, which are stored in advance, the first track on which the train is running is identified from among the plurality of first tracks. The specific device described in Appendix 2. (Note 4) The optical fiber is Laid along the plurality of first tracks and in the vicinity of the plurality of first tracks, and laid along the plurality of second tracks in the vicinity of the plurality of second tracks in a second direction opposite to the first direction in which the train travels, The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the RMS when a train travels along that first track is stored in advance. For each of the aforementioned multiple second tracks, the RMS when a train travels on that second track is stored in advance. Based on the time-series changes in vibration intensity at each position on the optical fiber, the direction of travel of a train that passed near the optical fiber is determined. If the identified direction of travel is the first direction, the first track on which the train is traveling is identified from among the plurality of first tracks based on the calculated RMS and the RMS of each of the plurality of first tracks held in advance. If the identified direction of travel is the second direction, the second track on which the train is traveling is identified from among the plurality of second tracks based on the calculated RMS and the RMS of each of the plurality of second tracks held in advance. The specific device described in Appendix 2. (Note 5) The aforementioned detection means is The time-series change in vibration intensity at each position on the optical fiber is detected. The aforementioned specifying means is, Based on the time-series changes in vibration intensity at each position on the optical fiber, the period during which the train traveled near the optical fiber is identified. The time-series change in vibration intensity at a specific location on the optical fiber during the aforementioned travel period is Fourier transformed to calculate the frequency intensity of the vibration at that specific location. Based on the calculated frequency intensity, the first track on which the train is running is identified from among the plurality of first tracks. The specific device described in Appendix 1. (Note 6) The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the frequency intensity when a train travels on that first track is stored in advance. Based on the calculated frequency intensity and the pre-held frequency intensity of each of the plurality of first tracks during train operation, the first track on which the train is running is identified from among the plurality of first tracks. The specific device described in Appendix 5. (Note 7) The optical fiber is Laid along the plurality of first tracks and in the vicinity of the plurality of first tracks, and laid along the plurality of second tracks in the vicinity of the plurality of second tracks in a second direction opposite to the first direction in which the train travels, The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the frequency intensity when a train travels on that first track is stored in advance. For each of the aforementioned multiple second tracks, the frequency intensity when a train is running on that second track is stored in advance. Based on the time-series changes in vibration intensity at each position on the optical fiber, the direction of travel of a train that passed near the optical fiber is determined. If the identified direction of travel is the first direction, the first track on which the train is traveling is identified from among the plurality of first tracks based on the calculated frequency intensity and the frequency intensity of each of the plurality of first tracks during train travel that have been held in advance. If the identified direction of travel is the second direction, the second track on which the train is traveling is identified from among the plurality of second tracks based on the calculated frequency intensity and the frequency intensity of each of the plurality of second tracks during train travel that have been held in advance. The specific device described in Appendix 5. (Note 8) The aforementioned detection means is The time-series change in vibration intensity at each position on the optical fiber is detected. The aforementioned specifying means is, Based on the time-series changes in vibration intensity at each position on the optical fiber, the position of the train in the longitudinal direction of the identified first track is determined. The specific device described in Appendix 1. (Note 9) A specific method performed by a specific device, Receiving backscattered light from optical fibers laid near multiple first tracks along multiple first tracks whose direction of travel is the first direction, Based on the backscattered light, vibrations at each position on the optical fiber are detected, This includes identifying the first track on which the train is running among the plurality of first tracks based on vibrations at each position on the optical fiber, Specific method. (Note 10) On the computer, A procedure for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, A procedure for detecting vibrations at each position on the optical fiber based on the backscattered light, The procedure involves identifying the first track on which the train is running among the plurality of first tracks based on vibrations at each position on the optical fiber, and then performing the following steps: program.

[0089] Furthermore, some or all of the elements (e.g., configuration and function) described in Appendices 2-8 that are subordinate to Appendice 1 may also be subordinate to Appendices 9 and 10 in the same manner as those described in Appendices 2-8. Some or all of the elements described in any appendice may be applied to various hardware, software, recording means, systems, and methods for recording software. [Explanation of Symbols]

[0090] 10,10X,10Y specific equipment 11 Communications Department 11Y Receiver 12,12Y detection unit 13,13X,13Y Specific part 20 Fiber Optics 90 Computer 91 processors 92 memory 93 Storage 94 Input / Output Interfaces 941 Display device 942 Input device 943 Sound output device 95 Communication Interface

Claims

1. A receiving means for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, A detection means for detecting vibrations at each position on the optical fiber based on the backscattered light, The system includes a means for identifying the first track on which a train is running among a plurality of first tracks, based on vibrations at each position on the optical fiber. Specific equipment.

2. The aforementioned detection means is The time-series change in vibration intensity at each position on the optical fiber is detected. The aforementioned specifying means is, Based on the time-series changes in vibration intensity at each position on the optical fiber, the period during which the train traveled near the optical fiber is identified. The RMS (Root Mean Square) of the vibration intensity at each position on the optical fiber during the aforementioned travel period is calculated. Based on the RMS calculated above, the first track on which the train is running is identified from among the plurality of first tracks. The specific device according to claim 1.

3. The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the RMS when a train travels along that first track is stored in advance. Based on the calculated RMS and the RMS of each of the plurality of first tracks during train operation, which are stored in advance, the system identifies the first track on which the train is running among the plurality of first tracks. The specific device according to claim 2.

4. The optical fiber is Laid along the plurality of first tracks and in the vicinity of the plurality of first tracks, and laid along the plurality of second tracks in the vicinity of the plurality of second tracks in which the direction of train travel is in a second direction opposite to the first direction, The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the RMS when a train travels along that first track is stored in advance. For each of the aforementioned multiple second tracks, the RMS is stored in advance when a train travels along that second track. Based on the time-series changes in vibration intensity at each position on the optical fiber, the direction of travel of a train that passed near the optical fiber is determined. If the identified direction of travel is the first direction, the first track on which the train is traveling is identified from among the plurality of first tracks based on the calculated RMS and the RMS of each of the plurality of first tracks held in advance. If the identified direction of travel is the second direction, the second track on which the train is traveling is identified from among the plurality of second tracks based on the calculated RMS and the RMS of each of the plurality of second tracks held in advance. The specific device according to claim 2.

5. The aforementioned detection means is The time-series change in vibration intensity at each position on the optical fiber is detected. The aforementioned specifying means is, Based on the time-series changes in vibration intensity at each position on the optical fiber, the period during which the train traveled near the optical fiber is identified. The time-series change in vibration intensity at a specific location on the optical fiber during the aforementioned travel period is Fourier transformed to calculate the frequency intensity of the vibration at that specific location. Based on the calculated frequency intensity, the first track on which the train is running is identified from among the plurality of first tracks. The specific device according to claim 1.

6. The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the frequency intensity when a train travels along that first track is stored in advance. Based on the calculated frequency intensity and the pre-held frequency intensity of each of the plurality of first tracks during train operation, the first track on which the train is running is identified from among the plurality of first tracks. The specific device according to claim 5.

7. The optical fiber is Laid along the plurality of first tracks and in the vicinity of the plurality of first tracks, and laid along the plurality of second tracks in the vicinity of the plurality of second tracks in which the direction of train travel is in a second direction opposite to the first direction, The aforementioned specifying means is, For each of the aforementioned multiple first tracks, the frequency intensity when a train travels along that first track is stored in advance. For each of the aforementioned multiple second tracks, the frequency intensity when a train is running on that second track is stored in advance. Based on the time-series changes in vibration intensity at each position on the optical fiber, the direction of travel of a train that passed near the optical fiber is determined. If the identified direction of travel is the first direction, the first track on which the train is traveling is identified from among the plurality of first tracks based on the calculated frequency intensity and the frequency intensity of each of the plurality of first tracks during train travel that have been held in advance. If the identified direction of travel is the second direction, the second track on which the train is traveling is identified from among the plurality of second tracks based on the calculated frequency intensity and the frequency intensity of each of the plurality of second tracks during train travel, which have been held in advance. The specific device according to claim 5.

8. The aforementioned detection means is The time-series change in vibration intensity at each position on the optical fiber is detected. The aforementioned specifying means is, Based on the time-series changes in vibration intensity at each position on the optical fiber, the position of the train in the longitudinal direction of the identified first track is determined. The specific device according to claim 1.

9. A specific method performed by a specific device, Receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, Based on the backscattered light, vibrations at each position on the optical fiber are detected, This includes identifying the first track on which the train is running among the plurality of first tracks based on vibrations at each position on the optical fiber, Specific method.

10. On the computer, A procedure for receiving backscattered light from optical fibers laid near a plurality of first tracks along a plurality of first tracks whose direction of travel is a first direction, A procedure for detecting vibrations at each position on the optical fiber based on the backscattered light, The procedure involves identifying the first track on which the train is running among the plurality of first tracks based on vibrations at each position on the optical fiber, and then performing the following steps: program.

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