CN112729770B - Track companion optical cable fault point positioning method, system and memory - Google Patents
Track companion optical cable fault point positioning method, system and memory Download PDFInfo
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- CN112729770B CN112729770B CN202011353971.6A CN202011353971A CN112729770B CN 112729770 B CN112729770 B CN 112729770B CN 202011353971 A CN202011353971 A CN 202011353971A CN 112729770 B CN112729770 B CN 112729770B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
A fault point positioning method for a track companion optical cable comprises the following steps: obtaining the corresponding relation between the optical fiber length nodes on the track companion optical cable and the geographic coordinates along the track; and acquiring an optical fiber fault point on the track accompanying optical cable, and acquiring a geographic coordinate corresponding to the optical fiber fault point by combining the corresponding relation between the optical fiber length node on the track accompanying optical cable and the geographic coordinate along the track. According to the invention, the target vibration signals acquired by the track accompanying optical cables corresponding to the tracks and the geographic coordinate information acquired by the mapping trains running on the tracks are mapped based on time synchronization, so that the mapping between the optical fiber length nodes corresponding to the target vibration signals and the geographic coordinates is realized, and the optical fiber length nodes corresponding to the target vibration signals are combined to match the geographic coordinates when the optical fiber faults are detected, so that the fault positions are accurately positioned.
Description
Technical Field
The invention relates to the technical field of track optical fibers, in particular to a track companion optical cable fault point positioning method, a system and a memory.
Background
Track-concomitant optical cables, i.e. optical cables laid along the track, are currently a common means of railway network communication and security monitoring.
Various mechanical construction processes such as farmland cultivation, factory construction, road repair, illegal construction and the like and natural disaster factors can occur along the track, and huge threats can be caused to the safety of the track accompanying optical cable. The existing track companion optical cable safety state monitoring method (for example, a railway optical cable state real-time monitoring system and method CN108880668A and a railway safety monitoring system and monitoring method CN 106452567A) can only realize the positioning of the optical cable fault point along the length of the optical cable.
Because the optical cable and the track are both bent and extended, and the optical cable can be bent, reserved for optical cable joints, bypass culverts, bypass ponds and the like relative to the track in the laying process, the lengths of the optical cable and the positions of the track are not in one-to-one correspondence. When a track-concomitant optical cable fails, it is difficult to obtain the exact location of the failure point on the track.
At present, after the optical cable fault point is positioned along the length of the optical cable, the approximate interval position of the optical fiber fault on the track can be deduced only according to the position corresponding relation between the whole length of the optical cable and the whole length of the track, but the position of the optical cable fault point on the track cannot be accurately determined, and the optical cable fault point can be judged only by a manual secondary inspection method, so that the fault removal efficiency of the track communication optical cable is very low.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a method, a system and a memory for locating fault points of a track accompanying optical cable.
One of the purposes of the invention is to adopt the following technical scheme:
a fault point positioning method for a track companion optical cable comprises the following steps:
s100, obtaining a corresponding relation between optical fiber length nodes on a track companion optical cable and geographic coordinates along the track;
s200, acquiring an optical fiber fault point on the track accompanying optical cable, and acquiring a geographic coordinate corresponding to the optical fiber fault point by combining the corresponding relation between the optical fiber length node on the track accompanying optical cable and the geographic coordinate along the track.
Preferably, the method further comprises step S300: and acquiring a scene picture associated with the geographic coordinates corresponding to the optical fiber fault point.
Preferably, in step S100, the track is mapped along the track by a mapping system carried by the train, so as to obtain the geographic coordinates along the track; the mapping system also collects scene pictures and associates geographic coordinates collected at the same time with the scene pictures.
Preferably, the step S100 specifically includes the following steps:
s101, marking a train carrying a mapping system as a mapping train, performing geographical mapping through the mapping system arranged on the mapping train, and collecting geographical coordinate information of a track in real time;
s102, collecting vibration signals generated by train running on a track through optical fibers in a track accompanying optical cable; marking a vibration signal corresponding to a mapping train as a target vibration signal, and acquiring an optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of a mapping system on the mapping train;
and S103, correlating geographic coordinate information acquired by the same mapping train at the same time with the generated target vibration signal, and realizing the mapping between the optical fiber length node corresponding to the target vibration signal and the geographic coordinate information.
Preferably, in step S103, a target track is selected first, and geographic coordinate information acquired when the mapping train runs on the target track is associated with a generated target vibration signal; the target track is a track between two adjacent sites along the railway.
Preferably, in step S103, when a plurality of trains travel in the same direction on the target track, the arrangement sequence of the mapping trains is first obtained according to the departure time of the station, and then the target vibration signals of the mapping trains corresponding to the track accompanying optical cable are obtained according to the arrangement sequence.
Preferably, in step S102, the method for obtaining the optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of the mapping system includes: firstly, acquiring a length value of an optical fiber length node on a railway along line, and acquiring a vibration detection range corresponding to the target vibration signal; the optical fiber length node corresponding to the target vibration signal is a intercepting range taking the installation position of the mapping system on the mapping train as the center and taking the length value as the diameter in the corresponding vibration detection range; the length value is a fixed value.
Preferably, in step S102, the method for obtaining the optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of the mapping system includes: firstly, dividing a track companion optical cable into a plurality of optical fiber length nodes, and acquiring the optical fiber length nodes positioned in a vibration detection range of the target vibration signal; and acquiring an optical fiber length node where the mapping system is positioned as an optical fiber length node corresponding to the target vibration according to the length of the mapping train and the installation position of the mapping system.
The second purpose of the invention adopts the following technical scheme:
a track companion cable fault point positioning system comprising: a memory module for storing a computer program;
the processing module is connected with the storage module and is used for realizing the fault point positioning method of the track companion optical cable when the computer program is executed.
The third purpose of the invention adopts the following technical scheme:
a memory, wherein a computer program is stored in the memory, and when the computer program is executed, the method for positioning the fault point of the track companion optical cable is realized.
The invention has the advantages that:
1. in the invention, the vibration signals in the track accompanying optical cable corresponding to the track and the geographic coordinate information acquired by the mapping system carried by the mapping train running on the track are mapped based on time synchronization, thereby realizing the mapping of the optical fiber length node where the vibration signals are and the geographic coordinate obtained by mobile mapping.
2. According to the invention, the coordinate mapping is carried out on the track along the track through the train carrying mapping system, so that the mapping efficiency is improved, and the manpower is released.
3. According to the invention, based on the corresponding relation between the track and the track accompanying optical fiber, the geographic coordinate information detected by the mapping system and the vibration signal acquired by the optical fiber sensing system are combined, so that the accurate adaptation of the optical fiber length node and the track geographic coordinate is realized, and the accurate positioning of the fault position is facilitated by combining the optical fiber length node matching geographic coordinate where the fault is located when the optical fiber fault is detected.
4. The geographic coordinate information collected by the mapping system can be used as a bridge, scene pictures collected by the mapping system are associated, and the optical fiber fault position is further checked by combining the scene pictures.
Drawings
FIG. 1 is a flow chart of a mapping method between a track-concomitant optical cable and a track space according to embodiment 1;
fig. 2 is a schematic diagram of an optical fiber length node acquisition scenario set forth in embodiment 1;
fig. 3 is a schematic view of another optical fiber length node acquisition scenario set forth in embodiment 1;
FIG. 4 is a schematic diagram of an application scenario of the mapping system between the optical cable and the inter-track space proposed in embodiment 4;
fig. 5 is a flowchart of a fault point positioning method for a track-concomitant optical cable according to embodiment 6.
Detailed Description
Example 1
Referring to fig. 1, the mapping method between a track-concomitant optical cable and a track space provided in this embodiment includes the following steps.
S101, recording a train carrying the mapping system as a mapping train, performing geographical mapping through the mapping system installed on the mapping train, and collecting geographical coordinate information of the track in real time.
S102, collecting vibration signals generated by train running on a track through optical fibers in a track accompanying optical cable; and marking the vibration signal corresponding to the mapping train as a target vibration signal, and acquiring an optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of the mapping system on the mapping train. In particular, in this step, vibration signals may be collected through redundant optical fibers in the track companion cable.
Specifically, in this step, the method for obtaining the optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of the mapping system includes: when a target vibration signal generated by a mapping train at any moment is acquired, firstly acquiring a length value of an optical fiber length node on a railway along line, and acquiring a vibration detection range corresponding to the target vibration signal; the optical fiber length node corresponding to the target vibration signal is a intercepting range taking the installation position of the mapping system on the mapping train as the center and taking a length value as the diameter in the vibration detection range corresponding to the target vibration signal; the length value is a fixed value. Referring specifically to fig. 2, in this embodiment, a corresponding optical fiber length node n is calculated according to geographical coordinate information acquired by the mapping train each time in combination with a vibration detection range Dn of the mapping train. When the embodiment is implemented, the length value corresponds to the mapping train, and the length value is smaller than or equal to the distance of the corresponding mapping train running on the adjacent two times of geographic coordinate information acquisition time intervals, so that the condition that the same optical fiber length node maps two different geographic coordinates is avoided. In this embodiment, the range of the optical fiber length node n corresponding to the mapping train at the current time is shown in fig. 2.
In specific implementation, the optical fiber length node corresponding to the target vibration signal is obtained according to the length of the mapping train and the installation position of the mapping system, and the method can be realized as follows: dividing a track accompanying optical cable into a plurality of optical fiber length nodes along the track extending direction, and acquiring the optical fiber length nodes positioned in the vibration detection range of a target vibration signal when the target vibration signal generated by a mapping train at any moment is acquired; and acquiring an optical fiber length node where the mapping system is positioned as an optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of the mapping system. For example, as shown in FIG. 3, the pre-partitioned fiber length nodes on the track-concomitant cable include n-4 to n+3. When the surveying train is positioned in the position shown in fig. 3, the vibration detection range is Dn, the vibration detection range Dn spans from the optical fiber length node n-3 to n+1, the current surveying system can be calculated to be positioned on the optical fiber length node n by combining the length of the surveying train and the installation position of the surveying system on the surveying train, so that the optical fiber length node n is used as an optical fiber length node corresponding to the current target vibration signal, and the geographical coordinate information acquired by the surveying train at the current moment is mapped with the optical fiber length node n. When the embodiment is implemented, the length of each optical fiber length node on the railway along line should be smaller than or equal to the minimum distance of the mapping train running on the time interval of two adjacent geographic coordinate information acquisition times, so as to avoid the condition that the same optical fiber length node maps two different geographic coordinates.
And S103, correlating geographic coordinate information acquired by the same mapping train at the same time with the generated target vibration signal, and mapping between the optical fiber length node corresponding to the target vibration signal and the geographic coordinate information, thereby mapping the track accompanying optical cable and the position between tracks.
In the specific implementation, in step S103, a target track is first selected, and when a mapping train enters the target track, geographic coordinate information acquired when the mapping train runs on the target track is associated with a generated target vibration signal, so that an optical fiber length node corresponding to the target vibration signal is mapped with geographic coordinate information associated with the target vibration signal.
In this embodiment, the geographic coordinate information obtained by the mapping system is the coordinate of the mapping system on the track along line, that is, the geographic coordinate of the track. In this embodiment, through surveying and mapping the operation of train, map the geographical coordinates of track and optic fibre length node, it is accurate to measure, and degree of automation is high, efficient.
Example 2
In step S102 of the present embodiment, when a plurality of trains travel in the same direction on a target track, the track accompanying optical cable obtains a set of vibration signals at the same time, the number of the set of vibration signals corresponds to the number of trains traveling in the same direction, and each signal in the set of vibration signals corresponds to a different position of the track accompanying optical cable; according to the station departure time or the train arrival time, the arrangement sequence of the mapping trains in the plurality of trains is obtained, the arrangement sequence is compared with the arrangement sequence of any group of vibration signals on the track accompanying optical cable, and the target vibration signals of the corresponding mapping trains on the track accompanying optical cable at any moment are obtained.
It is assumed that in the present embodiment, the track R may be set as the target track. The track companion optical cable L of the track R acquires a target vibration signal H generated by the surveying and mapping train C, geographical coordinate information D acquired by a surveying and mapping system carried by the surveying and mapping train C, the target vibration signal H with the same acquisition time is associated with the geographical coordinate information D, and an optical fiber length node corresponding to the vibration signal H and the geographical coordinate information D are mapped.
Specifically, the track R where the target vibration signal H is located refers to a track between two adjacent stations where the vibration signal H is located, and may be specifically referred to as (H; R1, R2), where H represents the target vibration signal, R1 and R2 represent two adjacent train stations where the mapping train passes sequentially, and (H; R1, R2) represents that the mapping train corresponding to the vibration signal H travels from the train station R1 to the train station R2.
When a plurality of trains run in the same direction on the measured track R and at least one of the trains is mapped, firstly, the arrangement sequence of the trains running in the same direction is obtained, and the target vibration signals of the corresponding mapped trains on the track accompanying optical cable are obtained according to the arrangement sequence.
Suppose that there are 3 vibration signals H on the track-companion cable L 1 、H 2 、H 3 Synchronously generating and moving the 3 vibration signals in the same direction on the track-companion optical cable L, and in the signal moving direction, H 1 At the forefront, H 3 At the end. Meanwhile, three trains C are arranged on the track R corresponding to the track accompanying optical cable L 1 、C 2 、C 3 In the same direction and the driving direction and 3 vibration signals H 1 、H 2 、H 3 Is the same in the moving direction, and C 1 At the forefront, C 3 At the end. Then, it can be seen that the vibration signal H 1 Association train C 1 Vibration signal H 2 Association train C 2 Vibration signal H 3 Association train C 3 。
Suppose train C 2 To map the train, the vibration signal H 2 Is the target vibration signal. Train C 2 The geographical coordinate information collected by the carried mapping system is marked as D 2 Obtaining a target vibration signal H 2 Corresponding optical fiber length node and geographic coordinate information D 2 Is a mapping relation of (a) to (b).
Example 3
In step S103 of embodiment 2, the target track is a track between two adjacent sites along the railway. Therefore, the track and the track companion optical cable are divided by the distance between two adjacent stations, so that the optical fiber detectors are conveniently arranged at the stations, the accurate positioning of the optical fiber length nodes is realized, and the mapping precision of the optical fiber length nodes and the geographic coordinates is further improved.
In this embodiment, two adjacent stations on a certain line are denoted as A and B, and a track-concomitant optical cable between the train stations A and B is denoted as L AB Unit track companion optical cable L AB Collected vibration signal H i Is denoted as { vibration signal H ] i Acquisition time T i Optical fiber length node L i And Ti is a vibration signal H i Acquisition time of LiRepresenting vibration signal H i Corresponding fiber length nodes. Meanwhile, geographic coordinate information Dj acquired by a mapping system carried by a mapping train running on a track between train stations A and B is recorded as { geographic coordinate information D ] j Acquisition time T j Where Tj represents the acquisition time of the geographic coordinate information Dj. Thus, in this embodiment, the track-concomitant optical cable marker L can be confirmed from the train stations A and B AB Target vibration signal { vibration signal H } i Acquisition time T i Optical fiber length node L i And correlating the geographic coordinate information Dj with the optical fiber length node Li according to Ti=Tj, and acquiring a mapping relation between the geographic coordinate information Dj and the optical fiber length node Li.
Example 4
Referring to fig. 4, in this embodiment, there is provided a mapping system between a track-concomitant optical cable and a track, including: the device comprises an optical fiber detector 1, a communication module 6, a processing module 7 and a storage module 8.
The optical fiber detector is used for detecting vibration signals in the track accompanying optical cable corresponding to the target track.
The communication module 6 is used for communication with the fiber optic probe 1 and the mapping system 4 mounted on the train 3.
A storage module 8 for storing a computer program.
The processing module 7 is connected to the communication module 6 and the storage module 8, respectively, and is configured to implement the mapping method between the track-concomitant optical cable and the track according to embodiment 1, embodiment 2, embodiment 3, or embodiment 4 when executing the computer program, so as to implement mapping between the optical fiber length node and the geographic coordinates on the track 5.
In particular, the processing module 7 may set a geographical range, and the processing module communicates with the optical fiber detector for detecting the vibration signal in the corresponding geographical range and the mapping system in the corresponding geographical range through the communication module. Therefore, through the division of the regional ranges, signal crosstalk in different regional ranges can be avoided, and the accuracy and reliability of data processing are improved.
In specific implementation, the region range associated by the processing module 7 includes at least one section of track between adjacent train stations, so that the corresponding relation between the track 5 and the track accompanying optical cable 2 is accurately adapted through the train stations, and the association accuracy of the target vibration signal and the geographic coordinate information is ensured.
Example 5
The present embodiment provides a memory storing a computer program for implementing the method for mapping between a track-concomitant optical cable and a track space described in embodiment 1, embodiment 2, or embodiment 3 when the computer program is executed.
Example 6
Referring to fig. 5, the embodiment provides a method for locating fault points of a track-associated optical cable, which specifically includes the following steps:
s100, obtaining the corresponding relation between the optical fiber length nodes on the track companion optical cable and the geographic coordinates along the track.
Specifically, in the step, the mapping method between the track companion optical cable and the inter-track space is adopted to obtain the corresponding relation between the optical fiber length node on the track companion optical cable and the geographic coordinates along the track, namely, the target vibration signal acquired by the track companion optical cable corresponding to the track and the geographic coordinate information acquired by the mapping train running on the track are mapped based on time synchronization, so that the mapping between the optical fiber length node corresponding to the target vibration signal and the geographic coordinate information is realized.
In this embodiment, the corresponding relationship between the optical fiber length node on the track-concomitant optical cable and the geographical coordinates along the track is obtained, and specific reference may be made to embodiments 1 to 3.
S200, acquiring an optical fiber fault point on the track accompanying optical cable, and acquiring a geographic coordinate corresponding to the optical fiber fault point by combining the corresponding relation between the optical fiber length node on the track accompanying optical cable and the geographic coordinate along the track.
Compared with the existing mode of marking the optical fiber fault position by the optical fiber length, in the embodiment, after the optical fiber fault point, namely the optical fiber length node where the fault position is located, is obtained, the optical fiber fault point is further positioned through the geographic coordinates, so that the optical fiber fault position is clearly visible, and the secondary positioning of optical fiber overhaul is avoided.
In this embodiment, step S300 may be further configured to: and acquiring a scene picture associated with the geographic coordinates corresponding to the optical fiber fault point. Specifically, the scene picture is contained in the geographic coordinate information acquired by the mapping system.
In other words, in this embodiment, the mapping system obtains the corresponding relationship between the geographical coordinates along the track and the scene images, so after obtaining the geographical coordinates corresponding to the optical fiber fault points, the corresponding scene images are further obtained, so as to assist in positioning the optical fiber fault points through the scene images.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. The track companion optical cable fault point positioning method is characterized by comprising the following steps of:
s100, obtaining a corresponding relation between optical fiber length nodes on a track companion optical cable and geographic coordinates along the track;
s200, acquiring an optical fiber fault point on a track accompanying optical cable, and acquiring a geographic coordinate corresponding to the optical fiber fault point by combining a corresponding relation between an optical fiber length node on the track accompanying optical cable and a geographic coordinate along a track;
the step S100 specifically includes the following steps:
s101, marking a train carrying a mapping system as a mapping train, performing geographical mapping through the mapping system arranged on the mapping train, and collecting geographical coordinate information of a track in real time;
s102, collecting vibration signals generated by train running on a track through optical fibers in a track accompanying optical cable; marking a vibration signal corresponding to a mapping train as a target vibration signal, and acquiring an optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of a mapping system on the mapping train;
s103, associating geographic coordinate information acquired by the same mapping train at the same time with a generated target vibration signal to realize mapping between an optical fiber length node corresponding to the target vibration signal and the geographic coordinate information;
in step S102, the method for obtaining the optical fiber length node corresponding to the target vibration signal according to the length of the mapping train and the installation position of the mapping system includes: firstly, acquiring a length value of an optical fiber length node on a railway along line, and acquiring a vibration detection range corresponding to the target vibration signal; the optical fiber length node corresponding to the target vibration signal is a intercepting range taking the installation position of the mapping system on the mapping train as the center and taking the length value as the diameter in the corresponding vibration detection range; the length value is a fixed value.
2. The method for locating a fault point of a track-concomitant optical cable according to claim 1, further comprising step S300: and acquiring a scene picture associated with the geographic coordinates corresponding to the optical fiber fault point.
3. The method for locating fault points of a track-associated optical cable according to claim 2, wherein in step S100, the track is mapped along the track by a mapping system carried by a train to obtain geographic coordinates along the track; the mapping system also collects scene pictures and associates geographic coordinates collected at the same time with the scene pictures.
4. The track companion cable fault point positioning method according to claim 1, wherein in step S103, a target track is selected first, and geographic coordinate information acquired when a mapping train runs on the target track is correlated with a generated target vibration signal; the target track is a track between two adjacent sites along the railway.
5. The method for locating a fault point of a track-concomitant optical cable according to claim 4, wherein in step S102, when a plurality of trains run in the same direction on a target track, the arrangement sequence of the mapping trains is first obtained according to the departure time of the station, and then the target vibration signals of the corresponding mapping trains on the track-concomitant optical cable are obtained according to the arrangement sequence.
6. A track companion cable fault point location system comprising: a memory module for storing a computer program;
the processing module is connected to the storage module, and the processing module is configured to implement the track-concomitant optical cable fault point positioning method according to any one of claims 1 to 5 when executing the computer program.
7. A memory, wherein a computer program is stored in the memory, which when executed, implements the track-companion cable fault point positioning method according to any one of claims 1 to 5.
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| CN105187121A (en) * | 2015-06-18 | 2015-12-23 | 天津纤测道客科技发展有限公司 | Communication optical cable fault point surface position location method and system |
| CN106828543A (en) * | 2017-03-13 | 2017-06-13 | 北京众成探知信息技术有限公司 | A kind of optical fiber distributed type train monitoring system |
| CN107329933B (en) * | 2017-07-14 | 2020-06-19 | 北京知觉科技有限公司 | Fault detection method and device based on optical fiber sensing vibration signal |
| CN108875684A (en) * | 2018-06-29 | 2018-11-23 | 电子科技大学 | Train operation state method for parameter estimation based on optical fiber sensing time-frequency figure processing |
| CN108880668A (en) * | 2018-07-30 | 2018-11-23 | 北京交通大学 | A kind of railway optical cable real-time monitoring system for state and method |
| CN109347547A (en) * | 2018-11-26 | 2019-02-15 | 北京航天易联科技发展有限公司 | A kind of communication cable failure geographical location enquiry positioning method |
| CN111006849B (en) * | 2019-12-24 | 2021-11-09 | 中石化石油工程技术服务有限公司 | Method and system for judging laying state of oil-gas pipeline accompanying optical cable |
| CN111830546A (en) * | 2020-07-20 | 2020-10-27 | 北京天润海图科技有限公司 | Outdoor railcar landmark deployment method |
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Effective date of registration: 20230607 Address after: 236000 No.13, dingda Road, industrial park, Yingquan District, Fuyang City, Anhui Province Applicant after: ANHUI HUIYI COMMUNICATION SCIENCE Co.,Ltd. Address before: 236000 Building 6, No. 13, Dingda Road, Zhongshi Street, Yingquan District, Fuyang City, Anhui Province Applicant before: Anhui Weiquan Intelligent Technology Co.,Ltd. |
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Application publication date: 20210430 Assignee: Anhui Honghong Photoelectric Technology Co.,Ltd. Assignor: ANHUI HUIYI COMMUNICATION SCIENCE Co.,Ltd. Contract record no.: X2023980038308 Denomination of invention: A method, system, and memory for locating fault points of track accompanying optical cables Granted publication date: 20230704 License type: Common License Record date: 20230726 |