A method and system for tunnel cable drop-off monitoring and positioning

Abstract

The application discloses a tunnel cable leakage off monitoring and positioning method and system, comprising the following steps: pasting RFID tags on the wall, receiving RFID identification signals sent from the transmitter in a polling mode through the cable leakage, and transmitting the generated RFID feedback signals and the ID number to the monitoring unit; a first data processing unit calculates the position of each RFID tag according to the RFID feedback signals and the ID number received by the monitoring unit, generates an original table composed of the ID number and the position information of the RFID tag, and sends the original table to a background management terminal; finally, the background management terminal judges whether the cable leakage is off through the original table and determines the specific position of the cable leakage. The application can monitor the cable leakage in real time, is suitable for monitoring various cable leakage off situations, and realizes automatic calibration of the initial position of the RFID tag, so that address information does not need to be manually written, and the cable leakage positioning method is more simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of real-time monitoring technology for leaky cables in wireless communication, and in particular to a method and system for monitoring and locating leaky cables in tunnels. Background Technology

[0002] In recent years, with the rapid development of the rail transit industry, leaky cables have been widely used to solve communication problems in tunnels. When a train passes through a tunnel at high speed, it compresses air, creating a piston effect that causes the leaky cable and the slings securing it to vibrate. Over time, this can lead to the leaky cable and slings detaching, affecting communication and endangering train operation. Therefore, it is necessary to monitor and locate leaky cable detachments.

[0003] Currently, there are three main methods for monitoring cable detachment in tunnels. The first is manual inspection, which is the most traditional method. Personnel are sent into the tunnel at regular intervals to check for cable detachment. The second is image processing, where an inspection vehicle travels along the track and takes images of the cable detachment. Algorithms are used to perform edge detection on the images, and the results are used to determine whether the cable detaches. The third is RFID tag identification, where RFID tags are attached to the lifting device, and address information is written into the tags. A reader reads the information returned by the RFID tags to determine whether the cable detaches and where it has detached.

[0004] The existing technologies described above have the following drawbacks: The first method has low inspection efficiency, requires a large amount of manpower, and is intermittent, so it cannot monitor leaky cables in real time; The second method improves inspection efficiency, but the algorithm is cumbersome in image processing and is prone to false detections, and it also cannot monitor leaky cables in real time; The third method can monitor leaky cables in real time, but it still has the following problems: 1. When the RFID tag is embedded in the hanging device, it cannot detect that the leaky cable has fallen off when the hanging device is completely removed from the wall; 2. There is a leaky cable hanging device every 1 meter, so a large number of RFID tags need to be pasted, which is costly, and writing address information into each tag also requires a lot of work. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the aforementioned existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a method and system for monitoring and locating leaky cables in tunnels, which solves the problems of low efficiency and inaccurate detection in existing leaky cable detection methods.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] In a first aspect, the present invention provides a method for monitoring and locating leaky cables in tunnels, comprising:

[0010] The RFID tag is affixed to the wall and receives the RFID identification signal sent from the transmitter in a polling manner through a leaky cable. The generated RFID feedback signal and its own ID number are then transmitted to the monitoring unit.

[0011] The first data processing unit calculates the location of each RFID tag based on the RFID feedback signal and ID number received by the monitoring unit, and generates a raw table consisting of the ID number and the location information of the RFID tag, and sends the raw table to the back-end management terminal.

[0012] The second data processing unit receives the RFID feedback signals and ID numbers collected in real time by the monitoring unit, and transmits the sorted ID numbers to the back-end management terminal. Finally, the back-end management terminal uses the original table to determine whether the leaky cable has fallen off and to determine the specific location where the leaky cable has fallen off.

[0013] As a preferred embodiment of the method for monitoring and locating leaky cables in tunnels according to the present invention, wherein:

[0014] It also includes the following steps:

[0015] Affix RFID tags to the wall at equal intervals;

[0016] The leaky cable is periodically sent with a certain frequency and power of RFID identification signal with RFID tag ID number in a polling manner.

[0017] After transmission loss and coupling loss, the RFID tag receives the RFID identification signal and sends an RFID feedback signal to the leaky cable, which also includes the RFID tag's ID number.

[0018] The RFID tag's initial position is automatically calibrated. Based on the first RFID feedback signal collected, the distance between the RFID tag and the transmitter is calculated. The calculated distance corresponds to the ID number. The ID numbers are sorted according to the signal strength of the feedback signal and initial positioning is performed to generate the original table.

[0019] The collected IDs will be compared with the IDs in the original table.

[0020] If the ID number collected later is the same as the ID number in the original table, it means that the communication is normal and there is no missing cable. If the ID number collected later is different from the ID in the original table, it means that there is a missing cable.

[0021] Compared to the ID numbers in the original table, the missing ID number in the real-time collected ID number data is the ID number corresponding to the RFID tag at the point where the leaky cable detached. By substituting the ID number into the original table, the specific location where the leaky cable detached can be found.

[0022] As a preferred embodiment of the method for monitoring and locating leaky cables in tunnels as described in this invention, the specific steps for calculating the distance between the RFID tag and the transmitter are as follows: based on the RFID feedback signal, the signal attenuates linearly when transmitted through the leaky cable at the same frequency. Utilizing this linear attenuation characteristic, the distance between each RFID tag and the transmitter is calculated.

[0023] As a preferred embodiment of the method for monitoring and locating leaky cables in tunnels according to the present invention, the step of confirming the location of the leaky cable detachment includes the following steps:

[0024] The real-time collected ID number data is compared with the ID number in the original table. The missing ID number in the real-time collected ID number data is the ID number corresponding to the RFID tag at the point where the leaky cable fell off.

[0025] The original table consists of the ID numbers of all RFID tags and the location of the RFID tags to which the ID numbers belong. Therefore, by looking up the original table based on the ID number of the detached point, the specific location where the leaky cable detached can be determined.

[0026] As a preferred embodiment of the method for monitoring and locating leaky cables in tunnels as described in this invention, the RFID tags are large-sized tags, affixed to the wall at equal intervals, and 5 cm away from the leaky cable; they are used to receive the identification signal transmitted from the leaky cable and transmit the generated feedback signal to the leaky cable, and each RFID tag has a unique ID number.

[0027] As a preferred embodiment of the method for monitoring and locating leaky cables in tunnels as described in this invention, the transmitter sends an RFID identification signal with an ID number, which can only be received and responded to by RFID tags with the same ID number. A specific identification signal is sent to each RFID tag in turn using a polling method, and interference between signals at the same frequency is avoided when the monitoring unit receives the RFID feedback signal.

[0028] Secondly, the present invention provides a system for monitoring and locating leaky cables in tunnels, comprising:

[0029] The receiving module is used to receive ID number data generated in real time by the second data processing unit;

[0030] The analysis module compares the real-time generated ID number data with the original table generated by the first data processing unit. Based on the comparison results, it analyzes the data. If the IDs in the original table do not correspond one-to-one with the real-time generated ID number data, it indicates that a leaky cable has fallen off. The missing ID number in the real-time ID number data compared with the IDs in the original table is the location where the leaky cable has fallen off.

[0031] The display module is used to show the analysis results. When the leaky cable comes loose, it displays the ID number of the RFID tag and the specific location where it came loose, which is convenient for maintenance personnel to carry out repairs.

[0032] As a preferred embodiment of the tunnel cable detachment monitoring and location system described in this invention, the transmitter is used to send RFID identification signals to the cable. It periodically sends RFID identification signals with ID numbers through polling and can control the sending frequency and power.

[0033] The monitoring unit is used to receive the RFID feedback signal transmitted from the leaky cable, read the ID number of the RFID tag, and transmit the RFID feedback signal and ID number to the first data processing unit and the second data processing unit.

[0034] The first data processing unit receives the RFID feedback signal and ID number read for the first time by the monitoring unit, calculates the distance between the RFID tag and the transmitter, sorts the ID numbers according to the signal strength of the feedback signal and performs initial positioning, generates the original table, and transmits the original table to the back-end management terminal.

[0035] The second data processing unit receives RFID feedback signals and ID numbers sent in real time by the monitoring unit, sorts the ID numbers according to the signal strength of the feedback signals, and transmits the sorted ID numbers to the back-end management terminal.

[0036] The back-end management terminal determines the precise location of the leaky cable detachment by analyzing the original table transmitted by the first data processing unit and the ID number transmitted by the second data processing unit.

[0037] Thirdly, the present invention provides a computing device, comprising:

[0038] Memory, used to store programs;

[0039] A processor for executing the computer-executable instructions, which, when executed by the processor, implement the steps of the method for monitoring and locating leaky cables in the tunnel.

[0040] Fourthly, the present invention provides a computer-readable storage medium comprising: when the program is executed by a processor, the steps of implementing the method for monitoring and locating leaky cables in tunnels.

[0041] The beneficial effects of this invention are:

[0042] 1. Using large-size RFID tags can improve tag reading and identification speed and sense more energy; by attaching RFID tags to the wall at certain intervals, there is no need to implant tags on the hanging equipment, which reduces the amount of RFID tags used and saves costs. Even if the entire cable hanging equipment falls off, it can still be detected because the tags are attached to the wall.

[0043] 2. Sending RFID identification signals with ID numbers to each RFID tag sequentially in a polling manner helps to distinguish which RFID tag generated the signal when the monitoring unit receives RFID feedback signals of the same frequency, while avoiding interference between signals at the same frequency.

[0044] 3. The location of the RFID tag can be calculated by the RFID tag's ID number and the attenuation of the RFID feedback signal, realizing automatic initial position calibration of the RFID tag. This eliminates the need for manual writing of address information for each RFID tag, greatly reducing the workload. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0046] Figure 1 This is a basic flowchart illustrating a method for monitoring and locating leaky cables in a tunnel, provided in one embodiment of the present invention.

[0047] Figure 2 This is an overall block diagram of a method for monitoring and locating leaky cables in tunnels, provided in one embodiment of the present invention.

[0048] Figure 3 A system framework diagram of a background management terminal for a method for monitoring and locating leaky cables in tunnels, provided in one embodiment of the present invention; Detailed Implementation

[0049] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0050] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0051] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0052] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0053] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] Example 1

[0056] Reference Figure 1-3 As one embodiment of the present invention, a method for monitoring and locating leaky cables in tunnels is provided, such as... Figure 1 As shown, it includes the following steps:

[0057] S1: Affix the RFID tag to the wall, receive the RFID identification signal sent from the transmitter in a polling manner through the leaky cable, and transmit the generated RFID feedback signal and its own ID number to the monitoring unit;

[0058] Furthermore, the following steps are also included:

[0059] A1: Affix RFID tags to the wall at equal intervals;

[0060] A2: Periodically send RFID identification signals with RFID tag ID numbers at a certain frequency and power to the leaky cable in a polling manner;

[0061] A3: After transmission loss and coupling loss, the RFID tag receives the RFID identification signal and sends an RFID feedback signal to the leaky cable, which also includes the RFID tag's ID number;

[0062] A4: Automatic initial position calibration of RFID tags. Based on the first RFID feedback signal collected, the distance between the RFID tag and the transmitter is calculated. The calculated distance corresponds to the ID number. The ID numbers are sorted according to the signal strength of the feedback signal and initial positioning is performed to generate the original table.

[0063] Furthermore, firstly, the transmission frequency is selected. The transmission loss coefficient α is related to the transmission frequency and the leaky cable material; the coupling loss is related to the leaky cable and is known.

[0064]

[0065] Where α1 represents the conductor loss coefficient, α2 represents the dielectric loss coefficient, α3 represents the radiation loss coefficient, and f represents the transmission frequency (MHz).

[0066] L s =α·z i

[0067] Among them, L s Z represents transmission loss, α is the transmission loss coefficient, and Z i The desired distance is the distance from the i-th tag to the transmitter.

[0068] R s,i =R F -2L s -L c =R F -2·α·z i -L c

[0069] Among them, R s,i R is the magnitude of the feedback signal finally received from the i-th tag. F L represents the size of the transmitted signal. C This is the coupling loss;

[0070] z i =(R F -R s,i -Lc ) / 2α

[0071] The distance from the i-th tag to the transmitter can be calculated using the formula above.

[0072] Based on the characteristic that signals attenuate linearly during leaky cable transmission at the same frequency, the distance of the first tag can be calculated using the above formula, and the distance of the remaining tags can be deduced, simplifying the subsequent calculation steps.

[0073] Δz=(R s,i -R s,i+1 ) / 2α

[0074] Where ΔZ is the distance between adjacent labels; R s,i R represents the magnitude of the received signal from the i-th tag. s,i+1 The value represents the magnitude of the signal received from the (i+1)th tag. The larger the index, the farther away it is from the transmitter.

[0075] z i+1 =z i +Δz

[0076] Among them, Z i+1 This is the distance from the transmitter to the (i+1)th tag.

[0077] A5: Compare the IDs collected later with the IDs in the original table.

[0078] A6: If the ID number collected later is the same as the ID number in the original table, it means that the communication is normal and there is no missing cable. If the ID number collected later is different from the ID in the original table, it means that there is a missing cable.

[0079] A7: Compared to the ID number in the original table, the missing ID number in the real-time collected ID number data is the ID number corresponding to the RFID tag at the point where the leaky cable detached. Substitute the ID number into the original table to find the specific location where the leaky cable detached.

[0080] Furthermore, the RFID tags in A1 are passive, large-sized tags, affixed to the wall at equal intervals, 5 centimeters away from the leaky cable; they are used to receive the identification signal transmitted from the leaky cable and transmit the generated feedback signal back to the leaky cable. Each RFID tag has a unique ID (identification code) number.

[0081] Furthermore, the frequency sent to the leaky cable should be high and different from the frequencies used by other signals in the leaky cable to avoid interference caused by the same frequency. The higher the frequency, the greater the signal attenuation in the leaky cable, and the more accurate the RFID tag location calculated using A4 data. The transmission power must be sufficient to ensure that the signal energy after transmission loss and coupling loss in the leaky cable can still be received by the monitoring unit.

[0082] Furthermore, each RFID tag has its own unique ID number, eliminating the need for manual input. When an RFID tag receives an RFID identification signal, it is activated and subsequently sends an RFID feedback signal to the leaky cable.

[0083] Furthermore, in A5, when the leaky cable comes off, the distance between the RFID tag and the leaky cable increases, and the RFID tag cannot communicate with the leaky cable. Therefore, the ID number of the tag will not be collected afterward. Thus, by comparing the ID number with the original table, it can be determined whether the leaky cable has come off.

[0084] Furthermore, the specific process for confirming the location of the leaky cable detachment in A5 is as follows:

[0085] 1.1: Compare the ID number data collected in real time with the ID number in the original table. The missing ID number in the ID number data collected in real time is the ID number corresponding to the RFID tag at the point where the leaky cable fell off.

[0086] 1.2: The original table consists of the ID number of all RFID tags and the location of the RFID tag to which the ID number belongs. Therefore, by looking up the original table based on the ID number of the detached point, the specific location of the leaky cable can be determined.

[0087] Furthermore, the first data processing unit calculates the distance between the RFID tag and the transmitter by: based on the RFID feedback signal, the feedback signal attenuation of the RFID tag at different locations is different, and the signal attenuation changes linearly at the same frequency. Based on the characteristics of linear change, the position of all RFID tags is calculated.

[0088] Furthermore, in a leaky cable, signal attenuation at the same frequency exhibits a linear transformation, with the attenuation becoming more severe over greater distances. Therefore, the received feedback signals also exhibit a linear distribution, and the location of each RFID tag is calculated based on these feedback signals. Each RFID feedback signal used for location calculation corresponds to an ID number. The ID numbers are sorted from strongest to weakest based on signal strength; a stronger received signal indicates a closer RFID tag. The sorted ID numbers and their corresponding RFID tag locations are then integrated to generate an original table.

[0089] Furthermore, RFID identification signals are sent periodically, so RFID feedback signals and ID numbers are received periodically. If a cable detaches at a certain point, no RFID feedback signal will be generated, and therefore no ID number can be identified. Therefore, comparing the real-time collected ID number data with the ID numbers in the original table can determine the status of the cable detachment. If the ID numbers in the original table are the same as the real-time generated ID numbers, it means there is no cable detachment. If the ID numbers in the original table are different from the real-time generated ID numbers, it means there is a cable detachment. The missing ID number in the real-time collected ID number data compared to the original table is the ID number corresponding to the RFID tag at the point of cable detachment. Substituting this ID number into the original table allows you to find the specific location of the cable detachment.

[0090] S2: The first data processing unit calculates the location of each RFID tag based on the RFID feedback signal and ID number received by the monitoring unit, generates an original table consisting of the ID number and the location information of the RFID tag, and sends the original table to the back-end management terminal.

[0091] S3: The second data processing unit receives the RFID feedback signal and ID number collected in real time by the monitoring unit, and transmits the sorted ID number to the back-end management terminal. Finally, the back-end management terminal uses the original table to determine whether the leaky cable has fallen off and to determine the specific location where the leaky cable has fallen off.

[0092] Furthermore, specifically, the leaky coaxial cable, also known as a leaky cable, is fixed to the tunnel wall using a cable hanger. It transmits electromagnetic energy to the external environment through slots in its outer conductor and can also receive external energy, solving the communication difficulties within the tunnel. RFID tags are affixed to the wall at equal intervals along the leaky cable. These tags receive RFID identification signals from the transmitter and transmit the resulting feedback signal along with their own ID number to the monitoring unit. The transmitter periodically sends RFID identification signals with ID numbers using a polling method; only RFID tags with the same ID number can receive and respond. The first data processing unit calculates the location of the RFID tag corresponding to each RFID feedback signal based on the initial RFID feedback signal and ID number collected by the monitoring unit. It then sorts the ID numbers and generates a raw table containing the ID numbers and their corresponding RFID tag location information, sending the raw table to the backend management terminal. The second data processing unit receives the real-time RFID feedback signals and ID numbers collected by the monitoring unit, sorts only the RFID tag ID numbers, and transmits the sorted ID numbers to the backend management terminal. Finally, the back-end management terminal is used to determine whether the leaky cable has come loose and to pinpoint the exact location of the loose cable, and then staff are notified to go and repair it.

[0093] This embodiment also provides a system for monitoring and locating leaky cables in tunnels, such as... Figure 3As shown, it includes:

[0094] The receiving module is used to receive ID number data generated in real time by the second data processing unit;

[0095] The analysis module compares the real-time generated ID number data with the original table generated by the first data processing unit. Based on the comparison results, it analyzes the data. If the IDs in the original table do not correspond one-to-one with the real-time generated ID number data, it indicates that a leaky cable has fallen off. The missing ID number in the real-time ID number data compared with the IDs in the original table is the location where the leaky cable has fallen off.

[0096] The display module is used to show the analysis results. When the leaky cable comes loose, it displays the ID number of the RFID tag and the specific location where it came loose, which is convenient for maintenance personnel to carry out repairs.

[0097] Furthermore, such as Figure 2 As shown, it also includes:

[0098] The transmitter is used to send RFID identification signals to the leaky cable. It periodically sends RFID identification signals with ID numbers through polling and can control the transmission frequency and power.

[0099] The monitoring unit is used to receive the RFID feedback signal transmitted from the leaky cable, read the ID number of the RFID tag, and transmit the RFID feedback signal and ID number to the first data processing unit and the second data processing unit.

[0100] The first data processing unit receives the RFID feedback signal and ID number read for the first time by the monitoring unit, calculates the distance between the RFID tag and the transmitter, sorts the ID numbers according to the signal strength of the feedback signal and performs initial positioning, generates the original table, and transmits the original table to the back-end management terminal.

[0101] The second data processing unit receives RFID feedback signals and ID numbers sent in real time by the monitoring unit, sorts the ID numbers according to the signal strength of the feedback signals, and transmits the sorted ID numbers to the back-end management terminal.

[0102] The back-end management terminal determines the precise location of the leaky cable detachment by analyzing the original table transmitted by the first data processing unit and the ID number transmitted by the second data processing unit.

[0103] Furthermore, this also includes:

[0104] Memory, used to store programs;

[0105] A processor for loading the program to execute the method for monitoring and locating leaky cables in tunnels.

[0106] This embodiment also provides a computer-readable storage medium storing a program that, when executed by a processor, implements the method for monitoring and locating leaky cables in tunnels.

[0107] The storage medium proposed in this embodiment and the method for monitoring and locating leaky cables in tunnels proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0108] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0109] Example 2

[0110] Referring to Table 1, an embodiment of the present invention provides a method for monitoring and locating leaky cables in tunnels. To verify its beneficial effects, a comparison of various schemes is provided.

[0111] Method 1 is manual inspection, which is the most traditional method. People are sent into the tunnel at certain time intervals to check for cable leaks.

[0112] Method 2 involves image processing. The inspection vehicle travels along the track and takes images of the leaky cable. An algorithm is used to perform edge detection on the images, and the results of the edge detection are used to determine whether the leaky cable has come loose.

[0113] Method 3 involves RFID tag identification. An RFID tag is attached to the sling and the address information is written into the tag. The information returned by the RFID tag is read by a card reader to determine whether the leaky cable has come loose and where it has come loose.

[0114] Table 1 Comparison Table

[0115]

[0116]

[0117] As can be seen from Table 1, our handling and classification of tunnel cable detachment monitoring are quite detailed. By using large-size RFID tags, we can improve the tag reading and identification speed and sense more energy. By attaching RFID tags to the wall at certain intervals, there is no need to implant tags on the hoisting equipment, which reduces the number of RFID tags used and saves costs. The position of the tag can be calculated by the ID number of the RFID tag and the attenuation of the RFID feedback signal, realizing automatic calibration of the initial position of the RFID tag. There is no need to manually write address information for each RFID tag, which greatly reduces the workload.

[0118] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for monitoring and locating leaky cables in tunnels, characterized in that, include: The RFID tag is affixed to the wall and receives the RFID identification signal sent from the transmitter in a polling manner through a leaky cable. The generated RFID feedback signal and its own ID number are then transmitted to the monitoring unit. The first data processing unit calculates the location of each RFID tag based on the RFID feedback signal and ID number received by the monitoring unit, and generates a raw table consisting of the ID number and the location information of the RFID tag, and sends the raw table to the back-end management terminal. The second data processing unit receives the RFID feedback signal and ID number collected in real time by the monitoring unit, and transmits the sorted ID number to the back-end management terminal. Finally, the back-end management terminal uses the original table to determine whether the leaky cable has fallen off and to determine the specific location where the leaky cable has fallen off. Affix RFID tags to the wall at equal intervals; The RFID tag is 5 centimeters away from the leaky cable; The real-time generated ID number data is compared with the original table generated by the first data processing unit. The comparison results are analyzed. If the ID number in the original table does not correspond one-to-one with the real-time generated ID number data, it indicates that a leaky cable has fallen off. The missing ID number in the real-time ID number data compared with the ID number in the original table is the location where the leaky cable has fallen off.

2. The method for monitoring and locating leaky cables in tunnels as described in claim 1, characterized in that, It also includes the following steps: The leaky cable is periodically sent with a certain frequency and power of RFID identification signal with RFID tag ID number in a polling manner. After transmission loss and coupling loss, the RFID tag receives the RFID identification signal and sends an RFID feedback signal to the leaky cable, which also includes the RFID tag's ID number. The RFID tag's initial position is automatically calibrated. Based on the first RFID feedback signal collected, the distance between the RFID tag and the transmitter is calculated. The calculated distance corresponds to the ID number. The ID numbers are sorted according to the signal strength of the feedback signal and initial positioning is performed to generate the original table. The collected ID numbers are compared with the IDs in the original table. If the collected ID number is the same as the ID number in the original table, it means that the communication is normal and there is no missing cable. If the collected ID number is different from the ID in the original table, it indicates that a leaky cable has come loose. Compared to the ID numbers in the original table, the missing ID number in the real-time collected ID number data is the ID number corresponding to the RFID tag at the point where the leaky cable detached. By substituting the ID number into the original table, the specific location where the leaky cable detached can be found.

3. The method for monitoring and locating leaky cables in tunnels as described in claim 2, characterized in that: The calculation of the distance between the RFID tag and the transmitter is based on the RFID feedback signal. At the same frequency, the signal attenuates linearly when transmitted through the leaky cable. By utilizing this linear attenuation characteristic, the distance between each RFID tag and the transmitter is calculated.

4. The method for monitoring and locating leaky cables in tunnels as described in claim 3, characterized in that: Determining the location of the leaky cable detachment includes the following steps: The real-time collected ID number data is compared with the ID number in the original table. The missing ID number in the real-time collected ID number data is the ID number corresponding to the RFID tag at the point where the leaky cable fell off. The original table consists of the ID numbers of all RFID tags and the location of the RFID tags to which the ID numbers belong. The specific location where the leaky cable detached can be found by looking up the original table based on the ID number of the detached location.

5. The method for monitoring and locating leaky cables in tunnels as described in claim 4, characterized in that: The RFID tags are large-sized and affixed to the wall at equal intervals; they are used to receive identification signals transmitted from the leaky cable and transmit the resulting feedback signals back to the leaky cable. Each RFID tag has a unique ID number.

6. The method for monitoring and locating leaky cables in tunnels as described in claim 5, characterized in that: The transmitter sends RFID identification signals with ID numbers, which can only be received and responded to by RFID tags with the same ID number. A specific identification signal is sent to each RFID tag in turn by polling, so as to avoid interference between signals at the same frequency when the monitoring unit receives the RFID feedback signal.

7. A system for monitoring and locating leaky cables in tunnels, characterized in that, The application of the method described in claim 1, wherein the background management terminal includes: The receiving module is used to receive ID number data generated in real time by the second data processing unit; The analysis module compares the real-time generated ID number data with the original table generated by the first data processing unit. Based on the comparison results, it analyzes the data. If the ID number in the original table does not correspond one-to-one with the real-time generated ID number data, it indicates that a leaky cable has fallen off. The missing ID number in the real-time ID number data compared with the ID number in the original table is the location where the leaky cable has fallen off. The display module is used to show the analysis results. When the leaky cable comes loose, it displays the ID number of the RFID tag and the specific location where it came loose, which is convenient for maintenance personnel to carry out repairs.

8. The system for monitoring and locating leaky cables in tunnels as described in claim 7, characterized in that: The transmitter is used to send RFID identification signals to the leaky cable. It periodically sends RFID identification signals with ID numbers through polling and controls the transmission frequency and power itself. The monitoring unit is used to receive the RFID feedback signal transmitted from the leaky cable, read the ID number of the RFID tag, and transmit the RFID feedback signal and ID number to the first data processing unit and the second data processing unit. The first data processing unit receives the RFID feedback signal and ID number read for the first time by the monitoring unit, calculates the distance between the RFID tag and the transmitter, sorts the ID numbers according to the signal strength of the feedback signal and performs initial positioning, generates the original table, and transmits the original table to the back-end management terminal. The second data processing unit receives RFID feedback signals and ID numbers sent in real time by the monitoring unit, sorts the ID numbers according to the signal strength of the feedback signals, and transmits the sorted ID numbers to the back-end management terminal. The back-end management terminal determines the precise location of the leaky cable detachment by analyzing the original table transmitted by the first data processing unit and the ID number transmitted by the second data processing unit.

9. An electronic device, characterized in that, include: Memory, used to store programs; A processor for loading the program to execute the method for monitoring and locating leaky cables in tunnels as described in any one of claims 1-6.

10. A computer-readable storage medium storing a program, characterized in that, When the program is executed by the processor, it implements the method for monitoring and locating leaky cables in tunnels as described in any one of claims 1-6.

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