Noise detection method and system for laid cable

Abstract

The invention discloses a noise detection method and system for a laid cable. The system comprises a structure identification module, a test point laying module, a signal processing module, a verification path construction module, a noise analysis module and a data processing module. According to the system, a segmented cable connection structure and test point layout are determined, a connection channel and a test physical cable with the same signal isolation are adopted to construct a simulation environment, a first standard test signal and a second standard test signal are respectively applied, a feedback signal is synchronously sampled, and random traversal verification of multiple types of verification paths is combined. And separating background noise signals outside the reference phase difference, and finally calibrating and outputting a signal-noise level characterization value. The system solves the problems that in a traditional detection method, physical structure interference is difficult to separate, and noise source positioning is not accurate, accurate detection and multi-dimensional verification of segmented cable noise are achieved, and the system is suitable for noise evaluation and maintenance of a complex laying cable system.

Description

Technical Field

[0001] The present invention relates to the field of processing technologies, and particularly to a method and system for detecting the noise of paved cables. Background Art

[0002] In the fields of power transmission and signal transmission, the noise level of a paved cable system directly affects the transmission stability and reliability. Traditional cable noise detection methods usually adopt an integral detection mode, making it difficult to accurately locate the noise sources and signal-to-noise levels of each segmented cable. In the prior art, there are the following technical defects: First, it is impossible to effectively separate the influence of the physical differences of the connection channels and the noise of the cable itself, resulting in large errors in the detection results; Second, there is a lack of a targeted test scheme for the connection structure characteristics of segmented cables, making it difficult to simulate the noise coupling situation in the actual paved environment; Third, in a complex cable network, it is impossible to accurately locate the noise source through multi-path verification, and a standardized noise level characterization system has not been established. With the increasing complexity of cable systems and the demand for high reliability, there is an urgent need for a detection system that can accurately detect the noise of segmented cables, eliminate physical structure interference, and achieve multi-dimensional verification. Summary of the Invention

[0003] In view of the above problems, the present invention provides a method and system for detecting the noise of paved cables.

[0004] The object of the present invention is achieved by the following technical solutions: In the first aspect of the present invention, a method for detecting the noise of paved cables is provided, including the following steps: S1. Determine the connection structure of each segmented cable in the paved cable system and the positions of its connection points; S2. Determine at least one signal-to-noise test point on each of the segmented cables, connect the signal-to-noise test points through a connection channel, and set the connection channels between the signal-to-noise test points to have the same signal isolation degree, and the connection mode of the connection channel is the same as the connection structure of each segmented cable; S3. Apply a first standard test signal to each signal-to-noise test point of each segmented cable in turn, isolate the connection channel and synchronously sample the first feedback test signal received by other signal-to-noise test points during each round of testing; S4. Apply a second standard test signal to the signal-to-noise test points of each segmented cable in turn, isolate each segmented cable and synchronously sample the second feedback test signal received by other signal-to-noise test points during each round of testing; S5. According to the first feedback signal and the second feedback signal, separate the signal difference between the two, extract the signal other than the reference phase difference as the background noise signal, and determine the signal-to-noise level characterization value of each segmented cable; S6. Store and / or output the signal-to-noise level characterization value of each segmented cable.

[0005] As a preferred method, in S2: Set a signal-to-noise test point at the connection point of each section of the segmented cable; Connect it to the signal-to-noise test point through a test physical cable with a preset length, and the wire diameter and material of the test physical cable are the same as those of the corresponding segmented cable; The connection channel is a physical simulation that does not include the test physical cable and has the same physical connection structure as the paved cable system. The test physical cable is set to be connected to the segmented cable through the connection channel and / or cross adjacent segmented cables.

[0006] As a preferred method, the physical test cable is also set to have an impedance load with a preset variable range at its connection load.

[0007] As a preferred method, in S6, the signal outside the reference phase difference is extracted as the background noise signal, and the specific setting is as follows: Compare the first feedback test signal and the second feedback test signal obtained at other test points when the first standard test signal and the second standard test signal are applied to the same target segmented cable; Measure the phase difference caused by the fixed delay of the test signal through the channel or the physical difference between the connection channel and the segmented cable, and calculate the background noise of the connection channel at the same time. Take the phase difference and the background noise as the reference phase difference; Identify the remaining difference signal as the background noise signal from the path where the target segmented cable is located; Calculate and determine the signal-to-noise level characterization value of the target segmented cable based on the relationship between the intensity of the remaining difference signal and the intensity of the standard test signal.

[0008] As a preferred method, before step S5, the following steps are further included: While applying the second standard test signal to the target segmented cable, selectively inject interference signals with known characteristics into one or more adjacent non-target segmented cables; Monitor the stability change of the second feedback test signal of the target segmented cable when the interference signal is applied and not applied; If the stability change exceeds the preset allowable fluctuation range, return to step S4 to obtain new second feedback test signal data until the stability change is within the preset allowable fluctuation range.

[0009] As a preferred method, when performing S3 and S4, both include: Selectively disconnect the communication path of at least one adjacent segmented cable of the target segmented cable to construct a verification path, which includes: Only retain the path between the target segmented cable and the directly adjacent segmented cable, directly connect to the distal segmented cable by skipping the intermediate segmented cable, and the hybrid path of parallel testing the physical cable and the connection channel; Verify each verification path in a random order and traverse each segmented cable to perform verification.

[0010] As a preferred method, under the same test signal, when comparing the verification paths constructed when verifying different segmented cables, compare the attenuation differences between the first feedback signal and the second feedback signal measured by each verification path; if the attenuation difference between adjacent paths exceeds the preset value, mark that there is abnormal noise coupling in this segmented cable; If a hybrid path of parallel testing the physical cable and the connection channel is constructed and there is an attenuation difference exceeding the preset value, synchronously inject a pulse interference signal into the non-target segmented cable, check the residue of the pulse interference signal in the hybrid path, and if the residue exceeds the preset value, adjust the impedance load at the load of the physical test cable to be within the preset value; Disconnect the physical test cable and re-perform signal acquisition of S3 - S4 on each verification path, Compare the fluctuation ranges of the background noise signals measured twice, and use this signal fluctuation range as the calibration value of the signal-to-noise level characterization value under the hybrid path to obtain the calibration value of the signal-to-noise level characterization value.

[0011] As a preferred method, summarize the signal-to-noise level characterization values of the same segmented cable under each verification path, calculate the standard deviation of the signal-to-noise level characterization values under each verification path, and if the standard deviation exceeds the threshold, use the calibrated characterization value of the hybrid path for storage and / or output.

[0012] In the second aspect of the present invention, a noise detection system for paved cables is provided, including: Including: A structure recognition module for determining the connection structure and connection point position of the segmented cable; A test point layout module for setting signal-to-noise test points on the segmented cable and connecting each test point through a connection channel with the same connection structure as the segmented cable, and the connection channel has the same signal isolation degree; the test point layout module also includes setting test points at the connection points and connecting them through test physical cables with the same material as the corresponding segmented cable, and a variable impedance is set at the load of the test physical cable; A signal processing module for applying first and second standard test signals to the test points, synchronously sampling the feedback signals of other test points after isolating the connection channel and the segmented cable respectively; the signal processing module also includes injecting an interference signal and monitoring the stability of the feedback signal when applying the second standard test signal; A verification path construction module, which is used to disconnect adjacent communication paths of a target segmented cable, construct a verification path including direct connection, cross-connection and hybrid paths, and randomly traverse and verify; A noise analysis module, which is used to compare the differences in feedback signals, extract background noise signals after determining the reference phase difference, and calculate the signal-to-noise level characterization value; it is also used to compare the attenuation differences of the verification paths, mark anomalies and calibrate the hybrid paths; A data processing module, which is used to summarize the signal-to-noise level characterization values, store and / or output them after calibration.

[0013] The beneficial effects of the present invention are as follows: The method provided by the present invention realizes the accurate positioning of the noise source through the corresponding design of the segmented cable connection structure and the test point layout. First, clarify the connection structure and connection point positions of each segmented cable, and then set signal-to-noise test points at the connection points. This test point layout based on the physical structure enables the test signal to directly reflect the actual connection status of each segmented cable. Since the connection channel adopts the same physical simulation structure as the paved cable system, and the material and wire diameter of the tested physical cable are the same as those of the corresponding segmented cable, it ensures a high degree of matching between the test environment and the actual operating environment, avoiding noise detection deviations caused by differences in test conditions, and thus can accurately capture the noise characteristics of each segmented cable in the actual connection state.

[0014] Through the design of applying the first and second standard test signals and comparing the differences in feedback signals, the background noise and the target noise are effectively separated. When the first standard test signal is applied to the segmented cable, the isolation connection channel collects the feedback signal, and a signal containing only the noise of the segmented cable itself can be obtained; when the second standard test signal is applied, the segmented cable is isolated, and the background noise of the connection channel and the surrounding environment can be obtained. By comparing these two groups of signals and eliminating the reference phase difference (such as the phase difference caused by the fixed delay of the channel, the physical structure difference, and the bottom noise), the remaining difference signal is the background noise of the path where the target segmented cable is located. This avoids the interference of the background noise on the detection of the target noise, enabling the signal-to-noise level characterization value to truly reflect the noise condition of the segmented cable.

[0015] By introducing an interference signal injection mechanism before step S5, the reliability of the detection results is greatly improved. When injecting interference signals with known characteristics into adjacent non-target segmented cables, monitor the stability change of the feedback signal of the target segmented cable. If it exceeds the allowable fluctuation range, re-collect the data. This design is like setting a "quality valve" for the detection process, which can timely detect and eliminate the influence of external sudden interference on the detection results. For example, when there is temporary electromagnetic interference on-site, this mechanism can ensure that the collected feedback signal is not interfered through dynamic adjustment, avoiding misjudgment caused by accidental noise, and making the detection results more stable and reliable.

[0016] The design of constructing multiple verification paths (direct connection, cross-connection, hybrid path) and randomly traversing for verification in steps S6 - S7 significantly enhances the ability to identify abnormal noise coupling. By comparing the signal attenuation differences of different segmented cables under the same verification path, the segmented cable with abnormal noise coupling can be quickly located. For example, when there is abnormal electromagnetic coupling between a certain segmented cable and the adjacent cable, the signal attenuation difference under the hybrid path will exceed the preset value, and thus it will be accurately marked. At the same time, aiming at the impedance mismatch problem that may occur in the hybrid path, by adjusting the impedance load at the physical test cable load, the noise error caused by impedance difference can be calibrated, making the detection result more in line with the actual operation situation. Description of the Drawings

[0017] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the following drawings.

[0018] Figure 1 It is a block diagram of the structure of the system according to an embodiment of the present invention. Detailed Embodiments

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] In the first aspect of the embodiments of the present disclosure, a method for detecting the noise of a paved cable is provided, including the following steps: S1. Determine the connection structure of each segmented cable in the paved cable system and the position of its connection point; S2. Determine at least one signal-to-noise test point on each of the segmented cables, connect the signal-to-noise test points through a connection channel, and the connection channels between the signal-to-noise test points are set to have the same signal isolation degree, and the connection mode of the connection channel is the same as the connection structure of each segmented cable; S3. Apply a first standard test signal to each signal-to-noise test point of each segmented cable in turn, isolate the connection channel and synchronously sample the first feedback test signal received by other signal-to-noise test points during each round of testing; S4. Apply a second standard test signal to the signal-to-noise test points of each segmented cable in turn, isolate each segmented cable and synchronously sample the second feedback test signal received by other signal-to-noise test points during each round of testing; S5. Based on the first feedback signal and the second feedback signal, separate the signal difference between the two, extract the signal other than the reference phase difference as the background noise signal, and determine the signal-to-noise level characterization value of each segmented cable; S6. Store and / or output the signal-to-noise level characterization value of each segmented cable.

[0021] As a preferred method, in S2: Set signal-to-noise test points at the connection points of each segmented cable; Connect to the signal-to-noise test points through a test physical cable with a preset length, and the wire diameter and material of the test physical cable are the same as those of the corresponding segmented cable; The connection channel is a physical simulation that does not include the test physical cable and has the same physical connection structure as the paved cable system, and the test physical cable is set to be connected to the segmented cable through the connection channel and / or cross adjacent segmented cables.

[0022] As a preferred method, the physical test cable is also set to have an impedance load with a preset variable range at its connection load.

[0023] As a preferred method, in S6, the signal other than the reference phase difference is extracted as the background noise signal, and the specific setting is as follows: Compare the first feedback test signal and the second feedback test signal obtained at other test points when the first standard test signal and the second standard test signal are applied to the same target segmented cable; Measure the phase difference caused by the fixed delay of the test signal through the channel or the physical difference between the connection channel and the segmented cable, and calculate the background noise of the connection channel at the same time, and use the phase difference and the background noise as the reference phase difference; Identify the remaining difference signal as the background noise signal from the path where the target segmented cable is located; Based on the relationship between the intensity of the remaining difference signal and the intensity of the standard test signal, calculate and determine the signal-to-noise level characterization value of the target segmented cable.

[0024] As a preferred method, before step S5, the following steps are further included: While applying the second standard test signal to the target segmented cable, selectively inject interference signals with known characteristics into one or more adjacent non-target segmented cables; Monitor the stability change of the second feedback test signal of the target segmented cable when the interference signal is applied and not applied. If the change in stability exceeds the preset allowable fluctuation range, return to execute step S4 to obtain new second feedback test signal data until the change in stability is within the preset allowable fluctuation range.

[0025] As a preferred method, when executing S3 and S4, both include: Selectively disconnect the communication paths of at least one adjacent segmented cable connected to the target segmented cable to construct a verification path, and the verification path includes: Only retain the paths between the target segmented cable and the directly adjacent segmented cable, directly connect to the remote segmented cable by skipping the intermediate segmented cable, and the hybrid path of the parallel test physical cable and the connection channel; Verify each verification path in a random order and traverse each segmented cable to perform verification.

[0026] As a preferred method, when comparing the verification of different segmented cables under the same test signal and constructing the same verification path, compare the attenuation differences between the first feedback signal and the second feedback signal measured by each verification path; if the attenuation difference between adjacent paths exceeds the preset value, mark that there is abnormal noise coupling in this segmented cable; If a hybrid path of a parallel test physical cable and a connection channel is constructed and there is an attenuation difference exceeding the preset value, synchronously inject a pulse interference signal into the non-target segmented cable, check the residual of the pulse interference signal in the hybrid path, and if the residual exceeds the preset value, adjust the impedance load at the load of the physical test cable until the residual is within the preset value; Disconnect the physical test cable and re-execute the signal acquisition of S3 - S4 for each verification path, Compare the background noise signal fluctuation ranges measured twice, and use this signal fluctuation range as the signal-to-noise level characterization value to obtain the calibration value of the signal-to-noise level characterization value under the hybrid path.

[0027] As a preferred method, summarize the signal-to-noise level characterization values of the same segmented cable under each verification path, calculate the standard deviation of the signal-to-noise level characterization values under each verification path, and if the standard deviation exceeds the threshold, use the calibrated characterization value of the hybrid path for storage and / or output.

[0028] In the second aspect of the embodiments of the present disclosure, a noise detection system for paved cables is provided, as Figure 1 shown, including: A structure recognition module for determining the connection structure and connection point positions of the segmented cables; The test point layout module is used to set signal-to-noise test points on the segmented cable, and connect each test point through a connection channel with the same connection structure as the segmented cable. The connection channel has the same signal isolation degree. The test point layout module also includes setting test points at the connection points, connecting through test physical cables with the same material as the corresponding segmented cable, and setting variable impedance at the load of the test physical cable. The signal processing module is used to apply first and second standard test signals to the test points. After separately isolating the connection channel and the segmented cable, it synchronously samples the feedback signals of other test points. The signal processing module also includes injecting interference signals and monitoring the stability of the feedback signals when applying the second standard test signal. The verification path construction module is used to disconnect the adjacent communication paths of the target segmented cable, construct verification paths including direct connection, cross-connection, and hybrid paths, and randomly traverse and verify. The noise analysis module is used to compare the differences in feedback signals, extract the background noise signal after determining the reference phase difference, and calculate the signal-to-noise level characterization value. It is also used to compare the attenuation differences of the verification paths, mark anomalies, and calibrate the hybrid paths. The data processing module is used to summarize the signal-to-noise level characterization values, store and / or output them after calibration.

[0029] The method provided by the embodiments of the present disclosure realizes the accurate positioning of the noise source through the corresponding design of the connection structure of the segmented cable and the layout of the test points. First, clarify the connection structure of each segmented cable and the position of the connection points, and then set signal-to-noise test points at the connection points. This test point layout based on the physical structure enables the test signal to directly reflect the actual connection state of each segmented cable. Since the connection channel adopts the same physical simulation structure as the paved cable system, and the material and wire diameter of the test physical cable are the same as the corresponding segmented cable, it ensures a high degree of matching between the test environment and the actual operating environment, avoiding noise detection deviations caused by differences in test conditions, and thus can accurately capture the noise characteristics of each segmented cable in the actual connection state.

[0030] Through the design of applying the first and second standard test signals and comparing the differences in feedback signals, the background noise and the target noise are effectively separated. When applying the first standard test signal to the segmented cable, isolating the connection channel and collecting the feedback signal can obtain a signal containing only the noise of the segmented cable itself; while applying the second standard test signal and isolating the segmented cable can obtain the background noise of the connection channel and the surrounding environment. By comparing these two groups of signals and eliminating the reference phase difference (such as the phase difference caused by the fixed delay of the channel, the physical structure difference, and the background noise), the remaining difference signal is the background noise of the path where the target segmented cable is located. This avoids the interference of the background noise on the detection of the target noise, enabling the signal-to-noise level characterization value to truly reflect the noise condition of the segmented cable.

[0031] Introducing an interference signal injection mechanism before step S5 significantly improves the reliability of the detection results. When injecting interference signals with known characteristics into adjacent non-target segmented cables, the stability change of the feedback signal of the monitored target segmented cable is monitored. If it exceeds the allowable fluctuation range, the data is recollected. This design is like setting a "quality valve" for the detection process, which can timely detect and eliminate the influence of external sudden interference on the detection results. For example, when there is temporary electromagnetic interference at the site, this mechanism can ensure that the collected feedback signal is not interfered through dynamic adjustment, avoiding misjudgment caused by accidental noise and making the detection results more stable and reliable.

[0032] The design of constructing multiple verification paths (direct connection, cross-connection, and hybrid path) and randomly traversing for verification in steps S6 - S7 significantly enhances the ability to identify abnormal noise coupling. By comparing the signal attenuation differences of different segmented cables under the same verification path, the segmented cable with abnormal noise coupling can be quickly located. For example, when there is abnormal electromagnetic coupling between a certain segmented cable and the adjacent cable, the signal attenuation difference under the hybrid path will exceed the preset value and thus be accurately marked. At the same time, aiming at the possible impedance mismatch problem in the hybrid path, by adjusting the impedance load at the physical test cable load, the noise error caused by impedance differences can be calibrated, making the detection results more in line with the actual operating conditions.

[0033] The above description and the accompanying drawings fully disclose the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible variations. Unless explicitly required, the individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of another identical element in the process, method, or device comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, the relevant parts may refer to the description of the method part.

[0034] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The technician can use different methods for each specific application to achieve the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The technician can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described devices, apparatuses, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again.

[0035] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functions, and operations of possible implementations of apparatuses, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a part of code, which contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks may occur in an order different from that noted in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. Each block in the block diagram and / or flowchart, as well as combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware device that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for detecting the noise of a laid cable, characterized in that, It includes the following steps: S1. Determine the connection structure of each segmented cable in the paved cable system and the positions of its connection points; S2. Determine at least one signal-to-noise test point on each of the segmented cables, connect the signal-to-noise test points through a connection channel, and set the connection channels between the signal-to-noise test points to have the same signal isolation degree, and the connection mode of the connection channels is the same as the connection structure of each segmented cable; S3. Apply a first standard test signal to each signal-to-noise test point of each segmented cable in turn, isolate the connection channel and synchronously sample the first feedback test signals received by other signal-to-noise test points during each round of testing; S4. Apply a second standard test signal to the signal-to-noise test points of each segmented cable in turn, isolate each segmented cable and synchronously sample the second feedback test signals received by other signal-to-noise test points during each round of testing; S5. According to the first feedback signal and the second feedback signal, separate the signal difference between the two, extract the signal outside the reference phase difference as the background noise signal, and determine the signal-to-noise level characterization value of each segmented cable; S6. Store and / or output the signal-to-noise level characterization value of each segmented cable.

2. The noise detection method for paved cables according to claim 1, characterized in that, In S2: Set a signal-to-noise test point at the connection point position of each segmented cable; Connect to the signal-to-noise test point through a test physical cable with a preset length, and the wire diameter and material of the test physical cable are the same as those of the corresponding segmented cable; The connection channel is a physical simulation that does not include the test physical cable and has the same physical connection structure as the paved cable system, and the test physical cable is set to be connected to the segmented cable through the connection channel and / or cross-connected to adjacent segmented cables.

3. The noise detection method for paved cables according to claim 2, characterized in that, The physical test cable is also set to have an impedance load with a preset variable range at its connection load.

4. The noise detection method for paved cables according to claim 1, characterized in that, In S6, extracting the signal outside the reference phase difference as the background noise signal is specifically set as: Compare the first feedback test signal and the second feedback test signal obtained at other test points when the first standard test signal and the second standard test signal are applied to the same target segmented cable; Measure the phase difference caused by the fixed delay of the test signal through the channel or the physical difference between the connection channel and the segmented cable, and calculate the background noise of the connection channel at the same time, and use the phase difference and the background noise as the reference phase difference; Identify the remaining difference signal as the background noise signal from the path where the target segmented cable is located; Based on the relationship between the intensity of the remaining difference signal and the intensity of the standard test signal, calculate and determine the signal-to-noise level characterization value of the target segmented cable.

5. The noise detection method for paved cables according to claim 3, wherein, Before step S5, it further includes the following steps: While applying the second standard test signal to the target segmented cable, selectively inject interference signals with known characteristics into one or more adjacent non-target segmented cables; Monitor the stability change of the second feedback test signal of the target segmented cable when the interference signal is applied and not applied. If the change in stability exceeds the preset allowable fluctuation range, return to step S4 to obtain new second feedback test signal data until the change in stability is within the preset allowable fluctuation range.

6. The noise detection method for paved cables according to claim 5, characterized in that, When executing S3 and S4, both include: Selectively disconnect the communication paths of at least one adjacent segmented cable connected to the target segmented cable to construct a verification path, which includes: Only retain the paths between the target segmented cable and the directly adjacent segmented cable, directly connect to the distal segmented cable by skipping the intermediate segmented cable, and the hybrid path of parallel testing the physical cable and the connection channel; Verify each verification path in a random order and traverse each segmented cable for verification.

7. The noise detection method for paved cables according to claim 6, characterized in that, Under the same test signal, when comparing the first feedback signal and the attenuation difference of the second feedback signal measured by each verification path when constructing the same verification path for different segmented cables; if the attenuation difference between adjacent paths exceeds the preset value, mark that there is abnormal noise coupling in this segmented cable; If a hybrid path of parallel testing the physical cable and the connection channel is constructed and the attenuation difference exceeds the preset value, synchronously inject a pulse interference signal into the non-target segmented cable, check the residue of the pulse interference signal in the hybrid path, and if the residue exceeds the preset value, adjust the impedance load at the load of the physical test cable to within the preset value. Disconnect the physical test cable and re-execute the signal acquisition of S3 - S4 for each verification path. Compare the background noise signal fluctuation ranges obtained from the two measurements, and use this signal fluctuation range as the signal-to-noise level characterization value to obtain the calibration value of the signal-to-noise level characterization value under the hybrid path.

8. The noise detection method for paved cables according to claim 7, characterized in that, It also includes: Summarize the signal-to-noise level characterization values of the same segmented cable under each verification path, calculate the standard deviation of the signal-to-noise level characterization values under each verification path, and if the standard deviation exceeds the threshold, use the calibrated characterization value of the hybrid path for storage and / or output.

9. The noise detection system for paved cables is characterized in that, Includes: A structure identification module for determining the connection structure and connection point positions of the segmented cable; A test point layout module for setting signal-to-noise test points on the segmented cable, connecting each test point through a connection channel with the same connection structure as the segmented cable, and the connection channel has the same signal isolation degree; the test point layout module also includes setting test points at the connection points and connecting them through test physical cables with the same material as the corresponding segmented cable, and a variable impedance is set at the load of the test physical cable. A signal processing module for applying the first and second standard test signals to the test points, synchronously sampling the feedback signals of other test points after isolating the connection channel and the segmented cable respectively; the signal processing module also includes injecting an interference signal and monitoring the stability of the feedback signal when applying the second standard test signal. A verification path construction module for disconnecting the adjacent communication paths of the target segmented cable, constructing a verification path including direct connection, cross-connection, and hybrid paths, and randomly traversing for verification. A noise analysis module for comparing the feedback signal differences, determining the reference phase difference and then extracting the background noise signal, calculating the signal-to-noise level characterization value; it is also used for comparing the attenuation differences of the verification paths, marking abnormalities and calibrating the hybrid path. A data processing module for summarizing the signal-to-noise level characterization values, storing and / or outputting after calibration.

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