Cable breakpoint detection system, method and device and storage medium
The single pulse signal is encoded and combined with the high-frequency characteristic value calculation of the signal processing unit, the problem of difficulty in positioning the cable breakpoint is solved, and the rapid and accurate detection of the cable breakpoint is achieved, which reduces the difficulty of maintenance and economic losses.
Patent Information
- Application Number
- CN202311732411.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-16
- Publication Date
- 2025-07-18
AI Technical Summary
The prior art is difficult to quickly and accurately locate cable breakpoints, especially cables installed underground or at high altitudes, resulting in difficult maintenance work and large economic losses.
The single pulse signal is encoded based on the linear combination S encoding method by the transmitting unit. Through the impulse response of the cable to be tested, the signal processing unit determines the characteristic values of the high-frequency transmit pulse and reflected pulse, and calculates the signal time difference to realize cable breakpoint detection.
It realizes rapid and accurate detection of cable breakpoints, reduces the work difficulty of maintenance personnel, and reduces economic losses.
Smart Images
Figure CN120334657A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cable break point detection, and particularly to a cable break point detection system, method, device and storage medium. Background Art
[0002] At present, cables are widely used in social life, including power cables used in high-voltage power transmission and communication cables used in the communication industry. Frequent cable failures make the maintenance work become more and more onerous. Cable breakage is one of the most common cable faults, which usually has two manifestations: the first is that the internal conductor is damaged and there is no obvious change in the external insulation protection layer; the second is that the cable line is directly disconnected due to external force. The internal damage of the cable cannot be directly observed by the naked eye, and since the cable is generally installed underground or at high altitude, it is very difficult to find the specific location of the cable break without professional testing equipment. Therefore, how to accurately and quickly locate is a problem that concerns the staff very much. Therefore, how to quickly detect the cable break point has become an urgent problem to be solved.
[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention
[0004] The main object of the present invention is to provide a cable break point detection system, method, device and storage medium, aiming to solve the problem of how to quickly detect the cable break point.
[0005] To achieve the above object, the present invention provides a cable break point detection system, which includes a transmitting unit, a cable to be measured, a receiving unit and a signal processing unit;
[0006] The transmitting unit is used to encode a single pulse signal based on the S coding method of linear combination to obtain a transmitted sequence pulse, and send the transmitted sequence pulse to the cable to be measured;
[0007] The cable to be measured is used to obtain a feedback pulse response according to the transmitted sequence pulse, and send the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit;
[0008] The signal processing unit is used to decode the transmitted sequence pulse and the feedback pulse response respectively to obtain a transmitted signal and a reflected signal, and determine the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively;
[0009] The signal processing unit is further configured to determine signal time difference information based on the high-frequency emission pulse eigenvalue and the high-frequency reflection pulse eigenvalue, and implement cable break point detection according to the signal time difference information.
[0010] Optionally, the transmitting unit is further configured to perform function processing on the single pulse signal to obtain a single pulse response;
[0011] The transmitting unit is further configured to perform encoding processing on the single pulse response according to the S coding method of linear combination to obtain a transmitted sequence pulse.
[0012] Optionally, the signal processing unit is further configured to perform noise reduction processing on the transmitted signal and the reflected signal respectively through a continuous wavelet transform expression to obtain a noise-reduced transmitted signal and a noise-reduced reflected signal.
[0013] Optionally, the continuous wavelet transform expression is:
[0014]
[0015] In the formula, WT f (a, b) is the noise-reduced transmitted signal or the noise-reduced reflected signal, f(t) is the transmitted signal or the reflected signal, t is time, ψ a,b (t) is the wavelet basis function, a is the scale parameter, b is the translation parameter, and R is the function space.
[0016] Optionally, the signal processing unit is further configured to extract a high-frequency band transmitted signal from the noise-reduced transmitted signal, and extract a high-frequency band reflected signal from the noise-reduced reflected signal;
[0017] The signal processing unit is further configured to determine a high-frequency emission pulse eigenvalue based on the high-frequency band transmitted signal, and determine a high-frequency reflection pulse eigenvalue based on the high-frequency band reflected signal.
[0018] In addition, to achieve the above object, the present invention also proposes a cable break point detection system, and the cable break point detection method includes the following steps:
[0019] The transmitting unit performs encoding processing on the single pulse signal according to the S coding method of linear combination to obtain a transmitted sequence pulse, and sends the transmitted sequence pulse to the cable under test;
[0020] The cable under test obtains a feedback pulse response according to the transmitted sequence pulse, and sends the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit;
[0021] The signal processing unit decodes the transmitted sequence pulses and the feedback impulse response respectively, obtains the transmitted signal and the reflected signal, and determines the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively;
[0022] The signal processing unit determines the signal time difference information according to the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue, and realizes cable break point detection according to the signal time difference information.
[0023] In addition, to achieve the above object, the present invention also proposes a cable break point detection device, which includes: a memory, a processor, and a cable break point detection program stored on the memory and executable on the processor. The cable break point detection program is configured to implement the steps of the cable break point detection system as described above.
[0024] In addition, to achieve the above object, the present invention also proposes a storage medium, on which a cable break point detection program is stored. When the cable break point detection program is executed by a processor, it implements the steps of the cable break point detection system as described above.
[0025] The cable break point detection system of the present invention includes a transmitting unit, a cable under test, a receiving unit, and a signal processing unit. First, the transmitting unit encodes a single pulse signal based on the S coding method of linear combination to obtain a transmitted sequence pulse, and sends the transmitted sequence pulse to the cable under test. Then, the cable under test obtains the feedback impulse response according to the transmitted sequence pulse, and sends the transmitted sequence pulse and the feedback impulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback impulse response to the signal processing unit. After that, the signal processing unit decodes the transmitted sequence pulse and the feedback impulse response respectively, obtains the transmitted signal and the reflected signal, and determines the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively. Finally, the signal processing unit determines the signal time difference information according to the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue, and realizes cable break point detection according to the signal time difference information. Compared with the prior art, in which it is necessary for workers to observe cable breakage, but the cable breakage position cannot be determined, in the present invention, by transmitting a linearly combined encoded pulse signal to the cable under test, applying equivalent time sampling technology to collect the transmitted signal and the reflected signal, and calculating the final test result after caching, transmitting, and processing the data, non-destructive detection of the cable break point position is realized. It can not only measure the length of the cable, but also accurately and quickly locate the breakage fault in the cable, reduce the work difficulty of maintenance personnel, and reduce economic losses. Description of the Drawings
[0026] Figure 1It is a schematic structural diagram of a cable break detection device in the hardware operating environment related to the embodiment solution of the present invention;
[0027] Figure 2 It is a structural block diagram of the first embodiment of the cable break detection system of the present invention;
[0028] Figure 3 It is a framework concept diagram of the first embodiment of the cable break detection system of the present invention;
[0029] Figure 4 It is a schematic diagram of the pulse coding principle of the first embodiment of the cable break detection system of the present invention;
[0030] Figure 5 It is a schematic diagram of wavelet transform noise reduction in the first embodiment of the cable break detection system of the present invention;
[0031] Figure 6 It is a schematic flowchart of the first embodiment of the cable break detection method of the present invention.
[0032] The implementation, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific Embodiments
[0033] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0034] Refer to Figure 1 , Figure 1 It is a schematic structural diagram of a cable break detection device in the hardware operating environment related to the embodiment solution of the present invention.
[0035] As Figure 1As shown in the figure, the cable break point detection device may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen and an input module such as a keyboard. Optionally, the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed Random Access Memory (RAM), or a stable Non-Volatile Memory (NVM), such as a disk memory. Optionally, the memory 1005 may also be a storage system independent of the aforementioned processor 1001.
[0036] Those skilled in the art can understand that Figure 1 the structure shown in does not constitute a limitation on the cable break point detection device, and may include more or fewer components than shown in the figure, or combine some components, or have different component arrangements.
[0037] As Figure 1 shown, the memory 1005, as a storage medium, may include an operating system, a network communication module, a user interface module, and a cable break point detection program.
[0038] In Figure 1 the cable break point detection device shown, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the cable break point detection device of the present invention may be arranged in the cable break point detection device. The cable break point detection device calls the cable break point detection program stored in the memory 1005 through the processor 1001 and executes the cable break point detection system provided by the embodiments of the present invention.
[0039] The embodiments of the present invention provide a cable break point detection system. Referring to Figure 2 , Figure 2 it is a structural block diagram of the first embodiment of the cable break point detection system of the present invention.
[0040] In this embodiment, the cable break point detection system includes a transmitting unit 2001, a cable to be measured 2002, a receiving unit 2003, and a signal processing unit 2004.
[0041] In this embodiment, referring to Figure 3 , Figure 3 is the framework concept diagram of the first embodiment of the cable break point detection system of the present invention. Figure 3 In Figure 3 , the transmitting unit sends the transmitted signal to the cable to be tested. The receiving unit includes a signal conditioning, data acquisition, and FPGA control circuit.
[0042] The transmitting unit 2001 is used to encode the single-pulse signal based on the S-encoding method of linear combination to obtain a transmitted sequence pulse, and send the transmitted sequence pulse to the cable 2002 to be tested.
[0043] Further, the transmitting unit performs a function process on the single-pulse signal to obtain a single-pulse response, and encodes the single-pulse response according to the S-encoding method of linear combination to obtain a transmitted sequence pulse.
[0044] In this embodiment, referring to Figure 4 , Figure 4 is the schematic diagram of the pulse coding principle of the first embodiment of the cable break point detection system of the present invention. The response of the single-pulse signal P0(t) in the system h(t) (i.e., function process) is S0(t) (i.e., single-pulse response). A series of sequence pulses (i.e., transmitted sequence pulses) P1(t), P2(t),..., P n (t) are obtained by encoding the single-pulse response according to a certain coding rule, where n is the number of encodings, indicating how many different code patterns are required for a certain specific coding. Then these sequence pulse signals are transmitted to the cable to be tested.
[0045] It should also be noted that the S-encoding method based on linear combination is as follows:
[0046] The S-encoding is a unipolar matrix composed of 0 and 1, which is transformed from the Hadamard matrix. First, construct an n-order Simplex matrix, and its order is 2 k -1 (k is a positive integer).
[0047] H0 = [1]
[0048]
[0049] Among them, is 2 k ×2k For a Hadamard matrix, where k is a positive integer greater than or equal to 1, the bipolar Hadamard matrix is converted into a unipolar matrix according to the following rules:
[0050]
[0051] where m is the order of the Hadamard matrix, m = n + 1, s ij is the element at the i-th row and j-th column of matrix S’, and h ij is the element at the i-th row and j-th column of a Hadamard matrix of the same order. The elements in the first row and first column of matrix S’ are all 0, so the highest non-zero minor of S’ is:
[0052]
[0053] The above matrix S is the Simplex matrix.
[0054] It should also be noted that when using time-domain reflection technology to detect the position of a cable break, the positioning accuracy is affected by multiple parameters such as the pulse signal width, cable length, and the position of the break itself. When the pulse is very narrow, the energy it carries is very small and it is easily submerged by noise during attenuation; when the pulse is very wide, it is prone to false judgment when the positions of adjacent breaks are close, reducing the spatial resolution. Therefore, it is considered to encode the pulse signal and obtain an equivalent single-pulse measurement result according to the corresponding decoding method, which can improve the measurement dynamic range and signal-to-noise ratio.
[0055] The cable to be measured 2002 is used to obtain the feedback pulse response according to the transmitted sequence pulse and send the transmitted sequence pulse and the feedback pulse response to the receiving unit 2003, so that the receiving unit 2003 sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit 2004.
[0056] In this embodiment, these sequence pulse signals are transmitted to the cable to be measured to obtain their pulse responses (i.e., the feedback pulse responses) S1(t), S2(t), …, Sn(t). Then, the transmitted sequence pulse and the feedback pulse response are sent to the signal conditioning module of the receiving unit. The signal conditioning module sends the transmitted sequence pulse and the feedback pulse response to the data acquisition module. The data acquisition module sends the transmitted sequence pulse and the feedback pulse response to the FPGA control circuit module. The FPGA control circuit module sends the transmitted sequence pulse and the feedback pulse response to the upper computer in the signal processing unit through a serial port to USB for signal processing.
[0057] It should also be noted that the receiving unit adopts the equivalent time sampling technology and completes the acquisition of high-frequency signals through an A / D conversion chip with a relatively low sampling rate. The acquisition circuit obtains one acquisition point after one or more cycles of the signal to be acquired. After a short delay, the sampling circuit repeats the above process after the same time to obtain all the sampling points. Arranging all the points in chronological order gives the restored sampled signal.
[0058] The receiving unit adopts the internal data caching technology of FPGA and realizes the functions of data acquisition, caching, and transmission by establishing a dual-port RAM and a read-write data module.
[0059] The signal processing unit 2004 is used to decode the transmitted sequence pulse and the feedback pulse response respectively, obtain the transmitted signal and the reflected signal, and determine the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively.
[0060] It should also be noted that the signal processing unit performs noise reduction processing on the transmitted signal and the reflected signal respectively through the continuous wavelet transform expression, and obtains the denoised transmitted signal and the denoised reflected signal. Refer to Figure 5 , Figure 5 This is a schematic diagram of wavelet transform noise reduction for the first embodiment of the cable break point detection system of the present invention. The figure shows the reconstruction effect of the wavelet transform on the sine wave signal mixed with noise when the decomposition level is 4.
[0061] The continuous wavelet transform expression is:
[0062]
[0063]
[0064] In the formula, WT f (a, b) is the denoised transmitted signal or the denoised reflected signal, <x, y> is the inner product, f(t) is the transmitted signal or the reflected signal, t is the time, ψ a,b (t) is the wavelet basis function, a is the scale parameter, b is the translation parameter, R is the function space, L 2 (R) is the function space of square integrable functions, and x(t) is the function parameter.
[0065] It should also be noted that the wavelet transform can provide both time domain and frequency domain information simultaneously. A large amount of noise will be introduced when the cable break point detection system acquires the transmitted signal and the reflected signal, which seriously affects the extraction and detection of the cable break point position information. Through the wavelet noise reduction technology, the noise in the signal can be reduced to the lowest level, the restoration degree of the original signal can reach the highest level, and more accurate measurement results can be obtained.
[0066] It should be understood that the signal processing unit extracts the high-frequency band transmitted signal from the noise-reduced transmitted signal, and extracts the high-frequency band reflected signal from the noise-reduced reflected signal; the signal processing unit determines the high-frequency transmission pulse eigenvalue according to the high-frequency band transmitted signal, and determines the high-frequency reflection pulse eigenvalue according to the high-frequency band reflected signal.
[0067] The signal processing unit 2004 is further configured to determine the signal time difference information according to the high-frequency transmission pulse eigenvalue and the high-frequency reflection pulse eigenvalue, and implement cable break point detection according to the signal time difference information.
[0068] In a specific implementation, the signal processing unit separates the high and low frequency bands of the original signal through wavelet transform, detects the high-frequency transmission pulse eigenvalue corresponding to the high-frequency band transmitted signal and the high-frequency reflection pulse eigenvalue corresponding to the high-frequency band reflected signal in the high-frequency band, and calculates the time difference information between the transmitted signal and the reflected signal (i.e., the signal time difference information) according to the high-frequency transmission pulse eigenvalue and the high-frequency reflection pulse eigenvalue, so as to implement cable break point detection.
[0069] In this embodiment, first, the transmitting unit encodes the single-pulse signal based on the S coding method of linear combination to obtain a transmitted sequence pulse, and sends the transmitted sequence pulse to the cable under test. Then, the cable under test obtains the feedback pulse response according to the transmitted sequence pulse, and sends the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit. After that, the signal processing unit decodes the transmitted sequence pulse and the feedback pulse response respectively to obtain the transmitted signal and the reflected signal, and determines the high-frequency transmission pulse eigenvalue and the high-frequency reflection pulse eigenvalue of the transmitted signal and the reflected signal respectively. Finally, the signal processing unit determines the signal time difference information according to the high-frequency transmission pulse eigenvalue and the high-frequency reflection pulse eigenvalue, and implements cable break point detection according to the signal time difference information. Compared with the prior art where workers need to observe cable breakage, but the breakage location cannot be determined, in this embodiment, by transmitting a linearly combined coded pulse signal to the cable under test, applying the equivalent time sampling technology to collect the transmitted signal and the reflected signal, and calculating the final test result after caching, transmitting and processing the data, the non-destructive detection of the cable break point position is realized. It can not only measure the length of the cable, but also accurately and quickly locate the breakage fault in the cable, reduce the work difficulty of maintenance personnel and reduce economic losses.
[0070] Refer to Figure 6 , Figure 6 is a schematic flowchart of the first embodiment of the cable break point detection method of the present invention.
[0071] As Figure 6As shown in the figure, the cable break point detection method proposed in the embodiment of the present invention includes the following steps:
[0072] Step S10: The transmitting unit encodes the single-pulse signal based on the S-encoding method of linear combination to obtain a transmitted sequence pulse, and sends the transmitted sequence pulse to the cable to be measured.
[0073] Further, the transmitting unit performs a function process on the single-pulse signal to obtain a single-pulse response, and encodes the single-pulse response according to the S-encoding method of linear combination to obtain a transmitted sequence pulse.
[0074] In this embodiment, referring to Figure 4 , Figure 4 is a schematic diagram of the pulse encoding principle of the first embodiment of the cable break point detection system of the present invention. The response of the single-pulse signal P0(t) in the system h(t) (i.e., function process) is S0(t) (i.e., single-pulse response). A series of sequence pulses (i.e., transmitted sequence pulses) P1(t), P2(t), …, P n (t) are obtained by encoding the single-pulse response according to a certain encoding rule, where n is the number of encodings, indicating how many different code patterns are required for a certain specific encoding. Then these sequence pulse signals are transmitted to the cable to be measured.
[0075] It should also be noted that the S-encoding method based on linear combination is:
[0076] The S-encoding is a unipolar matrix composed of 0 and 1, which is obtained by transforming the Hadamard matrix. First, construct an n-order Simplex matrix, the order of which is 2 k -1 (k is a positive integer).
[0077] H0 = [1]
[0078]
[0079] Among them, is a 2 k ×2 k Hadamard matrix, k is a positive integer greater than or equal to 1. The bipolar Hadamard matrix is converted into a unipolar matrix according to the following rules:
[0080]
[0081] where m is the order of the Hadamard matrix, m = n + 1, s ij is the element in the i-th row and j-th column of the matrix S’, and h ij is the element in the i-th row and j-th column of the Hadamard matrix of the same order. The elements in the first row and first column of the matrix S’ are all 0, so the highest non-zero minor of S’ is:
[0082]
[0083] The above matrix S is the Simplex matrix.
[0084] It should also be noted that when using time-domain reflectometry to detect the position of the cable break point, the positioning accuracy is affected by multiple parameters such as the pulse signal width, cable length, and the position of the break point itself. When the pulse is very narrow, the energy it carries is very small and it is easily submerged by noise during the attenuation process; when the pulse is very wide, it is prone to false judgment when the positions of adjacent break points are close, reducing the spatial resolution. Therefore, it is considered to encode the pulse signal and obtain the equivalent single-pulse measurement result according to the corresponding decoding method, which can improve the measurement dynamic range and signal-to-noise ratio.
[0085] Step S20: The cable to be measured obtains the feedback pulse response according to the transmitted sequence pulse, and sends the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit.
[0086] In this embodiment, these sequence pulse signals are transmitted to the cable to be measured to obtain their pulse responses (i.e., the feedback pulse responses) S1(t), S2(t),..., Sn(t). Then, the transmitted sequence pulse and the feedback pulse response are sent to the signal conditioning module of the receiving unit. The signal conditioning module sends the transmitted sequence pulse and the feedback pulse response to the data acquisition module. The data acquisition module sends the transmitted sequence pulse and the feedback pulse response to the FPGA control circuit module. The FPGA control circuit module sends the transmitted sequence pulse and the feedback pulse response to the host computer in the signal processing unit through the serial-to-USB for signal processing.
[0087] It should also be noted that the receiving unit uses the equivalent time sampling technology to complete the acquisition of high-frequency signals through an A / D conversion chip with a relatively low sampling rate. The acquisition circuit obtains one acquisition point after one or more cycles of the signal to be acquired. After a short delay, the sampling circuit repeats the above process after the same time to obtain all the sampling points. Arranging all the points in chronological order gives the restored sampled signal.
[0088] The receiving unit uses the internal data caching technology of the FPGA to realize the functions of data acquisition, caching, and transmission by establishing a dual-port RAM and a read-write data module.
[0089] Step S30: The signal processing unit decodes the transmitted sequence pulses and the feedback impulse response respectively to obtain the transmitted signal and the reflected signal, and determines the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively.
[0090] It should also be noted that the signal processing unit performs noise reduction processing on the transmitted signal and the reflected signal respectively through the continuous wavelet transform expression to obtain the noise-reduced transmitted signal and the noise-reduced reflected signal. Refer to Figure 5 , Figure 5 which is a schematic diagram of wavelet transform noise reduction in the first embodiment of the cable break point detection system of the present invention. The figure shows the reconstruction effect of the wavelet transform on the sine wave signal mixed with noise when the decomposition level is 4.
[0091] The continuous wavelet transform expression is:
[0092]
[0093]
[0094] In the formula, WT f (a, b) is the noise-reduced transmitted signal or the noise-reduced reflected signal, <x, y> is the inner product, f(t) is the transmitted signal or the reflected signal, t is the time, ψ a,b (t) is the wavelet basis function, a is the scale parameter, b is the translation parameter, R is the function space, and L 2 (R) is the square-integrable function space.
[0095] It should also be noted that the wavelet transform can provide time-domain and frequency-domain information simultaneously. A large amount of noise will be introduced when the cable break point detection system collects the transmitted signal and the reflected signal, which seriously affects the extraction and detection of the cable break point position information. Through the wavelet noise reduction technology, the noise in the signal can be reduced to the lowest level, the restoration degree of the original signal can reach the highest level, and more accurate measurement results can be obtained.
[0096] It should be understood that the signal processing unit extracts the high-frequency band transmitted signal from the noise-reduced transmitted signal and extracts the high-frequency band reflected signal from the noise-reduced reflected signal; the signal processing unit determines the high-frequency transmitted pulse eigenvalue according to the high-frequency band transmitted signal and determines the high-frequency reflected pulse eigenvalue according to the high-frequency band reflected signal.
[0097] Step S40: The signal processing unit determines the signal time difference information according to the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue, and realizes cable break point detection according to the signal time difference information.
[0098] In a specific implementation, the signal processing unit separates the high and low frequency bands of the original signal through wavelet transform, detects the high-frequency emission pulse eigenvalues corresponding to the high-frequency band emission signal and the high-frequency reflection pulse eigenvalues corresponding to the high-frequency band reflection signal in the high-frequency band, and calculates the time difference information between the emission signal and the reflection signal (i.e., the signal time difference information) based on the high-frequency emission pulse eigenvalues and the high-frequency reflection pulse eigenvalues, thereby realizing cable break point detection.
[0099] In this embodiment, first, the transmitting unit encodes the single-pulse signal based on the linear combination S coding method to obtain the transmitted sequence pulse, and sends the transmitted sequence pulse to the cable under test. Then, the cable under test obtains the feedback pulse response according to the transmitted sequence pulse, and sends the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit. After that, the signal processing unit decodes the transmitted sequence pulse and the feedback pulse response respectively to obtain the emission signal and the reflection signal, and determines the high-frequency emission pulse eigenvalues and the high-frequency reflection pulse eigenvalues of the emission signal and the reflection signal respectively. Finally, the signal processing unit determines the signal time difference information according to the high-frequency emission pulse eigenvalues and the high-frequency reflection pulse eigenvalues, and realizes cable break point detection according to the signal time difference information. Compared with the prior art where workers need to observe cable breakage but cannot determine the cable breakage location, in this embodiment, by transmitting a linearly combined coded pulse signal to the cable under test, applying the equivalent time sampling technology to collect the emission signal and the reflection signal, and calculating the final test result after caching, transmitting and processing the data, the non-destructive detection of the cable break point location is realized. It can not only measure the length of the cable, but also accurately and quickly locate the breakage fault in the cable, reduce the work difficulty of maintenance personnel and reduce economic losses.
[0100] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.
[0101] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.
[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases, the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory / random access memory, magnetic disk, optical disk), and includes several instructions for causing a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.
[0103] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.
Claims
1. A cable breakpoint detection system, characterized in that, The cable break point detection system includes a transmitting unit, a cable to be measured, a receiving unit, and a signal processing unit; The transmitting unit is configured to encode a single pulse signal based on the S coding method of linear combination to obtain a transmitted sequence pulse, and send the transmitted sequence pulse to the cable to be measured; The cable to be measured is configured to obtain a feedback pulse response according to the transmitted sequence pulse, and send the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit; The signal processing unit is configured to decode the transmitted sequence pulse and the feedback pulse response respectively to obtain a transmitted signal and a reflected signal, and determine the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively; The signal processing unit is further configured to determine signal time difference information according to the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue, and implement cable break point detection according to the signal time difference information.
2. The system according to claim 1, wherein The transmitting unit is further configured to perform function processing on the single pulse signal to obtain a single pulse response; The transmitting unit is further configured to encode the single pulse response according to the S coding method of linear combination to obtain a transmitted sequence pulse.
3. The system according to claim 2, wherein The signal processing unit is further configured to perform noise reduction processing on the transmitted signal and the reflected signal respectively through the continuous wavelet transform expression to obtain a noise-reduced transmitted signal and a noise-reduced reflected signal.
4. The system according to claim 3, wherein The continuous wavelet transform expression is: Wherein, WTf(a,b) is the transmitted signal after noise reduction or the reflected signal after noise reduction, f(t) is the transmitted signal or the reflected signal, t is time, ψ a,b(t) is the wavelet basis function, a is the scale parameter, b is the translation parameter, and R is the function space.
5. The system according to claim 4, wherein The signal processing unit is further configured to extract a high-frequency band transmitted signal from the noise-reduced transmitted signal, and extract a high-frequency band reflected signal from the noise-reduced reflected signal; The signal processing unit is further configured to determine the high-frequency transmitted pulse eigenvalue according to the high-frequency band transmitted signal, and determine the high-frequency reflected pulse eigenvalue according to the high-frequency band reflected signal.
6. A method for detecting cable breakpoints, characterized in that, The cable break point detection method includes the following steps: The transmitting unit encodes a single pulse signal based on the S coding method of linear combination to obtain a transmitted sequence pulse, and sends the transmitted sequence pulse to the cable to be measured; The cable to be measured obtains a feedback pulse response according to the transmitted sequence pulse, and sends the transmitted sequence pulse and the feedback pulse response to the receiving unit, so that the receiving unit sends the transmitted sequence pulse and the feedback pulse response to the signal processing unit; The signal processing unit decodes the transmitted sequence pulse and the feedback pulse response respectively to obtain a transmitted signal and a reflected signal, and determines the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue of the transmitted signal and the reflected signal respectively; The signal processing unit determines signal time difference information according to the high-frequency transmitted pulse eigenvalue and the high-frequency reflected pulse eigenvalue, and implements cable break point detection according to the signal time difference information.
7. A cable breakpoint detection device, characterized in that, The device includes: a memory, a processor, and a cable break point detection program stored on the memory and executable on the processor, the cable break point detection program being configured to implement the steps of the cable break point detection system according to any one of claims 1 to 5.
8. A storage medium, characterized in that, A cable break point detection program is stored on the storage medium, and when the cable break point detection program is executed by a processor, the steps of the cable break point detection system according to any one of claims 1 to 5 are implemented.