Method and system for improving OPGW optical cable route identification efficiency

Abstract

The invention discloses a method and system for improving OPGW optical cable route identification efficiency. The method comprises the steps that an unmanned aerial vehicle carrying a frequency generator is controlled to move to the position above an OPGW optical cable, and sound wave signals with specific frequency and sending intervals are sent out; receiving the Rayleigh scattering signal by using distributed sound wave sensing equipment, demodulating, and restoring to obtain a demodulated signal; carrying out Fourier transform on the demodulation signal to obtain a fundamental frequency component and a frequency multiplication component in a frequency domain; executing the near-far operation for multiple times, adjusting the vertical distance, sending out a sound wave signal, and observing the waveform change of a demodulation signal; and if the waveform transformation is obvious and meets the expectation, carrying out conformity scoring by using specific frequency filtering, interval control and sound content comparison, judging a target cable and outputting identification information. The method solves the problems of inspection efficiency, accuracy and safety of the high-voltage transmission line in a complex environment, provides an automatic solution for hot-line work and optical cable monitoring, and has good application potential.

Description

Technical Field

[0001] The invention belongs to the technical field of optical cable route identification, and in particular relates to a method and a system for improving OPGW optical cable route identification efficiency. Background Art

[0002] OPGW optical cable stands for Optical Fiber Composite Ground Wire, which is an optical fiber composite overhead ground wire, also known as composite optical cable ground wire. It is an optical cable that places optical fiber in the ground wire of an overhead high-voltage transmission line to form an optical fiber communication network on the transmission line. This optical cable can transmit both optical signals and electricity, and has the dual functions of ground wire and communication. OPGW optical cable is located at the top of the power line. Due to the special location, it is not convenient to carry out inspection, maintenance and repair of OPGW optical cable due to the influence of line power outages and safety factors. Therefore, timely identification of OPGW optical cable routing has become a guarantee for improving the safe and reliable operation of the power line communication network, which is of great significance.

[0003] Common methods currently used to identify OPGW cables with transmission line outages or faults include the following: (1) Distributed fiber optic sensing: Distributed fiber optic sensing (such as DTS, DAS, etc.) is used to monitor the changes in temperature, vibration, strain and other parameters along the OPGW optical cable, and then judge the status of the OPGW optical cable; however, this method mainly relies on the continuous optical signal changes along the optical fiber to analyze the health of the optical cable, but it is easily affected by the environment and erroneous signals, resulting in misjudgment and increasing maintenance time and cost.

[0004] (2) Manual inspection: Traditional manual inspection methods require maintenance personnel to climb towers along the transmission lines to check the status of OPGW optical cables, confirm the specific location of broken fibers and repair them. This allows for direct access to the status information of OPGW optical cables. However, due to efficiency and safety constraints, manual training is time-consuming and laborious. Especially over long distances or in complex terrains, there are certain safety risks, which poses a huge challenge to inspection work.

[0005] (3) Test instrument positioning: With the help of fiber optic test instruments such as OTDR (optical time domain reflectometer), the specific location of the broken fiber can be measured and calculated; however, this method usually requires the optical cable to be powered off, and it is impossible to quickly identify the faulty optical cable when it is powered on, which increases the difficulty and time cost of maintenance, especially in emergency maintenance or harsh environments; and it is difficult to accurately locate the specific broken optical cable when there are many fiber breaks. Summary of the invention

[0006] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a method and system for improving the efficiency of OPGW optical cable routing identification.

[0007] In order to achieve the above object, the present invention provides a method for improving the efficiency of OPGW optical cable routing identification, comprising the following steps: Control the drone carrying the frequency generator to move above the OPGW optical cable; Send a sound wave signal with a specific frequency and transmission interval to the OPGW optical cable through a frequency generator; A distributed acoustic wave sensing device is used to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and the Rayleigh scattering signal is demodulated and restored to obtain a demodulated signal; The demodulated signal is subjected to Fourier transform to obtain the base frequency and multiple frequency components in the frequency domain; Perform approach-and-fly operations multiple times, adjust the vertical distance between the drone and the OPGW cable and send out acoustic signals, observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or not as expected, determine that the OPGW cable is not the target cable, and control the drone carrying the frequency generator to identify the next OPGW cable; If the waveform changes significantly and as expected, specific frequency filtering, interval control, and sound content comparison are used to perform compliance scoring to determine whether the OPGW cable is the target cable; if so, the identification information of the OPGW cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW cable.

[0008] As a preferred technical solution, the acoustic wave signal penetrates the aluminum layer of the OPGW optical cable and acts on the optical fiber core, causing the optical fiber to be periodically forced to vibrate, forming a photoelastic effect to generate Rayleigh scattering changes in the optical signal; The vibration period of the optical fiber core is consistent with the specific frequency of the acoustic wave signal.

[0009] As a preferred technical solution, the demodulation and restoration of the Rayleigh scattered signal to obtain a demodulated signal is specifically as follows: Amplifying the Rayleigh scattered signal received by the distributed acoustic wave sensor device and filtering it through a bandpass filter; The low-frequency information is extracted from the filtered Rayleigh scattered signal by coherent demodulation technology; Extracting baseband signal and frequency-multiplied signal from low-frequency information; The baseband signal and the frequency multiplier signal are analyzed and reconstructed, and after restoration, they are compared with the sound wave signal to obtain the final demodulated signal.

[0010] As a preferred technical solution, the demodulated signal is subjected to Fourier transform to obtain the base frequency and frequency multiplication components in the frequency domain, specifically: Perform Fourier transform on the demodulated signal to obtain a frequency domain signal; Identify, extract and filter the frequency domain signal within a specific frequency range to obtain the fundamental frequency and multiple frequency components in the frequency domain.

[0011] As a preferred technical solution, the compliance scoring is performed using specific frequency filtering, interval control and sound content comparison, specifically: Compare the fundamental frequency and frequency components in the frequency domain to see if they are consistent with the reference characteristics of the OPGW optical cable, and calculate the comprehensive frequency domain score; Compare the periodicity and time domain waveform of the demodulated signal to see if it matches the reference waveform characteristics of the OPGW optical cable, and calculate the comprehensive time domain frequency division; Calculate the match of the demodulated signal by the speech recognition algorithm or the signal's specific modulation content; The weighted sum of the comprehensive frequency domain score, comprehensive time domain frequency score and matching degree is used to obtain the conformity score: S 总 = w 1 S 频域 + w 2 S 时域 + w 3 S 内容 , in, w 1. w 2. w 3 are the weights of the comprehensive frequency domain score, comprehensive time domain frequency score and matching degree, S 频域 is the comprehensive frequency domain score, S 时域 For comprehensive time domain frequency division, S 内容 is the matching degree of the demodulated signal; If the conformity score is greater than the set threshold, the OPGW optical cable is judged to be the target optical cable and the identification result is output; otherwise, it does not conform, and the drone continues to adjust its position to identify the next OPGW optical cable.

[0012] As a preferred technical solution, the steps for calculating the comprehensive frequency domain score are: Calculate the frequency deviation between the fundamental frequency in the frequency domain and the reference fundamental frequency of the OPGW optical cable S 基频 ; The number and amplitude distribution of the extracted double frequency components are statistically analyzed to determine the similarity with the reference double frequency of the OPGW optical cable. S 倍频 ; Weighted to get the comprehensive frequency domain score: S 频域 = f 1 S 基频 + f 2S 倍频 , in f 1. f 2 are the weights of the fundamental frequency and the multiple frequency respectively; The similarity is calculated using cosine similarity.

[0013] As a preferred technical solution, the steps for calculating the comprehensive time domain score are: Calculate the periodicity index of the demodulated signal S 周期 ; The dynamic time warping algorithm is used to compare the time domain waveform of the demodulated signal with the reference waveform of the OPGW optical cable and calculate the similarity of the time domain waveform. S 相似度 ; Weighted to get the comprehensive time domain score: S 时域 = t 1 S 周期 + t 2 S 相似度 , in t 1. t 2 are the weights of the periodicity index and the time domain waveform similarity, respectively.

[0014] As a preferred technical solution, the matching degree of the demodulated signal is calculated by analyzing the content of the demodulated signal using a speech recognition algorithm, and the formula is: S 内容 =100×(number of correctly matched contents / total number of contents).

[0015] Another aspect of the present invention provides a system for improving the efficiency of OPGW optical cable routing identification, which is applied to the above-mentioned method for improving the efficiency of OPGW optical cable routing identification, and the system includes a flight control module, a signal transmission module, a receiving demodulation module, a signal conversion module, a waveform observation module and a scoring identification module; The flight control module controls the drone carrying the frequency generator to move above the OPGW optical cable; The signal transmitting module sends a sound wave signal of a specific frequency and interval to the OPGW optical cable through a frequency generator; The receiving and demodulating module uses a distributed sensor device to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and demodulates and restores the Rayleigh scattering signal to obtain a demodulated signal; The signal conversion module is used to obtain the base frequency and frequency multiplication components in the frequency domain by Fourier transforming the demodulated signal; The flight control module and the signal transmission module are used to perform approach-remote operations multiple times, adjust the vertical distance between the UAV and the OPGW optical cable and send out acoustic signals, call the waveform observation module to observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or do not meet expectations, the OPGW optical cable is determined to be not the target optical cable, and the UAV carrying the frequency generator is controlled to identify the next OPGW optical cable; When the waveform changes in the waveform observation module are obvious and consistent with the prediction, the scoring and identification module uses specific frequency filtering, interval control and sound content comparison to perform compliance scoring to determine whether the OPGW optical cable is the target cable; if so, the identification information of the OPGW optical cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW optical cable.

[0016] In another aspect, the present invention provides a computer-readable storage medium storing a program, which, when executed by a processor, implements the above-mentioned method for improving the efficiency of OPGW optical cable routing identification.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention proposes a method for improving the efficiency of OPGW optical cable route identification, using an unmanned aerial vehicle carrying a frequency generator to fly above the optical cable, and through dynamic adjustments such as flying close-far away, analyzing the changes in the demodulated waveform, further improving the accuracy of identification and the accuracy of optical cable positioning; at the same time, through the combination of frequency, interval control and sound wave content characteristics, accurate identification of optical cable targets is achieved, and external environmental noise and interference are effectively eliminated; combined with artificial intelligence algorithms and speech recognition algorithms, the demodulated sound wave spectrum characteristics are analyzed and scored, and the identity of the optical cable is determined by the comprehensive score being higher than the threshold, so that the probability of misjudgment is reduced and the accuracy of judgment is guaranteed. Therefore, the present invention uses unmanned aerial vehicles to carry equipment for inspection operations, solves the efficiency, accuracy and safety problems of inspections in high-voltage transmission lines and complex environments, provides an automated solution for live operations and optical cable monitoring, and has good practical application potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 The present invention is a flowchart of a method for improving the efficiency of OPGW optical cable routing identification in an embodiment of the present invention.

[0020] Figure 2The present invention is a block diagram of a system for improving the efficiency of OPGW optical cable routing identification in an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the structure of a computer-readable storage medium in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0023] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0024] Example 1 See also Figure 1 In one embodiment of the present application, a method for improving the efficiency of OPGW optical cable routing identification is provided, comprising the following steps: S1. Control the drone carrying the frequency generator to move above the OPGW optical cable according to the expected path, and prepare to transmit the acoustic wave signal.

[0025] S2. When the UAV reaches the expected location, it sends a sound wave signal with a specific frequency and transmission interval to the OPGW optical cable through a frequency generator. This specific frequency is designed to form an obvious identification feature to distinguish interfering sound waves.

[0026] Furthermore, the emitted acoustic wave signal penetrates the aluminum layer of the OPGW optical cable and acts on the optical fiber core, causing periodic forced vibration of the optical fiber. At this time, the vibration period of the optical fiber core is consistent with the specific frequency of the acoustic wave signal, forming a photoelastic effect to generate Rayleigh scattering changes in the optical signal.

[0027] S3. Use a distributed sensor device to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and demodulate and restore the Rayleigh scattering signal to obtain a demodulated signal.

[0028] Distributed sensor devices are also called distributed fiber optic sensors. The sensors detect and process signals based on the Rayleigh scattering characteristics within the optical fiber, and can achieve continuous, multi-point perception of physical quantities along the length of the optical fiber.

[0029] Furthermore, the frequency characteristics affected by the sound wave are extracted through the signal demodulation process. The specific signal demodulation process identifies two types of frequencies: one is the base frequency, which is the external driving force frequency of the corresponding frequency generator; the other is the derivative frequency, which is the multiple of the base frequency and is obtained after bandpass sampling. The specific signal demodulation process is: S3.1. Signal acquisition: First, the distributed acoustic wave sensor device receives the Rayleigh scattered signal, including the fundamental frequency and its related frequency harmonic components.

[0030] S3.2. Signal amplification and filtering: Since the Rayleigh scattering signal is usually weak, the received Rayleigh scattering signal needs to be amplified for subsequent analysis.

[0031] S3.3, Bandpass filtering: The amplified Rayleigh scattering signal is filtered through a bandpass filter to remove high-frequency noise and low-frequency interference, and only the frequency range of interest, especially the fundamental frequency and multiple frequency signals, is retained.

[0032] S3.4, Carrier demodulation: The Rayleigh scattering signal contains the vibration frequency of the sound wave. These vibrations appear as modulated signals on a high-frequency carrier in the signal. Through coherent demodulation technology, the low-frequency information, that is, the frequency characteristics caused by the external driving force, is extracted from the complex filtered Rayleigh scattering signal.

[0033] S3.5. Fundamental frequency extraction: A main fundamental frequency component will appear in the demodulated signal, which corresponds to the frequency of the acoustic signal emitted by the frequency generator; the fundamental frequency is the main frequency that drives the forced vibration of the optical fiber and is closely related to the periodic vibration of the optical fiber.

[0034] S3.6. Frequency multiplication extraction: In addition to the base frequency, frequency multiplication components will also be seen in the demodulated signal. These frequency multiplication components are integer multiples of the base frequency. In actual signal processing, after bandpass sampling, the frequency multiplication signal will be extracted to provide more frequency characteristics.

[0035] S3.7, Signal Restoration: The demodulated signal usually contains useful frequency components, such as fundamental frequency and harmonics. By analyzing and reconstructing these frequency components, a restored signal can be obtained, which reflects the vibration characteristics of the optical fiber after being acted upon by sound waves. The restoration process compares the demodulated frequency signal with the actual measured reference signal to confirm its accuracy, and finally obtains a demodulated signal that restores the characteristics of the sound wave signal.

[0036] S4. The demodulated signal is subjected to Fourier transform to obtain the base frequency and the multiplied frequency components in the frequency domain.

[0037] Furthermore, the demodulated signal is a frequency feature extracted from the Rayleigh scattering signal, which usually contains the frequency information of the periodic vibration caused by the acoustic signal. Since this signal is usually a time domain signal, it needs to be converted to the frequency domain to analyze different frequency components, specifically: S4.1. Perform Fourier transform: For demodulated signal x ( t ) is Fourier transformed to obtain its frequency domain signal X ( f ), which represents the amplitude and phase information at different frequencies. After Fourier transform, the frequency domain signal X ( f ) corresponds to a frequency component, where X ( f ) reflects the intensity of the frequency component.

[0038] S4.2. Analyze frequency domain signals: In the frequency domain, the most important thing is to identify the fundamental frequency and frequency multiples of the signal; the fundamental frequency is the driving frequency of the sound wave signal (that is, the frequency output by the frequency generator), and the frequency multiples are integer multiples of the fundamental frequency, which usually appear in the high-frequency part of the signal. For a known frequency range, the fundamental frequency and frequency multiples can be extracted by selecting a specific frequency interval in the frequency domain. For example, the fundamental frequency is usually located in the low-frequency part of the signal, while the frequency multiples will be at integer multiples of the fundamental frequency.

[0039] S4.3, extract the fundamental frequency and the harmonic components: Base frequency: According to the frequency domain signal after Fourier transform, the base frequency is usually located in the lowest frequency band of the frequency component; assuming that the sound wave signal emitted by the frequency generator is f 0, the amplitude of the fundamental frequency component is the largest, usually a peak in the spectrum after Fourier transform; frequency components: frequency components are integer multiples of the fundamental frequency; for example, if the fundamental frequency is f 0, then the frequency doubling components are 2 f 0,3 f 0, 4 f 0 etc.

[0040] S4.4, Spectrum analysis and screening: By further screening the Fourier transform results, the fundamental frequency and frequency-multiple components within a specific frequency range can be determined; the frequency values ​​and amplitudes of the fundamental frequency and frequency-multiple components will be used to further analyze and verify the response characteristics of the optical fiber. If the frequencies and amplitudes of the fundamental frequency and frequency-multiple components in the frequency domain signal after Fourier transform are as expected, it can be confirmed that the signal is related to the target optical cable and subsequent identification can be continued.

[0041] S5. Perform approach-and-fly-away operations multiple times, adjust the vertical distance between the UAV and the OPGW optical cable and send out acoustic signals, observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or not as expected, determine that the OPGW optical cable is not the target optical cable, and control the UAV carrying the frequency generator to identify the next OPGW optical cable.

[0042] By adjusting the vertical distance between the UAV and the OPGW optical cable and performing the "fly close-fly away" operation multiple times, the demodulated signal waveform is analyzed to learn how it changes with distance after each operation. If the waveform changes as expected, the optical cable location is preliminarily confirmed. If the UAV position adjustment causes the waveform to change inconspicuously or not as expected, it is determined to be a non-target optical cable, and the UAV is instructed to continue looking for other possible locations.

[0043] In this embodiment, the specific situation where the waveform is not obvious is: (1) Weak signal amplitude: When the drone transmits an acoustic wave signal to the OPGW optical cable, if the amplitude of the Rayleigh scattering signal received by the distributed acoustic wave sensing device is small, it indicates that the acoustic wave does not effectively act on the target optical fiber; Specific indicators: The amplitude of the received signal is lower than the signal-to-noise ratio, indicating that the efficiency of sound wave transmission is insufficient.

[0044] (2) The expected frequency components are not present in the frequency domain features: the demodulated signal cannot clearly extract the fundamental frequency corresponding to the transmitted sound wave frequency after Fourier transform, or no significant frequency components are found; Specific manifestations: the fundamental frequency component does not dominate the spectrum, or its amplitude is close to the background noise level; the expected double frequency component is missing, or its amplitude and distribution are significantly different from the reference data in the target optical cable feature library.

[0045] (3) Insufficient waveform periodicity: If the demodulated time domain waveform fails to show periodic vibrations that match the frequency of the transmitted sound wave; Specific manifestations: The time domain signal lacks regularity, the periodic characteristics of the vibration are fuzzy or even unrecognizable. The waveform noise component is significant and no features that can be used for further identification are formed.

[0046] (4) The waveform changes after dynamic adjustment of the vertical distance are not significant: When adjusting the vertical distance between the UAV and the OPGW optical cable, under normal circumstances, the strength or frequency distribution of the received signal will show a certain change trend (such as increased amplitude or clearer frequency distribution); Specific manifestation: After adjusting the distance, the waveform characteristics of the received signal do not change significantly, or the change amplitude is smaller than the expected range.

[0047] The specific situations that do not meet expectations are: (1) Frequency does not match the target characteristics: the specific frequency of the transmitted sound wave is inconsistent with the vibration response frequency of the target optical cable; Specific manifestations: In the frequency comparison, it was found that the fundamental frequency deviated from the set range of the target optical cable reference data; the proportional relationship of the double frequency components (such as the amplitude ratio of the double frequency and the triple frequency) did not reach the characteristic mode of the target optical cable.

[0048] (2) The interference signal is too strong: In a complex environment, if the interference signal makes it difficult to distinguish the extracted fundamental frequency and frequency components; Specific manifestations: The interference frequency overlaps with the target frequency, and the pure baseband cannot be extracted from the spectrum; the demodulated waveform is too greatly affected by environmental noise and the signal integrity is insufficient.

[0049] (3) The compliance score is too low: In the following compliance scores, the compliance score calculated by frequency filtering, signal content comparison and speech recognition algorithm is lower than the set threshold; Specific manifestation: The score deviates from the expected characteristics of the target optical cable, indicating that the current optical cable is not the target optical cable.

[0050] S6. If the waveform change is obvious and in line with expectations, specific frequency filtering, interval control and sound content comparison are used to perform compliance scoring to determine whether the OPGW optical cable is the target cable; if so, the identification information of the OPGW optical cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW optical cable.

[0051] Further, after confirming that the waveform changes are in line with expectations, the present application further compares the frequency, interval and sound content features to ensure that the identified optical cable is the target optical cable; in order to exclude interference signals, the present application adopts a disturbance mode of regular on-off control, that is, a disturbance mode of fixed frequency sound wave + fixed interval, to shield the influence of random interference on the demodulated signal. In this embodiment, a sound wave signal of a preset frequency is used to compare with the demodulated signal to exclude about 90% of the interfering sound waves, further improving the purity and recognition accuracy of the signal; at the same time, a 5Hz transmission interval is adopted, that is, the frequency generator pauses for 100ms after emitting audio every 100ms, and further reduces misjudgment according to the sound wave interval characteristics; finally, a speech recognition algorithm is used to compare the specific content in the sound wave signals emitted multiple times to improve the accuracy of recognition. In the disturbance mode of regular on-off control, compliance scoring is performed, that is: the frequency and vibration interval features are identified through big data analysis and artificial intelligence algorithms, and compliance scoring is performed in combination with the speech recognition algorithm. If the score is greater than or equal to the set threshold (such as 90%), it is judged as the target optical cable, and the recognition result is output. If it does not match, the drone will continue to adjust its position to search for the optical cable.

[0052] Furthermore, the compliance scores are as follows: S6.1. Frequency characteristic scoring: Compare the fundamental frequency and frequency harmonic components in the frequency domain to see if they are consistent with the reference characteristics of the OPGW optical cable, and calculate the comprehensive frequency domain score.

[0053] Specifically, the frequency deviation of the fundamental frequency is first calculated, and then the number of extracted frequency components and the similarity of amplitude distribution with the target feature library are statistically analyzed. The similarity is calculated using cosine similarity, and finally weighted to obtain a comprehensive frequency domain score. S 频域 = f 1 S 基频 + f 2 S 倍频 , f 1. f 2 are the weights of the base frequency and the multiple frequency respectively. f 1=0.7, f 2=0.3.

[0054] S6.2. Time domain characteristic scoring: Compare the periodicity and time domain waveform of the demodulated signal to see if it matches the reference waveform characteristics of the OPGW optical cable, and calculate the comprehensive time domain score.

[0055] Specifically, the periodicity index of the demodulated signal (such as the ratio of the autocorrelation peak to the background noise) is first calculated; then the dynamic time warping algorithm is used to compare the time domain waveform of the demodulated signal with the reference waveform of the OPGW optical cable, and finally the comprehensive time domain score is obtained by weighting: S 时域 = t 1 S 周期 + t 2 S 相似度 , t 1. t 2 are the periodicity index and the weight of the time domain waveform respectively. t 1=0.6, t 2=0.4.

[0056] S6.3, Signal Content Scoring: Assess the integrity of the signal by matching the speech recognition algorithm or the specific modulation content of the signal.

[0057] Specifically, the demodulated signal is analyzed using a speech recognition algorithm to determine whether the acoustic signal retains specific modulation content after being transmitted through the OPGW optical cable, and the accuracy of the transmitted content is identified. The matching degree calculation formula is: S 内容 =100×(number of correctly matched contents / total number of contents).

[0058] S6.4. The above three scores are weighted and summed to obtain the compliance score. The calculation formula is: S 总 = w 1 S 频域 +w 2 S 时域 + w 3 S 内容 ,in, w 1. w 2. w 3 are weights of corresponding scores. In this embodiment, w 1=0.5, w 2=0.3, w 3=0.2, which can be dynamically adjusted according to the specific application scenario and target optical cable characteristics.

[0059] It should be noted that, for the sake of convenience, the aforementioned method embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited to the described order of actions, because according to the present invention, certain steps can be performed in other orders or simultaneously.

[0060] Example 2 Based on the same idea as the method for improving the efficiency of OPGW optical cable routing identification in the above embodiment, the present invention also provides a system for improving the efficiency of OPGW optical cable routing identification, which can be used to execute the above method for improving the efficiency of OPGW optical cable routing identification. For ease of explanation, the structural schematic diagram of an embodiment of a system for improving the efficiency of OPGW optical cable routing identification only shows the parts related to the embodiment of the present invention. Those skilled in the art can understand that the illustrated structure does not constitute a limitation on the device, and may include more or fewer components than shown in the diagram, or combine certain components, or arrange the components differently.

[0061] See also Figure 2 , in another embodiment of the present application, a system for improving the efficiency of OPGW optical cable routing identification is provided, the system comprising a flight control module, a signal transmission module, a receiving demodulation module, a signal conversion module, a waveform observation module, and a scoring identification module; Among them, the flight control module controls the drone carrying the frequency generator to move above the OPGW optical cable; The signal transmission module sends a sound wave signal of specific frequency and interval to the OPGW optical cable through a frequency generator; The receiving and demodulating module uses a distributed sensor device to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and demodulates and restores the Rayleigh scattering signal to obtain a demodulated signal; The signal conversion module is used to obtain the base frequency and multiplied frequency components in the frequency domain by Fourier transforming the demodulated signal; The flight control module and the signal transmission module are used to perform approach-remote operations multiple times, adjust the vertical distance between the UAV and the OPGW optical cable and send out acoustic signals, call the waveform observation module to observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or do not meet expectations, the OPGW optical cable is determined to be not the target optical cable, and the UAV carrying the frequency generator is controlled to identify the next OPGW optical cable; When the waveform changes in the waveform observation module are obvious and consistent with the prediction, the scoring and identification module uses specific frequency filtering, interval control and sound content comparison to perform compliance scoring to determine whether the OPGW optical cable is the target cable; if so, the identification information of the OPGW optical cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW optical cable.

[0062] It should be noted that a system for improving the efficiency of OPGW optical cable routing identification of the present invention corresponds one to one with a method for improving the efficiency of OPGW optical cable routing identification of the present invention. The technical features and beneficial effects described in the embodiment of the above-mentioned method for improving the efficiency of OPGW optical cable routing identification are applicable to an embodiment of improving the efficiency of OPGW optical cable routing identification. For specific contents, please refer to the description in the embodiment of the method of the present invention, which will not be repeated here. This is hereby declared.

[0063] In addition, in the implementation of a system for improving the OPGW optical cable routing identification efficiency in the above-mentioned embodiment, the logical division of each program module is only an example. In actual applications, the above-mentioned functions can be assigned to different program modules as needed, for example, for the configuration requirements of the corresponding hardware or the convenience of software implementation. That is, the internal structure of the system for improving the OPGW optical cable routing identification efficiency is divided into different program modules to complete all or part of the functions described above.

[0064] Example 3 See also Figure 3 In this embodiment, a computer-readable storage medium is also provided, which stores a program. When the program is executed by a processor, the method for improving the efficiency of OPGW optical cable routing identification is implemented, which is specifically: Control the drone carrying the frequency generator to move above the OPGW optical cable; Send a sound wave signal with a specific frequency and transmission interval to the OPGW optical cable through a frequency generator; A distributed acoustic wave sensing device is used to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and the Rayleigh scattering signal is demodulated and restored to obtain a demodulated signal; The demodulated signal is subjected to Fourier transform to obtain the base frequency and multiple frequency components in the frequency domain; Perform approach-and-fly operations multiple times, adjust the vertical distance between the drone and the OPGW cable and send out acoustic signals, observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or not as expected, determine that the OPGW cable is not the target cable, and control the drone carrying the frequency generator to identify the next OPGW cable; If the waveform changes significantly and as expected, specific frequency filtering, interval control, and sound content comparison are used to perform compliance scoring to determine whether the OPGW cable is the target cable; if so, the identification information of the OPGW cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW cable.

[0065] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0066] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for improving OPGW optical cable routing recognition efficiency, characterized in that: The steps include: Control the drone carrying the frequency generator to move above the OPGW optical cable; Send a sound wave signal with a specific frequency and transmission interval to the OPGW optical cable through a frequency generator; A distributed acoustic wave sensing device is used to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and the Rayleigh scattering signal is demodulated and restored to obtain a demodulated signal; The demodulated signal is subjected to Fourier transform to obtain the base frequency and multiple frequency components in the frequency domain; Perform approach-and-fly operations multiple times, adjust the vertical distance between the drone and the OPGW cable and send out acoustic signals, observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or not as expected, determine that the OPGW cable is not the target cable, and control the drone carrying the frequency generator to identify the next OPGW cable; If the waveform changes significantly and as expected, specific frequency filtering, interval control, and sound content comparison are used to perform compliance scoring to determine whether the OPGW cable is the target cable; if so, the identification information of the OPGW cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW cable.

2. The method for improving OPGW optical cable routing identification efficiency according to claim 1, characterized in that: The acoustic wave signal penetrates the aluminum layer of the OPGW optical cable and acts on the optical fiber core, causing the optical fiber to be periodically forced to vibrate, forming a photoelastic effect to generate Rayleigh scattering changes in the optical signal; The vibration period of the optical fiber core is consistent with the specific frequency of the acoustic wave signal.

3. The method for improving OPGW optical cable routing identification efficiency according to claim 1, characterized in that: The demodulation and restoration of the Rayleigh scattered signal to obtain the demodulated signal is specifically as follows: Amplifying the Rayleigh scattered signal received by the distributed acoustic wave sensor device and filtering it through a bandpass filter; The low-frequency information is extracted from the filtered Rayleigh scattered signal by coherent demodulation technology; Extracting baseband signal and frequency-multiplied signal from low-frequency information; The baseband signal and the frequency multiplier signal are analyzed and reconstructed, and after restoration, they are compared with the sound wave signal to obtain the final demodulated signal.

4. The method for improving OPGW optical cable routing identification efficiency according to claim 1, characterized in that: The demodulated signal is subjected to Fourier transform to obtain the base frequency and the frequency multiplication components in the frequency domain, specifically: Perform Fourier transform on the demodulated signal to obtain a frequency domain signal; Identify, extract and filter the frequency domain signal within a specific frequency range to obtain the fundamental frequency and multiple frequency components in the frequency domain.

5. The method for improving OPGW optical cable routing identification efficiency according to claim 1, characterized in that: The compliance scoring is performed using specific frequency filtering, interval control and sound content comparison, specifically: Compare the fundamental frequency and frequency components in the frequency domain to see if they are consistent with the reference characteristics of the OPGW optical cable, and calculate the comprehensive frequency domain score; Compare the periodicity and time domain waveform of the demodulated signal to see if it matches the reference waveform characteristics of the OPGW optical cable, and calculate the comprehensive time domain frequency division; Calculate the match of the demodulated signal by the speech recognition algorithm or the signal's specific modulation content; The weighted sum of the comprehensive frequency domain score, comprehensive time domain frequency score and matching degree is used to obtain the conformity score: S 总 = w 1 S 频域 + w 2 S 时域 + w 3 S 内容 ， in, w 1. w 2. w 3 are the weights of the comprehensive frequency domain score, comprehensive time domain frequency score and matching degree, S 频域 is the comprehensive frequency domain score, S 时域 For comprehensive time domain frequency division, S 内容 is the matching degree of the demodulated signal; If the conformity score is greater than the set threshold, the OPGW optical cable is judged to be the target optical cable and the identification result is output; otherwise, it does not conform, and the drone continues to adjust its position to identify the next OPGW optical cable.

6. The system for improving OPGW optical cable routing identification efficiency according to claim 5, characterized in that: The calculation steps of the comprehensive frequency domain score are: Calculate the frequency deviation between the fundamental frequency in the frequency domain and the reference fundamental frequency of the OPGW optical cable S 基频 ; The number and amplitude distribution of the extracted double frequency components are statistically analyzed to determine the similarity with the reference double frequency of the OPGW optical cable. S 倍频 ; Weighted to get the comprehensive frequency domain score: S 频域 = f 1 S 基频 + f 2 S 倍频 ， in f 1. f 2 are the weights of the fundamental frequency and the multiple frequency respectively; The similarity is calculated using cosine similarity.

7. The system for improving OPGW optical cable routing identification efficiency according to claim 5, characterized in that: The steps for calculating the comprehensive time domain score are as follows: Calculate the periodicity index of the demodulated signal S 周期 ; The dynamic time warping algorithm is used to compare the time domain waveform of the demodulated signal with the reference waveform of the OPGW optical cable and calculate the similarity of the time domain waveform. S 相似度 ; Weighted to get the comprehensive time domain score: S 时域 = t 1 S 周期 + t 2 S 相似度 ， in t 1. t 2 are the weights of the periodicity index and the time domain waveform similarity, respectively.

8. The system for improving OPGW optical cable routing identification efficiency according to claim 5, characterized in that: The matching degree of the demodulated signal is calculated by analyzing the content of the demodulated signal using a speech recognition algorithm, and the formula is: S 内容 =100×(number of correctly matched contents / total number of contents).

9. A system for improving OPGW optical cable routing recognition efficiency, applied to the method for improving OPGW optical cable routing recognition efficiency as claimed in any one of claims 1 to 8, characterized in that: The system includes a flight control module, a signal transmission module, a receiving demodulation module, a signal conversion module, a waveform observation module and a scoring recognition module; The flight control module controls the drone carrying the frequency generator to move above the OPGW optical cable; The signal transmitting module sends a sound wave signal of a specific frequency and interval to the OPGW optical cable through a frequency generator; The receiving and demodulating module uses a distributed sensor device to receive the Rayleigh scattering signal generated by the forced vibration of the optical fiber at the starting end of the optical fiber of the OPGW optical cable, and demodulates and restores the Rayleigh scattering signal to obtain a demodulated signal; The signal conversion module is used to obtain the base frequency and frequency multiplication components in the frequency domain by Fourier transforming the demodulated signal; The flight control module and the signal transmission module are used to perform approach-remote operations multiple times, adjust the vertical distance between the UAV and the OPGW optical cable and send out acoustic signals, call the waveform observation module to observe the waveform changes of the demodulated signal, and if the waveform changes are not obvious or do not meet expectations, the OPGW optical cable is determined to be not the target optical cable, and the UAV carrying the frequency generator is controlled to identify the next OPGW optical cable; When the waveform changes in the waveform observation module are obvious and consistent with the prediction, the scoring and identification module uses specific frequency filtering, interval control and sound content comparison to perform compliance scoring to determine whether the OPGW optical cable is the target cable; if so, the identification information of the OPGW optical cable is output; otherwise, the drone carrying the frequency generator is controlled to identify the next OPGW optical cable.

10. A computer-readable storage medium storing a program, characterized in that: When the program is executed by a processor, the method for improving the efficiency of OPGW optical cable routing identification as described in any one of claims 1 to 8 is implemented.

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