Optical cable automatic identification method and system based on wireless radio frequency and optical time domain reflection

Abstract

The invention relates to the technical field of optical cable identification and detection, and discloses an optical cable automatic identification method and system based on wireless radio frequency and optical time domain reflectometer, and the method comprises the steps: collecting environment disturbance parameters; setting a vibration mode based on the environment disturbance parameters; selecting an optical cable without the radio frequency tag as a current optical cable; applying vibration interference to the current optical cable based on the vibration mode; identifying a current optical cable, and acquiring optical cable information of the current optical cable; installing a radio frequency tag for the current optical cable; binding the radio frequency tag with the optical cable information of the current optical cable; radio frequency tag installation of all optical cables is completed; acquiring optical cable information of a target optical cable, and querying a radio frequency tag corresponding to the target optical cable; activating a radio frequency tag corresponding to the target optical cable, and performing indication positioning on the target optical cable; according to the invention, the accuracy and efficiency of optical cable identification are improved, and the method can adapt to various complex optical cable laying environments.

Description

Technical Field

[0001] The present application relates to the technical field of optical cable identification and detection, and in particular to an optical cable automatic identification method and system based on wireless radio frequency and optical time domain reflectometry. Background Art

[0002] The optical cable network covers a wide range, involving a large number of physical connection points and routing nodes; the optical cable laying environment is complex and diverse, including underground pipelines, inside buildings, bridges and tunnels, etc., which increases the difficulty of optical cable management and maintenance. Existing optical cable identification methods mainly rely on manual records and tag markings, which are prone to errors and omissions. In underground pipelines or inside buildings, there are a large number of optical cables and the wiring is complex. It is difficult for technicians to accurately find the target optical cable, especially when multiple optical cables are laid in parallel. It is easy to make mistakes if only relying on marking and manual search methods. Even if an optical time domain detector is used for detection, it can only provide approximate location information of the target optical cable. During optical time domain detection, the optical cable will be affected by environmental mechanical vibration, human activities and other factors, resulting in phase changes and frequency interference, affecting the identification accuracy. In addition, physical contact and collision between optical cables will also interfere with the identification of the target optical cable, and it is difficult for the existing technology to distinguish which of the multiple optical cables the target optical cable is under these interferences.

[0003] For example, a Chinese patent with the authorization announcement number CN113438016B discloses a method for identifying an optical cable, including: inputting detection optical signals to multiple optical cable access ports in a first space to form multiple optical fiber sensing channels; applying vibration signals of different frequencies to multiple optical cables to be identified in a second space, the second space being far away from the first space; receiving multiple backward Rayleigh scattered optical signals returned by multiple optical cables to be identified, and converting them into backward Rayleigh scattered electrical signals; collecting and analyzing multiple backward Rayleigh scattered electrical signals to obtain the vibration frequency corresponding to each optical fiber sensing channel; and determining the matching relationship between each optical fiber sensing channel and the optical cable to be identified in the second space according to the corresponding relationship between the vibration frequency and the vibration signal. This method can realize the rapid identification and positioning of optical cables.

[0004] For example, a Chinese patent with the authorization announcement number CN115189766B discloses a method, device, system and storage medium for identifying optical cables, which are used to improve the efficiency of identifying target operating optical cables among a large number of optical cables. The optical cable identification method includes: obtaining knocking waveform data according to the detection channel, the knocking waveform data is data generated by knocking the optical cable facility point; when the knocking waveform data meets the first vibration waveform condition, confirming that there is a target optical cable connected to the detection channel at the optical cable facility point, and obtaining the distance data of the target optical cable at the optical cable facility point according to the knocking waveform data; obtaining the frequency domain waveform data of the detection channel under the distance data, the frequency domain waveform data is generated by the vibration device loading vibration on the candidate optical cable in the optical cable facility point at a preset frequency; when the frequency domain waveform data meets the second vibration waveform condition at the preset frequency, confirming that the candidate optical cable is the target optical cable.

[0005] The above patents all have the problem raised by this background technology: when there are interferences such as environmental mechanical vibration, human activities, and physical contact and collision between optical cables, the recognition accuracy of the target optical cable will be affected.

[0006] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the application and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in the field. Summary of the invention

[0007] The technical problem to be solved by the present application is to overcome the defects of the prior art, provide an optical cable automatic identification method and system based on wireless radio frequency and optical time domain reflection, improve the accuracy and efficiency of optical cable identification, and improve the adaptability to various complex optical cable laying environments.

[0008] In order to solve the above technical problems, this application provides the following technical solutions: On the one hand, the present application provides an automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry, comprising the following steps: S1: Collect environmental disturbance parameters; set a vibration mode based on the environmental disturbance parameters; S2: selecting an optical cable without a radio frequency tag installed as the current optical cable; applying vibration interference to the current optical cable based on the vibration mode; S3: Identify the current optical cable based on the optical time domain detection and the vibration interference, and obtain the optical cable information of the current optical cable; S4: Install a radio frequency tag for the current optical cable; bind the radio frequency tag to the optical cable information of the current optical cable; S5: Repeat S2 to S4 until the RFID tags of all optical cables are installed; S6: Obtaining the optical cable information of the target optical cable, and querying the radio frequency tag corresponding to the target optical cable based on the optical cable information; S7: Activate the radio frequency tag corresponding to the target optical cable to indicate the location of the target optical cable.

[0009] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the environmental disturbance parameters include the environmental disturbance frequency band and the signal distortion; The collecting of environmental disturbance parameters includes collecting environmental disturbance frequency bands; the collecting of environmental disturbance frequency bands is performed based on optical time domain detection, specifically including: Injecting a detection pulse into the optical cable and continuously collecting a detection signal, wherein the detection signal is a backscattered Rayleigh signal of the detection pulse in the optical cable; Recording the phase of the detection signal to generate a time series of the phase of the detection signal; The frequency spectrum of the detection signal phase is analyzed based on the time series of the detection signal phase to obtain the environmental disturbance frequency band.

[0010] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the collecting environmental disturbance parameters also includes determining the signal distortion, the method is as follows: A vibration detection experiment is conducted, specifically as follows: randomly select an optical cable and apply a vibration disturbance with a specified frequency to the selected optical cable; perform optical time domain detection on each optical cable respectively, and record the number of optical cables that detect the specified frequency; for any optical cable, the method for detecting the specified frequency is as follows: inject a detection pulse into the optical cable, and continuously collect detection signals to generate a time series of the detection signal phase; based on the time series of the detection signal phase, a frequency spectrum of the detection signal phase is generated, and if there is a frequency component in the frequency spectrum whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the specified frequency is less than a preset deviation threshold, the corresponding optical cable detects the specified frequency; The vibration detection experiment is repeated at least p times. If the number of optical cables with the specified frequency detected in at least q vibration detection experiments is greater than 1 or equal to 0, the signal distortion is high; otherwise, the signal distortion is low.

[0011] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the vibration mode includes the frequency and phase of the vibration signal; setting the vibration mode based on the environmental disturbance parameter includes setting the vibration signal frequency, and the method is as follows: Set an alternative vibration frequency band; the alternative vibration frequency band is the value range of the alternative vibration signal frequency.

[0012] If there is no environmental disturbance frequency band, selecting a frequency from the candidate vibration frequency band as the vibration signal frequency; If there is an environmental disturbance frequency band, determine the optional frequency band; the optional frequency band is a frequency band in the alternative vibration frequency band that does not overlap with the environmental disturbance frequency band; count the total length of the interval of the optional frequency band, and let the ratio of the total length of the interval of the optional frequency band to the length of the interval of the alternative vibration frequency band be d; set the ratio threshold ; If d is greater than , then select a frequency from the optional frequency band as the vibration signal frequency; if d is less than or equal to , then m frequencies are selected from the optional frequency band for superposition, and the superposition frequency is generated as the vibration signal frequency, and among the selected m frequencies, there is no integer multiple relationship between any two frequencies.

[0013] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: setting the vibration mode based on the environmental disturbance parameter also includes setting the vibration signal phase, the method is as follows: If the signal distortion is high, the vibration signal phase is set, specifically including: Generate a target phase sequence; any element in the target phase sequence corresponds to a cycle of the vibration signal, and the element value is the phase of the vibration signal in the corresponding cycle; the elements in the target phase sequence change periodically; when applying vibration interference to the current optical cable, set the phase of the vibration signal with reference to the target phase sequence.

[0014] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: identifying the current optical cable based on optical time domain detection and the vibration interference specifically includes: Injecting a detection pulse into each optical cable respectively, and continuously collecting detection signals to generate a time series of the detection signal phase of each optical cable; generating a frequency spectrum of the phase of the detection signal of each optical cable based on the time series of the phase of the detection signal; If the vibration signal frequency is a single frequency, and there is a frequency component corresponding to the vibration signal frequency in the frequency spectrum of the detection signal phase of any optical cable, then the corresponding optical cable is marked as the first undetermined optical cable; When the vibration signal frequency is the superposition frequency, and the frequency spectrum of the detection signal phase of any optical cable includes frequency components corresponding to each frequency involved in the superposition, the corresponding optical cable is marked as the first pending optical cable; if there is only one first pending optical cable, the first pending optical cable is the current optical cable.

[0015] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, the method of identifying the current optical cable based on optical time domain detection and the vibration interference further includes: If there are at least two first optical cables to be determined, phase demodulation is performed on the time series of the detection signal phase of each first optical cable to be determined to obtain the disturbance signal phase of each first optical cable to be determined at different time points, and the disturbance signal phase of each first optical cable to be determined is arranged into a disturbance phase sequence in time sequence; the time difference between any two adjacent disturbance signal phases in the disturbance phase sequence is equal to one period of the vibration signal; The cross-correlation coefficients between the target phase sequence and the disturbance phase sequence of each first pending optical cable at different lag times are calculated respectively; a correlation threshold is set; if there is a lag time such that the cross-correlation coefficient between the disturbance phase sequence of any first pending optical cable and the target phase sequence is greater than the correlation threshold, the corresponding first pending optical cable is marked as a second pending optical cable; if there is only one second pending optical cable, the second pending optical cable is the current optical cable.

[0016] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, the method of identifying the current optical cable based on optical time domain detection and the vibration interference further includes: If there are at least two second pending optical cables, the mutual correlation coefficients of the disturbance phase sequences of any two second pending optical cables at different lag times are calculated; the lag time that makes the mutual correlation coefficients of the disturbance phase sequences of the two second pending optical cables greater than the correlation threshold is determined, and the phase change sequence of the two second pending optical cables is judged based on the lag time; all the second pending optical cables are sorted according to the phase change sequence, and the second pending optical cable with the first phase change is the current optical cable.

[0017] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, wherein: the optical cable information includes the optical cable number and the optical cable attribute information; the optical cable attribute information includes the optical cable identification information, key routing point information, and connection port information; any radio frequency tag has a unique identification code and a corresponding response frequency band; Binding the radio frequency tag to the optical cable information of the current optical cable, specifically including: binding the optical cable number of the current optical cable to the identification code and the response frequency band of the radio frequency tag, and sending them to the cloud server; The method of querying the radio frequency tag corresponding to the target optical cable based on the optical cable information specifically includes: Querying the optical cable number of the target optical cable based on at least one piece of optical cable attribute information; The identification code of the radio frequency tag bound to the cable number of the target optical cable and the corresponding response frequency band are queried through the cloud server.

[0018] As a preferred solution of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry described in the present application, any radio frequency tag includes an energy collection circuit and a passive LED; the radio frequency tag corresponding to the activated target optical cable is used to indicate and locate the target optical cable, specifically including: Sending a radio frequency signal to the area where the target optical cable is located; the frequency of the radio frequency signal is within the response frequency band of the radio frequency tag installed on the target optical cable; the radio frequency signal includes a coding instruction, and the coding instruction includes an identification code; The RFID tag installed on the target optical cable responds to the RFID signal, parses the coding instruction, obtains the identification code and determines whether the identification code is correct; if correct, the energy collection circuit is activated; the energy collection circuit converts the energy of the RFID signal into direct current and lights up the corresponding passive LED.

[0019] In a second aspect, the present application provides an optical cable automatic identification system based on wireless radio frequency and optical time domain reflection, including a vibrator module, an optical time domain detection module, a radio frequency tag module, a cloud server module, and a mobile terminal module; wherein: The vibrator module is used to apply vibration to the optical cable, and includes a control unit and a vibrator; the control unit controls the vibrator to generate a vibration signal based on a preset frequency and phase; The optical time domain detection module is used to perform optical time domain detection on the optical cable; The cloud server module includes a database and a cloud computing unit; wherein the database is used to store the optical cable number, the optical cable attribute information, and the identification code and response frequency band of the radio frequency tag bound to each optical cable; the cloud computing unit is used to set the vibration mode and send the command for controlling the vibration mode to the control unit; The radio frequency tag module is used to indicate and locate the target optical cable; The mobile terminal module includes a mobile terminal device and a radio frequency reader; the mobile terminal device queries the identification code and response frequency band of the radio frequency tag bound to the target optical cable from the cloud server module; the radio frequency reader sends a radio frequency signal to the optical cable area based on the identification code and the response frequency band, activates the radio frequency tag installed on the target optical cable and lights up the corresponding LED.

[0020] Compared with the prior art, the beneficial effects achieved by this application are as follows: The present application combines optical time domain detection and specific vibration disturbance patterns to accurately identify target optical cables that are subject to specific vibration disturbances. Compared with traditional marking and manual search methods, the present application improves the accuracy and efficiency of identification.

[0021] The present application dynamically adjusts the vibration mode according to the environmental interference conditions, thereby enhancing the reliability of optical cable identification, effectively distinguishing target optical cables even in complex interference environments, and reducing the impact of external factors on optical cable management and maintenance.

[0022] After installing a radio frequency tag for each optical cable, the present application only needs to activate the corresponding radio frequency tag and passive LED to locate the target optical cable again, thereby improving the efficiency of optical cable identification and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 labor. Among them: Figure 1 A flow chart of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry provided in this application; Figure 2 A schematic diagram of the structure of the optical cable automatic identification system based on wireless radio frequency and optical time domain reflectometry provided in this application; Figure 3 A flow chart of the method for collecting environmental disturbance frequency bands provided in this application. DETAILED DESCRIPTION

[0024] The technical solution of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0025] Example 1 This embodiment introduces an automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry. Figure 1 , the method comprises the following steps: S1: Collect environmental disturbance parameters; set a vibration mode based on the environmental disturbance parameters; The environmental disturbance parameters include environmental disturbance frequency band and signal distortion; The collecting of environmental disturbance parameters includes collecting environmental disturbance frequency bands and determining signal distortion; the collecting of environmental disturbance frequency bands is performed based on optical time domain detection, referring to Figure 3 , specifically including: Injecting a detection pulse into the optical cable and continuously collecting a detection signal, wherein the detection signal is a backscattered Rayleigh signal of the detection pulse in the optical cable; Recording the phase of the detection signal to generate a time series of the phase of the detection signal; The frequency spectrum of the detection signal phase is analyzed based on the time series of the detection signal phase to obtain the environmental disturbance frequency band.

[0026] A short pulse of light signal is sent to the optical cable through a laser light source. These pulses will be reflected and scattered at the uneven medium of the optical cable during transmission. By detecting the phase change of the backward Rayleigh scattered signal, the impact of environmental disturbances on the optical cable can be captured. The time series of the phase is converted into the frequency domain to obtain its spectrum diagram, in which the environmental disturbance frequency band can be identified. For example, the spectrum amplitude threshold is set according to actual needs, and the frequency components in the spectrum diagram with amplitudes higher than the spectrum amplitude threshold together constitute the environmental disturbance frequency band. Alternatively, the environmental disturbance frequency band is extracted based on the mean and standard deviation of the amplitude of each frequency component in the spectrum diagram, for example, all frequency components with amplitudes higher than the average amplitude minus 3 times the standard deviation together constitute the environmental disturbance frequency band.

[0027] The determining of the signal distortion degree specifically includes: A vibration detection experiment is conducted, specifically as follows: randomly select an optical cable and apply a vibration disturbance with a specified frequency to the selected optical cable; perform optical time domain detection on each optical cable respectively, and record the number of optical cables that detect the specified frequency; for any optical cable, the method for detecting the specified frequency is as follows: inject a detection pulse into the optical cable, and continuously collect detection signals to generate a time series of the detection signal phase; based on the time series of the detection signal phase, a frequency spectrum of the detection signal phase is generated, and if there is a frequency component in the frequency spectrum whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the specified frequency is less than a preset deviation threshold, the corresponding optical cable detects the specified frequency; Repeat the vibration detection experiment at least p times, if in at least q vibration detection experiments, the number of optical cables detected with the specified frequency is greater than 1 or equal to 0, the signal distortion is high, otherwise the signal distortion is low. p and q are both positive integers.

[0028] The vibration detection experiment can reflect the collision and vibration transmission between multiple optical cables. If a vibration disturbance of a specified frequency is applied to an optical cable, but the specified frequency is detected in more than one optical cable, it means that there may be unexpected situations such as collision, adhesion, entanglement, etc. between the optical cables, which will interfere with the detection of the applied vibration disturbance; if the specified frequency is not detected in any optical cable, it is because the signal distortion is serious, resulting in the inability to effectively detect the vibration applied to the optical cable through frequency. Common causes of the above-mentioned high signal distortion include large environmental noise, complex periodicity of environmental interference, and multiple optical cables being subject to vibration interference from the same interference source.

[0029] The vibration mode includes the frequency and phase of the vibration signal; setting the vibration mode based on the environmental disturbance parameter includes setting the vibration signal frequency and setting the vibration signal phase; wherein, setting the vibration signal frequency specifically includes: Set an alternative vibration frequency band; the alternative vibration frequency band is the value range of the alternative vibration signal frequency.

[0030] If there is no environmental disturbance frequency band, selecting a frequency from the candidate vibration frequency band as the vibration signal frequency; If there is an environmental disturbance frequency band, determine the optional frequency band; the optional frequency band is a frequency band in the alternative vibration frequency band that does not overlap with the environmental disturbance frequency band; count the total length of the interval of the optional frequency band, and let the ratio of the total length of the interval of the optional frequency band to the length of the interval of the alternative vibration frequency band be d; set the ratio threshold ; If d is greater than , then select a frequency from the optional frequency band as the vibration signal frequency; if d is less than or equal to , then m frequencies are selected from the optional frequency band for superposition, and the superposition frequency is generated as the vibration signal frequency, and there is no integer multiple relationship between any two frequencies among the selected m frequencies. m is a positive integer greater than 1. For example, the optional vibration frequency band is 5-30Hz, and the environmental disturbance frequency band includes 0-5Hz and 10-20Hz, then the optional frequency bands include 6-9Hz and 21-30Hz. Set the proportional threshold ; Calculate d by the total length of the optional frequency band and the length of the alternative vibration frequency band. If d is less than , the environmental disturbance frequency band is too long, while the optional frequency band is shorter; then selecting m frequencies from the optional frequency band for frequency superposition can avoid the situation where only one frequency is selected as the vibration signal frequency and optical time domain detection may not be effective under the premise that there is a certain system error in frequency detection. Let m be equal to 2, then select 2 frequencies from the alternative vibration frequency band for superposition, for example, 7Hz and 23Hz. There is no integer multiple relationship between these two frequencies, which can avoid mutual interference and will not generate harmonics, which is helpful for the subsequent identification and distinction of these two frequency components in the complex spectrum of the detection signal phase. Set the vibration signal frequency as the superposition frequency, and the vibration signal will appear as a complex periodic waveform with a period that is the least common multiple of the periods corresponding to all the frequencies involved in the superposition. Each frequency involved in the superposition corresponds to a clear frequency component in the spectrum of the detection signal phase.

[0031] The setting of the vibration signal phase specifically includes: If the signal distortion is high, the vibration signal phase is set; the method is as follows: Generate a target phase sequence; any element in the target phase sequence corresponds to a cycle of the vibration signal, and the element value is the phase of the vibration signal in the corresponding cycle; the elements in the target phase sequence change periodically; when applying vibration interference to the current optical cable, set the phase of the vibration signal with reference to the target phase sequence. For example, let the vibration signal be a sine wave with an initial phase of 0. A preferred way to set the phase of the vibration signal is to increase the phase by 100% every two cycles. , then the elements in the target phase sequence change periodically, and the change period is 16 times the period of the vibration signal. The present application can avoid random environmental vibration interference during optical time domain detection by setting a vibration mode with a specific frequency. By identifying a pre-set vibration frequency, the influence of random interference that does not have a stable frequency can be effectively screened out, such as natural noises such as wind and rain, ground vibrations caused by passing vehicles, and interference to optical cables caused by nearby people walking and construction activities.

[0032] Furthermore, the present application can avoid periodic environmental vibration interference during optical time domain detection by setting a vibration mode with multiple frequencies superimposed. By setting a vibration mode with multiple frequencies superimposed or frequency hopping, the superimposed frequencies can be identified in the optical time domain detection, thereby screening out environmental interference that does not have the same frequency characteristics, such as the operation of mechanical equipment (such as the periodic operation of equipment such as pumps and compressors), and power system interference (such as the 50Hz power frequency and its harmonics in the power grid) to the optical time domain detection. The interference has a stable frequency range.

[0033] Furthermore, the present application can ensure the recognition accuracy of the current optical cable in the case of severe signal distortion by setting a vibration mode including a phase change rule. Setting the phase of the vibration signal can provide a recognizable phase feature for optical time domain detection, avoiding the problem of insufficient accuracy of only detecting the frequency of the vibration signal in an environment with high signal distortion.

[0034] S2: Select an optical cable without a radio frequency tag installed as the current optical cable; apply vibration interference to the current optical cable based on the vibration mode; specifically include: generating a vibration signal based on the set vibration mode; applying the vibration signal to the current optical cable.

[0035] S3: Identify the current optical cable based on the optical time domain detection and the vibration interference, and obtain the optical cable information of the current optical cable; Identifying the current optical cable based on optical time domain detection and the vibration interference specifically includes: Injecting a detection pulse into each optical cable respectively, and continuously collecting detection signals to generate a time series of the detection signal phase of each optical cable; generating a frequency spectrum of the phase of the detection signal of each optical cable based on the time series of the phase of the detection signal; When the vibration signal frequency is a single frequency, if there is a frequency component corresponding to the vibration signal frequency in the frequency spectrum of the detection signal phase of any optical cable, the corresponding optical cable is marked as the first pending optical cable; the method for judging whether there is a frequency component corresponding to the vibration signal frequency in the frequency spectrum is as follows: if there is a frequency component in the frequency spectrum whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the vibration signal frequency is less than a preset deviation threshold, then there is a frequency component corresponding to the vibration signal frequency in the frequency spectrum; When the vibration signal frequency is a superposition frequency, if the frequency spectrum of the detection signal phase of any optical cable includes frequency components corresponding to each frequency participating in the superposition, the corresponding optical cable is marked as the first optical cable to be determined; wherein, the method of judging whether the frequency spectrum includes frequency components corresponding to any frequency participating in the superposition is as follows: if there is a frequency component in the frequency spectrum whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the frequency participating in the superposition is less than a preset deviation threshold, then there is a frequency component corresponding to the frequency in the frequency spectrum; If there is only one first pending optical cable, the first pending optical cable is the current optical cable.

[0036] When an external vibration signal is applied to the optical cable, it will cause physical deformation of the optical cable (such as expansion or bending). This deformation will change the refractive index and optical path of the area, causing the detection signal passing through the area to change in phase. If the applied vibration is a periodic signal (such as a sine wave), the physical deformation of the optical cable is also periodic, so it will produce corresponding periodic phase modulation on the detection signal, and the frequency of its phase change is the same as the frequency of the applied vibration signal.

[0037] Identifying the current optical cable based on optical time domain detection and the vibration interference also includes: If there are at least two first optical cables to be determined, phase demodulation is performed on the time series of the detection signal phase of each first optical cable to be determined to obtain the disturbance signal phase of each first optical cable to be determined at different time points, and the disturbance signal phase of each first optical cable to be determined is arranged into a disturbance phase sequence in time sequence; the time difference between any two adjacent disturbance signal phases in the disturbance phase sequence is equal to one period of the vibration signal; The cross-correlation coefficients between the target phase sequence and the disturbance phase sequence of each first optical cable to be determined at different lag times are calculated respectively; the cross-correlation coefficient is used to measure the similarity of two time series at any lag time. Lag time refers to the advance or delay of one time series relative to another time series in time. By calculating the cross-correlation coefficients at different lag times, it is determined whether there is a lag relationship between the two time series and what the specific lag time of the lag relationship is.

[0038] Setting a correlation threshold; if there is a lag time such that the mutual correlation coefficient between the disturbance phase sequence of any first pending optical cable and the target phase sequence is greater than the correlation threshold, marking the corresponding first pending optical cable as a second pending optical cable; If there is only one second pending optical cable, the second pending optical cable is the current optical cable.

[0039] By continuously tracking the phase of the disturbance signal of each first pending optical cable, the present application can effectively identify the current optical cable in which the disturbance is caused by a vibration signal with a specific phase change law, thereby screening out other optical cables whose phase change frequency is close to that of the current optical cable due to unexpected environmental interference. For example, the nonlinear effect of the optical fiber and the electromagnetic interference of nearby electrical equipment may cause the phase change of the backward Rayleigh scattering signal in the optical cable. When the mutual correlation coefficient between the disturbance phase sequence and the target phase sequence of any first pending optical cable is greater than the correlation threshold, it means that the phase change of the detection signal of the optical cable is linearly correlated with the phase change of the vibration signal, that is, the phase change of the detection signal of the optical cable is determined by the vibration signal, rather than by other environmental factors that do not have the same phase change law as the vibration signal.

[0040] As mentioned above, the impact of vibration signals on optical cables will cause phase modulation of the detection signal; the phase information of the external vibration signal can be extracted from the phase change law of the detection signal through appropriate phase demodulation technology, such as phase demodulation technology such as phase-locked amplifier and Hilbert transform. Phase information provides higher resolution and sensitivity than amplitude information and frequency information, which helps to detect and identify vibration signals more accurately.

[0041] Identifying the current optical cable based on optical time domain detection and the vibration interference also includes: If there are at least two second pending optical cables, the mutual correlation coefficients of the disturbance phase sequences of any two second pending optical cables at different lag times are calculated; the lag time that makes the mutual correlation coefficients of the disturbance phase sequences of the two second pending optical cables greater than the correlation threshold is determined, and the phase change sequence of the two second pending optical cables is judged based on the lag time; all the second pending optical cables are sorted according to the phase change sequence, and the second pending optical cable with the first phase change is the current optical cable.

[0042] The present application confirms the current optical cable among multiple second optical cables by determining the second pending optical cable that first undergoes phase change, thereby solving the problem that the phase change law of the detection signal of the target optical cable is transmitted to other optical cables due to physical contact such as collision, entanglement, and accidental close contact of the optical cable. Since the perturbation phase sequence of each second pending optical cable is linearly related to the target phase sequence, the perturbation phase sequences of any two second pending optical cables are also linearly related. By finding the lag time between the perturbation phase sequences of the two second pending optical cables, the order in which the phase changes of the two second pending optical cables occur can be determined. For example, if the perturbation phase sequence of the second pending optical cable A is linearly related to the perturbation phase sequence change of the second pending optical cable B under the condition that the lag time is greater than 0, the phase change of the second pending optical cable B precedes that of the second pending optical cable A. Since the current optical cable is directly disturbed by the vibration signal and the phase change of the detection signal occurs, the other second pending optical cables are directly or indirectly disturbed by the current optical cable, thereby causing the phase change of the detection signal. Therefore, the second pending optical cable that first undergoes phase change is the current optical cable.

[0043] The optical cable information includes the optical cable number and the optical cable attribute information; the optical cable attribute information includes the optical cable identification information, key routing point information, and connection port information; If the target optical cable is a faulty optical cable or an optical cable with a changed route, etc., it is necessary to identify the target optical cable among multiple optical cables in order to perform fault inspection and repair, route update, etc. The optical cable attribute information is used to quickly query the corresponding optical cable number. For example, the optical cable identification information includes the optical cable name, manufacturer name, optical cable model, production date, batch information, etc.; the key routing point information includes the node type, node number, node coordinates, etc. of important nodes such as the junction box, distribution frame, and junction box passed during the laying of the optical cable; the connection port information includes the physical interface information between the optical cable and other devices or optical cables, including port number, port type, port status, and connection object (such as another optical cable, switch, router, etc.); if part of the optical cable attribute information of the target optical cable is known, the corresponding database can be accessed to quickly retrieve the optical cable number of the target optical cable.

[0044] S4: Install a radio frequency tag for the current optical cable; bind the radio frequency tag to the optical cable information of the current optical cable; Any RFID tag has a unique identification code and a corresponding response frequency band; Binding the radio frequency tag to the optical cable information of the current optical cable, specifically including: binding the optical cable number of the current optical cable to the identification code and response frequency band of the radio frequency tag, and sending them to the cloud server.

[0045] The identification code is a unique ID number for each RFID tag. The response frequency band is the frequency range of the radio frequency signal that can activate the radio frequency tag; the radio frequency tag installed for each optical cable has a different response frequency band.

[0046] S5: Repeat S2 to S4 until the RFID tags of all optical cables are installed; S6: Obtaining the optical cable information of the target optical cable, and querying the radio frequency tag corresponding to the target optical cable based on the optical cable information; specifically including: Querying the optical cable number of the target optical cable based on at least one piece of optical cable attribute information; The identification code of the radio frequency tag bound to the cable number of the target optical cable and the corresponding response frequency band are queried through the cloud server.

[0047] S7: Activate the radio frequency tag corresponding to the target optical cable to indicate the location of the target optical cable.

[0048] Any radio frequency tag includes an energy collection circuit and a passive LED; the radio frequency tag corresponding to the activated target optical cable is used to indicate and locate the target optical cable, specifically including: Sending a radio frequency signal to the area where the target optical cable is located; the frequency of the radio frequency signal is within the response frequency band of the radio frequency tag installed on the target optical cable; the radio frequency signal includes a coding instruction, and the coding instruction includes an identification code; The RFID tag installed on the target optical cable responds to the RFID signal, parses the coding instruction, obtains the identification code and determines whether the identification code is correct; if correct, the energy collection circuit is activated; the energy collection circuit converts the energy of the RFID signal into direct current and lights up the corresponding passive LED.

[0049] After receiving the RF signal, the RFID tag converts the RF signal energy into electrical energy through its own antenna to provide energy for the circuit inside the tag; then it demodulates the RF signal and extracts the coded instructions. The chip inside the tag analyzes the coded instructions. If the identification code in the coded instructions is consistent with its own identification code, the identification code is correct and the energy collection circuit is activated. The energy collection circuit rectifies and filters the RF energy received by the RFID tag and converts it into direct current that can drive the LED, thereby making the LED light up and realizing the indication and positioning of the target optical cable.

[0050] Example 2 This embodiment is the second embodiment of the present application; it is based on the same inventive concept as embodiment 1, and Figure 2 This embodiment introduces an optical cable automatic identification system based on wireless radio frequency and optical time domain reflection, including a vibrator module, an optical time domain detection module, a radio frequency tag module, a cloud server module, and a mobile terminal module; wherein: The vibrator module is used to apply vibration to the optical cable; the vibrator module includes a control unit and a vibrator. The control unit controls the vibrator based on a preset frequency and phase, and the vibrator generates a vibration signal with a specified frequency and phase.

[0051] The optical time domain detection module is used to perform optical time domain detection on the optical cable; the optical time domain detection module includes a light source, a detector, an optical time domain reflectometer, and a data processing unit; the light source is used to generate a detection pulse and inject it into the optical cable; the detector is used to receive the detection signal; the optical time domain reflectometer is used to extract the phase of the detection signal; the data processing unit is used to generate a time series of the detection signal phase, and perform spectrum analysis on the detection signal phase to identify the frequency and phase of the vibration signal. The data processing unit is also configured with relevant algorithms for calculating the environmental interference frequency band and signal distortion; The cloud server module includes a database and a cloud computing unit. The database is used to store the cable number and cable attribute information of each optical cable, as well as the identification code and response frequency band of the radio frequency tag bound to each optical cable. The cloud computing unit sets the vibration mode based on the environmental disturbance frequency band and signal distortion, and sends the command to control the vibration mode to the control unit of the vibrator module. The cloud computing unit also identifies the current optical cable based on the frequency and phase of the vibration signal.

[0052] The radio frequency tag module is used to indicate and locate the target optical cable; the radio frequency tag module includes a radio frequency tag installed on each optical cable, and each radio frequency tag includes an energy collection circuit and a passive LED.

[0053] The mobile terminal module includes a mobile terminal device and a radio frequency reader; wherein the mobile terminal device is used to send the optical cable attribute information of the target optical cable to the cloud server module, and receive the identification code and response frequency band of the radio frequency tag bound to the target optical cable sent by the cloud server module; the radio frequency reader sends a radio frequency signal to the optical cable area based on the identification code and response frequency band, activates the radio frequency tag installed on the target optical cable and lights up the corresponding LED. The mobile terminal device is used to bind the optical cable number of each optical cable with the identification code and response frequency band of the corresponding radio frequency tag, and then send it to the cloud server module.

[0054] The specific functions of the above modules are realized by referring to the relevant contents of the optical cable automatic identification method based on wireless radio frequency and optical time domain reflection described in Example 1, which will not be described in detail.

[0055] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0056] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose and scope of protection of the present application, all of which are within the protection of the present application.

Claims

1. An automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry, characterized in that: The following steps are involved: S1: Collect environmental disturbance parameters; set a vibration mode based on the environmental disturbance parameters; S2: selecting an optical cable without a radio frequency tag installed as the current optical cable; applying vibration interference to the current optical cable based on the vibration mode; S3: Identify the current optical cable based on the optical time domain detection and the vibration interference, and obtain the optical cable information of the current optical cable; S4: Install a radio frequency tag for the current optical cable; bind the radio frequency tag to the optical cable information of the current optical cable; S5: Repeat S2 to S4 until the RFID tags of all optical cables are installed; S6: Obtaining the optical cable information of the target optical cable, and querying the radio frequency tag corresponding to the target optical cable based on the optical cable information; S7: Activate the radio frequency tag corresponding to the target optical cable to indicate and locate the target optical cable.

2. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 1, characterized in that: The environmental disturbance parameters include environmental disturbance frequency band and signal distortion; The collecting of environmental disturbance parameters includes collecting environmental disturbance frequency bands; The collecting of environmental disturbance frequency bands is performed based on optical time domain detection, and specifically includes: Injecting a detection pulse into the optical cable and continuously collecting a detection signal, wherein the detection signal is a backscattered Rayleigh signal of the detection pulse in the optical cable; Recording the phase of the detection signal to generate a time series of the phase of the detection signal; The frequency spectrum of the detection signal phase is analyzed based on the time series of the detection signal phase to obtain the environmental disturbance frequency band.

3. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 2, characterized in that: The collecting of environmental disturbance parameters also includes determining signal distortion, the method is as follows: A vibration detection experiment is conducted, specifically as follows: randomly selecting an optical cable and applying a vibration disturbance with a specified frequency to the selected optical cable; performing optical time domain detection on each optical cable respectively, and recording the number of optical cables for which the specified frequency is detected; For any optical cable, the method for detecting the specified frequency is as follows: injecting a detection pulse into the optical cable, and continuously collecting detection signals to generate a time series of the detection signal phase; generating a frequency spectrum of the detection signal phase based on the time series of the detection signal phase, if there is a frequency component in the frequency spectrum whose amplitude is greater than a preset amplitude threshold and whose frequency difference with the specified frequency is less than a preset deviation threshold, the corresponding optical cable detects the specified frequency; The vibration detection experiment is repeated at least p times. If the number of optical cables with the specified frequency detected in at least q vibration detection experiments is greater than 1 or equal to 0, the signal distortion is high; otherwise, the signal distortion is low.

4. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 3, characterized in that: The vibration mode includes the frequency and phase of the vibration signal; and setting the vibration mode based on the environmental disturbance parameter includes setting the frequency of the vibration signal, the method being as follows: Set an alternative vibration frequency band; the alternative vibration frequency band is a value range of an alternative vibration signal frequency; If there is no environmental disturbance frequency band, selecting a frequency from the candidate vibration frequency band as the vibration signal frequency; If there is an environmental disturbance frequency band, determine the optional frequency band; the optional frequency band is a frequency band in the alternative vibration frequency band that does not overlap with the environmental disturbance frequency band; count the total length of the interval of the optional frequency band, and let the ratio of the total length of the interval of the optional frequency band to the length of the interval of the alternative vibration frequency band be d; set the ratio threshold ; If d is greater than , then select a frequency from the optional frequency band as the vibration signal frequency; if d is less than or equal to , then m frequencies are selected from the optional frequency band for superposition, and the superposition frequency is generated as the vibration signal frequency, and among the selected m frequencies, there is no integer multiple relationship between any two frequencies.

5. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 4, characterized in that: Setting the vibration mode based on the environmental disturbance parameter also includes setting the vibration signal phase, the method is as follows: If the signal distortion is high, the vibration signal phase is set, specifically including: Generate a target phase sequence; any element in the target phase sequence corresponds to a cycle of the vibration signal, and the element value is the phase of the vibration signal in the corresponding cycle; the elements in the target phase sequence change periodically; when applying vibration interference to the current optical cable, set the phase of the vibration signal with reference to the target phase sequence.

6. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 5, characterized in that: Identifying the current optical cable based on optical time domain detection and the vibration interference specifically includes: Injecting a detection pulse into each optical cable respectively and continuously collecting detection signals; generating a time series of the detection signal phase of each optical cable; generating a frequency spectrum of the phase of the detection signal of each optical cable based on the time series of the phase of the detection signal; If the vibration signal frequency is a single frequency, and there is a frequency component corresponding to the vibration signal frequency in the frequency spectrum of the detection signal phase of any optical cable, then the corresponding optical cable is marked as the first undetermined optical cable; When the vibration signal frequency is the superposition frequency, and the frequency spectrum of the detection signal phase of any optical cable includes frequency components corresponding to each frequency involved in the superposition, the corresponding optical cable is marked as the first pending optical cable; if there is only one first pending optical cable, the first pending optical cable is the current optical cable.

7. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 6, characterized in that: Identifying the current optical cable based on optical time domain detection and the vibration interference also includes: If there are at least two first optical cables to be determined, phase demodulation is performed on the time series of the detection signal phase of each first optical cable to be determined to obtain the disturbance signal phase of each first optical cable to be determined at different time points, and the disturbance signal phase of each first optical cable to be determined is arranged into a disturbance phase sequence in time sequence; the time difference between any two adjacent disturbance signal phases in the disturbance phase sequence is equal to one period of the vibration signal; The cross-correlation coefficients between the target phase sequence and the disturbance phase sequence of each first pending optical cable at different lag times are calculated respectively; a correlation threshold is set; if there is a lag time such that the cross-correlation coefficient between the disturbance phase sequence of any first pending optical cable and the target phase sequence is greater than the correlation threshold, the corresponding first pending optical cable is marked as a second pending optical cable; if there is only one second pending optical cable, the second pending optical cable is the current optical cable.

8. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 7, characterized in that: Identifying the current optical cable based on optical time domain detection and the vibration interference also includes: If there are at least two second pending optical cables, the mutual correlation coefficients of the disturbance phase sequences of any two second pending optical cables at different lag times are calculated; the lag time that makes the mutual correlation coefficients of the disturbance phase sequences of the two second pending optical cables greater than the correlation threshold is determined, and the phase change sequence of the two second pending optical cables is judged based on the lag time; all the second pending optical cables are sorted according to the phase change sequence, and the second pending optical cable with the first phase change is the current optical cable.

9. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 8, characterized in that: The optical cable information includes the optical cable number and the optical cable attribute information; the optical cable attribute information includes the optical cable identification information, key routing point information, and connection port information; Any RFID tag has a unique identification code and a corresponding response frequency band; Binding the radio frequency tag to the optical cable information of the current optical cable, specifically including: binding the optical cable number of the current optical cable to the identification code and the response frequency band of the radio frequency tag, and sending them to the cloud server; The method of querying the radio frequency tag corresponding to the target optical cable based on the optical cable information specifically includes: Querying the optical cable number of the target optical cable based on at least one piece of optical cable attribute information; The identification code of the radio frequency tag bound to the cable number of the target optical cable and the corresponding response frequency band are queried through the cloud server.

10. The optical cable automatic identification method based on wireless radio frequency and optical time domain reflectometry according to claim 9, characterized in that: Any radio frequency tag includes an energy collection circuit and a passive LED; the radio frequency tag corresponding to the activated target optical cable is used to indicate and locate the target optical cable, specifically including: Sending a radio frequency signal to the area where the target optical cable is located; the frequency of the radio frequency signal is within the response frequency band of the radio frequency tag installed on the target optical cable; the radio frequency signal includes a coding instruction, and the coding instruction includes an identification code; The RFID tag installed on the target optical cable responds to the RFID signal, parses the coding instruction, obtains the identification code and determines whether the identification code is correct; if correct, the energy collection circuit is activated; the energy collection circuit converts the energy of the RFID signal into direct current and lights up the corresponding passive LED.

11. An automatic optical cable identification system based on wireless radio frequency and optical time domain reflectometry, which is used to implement the automatic optical cable identification method based on wireless radio frequency and optical time domain reflectometry as claimed in any one of claims 1 to 10, characterized in that: It includes a vibrator module, an optical time domain detection module, a radio frequency tag module, a cloud server module, and a mobile terminal module; wherein: The vibrator module is used to apply vibration to the optical cable, and includes a control unit and a vibrator; the control unit controls the vibrator to generate a vibration signal based on a preset frequency and phase; The optical time domain detection module is used to perform optical time domain detection on the optical cable; The cloud server module includes a database and a cloud computing unit; wherein the database is used to store the optical cable number, the optical cable attribute information, and the identification code and response frequency band of the radio frequency tag bound to each optical cable; the cloud computing unit is used to set the vibration mode and send the command for controlling the vibration mode to the control unit; The radio frequency tag module is used to indicate and locate the target optical cable; The mobile terminal module includes a mobile terminal device and a radio frequency reader / writer; wherein the mobile terminal device queries the identification code and response frequency band of the radio frequency tag bound to the target optical cable from the cloud server module; the radio frequency reader / writer sends a radio frequency signal to the area where the optical cable is located based on the identification code and the response frequency band, activates the radio frequency tag installed on the target optical cable and lights up the corresponding LED.

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