CN107493132B - Fault points of optical cables accurate positioning method and system - Google Patents
Fault points of optical cables accurate positioning method and system Download PDFInfo
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- CN107493132B CN107493132B CN201710888958.2A CN201710888958A CN107493132B CN 107493132 B CN107493132 B CN 107493132B CN 201710888958 A CN201710888958 A CN 201710888958A CN 107493132 B CN107493132 B CN 107493132B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0771—Fault location on the transmission path
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Abstract
The present invention discloses a kind of fault points of optical cables accurate positioning method and system, obtains the disturbance back scattering curve data that optical fibre in optical cable is tested in the case of disturbance, and the undisturbed back scattering curve data without optical fibre in optical cable tested in the case of disturbance first；Disturbance back scattering curve data and undisturbed back scattering curve data are filtered using wavelet de-noising algorithm respectively；Respectively to after filtering processing disturbance back scattering curve data and undisturbed back scattering curve data using wavelet decomposition denoise, then to wavelet decomposition denoising after data carry out signature analysis, disturbance location is determined by signature analysis.The present invention using unperturbed moving noise characteristic quantity to have disturbing signal carry out wavelet filtering processing, signal characteristic can also be successfully reserved after denoising, and signal characteristic is extracted using wavelet decomposition, disturbance location is determined by signal characteristic, to quickly accurately navigate to the position of fault points of optical cables.
Description
Technical field
The present invention relates to Cable's Fault detection technique fields, and in particular to a kind of fault points of optical cables accurate positioning method and is
System.
Background technique
With " broadband China " implementation, fiber optic communication is gradually popularized, and optical fiber cable is throughout China
Each city.However optical cable is mostly layed in underground or aerial, then the maintenance and management of magnanimity optical cable becomes problem.
Especially when aging, corollary failure or artificial damage cause Cable's Fault, severe jamming information-intensive society is effectively run, is influenced
Information security.The position with fault point is so quickly checked, failure light is repaired and restored within the shortest time
Cable becomes most important.
Usually used at present is OTDR to carry out the positioning of fault points of optical cables, but because of the particularity of optical cable laying,
The length of optical cable and actual geographic distance are different, and when there is Cable's Fault, the length of optical cable can only be measured with OTDR,
But OTDR can not inform the actual geographic position where fault point.Currently, optical cable generaI investigation instrument on the market does not have event generally
Hinder point location function, even if having the optical cable generaI investigation instrument of localization of fault function, positioning accuracy is not high enough, and position error compares
Greatly.The optical cable generaI investigation general application method of instrument of localization of fault is side of the Field Force by such as light curved optical cable of disturbance optical cable
Formula, after finding the disturbance location of optical cable, then the method for carrying out Step wise approximation fault points of optical cables.Therefore, to the accurate of disturbance location
Positioning is the key that concerning the accuracy and rapidity for arriving Cable's Fault point location.The present invention provides one kind in fault points of optical cables
The Precision Orientation Algorithm of disturbance location in position fixing process.
Summary of the invention
Have the problem that method is low to the search efficiency of fault points of optical cables and error is big for current, the present invention provides
A kind of accurate positioning method and system of the disturbance location in fault points of optical cables position fixing process, enable efficient and accurate
The disturbance location to optical cable is found, to quickly accurately navigate to the position of fault points of optical cables.
The present invention provides a kind of fault points of optical cables accurate positioning method, and the fault points of optical cables accurate positioning method includes such as
Lower step:
S1, the disturbance back scattering curve data for obtaining tested optical fibre in optical cable in the case of disturbance, and without disturbance feelings
The undisturbed back scattering curve data of optical fibre in optical cable is tested under condition；
S2, wavelet de-noising algorithm is used to disturbance back scattering curve data and undisturbed back scattering curve data respectively
It is filtered；
S3, respectively to after filtering processing disturbance back scattering curve data and undisturbed back scattering curve data use
Wavelet decomposition denoising, then signature analysis is carried out to the data after wavelet decomposition denoising, disturbance location is determined by signature analysis.
A kind of fault points of optical cables Precise Position System, the fault points of optical cables accurate positioning method include following function mould
Block:
Data acquisition module, for obtain disturbance in the case of be tested optical fibre in optical cable disturbance back scattering curve data,
And the undisturbed back scattering curve data without being tested optical fibre in optical cable in the case of disturbance；
Module is filtered, for adopting respectively to disturbance back scattering curve data and undisturbed back scattering curve data
It is filtered with wavelet de-noising algorithm；
Positioning analysis module, for respectively to after the disturbance back scattering curve data and undisturbed after filtering processing to dissipate
It penetrates curve data to denoise using wavelet decomposition, then signature analysis is carried out to the data after wavelet decomposition denoising, pass through signature analysis
Determine disturbance location.
Fault points of optical cables accurate positioning method and system of the present invention, characteristic quantity using unperturbed moving noise is to thanksing for your hospitality
Dynamic signal carries out wavelet filtering processing, signal characteristic can also be successfully reserved after denoising, and can be fine based on wavelet decomposition
Reservation jump signal edge features characteristic, signal characteristic is extracted using wavelet decomposition, is come by signal characteristic true
Determine disturbance location, enable efficient and accurately find disturbance location to optical cable, to quickly accurately navigate to light
The position of cable fault point.
Detailed description of the invention
Fig. 1 is the flow diagram of fault points of optical cables accurate positioning method of the present invention；
Fig. 2 is the sub-process block diagram of step S1 in Fig. 1；
Fig. 3 is the sub-process block diagram of step S3 in Fig. 1.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated, it should be understood that and the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention provides a kind of fault points of optical cables accurate positioning method, as shown in Figure 1, the fault points of optical cables is accurately positioned
Method includes the following steps:
S1, the disturbance back scattering curve data for obtaining tested optical fibre in optical cable in the case of disturbance, and without disturbance feelings
The undisturbed back scattering curve data of optical fibre in optical cable is tested under condition.
Wherein, as shown in Fig. 2, the step S1 include it is following step by step:
S11, the undisturbed back scattering curve that two groups of tested optical fibre in optical cable are obtained under the situation of no disturbance optical cable
Data obtain the disturbance back scattering curve data of one group of tested optical fibre in optical cable under the situation of disturbance optical cable；
S12, two groups of undisturbed back scattering curve datas A2, A1 are made the difference, and is normalized to obtain noise signal
Array of data B1；
S13, disturbance back scattering curve data A3 and any one group of undisturbed back scattering curve data A1 or A2 are done
Difference, and be normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
And in actual operation, undisturbed back scattering curve data A1, A2 are successively extracted according to the sequencing of time,
And disturbance back scattering curve data A3, wherein rear extraction undisturbed back scattering curve data A2 and disturbance after to
The undisturbed back scattering curve data A1 and disturbance that interval time between scattering curve data A3 formerly extracts relatively are backward
Interval time between scattering curve data A3 is shorter, and otherness is smaller, therefore the accuracy to be further ensured that data, described
Preferably by disturbance back scattering curve data A3 and in the undisturbed back scattering curve of rear extraction in noisy data acquiring unit
Data A2 makes the difference, and is normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
S2, wavelet de-noising algorithm is used to disturbance back scattering curve data and undisturbed back scattering curve data respectively
It is filtered.
It handles to obtain array of data C1 and C2 specifically, array of data B1 and B2 are passed through wavelet de-noising respectively, then C1 is
Data after undisturbed wavelet de-noising, C2 are to have data after disturbance wavelet de-noising.
S3, respectively to after filtering processing disturbance back scattering curve data and undisturbed back scattering curve data use
Wavelet decomposition denoising, then signature analysis is carried out to the data after wavelet decomposition denoising, disturbance location is determined by signature analysis.
Wherein, as shown in figure 3, the step S3 include it is following step by step:
S31, array of data C1 is done into the data after 4 layers of wavelet decomposition obtain 4 layers of decomposition using haar wavelet basis respectively, from
Each layer noise characteristic amount t1, t2, t3 and t4 are extracted in data after 4 layers of wavelet decomposition respectively；
Specifically, above-mentioned noise is mainly white noise, and the small big feature below in front is presented, therefore, each layer I
Calculate front it is some points (such as preceding 200 points) noise variance δ, then using 3 δ as front spot noise characteristic quantity, so
The noise variance δ 1 of last some points (200 points after such as) is calculated afterwards, then the characteristic quantity by 3 δ 1 as subsequent point, by
Exponentially decay in a fiber in light, under identical noise conditions, therefore signal-to-noise ratio index decreased passes through 1 two points of 3 δ and 3 δ
Can be obtained with the curve matching of index each layer of characteristic quantity curve of noise to get to each layer noise characteristic amount t1,
T2, t3 and t4.
S32, array of data C2 is done into the data after 4 layers of wavelet decomposition obtain 4 layers of decomposition using haar wavelet basis respectively, it will
Data after each layer of wavelet decomposition are gone respectively using noise characteristic amount t1, t2, t3 and the t4 extracted in step S31
It makes an uproar, array of data D1, D2, D3 and D4 after obtaining filtering and noise reduction；
In S33, every layer of wavelet decomposition data array D1, D2, D3 and the D4 obtained after filtering and noise reduction, the layer is found respectively
The characteristic quantity of upper disturbance location, the extracting method of this feature amount is consistent with the extracting method of above-mentioned noise characteristic amount, according to convolution
Data length transformation the characteristics of, the position number in array of data where each layer of characteristic quantity is reverted into initial data number
Position number where in group C2, is always obtained four data P1, P2, P3 and P4；
S34, it filters out in data P1, P2, P3 and P4 with the apparent data of other data differences, remaining data is done into average place
Reason obtains P, and the disturbance location of outer bound pair optical cable can be obtained.
Based on above-mentioned fault points of optical cables accurate positioning method, the present invention also provides a kind of fault points of optical cables to be accurately positioned system
System, the fault points of optical cables accurate positioning method includes following functional module:
Data acquisition module, for obtain disturbance in the case of be tested optical fibre in optical cable disturbance back scattering curve data,
And the undisturbed back scattering curve data without being tested optical fibre in optical cable in the case of disturbance.
Specifically, the data acquisition module includes following functions unit:
Initial data acquisition unit, for obtaining the nothing of two groups of tested optical fibre in optical cable under the situation of no disturbance optical cable
Back scattering curve data is disturbed, the disturbance back scattering that one group of tested optical fibre in optical cable is obtained under the situation of disturbance optical cable is bent
Line number evidence.
Noise data acquiring unit for making the difference to two groups of undisturbed back scattering curve datas A2, A1, and carries out normalizing
Change obtains the array of data B1 of noise signal；
Noisy data acquiring unit, for disturbance back scattering curve data A3 and any one group of undisturbed back scattering
Curve data A1 or A2 make the difference, and are normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
Module is filtered, for adopting respectively to disturbance back scattering curve data and undisturbed back scattering curve data
It is filtered with wavelet de-noising algorithm；Specifically, the filtering processing module for leading to array of data B1 and B2 respectively
It crosses small echo noise reduction process and obtains array of data C1 and C2, then C1 is data after undisturbed wavelet de-noising, and C2 is to have disturbance small echo drop
Data after making an uproar.
Positioning analysis module, for respectively to after the disturbance back scattering curve data and undisturbed after filtering processing to dissipate
It penetrates curve data to denoise using wavelet decomposition, then signature analysis is carried out to the data after wavelet decomposition denoising, pass through signature analysis
Determine disturbance location.
Wherein, the positioning analysis module includes following functions unit:
Noise characteristic amount extraction unit is obtained for array of data C1 to be done 4 layers of wavelet decomposition using haar wavelet basis respectively
Data after decomposing to 4 layers, extract each layer noise characteristic amount t1, t2, t3 respectively from the data after 4 layers of wavelet decomposition
And t4；
Filtering and noise reduction unit obtains 4 layers points for array of data C2 to be done 4 layers of wavelet decomposition using haar wavelet basis respectively
Data after solution, by the data after each layer of wavelet decomposition using noise characteristic amount t1, t2, the t3 extracted in step S31 and
T4 is denoised respectively, array of data D1, D2, D3 and D4 after obtaining filtering and noise reduction；
Data convert unit, every layer of wavelet decomposition data array D1, D2, D3 and D4 for being obtained after filtering and noise reduction
In, the characteristic quantity of this layer of upper disturbance location is found respectively, also by the position number where each layer of characteristic quantity in array of data
Position number of the original where into initial data array C2, is always obtained four data P1, P2, P3 and P4；
Removal of impurities positioning unit will be remained for filtering out in data P1, P2, P3 and P4 with the apparent data of other data differences
Remainder evidence does average treatment and obtains P, and the disturbance location of outer bound pair optical cable can be obtained.
Fault points of optical cables accurate positioning method and system of the present invention, characteristic quantity using unperturbed moving noise is to thanksing for your hospitality
Dynamic signal carries out wavelet filtering processing, signal characteristic can also be successfully reserved after denoising, and can be fine based on wavelet decomposition
Reservation jump signal edge features characteristic, signal characteristic is extracted using wavelet decomposition, is come by signal characteristic true
Determine disturbance location, enable efficient and accurately find disturbance location to optical cable, to quickly accurately navigate to light
The position of cable fault point.
Apparatus above embodiment and embodiment of the method are one-to-one, the simple places of Installation practice, referring to method reality
Apply example.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to functionality in the above description.This
A little functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Specially
Industry technical staff can use different methods to achieve the described function each specific application, but this realization is not
It should be more than the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory, memory, read-only memory,
Institute is public in electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In the storage medium for any other forms known.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of fault points of optical cables accurate positioning method, which is characterized in that the fault points of optical cables accurate positioning method includes such as
Lower step:
In the case of S1, the disturbance back scattering curve data for obtaining tested optical fibre in optical cable in the case of disturbance, and no disturbance
The undisturbed back scattering curve data of tested optical fibre in optical cable；
S2, disturbance back scattering curve data and undisturbed back scattering curve data are carried out using wavelet de-noising algorithm respectively
Filtering processing；
S3, respectively to after filtering processing disturbance back scattering curve data and undisturbed back scattering curve data use small echo
Denoising is decomposed, then signature analysis is carried out to the data after wavelet decomposition denoising, disturbance location is determined by signature analysis.
2. fault points of optical cables accurate positioning method according to claim 1, which is characterized in that the step S1 includes following point
Step:
S11, the undisturbed back scattering curve data that two groups of tested optical fibre in optical cable are obtained under the situation of no disturbance optical cable,
The disturbance back scattering curve data of one group of tested optical fibre in optical cable is obtained under the situation of disturbance optical cable；
S12, two groups of undisturbed back scattering curve datas A2, A1 are made the difference, and is normalized to obtain the data of noise signal
Array B1；
S13, disturbance back scattering curve data A3 and any one group of undisturbed back scattering curve data A1 or A2 are made the difference, and
It is normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
3. fault points of optical cables accurate positioning method according to claim 2, which is characterized in that
By disturbance back scattering curve data A3 and in the undisturbed back scattering curve data A2 of rear extraction in the step S13
It makes the difference, and is normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
4. fault points of optical cables accurate positioning method according to claim 2, which is characterized in that the step S2 specifically:
S2, it array of data B1 and B2 is passed through to wavelet de-noising respectively handles to obtain array of data C1 and C2, then C1 is that undisturbed is small
Data after wave noise reduction, C2 are to have data after disturbance wavelet de-noising.
5. fault points of optical cables accurate positioning method according to claim 4, which is characterized in that the step S3 includes following point
Step:
S31, array of data C1 is done into the data after 4 layers of wavelet decomposition obtain 4 layers of decomposition using haar wavelet basis respectively, from 4 layers
Each layer noise characteristic amount t1, t2, t3 and t4 are extracted in data after wavelet decomposition respectively；
S32, array of data C2 is done into the data after 4 layers of wavelet decomposition obtain 4 layers of decomposition using haar wavelet basis respectively, it will be each
Data after layer wavelet decomposition are denoised respectively using noise characteristic amount t1, t2, t3 and the t4 extracted in step S31, are obtained
Array of data D1, D2, D3 and D4 after to filtering and noise reduction；
In S33, every layer of wavelet decomposition data array D1, D2, D3 and the D4 obtained after filtering and noise reduction, finds disturbed on the layer respectively
The characteristic quantity of dynamic position, the position number where each layer of characteristic quantity in array of data is reverted in initial data array C2
Four data P1, P2, P3 and P4 are always obtained in the position number at place；
S34, it filters out in data P1, P2, P3 and P4 with the apparent data of other data differences, remaining data is done into average treatment and is obtained
To P, the disturbance location of outer bound pair optical cable can be obtained.
6. a kind of fault points of optical cables Precise Position System, which is characterized in that the fault points of optical cables accurate positioning method includes such as
Lower functional module:
Data acquisition module, for obtain disturbance in the case of be tested optical fibre in optical cable disturbance back scattering curve data, and
The undisturbed back scattering curve data of optical fibre in optical cable is tested in the case of not disturbing；
Module is filtered, for respectively to disturbance back scattering curve data and undisturbed back scattering curve data using small
Wave noise reduction algorithm is filtered；
Positioning analysis module, for respectively to the disturbance back scattering curve data and undisturbed back scattering song after filtering processing
Line number is denoised according to using wavelet decomposition, then carries out signature analysis to the data after wavelet decomposition denoising, is determined by signature analysis
Disturbance location.
7. fault points of optical cables Precise Position System according to claim 6, which is characterized in that the data acquisition module includes
Following functions unit:
Initial data acquisition unit, for obtaining the undisturbed of two groups of tested optical fibre in optical cable under the situation of no disturbance optical cable
Back scattering curve data obtains the disturbance back scattering curve number of one group of tested optical fibre in optical cable under the situation of disturbance optical cable
According to；
Noise data acquiring unit for making the difference to two groups of undisturbed back scattering curve datas A2, A1, and is normalized
To the array of data B1 of noise signal；
Noisy data acquiring unit, for disturbance back scattering curve data A3 and any one group of undisturbed back scattering curve
Data A1 or A2 make the difference, and are normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
8. fault points of optical cables Precise Position System according to claim 7, which is characterized in that
By disturbance back scattering curve data A3 and in the undisturbed back scattering of rear extraction in the noisy data acquiring unit
Curve data A2 makes the difference, and is normalized to obtain the disturbing signal array of data B2 for carrying noise signal.
9. fault points of optical cables Precise Position System according to claim 7, which is characterized in that the filtering processing module is specific
It handles to obtain array of data C1 and C2 for array of data B1 and B2 to be passed through wavelet de-noising respectively, then C1 is undisturbed small echo drop
Data after making an uproar, C2 are to have data after disturbance wavelet de-noising.
10. fault points of optical cables Precise Position System according to claim 9, which is characterized in that the positioning analysis module packet
Include following functions unit:
Noise characteristic amount extraction unit obtains 4 layers for array of data C1 to be done 4 layers of wavelet decomposition using haar wavelet basis respectively
Data after decomposition extract each layer noise characteristic amount t1, t2, t3 and t4 respectively from the data after 4 layers of wavelet decomposition；
Filtering and noise reduction unit, for by array of data C2 using haar wavelet basis do respectively 4 layers of wavelet decomposition obtain 4 layers decompose after
Data, by the data after each layer of wavelet decomposition using noise characteristic amount t1, t2, t3 and the t4 extracted in step S31 into
Row denoises respectively, array of data D1, D2, D3 and D4 after obtaining filtering and noise reduction；
Data convert unit, in every layer of wavelet decomposition data array D1, D2, D3 and D4 for being obtained after filtering and noise reduction, point
Position number where each layer of characteristic quantity in array of data is reverted to original by the characteristic quantity for not finding this layer of upper disturbance location
Position number where in beginning array of data C2, is always obtained four data P1, P2, P3 and P4；
Clean positioning unit, for filter out in data P1, P2, P3 and P4 with the apparent data of other data differences, by remainder
P is obtained according to average treatment is done, the disturbance location of outer bound pair optical cable can be obtained.
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