CN108123750A - One kind is beneficial to clutter detection fiber circumference prior-warning device, system - Google Patents
One kind is beneficial to clutter detection fiber circumference prior-warning device, system Download PDFInfo
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- CN108123750A CN108123750A CN201611084034.9A CN201611084034A CN108123750A CN 108123750 A CN108123750 A CN 108123750A CN 201611084034 A CN201611084034 A CN 201611084034A CN 108123750 A CN108123750 A CN 108123750A
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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
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
- G08B13/124—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence with the breaking or disturbance being optically detected, e.g. optical fibers in the perimeter fence
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Abstract
The invention discloses one kind to be beneficial to clutter detection fiber circumference prior-warning device, system.Wherein, this method includes：Forewarning Terminal obtains fiber-optic vibration signal；One clutter map unit is formed to the echo-signal of several resolution cells；Input signal of the spatial manipulation as current clutter unit is carried out based on L wave filters；The input signal of each clutter map unit is iterated；Clutter map is obtained the location place of putting noise intensity is calculated to detect target.By the above-mentioned means, present invention utilizes clutter environment time domain relative smoothness, spatial domain with time domain is combined, reaches detection early warning effect, effectively rejects interference, raising early warning is accurate, reaches circumference and invades accurate early warning.
Description
Technical field
The present invention relates to fiber optic communication fields, effectively vibrate determination methods, apparatus and system more particularly to a kind of optical fiber.
Background technology
As optical fiber processing technology develops, using fiber-optic probe surrounding enviroment situation, for example whether there is object to pass through, be
No is ambient noise signal interference etc..When detection fiber is influenced to vibrate be subject to external interference, the portion of transmission light in optical fiber
Intrinsic to change, terminal-pair signal is acquired, and judges that fiber-optic vibration signal generates Rayleigh scattering light echo, and then detectable
Go out to occur the corresponding signal wave of vibration position, and then authentic and valid invasion is effectively determined whether there is according to the signal wave.
However, the artificial difference vibration signal of existing fiber circumference method for early warning generally use and independent thresholding determination methods,
To judge whether the vibration signal belongs to invasion.Existing judgment mode efficiency is low, and accuracy rate is low, is easily subject to wind disturbance etc.
Interference.
The content of the invention
The invention mainly solves the technical problem of providing a kind of optical fiber effectively to vibrate determination methods, apparatus and system, energy
Enough realize accurately judges intrusion event, provides early warning, and effectively rejects interference signal.
In order to solve the above technical problems, one aspect of the present invention is：A kind of fiber-optic vibration detection side is provided
Method, including：Detection terminal obtains fiber-optic vibration signal；The fiber-optic vibration signal is judged using clutter detection algorithm,
Obtain the vibration early warning event of the fiber-optic vibration signal.
Wherein, described the step of carrying out early warning judgement to the fiber-optic vibration signal using clutter map detection technique algorithm, wraps
It includes：The intensity of the fiber-optic vibration signal is subjected to spatial processing and Time Domain Processing as a result, and by the vibration of several resolution cells
Signal is combined into a clutter map unit, continues to be based on the sample in clutter map unit the progress spatial processing conduct of L wave filters
The input signal of current clutter map unit；The input signal of clutter map unit is iterated result each time previous again, obtains
To clutter map inspection positions noise intensity be able to detection early warning.
Wherein.Described by the time domain is real world, is the domain of only physical presence.Because our experience be all
In time domain develop and verify, occur with having got used to the sequencing of event temporally.Usually analyzed in the time domain,
Because noise intensity is exactly finally to measure in the time domain.
Wherein, it is described to match spatial domain with corresponding fiber lengths for the intensity of fiber-optic vibration signal, and according to
Spatial domain with setting optical fiber corresponds to length combine, obtain actual circumference dispose position, to Time Domain Processing and spatial processing
Predominantly：With M dimensional vector x (n)=[x1(n),…,xM(n)r] representing that n-th collects clutter echo, M represents neighbouring and differentiates list
First form, M represent the clutter unit that resolution cell is formed.Element in x (n) is ranked up to obtain vector xr(n)。
Wherein, the vector x obtainedr(n)=[x1(n),…,xM(n)r], wherein xj(n) x is representedr(n) unite in order for j-th in
Metering, to vector xr(n) element in wins carry out linear combination based on L rates, obtains statistic z (n)=crxr(n), wherein c tables
Show the dimension weight vector of M.The processing mode that the operation of orderly and linear combination operation is L wave filters is carried out to vector.
Wherein, then by sequence z (n) input signal strengths it is h (n)=w (1-w)nIn the linear discrete system of u (n), output
The as estimation of noise intensity level, that is, say inputs of the processing costs z (n) collected every time as single order discrete system,
And h (n)=w (1-w)nU (n) is then the acquisition intensity response for changing system.
Wherein, described that signal stabilization background is carried out to the fiber-optic vibration signal, oscillation intensity obeys Gauss
Distribution, for scanning corresponding fiber-optic vibration by force to mutual indepedent with each time between each resolution cell.Corresponding detection, when not
There are H in detection unit0When, the output q of i-th of Range resolution unit in being scanned per n timesi(n) probability density is, it is H when detecting target there are unit1When, per n times in scanning i-th Range resolution unit it is defeated
Go out qi(n) probability density is,
Wherein, in the method：U represents the power level that thermal noise adds clutter;It is signal to the average noise entirely disturbed
Compare src;The H in there is no detection unit0When, it is H when detecting target there are unit1When.
In order to solve the above technical problems, the self-adaptive decision criterion that the present invention uses, it is strong that fiber sensor provides fiber-optic vibration
Degree (n+1)th time scanning in be to k-th of resolution cell detection probability
；
Wherein, E represents being averaged for statistics, and false-alarm probability can be by the echo independent statistics that scan every time, it is important to be to sort
The linear combination c of statisticr xr(n) variable conversion is handled.
In order to solve the above technical problems, another technical solution that the present invention uses is：Variable is converted, kind of a fiber-optic vibration detecting system is provided, including fibre optical sensor and Forewarning Terminal；The fibre optical sensor
For sending the first optical signal at one end, and the second light reflected by first optical signal is received from described one end and is believed
Number；The terminal for determine the corresponding electric signal of the second optical signal be fiber-optic vibration signal when, to the intensity vector z
(j) m-th of component in is defined, when it is one time to gather signal, i.e.,When, wherein, it is described
Terminal gathers above-mentioned fiber-optic vibration signal numberWhen,With right
The fiber-optic vibration signal carries out resolution cell vibration signal and carries out calculating false-alarm probability.
Above-mentioned single fiber vibration calculating is compared by threshold values again,For threshold values
The factor judges to vibrate early warning position, obtains circumference early warning invasion and judge.
Said program, Forewarning Terminal are detected light vibration signal using clutter detection, without manually participating in, realize
Optical fiber vibration intrusion judged automatically, moreover, unit is carried out specific division by detection algorithm filters out noise, effect is than artificial
It is faster more accurate that early warning judges, therefore improves early warning efficiency, accuracy and real-time.
Description of the drawings
Fig. 1 is the flow chart of one embodiment of fiber-optic vibration circumference early warning system of the present invention；
Fig. 2 is the structure diagram of one embodiment of fiber-optic vibration circumference early warning system of the present invention；
Fig. 3 is the flow chart of another embodiment of fiber-optic vibration circumference early warning system of the present invention；
Fig. 4 is fiber-optic vibration circumference early warning system structure diagram of the present invention；
Fig. 5 is the partial process view of optical fiber perimeter prior-warning device another embodiment of the present invention；
Fig. 6 is the structure diagram of one embodiment of optical fiber perimeter prior-warning device of the present invention.
Specific embodiment
In being described below, in order to illustrate rather than in order to limit, it is proposed that such as particular system structure, interface, technology it
The detail of class, to understand thoroughly the application.However, it will be clear to one skilled in the art that there is no these specifically
The application can also be realized in the other embodiment of details.In other situations, the detailed of device, circuit and method is omitted
Illustrate, in case unnecessary details interferes the description of the present application.
Referring to Fig. 1, optical fiber vibrational early warning of the present invention detects the flow chart of an embodiment, this method includes：
S11：Forewarning Terminal terminal obtains fiber-optic vibration signal and is converted to ripple.
Wherein, the fiber-optic vibration signal is fiber optic telecommunications number, which is converted by the optical signal of fiber reflection
It obtains.
Incorporated by reference to Fig. 2 for example, Fig. 2 shows a fiber-optic vibration circumference early warning system, which can
Using light pulse modulation system, reflecting interference Strength Changes caused by by detecting the phase place change of backscatter signals, energy
It is enough to detect multiple concurrent vibration sources simultaneously, it is positioned so as to fulfill early warning and to vibration source.The optical fiber vibration source early warning system includes order
Fibre optical sensor 21, optical system 23, photoelectric switching circuit 24 and the Forewarning Terminal 22 of connection.
Fibre optical sensor 21 is arranged in the environment that need to be monitored such as underground, to monitor the environmental aspect.Fibre optical sensor 21
In common communications optical cable idle fibre core can be used and make sensing unit, carry out Distributed Multi vibration measurement.It is substantially former
Reason is when extraneous effect of vibration is in communications optical cable, and fibre core in optical cable is caused to deform upon, and sends out core length and refractive index
Changing causes the phase of light in optical cable to change.When light transmits in optical cable, since photon and fibre core lattice are made
With constantly transmitting Rayleigh scattering light backward.When the external world has vibration to occur, the phase of back rayleigh scattering light becomes therewith
Change, these carry the flashlight of extraneous vibration information, are handled through optical system 23, and faint phase place change is converted to light intensity becomes
Change, then after opto-electronic conversion and the corresponding signal processing of photoelectric switching circuit 24, data analysis is carried out into people's terminal 22.Early warning is whole
End 22 as a result, judge the generation of vibration event, and confirms according to analysis and vibrates place.
Specifically, 21 timing of fibre optical sensor sends the first optical signal from one end, which can be a pulse
Signal, is such as the laser that pulse width is 10ns, and first optical signal each position in optical cable is formed by Rayleigh scattering
Second optical signal, and second optical signal is reflected back one end of the fibre optical sensor 21.Fibre optical sensor 21 is defeated from the one end
Go out second optical signal.Optical system 23 samples the second optical signal, obtains multiple Sampled optical signals.Wherein, the sampling
Interval can gather the optical signal that optical fiber emits every setpoint distance, for example, first Sampled optical signals is corresponded to apart from optical fiber one
The optical signal of the 1 meter of position reflection in end, second Sampled optical signals correspond to the optical signal apart from the 2 meters of position reflections in optical fiber one end,
And so on.
Due to the optical signal of backscattering and its faint, and its noise is smaller, difficult during to optical signal prosessing
Spend that larger, precision is smaller, therefore above-mentioned multiple Sampled optical signals clearance photoelectric switching circuits 23 are converted to corresponding adopt by system
Sample electric signal is convenient for the processing of signal.Here can analog signal be converted to by general such as the APD of photoelectric switching circuit 23,
Digital signal is converted analog signals by analog-digital converter again, and is sent to terminal 22.
In other embodiments, the opto-electronic conversion and analog-to-digital conversion step can be performed by detection terminal 22, i.e. detection is whole
End 22 receives the multiple Sampled optical signals obtained to the second light signal collection that fibre optical sensor 21 reflects, and converts thereof into more
A sampling electric signal, and the sampling electric signal is compared and analyzed with default vibration signal, if the sampling electric signal is with presetting
Vibration signal waveforms match, then the sampling electric signal directly are confirmed as fiber-optic vibration signal.Alternatively, detection terminal obtain with it is pre-
If after the matched sampling electric signal of vibration signal, the analysis first sampling electric signal is in the smooth performance in time domain and spatial domain；It is right
Answer it is described sampling electric signal different time domain and spatial domain smooth performance, using different detection modes to it is described sampling electric signal into
Row detection；If the detection passes through, the sampling electric signal is confirmed as into fiber-optic vibration signal.
Wherein, which gathers fiber-optic vibration signal in real time, which can be adjusted according to actual conditions,
In general, the acquisition interval is between 10 μ s-100 μ s, such as 40 μ s, 10 μ s, 100 μ s.Forewarning Terminal 22 can in real time shake to optical fiber
Dynamic signal is handled or timing carries out signal processing, for example, every 1024 vibration signals are divided into a frame by Forewarning Terminal 22
{ xl, x2...., x1024 }, fiber-optic vibration signal carry out data processing.
S12：Forewarning Terminal carries out pre-warning signal judgement using clutter map detection algorithm to the fiber-optic vibration signal, obtains
The circumference early warning of the fiber-optic vibration signal.
The heliogram of fiber-optic vibration obtains echo envelope signal qi (n) by square law detection, it is according in scanning
The method of estimation carries out the update of noise intensity estimation.It is assumed that terminal transmits M laser in scanning process, first to coming
No-coherence cumulating is carried out from M echo impulse echo-signal qi (n) of a certain Range resolution unit：, formula
In, qi (n) (i=1 ..., M) represent the echo letter from some i-th of pulse of Range resolution unit in n-th scanning process
Number；Q (n) represents the result of pulse accumulation.Then, q (n) is multiplied by a weighted factor and plus a preceding clutter background intensity
Estimate p (n-1) (1- α) times, obtain the new estimate p (n) of current clutter background intensity
In the present embodiment, background obeys Wei Buer distributions, and the echo-signal from each Range resolution unit is between the pulses
The statistical iteration between scanning, probability density function (PDF) f of clutter sample qi (n) (i=1 ..., M) after quadratic detection
(t) with cumulative distribution function (CDF) F (t) respectively.
The false-alarm probability Pfa that detector gives, detection threshold T are determined by formula (13), (14), it depends on clutter
Form parameter c and the binary integration criterion (K/M) of use.When c=2.0, c=1.4 and c=0.8 is set forth, based on non-phase
For the detection probability of the clutter map detection method of dry accumulation with the change curve of signal to noise ratio (SCR), weighted factor takes α=1/8 [8], empty
Alarm probability is set as Pfa=10-6.Note " 1/8 ", " 1/8 " ..., " 8/8 " correspond to different binary integration situations respectively.As
Compare, also give the detection performance curve of classical Nitzberg clutter maps, be labeled as " CM ".(Rayleigh is corresponded in c=2.0
Distribution) and Pd=0.8 when, it can be seen that optimal detection performance is by binary integration criterion (2/8) acquisition, binary integration (2/
8), (3/8), (4/8) detection performance are closer to, and worst detection performance is obtained by binary integration (8/8).But they
Improve a lot than classical Nitzberg clutter maps detection mode " CM ".In c=1.4, can be seen that most from Fig. 2 (b)
Good detection performance is obtained by accumulation criterion (4/8), and binary integration (3/8), (4/8), (5/8) detection performance are closer to.
In c=0.8, it can be seen that optimal detection performance is obtained by accumulation criterion (6/8), and worst detection performance is by binary integration
(1/8) obtain.As it can be seen that for using 8 accumulation pulses clutter maps detection for, difference accumulation criterion methods between difference compared with
Greatly, they all have greatly improved compared to the detection performance of classical clutter map, essence be context of methods employ two into
No-coherence cumulating mode processed so that the detection performance of clutter map obtains larger raising, disclosure satisfy that clutter map detection technique in reality
Performance requirement in the application of border.As can be seen that for the heavier feelings of the hangover of clutter form parameter c smaller namely clutters distribution
Condition, it should the clutter compared with " sharp " be inhibited using higher binary integration thresholding K (K/M), so as to obtain preferable radar mesh
Mark detection performance.It is worth noting that the form parameter for assuming clutter herein is known, maximum can be taken in practice seemingly
Right method of estimation is carried out in estimation the present embodiment, and Forewarning Terminal examines light vibration signal using clutter map detection technique of determining
It surveys, without manually participating in, realizes the detection of the early warning to optical fiber vibration source,
Referring to Fig. 3, Fig. 3 is the flow chart of one embodiment of method of optical fiber vibration source early warning of the present invention.In the present embodiment,：
It is that matched filter is to export the signal-to-noise ratio of signal maximum first, mathematical principle is exactly to utilize the power for exporting signal
Than upper noise power, output signal is wave filter response and the convolution of input signal, then draws one using inequality
The ratio between peak signal instantaneous power and noise average power, then the anti-wave filter that solves respond.
Matched filter impulse response, it is clear thatWithOnMutually it is mirrored into
Relation, here.In addition, to form causal system, input signal u (t) must beTerminated before moment, otherwise show
Right wave filter can not obtain fully entering energy, also be impossible to that signal-to-noise ratio is made to reach maximum, so t0Minimum value be signal
The time of end, because General System in signal it is not desirable that terminate to be detected again long after, general all numbers of winning the confidence
Finish time.As soon as wave filter has still obtained a peak value in input waveform finish time, this demonstrate waveform it is constant in the case of
The time availability of matched filter.
As above-mentioned, the fiber type in the present embodiment includes touching optical cable vibration source.One of effect of matched filter is pair
Stronger frequency content carries out larger weighting in input signal, small weighting is carried out to smaller ingredient, this is clearly to filter out
The most effective mode of the white noise of uniform power spectrum.And phase spectrum complementation ensure that the linear phase of output signal so that believing
Number finish time obtains peak value, and in brief, matched filtering can make the signal energy aggregation that nonlinear phase is composed, and for making an uproar
Sound is due to its intrinsic randomness, and on it any influence will not occur for the phase-frequency characteristic of matched filtering, so as to obtain maximum noise
The characteristic of ratio.
The vibration signal of the fiber-optic vibration signal is carried out matched filter by Forewarning Terminal, is then filtered, is screened out
Background noise.
The echo-signal of vibration signal result Ji Ge branches unit is formed into a clutter unit, at clutter unit
Reason, with M dimensional vectors, illustrate the vector that n-th obtains, wherein
xj(n) x is representedr(n) j-th of ordered statistics in, to vector xr(n) element in wins carry out linear combination based on L rates, obtains
To statistic, the dimension weight vector of wherein c expressions M.
Forewarning Terminal by the signal statistics amount collected be stored in c in, vibration signal peak value reflection be vibrational waveform most
Large amplitude because when this one kind occurs judder and early-warning point can occur strong vibration cause signal undergo mutation generate it is short
Significantly value signal in time
Vector is ranked up and two step of mode computing of linear combination operates, using quicksort mode, by former PROBLEM DECOMPOSITION
For several scale smallers but the structure subproblem similar to former problem.These subproblems are recursively solved, then a little ask this
The solution of topic is combined as the solution of former problem.The detailed process of quicksort is as follows：The first step is appointed in n record to be sorted and is taken
One record, is subject to the order code of the record, and all records are divided into two groups, and the 1st group of order code respectively recorded is both less than etc.
In the order code, the 2nd group of order code respectively recorded is both greater than the order code, and the record is come among this two groups.Second
Step, using same method, the group of group and the right to the left side is ranked up, and is until all records are all discharged to corresponding position
Only.
As described above, carrying out next step filtering to the fiber-optic vibration signal after sequence, the data obtained after wave filter are z
(n)=crx1(n), sequence z (n) is that obtained fiber-optic vibration intensity is that the jamming target signal in clutter map unit is picked
It removes, to treated, sequence carries out time domain iterative processing again.
From (n+1)th collection period, NiA early warning target enters in clutter map unit and continues L scan period,
The heliogram of each early warning target is again incoherent in the scan period, and with identical oscillation intensity.K-th of distance is single
Member is in the detection probability of (n+L+k) secondary acquisition：
Ordered statistics x1
(j) come from two estimator of parent distribution of jamming target and noise sample, a kind of situation of Jiang is into limit by row, it is assumed that jamming target it is strong
Degree is powerful enough, and the totality of jamming target accounts for N before ordered statisticsiA maximum sample position.To the intensity vector z (j)
In m-th of component be defined, when it is one time to gather signal, i.e. during m=1, wherein, the terminal is adopted
When collecting above-mentioned 2≤m of fiber-optic vibration signal number≤M,With to the optical fiber
Vibration signal carries out resolution cell vibration signal and is calculated
Wherein, then by sequence z (n) input signal strengths it isLinear discrete system in, output is
The estimation of noise intensity level, that is, say inputs of the processing costs z (n) collected every time as single order discrete system, andIt is then the acquisition intensity response for changing system.
As above-mentioned, interfering noise is deleted in the fiber-optic vibration early warning in the present embodiment.Forewarning Terminal can in advance correspond to optical fiber
The vibration signal that position generates is filtered, and energy signal sequential is established with the feature of the intensity of the vibration signal, and with sequential
Queue determines whether to vibrate.
From the foregoing, it will be observed that the sampled signal that processing terminal early warning goes out to invade signal can just judge its environmental aspect, therefore to letter
Number accurately sampling it is of crucial importance.Processing terminal of the present invention only slides long less than sampled signal when being sampled every time using sliding window mode
The time gap of degree so that sampled signal is more rich, and a bit of new data is only filled between adjacent sampled signal, is easily collected
It is handled comprising the signal of data needed for enough early warning namely easy each resolution cell early warning position, therefore beneficial to accurate pre-
It is alert, the accuracy rate of early warning judgement is improved, that is, improves the accuracy of the circumference early warning of optic fibre environment situation.
Refering to Fig. 5, the structure diagram of one embodiment of fiber-optic signal processing unit of the present invention, the device includes：
Acquisition module 51, for obtaining fiber-optic vibration signal.
Warning module 52 for being judged using fiber-optic signal clutter algorithm the fiber-optic vibration signal, is detected
Fiber-optic vibration circumference early warning.
Optionally, which is specifically used for the intensity of the fiber-optic vibration signal carrying out calculation process, and root
According to obtaining as a result, each resolution cell early warning position is handled.
Optionally, which includes the first judging unit, and for effectively being filtered to light echo intensity, signal is miscellaneous
Ripple can deviate from Gaussian Profile non-gaussian distribution is presented by statistical distribution, and non-gaussian is used again by the processing method of detector
In background part-size distribution.To its two parameter part-size distribution（Position and scale parameter）Estimation use optimality line
Property unbiased esti-mator.
Optionally, which includes second judgment unit, for being distributed in detection signal ordered statistics, uses M
The signal that collects of dimensional vector expression, carries out combination spatially and temporally, by Time Domain Processing can effective repeated detection,
The middle increased forms of n get each collection result, and the vector of composition acquisition in time combines in terms of spatial domain, using similary
M dimensional vector modes, with Ordered Statistic, form a clutter plane.
Optionally, which includes the 3rd judging unit, carries out L filter process to signal, is examined using frequency domain
Device is surveyed, quadratic detection is equal to the product on frequency domain using the convolution in time domain.So the signal collected and wave filter are led to
Algorithmic transformation is crossed to after frequency domain, directly they are multiplied, then switches back to time domain again（The namely spatial domain of signal）.
Optionally, which includes the 4th judging unit, for being obtained after the acquisition process of fiber-optic vibration signal
It arrives, the fiber-optic vibration signal is ranked up and linear combination operation, then by sequence z (n) input signals
It is converted,In linear discrete system, output y (n) handles signal level estimation for clutter,, clutter map probability is obtained in n times scanning result.
Specifically, h (n) is calculated for sequence of calculation z (n) input signal strengths in the 4th judging unit, is exactly two
Variable is proportional, discrete i.e. discontinuous, and the number for the specialty said, continuous signal is simulation.Linear Time Invariant
Divide whether being changed with time with linear time varying system according to system,。
Optionally, the sort module 52 include the 5th judging unit, by threshold factor T, determine false-alarm probability, power to
AmountFor, wherein, r is by vector xr(n) the deletion number of samples from high-end.By adaptively sentencing
Disconnected criterion is：
Specifically, the 5th judging unit is specifically used for the energy stability degree for obtaining the fiber-optic vibration signal；It is if described
Energy stability degree is more than the first degree, then is early warning by the judgement of the fiber-optic vibration signal.
Optionally, described device further includes notification module, for judging the corresponding vibration source type of the fiber-optic vibration signal
Affiliated notification level；Corresponding notice is carried out according to the notification level.
Wherein, the above-mentioned module of the Forewarning Terminal is respectively used to perform the corresponding steps in above method embodiment, specifically
As above embodiment of the method illustrates that therefore not to repeat here to implementation procedure.
Refering to Fig. 6, the structure diagram of another embodiment of optical fiber vibration intrusion prior-warning device of the present invention, the device 60 wraps
Include processor 61, memory 62, receiver 63 and bus 64.Wherein, processor 61, memory 62, receiver 63 may each be
One or more, in Fig. 6 only exemplified by one.
Receiver 63 is used to receive the information of external equipment transmission.For example, reception optical fiber signal, as fibre optical sensor is sent
Optical signal, the electric signal after opto-electronic conversion or through be determined as fiber-optic vibration generation signal fiber-optic vibration signal.
Memory 62 provides the computer program for storing computer program to processor 61, and can store place
Manage the data that device 61 is handled, such as the fiber-optic signal lamp that receiver 63 receives.Wherein, memory 62 can include read-only storage
Device, random access memory and nonvolatile RAM（NVRAM）At least one of.
Memory 62 store computer program include following element, executable modules or data structures or it
Subset or their superset:
Operational order：Including various operational orders, various operations are used to implement.
Operating system：Including various system programs, various basic businesses and the hardware based task of processing are used to implement.
In embodiments of the present invention, processor 61 is by calling the operational order that memory 62 stores（The operational order can
Storage is in an operating system）, to perform operation below.
Specifically, processor 61 can perform the computer program in memory 62, be used for：
Forewarning Terminal obtains fiber-optic vibration signal；
Early warning is carried out to the fiber-optic vibration signal using Clutter-map Technology, obtains the circumference invasion thing of the fiber-optic vibration signal
Part.
Optionally, processor 61 performs the use clutter principle algorithm and carries out classification bag to the fiber-optic vibration signal
It includes：The time domain of the fiber-optic vibration signal is wanted to combine with spatial processing, and resoluting signal processing unit, by L wave filters into
Row filtering process operates, and continues ordered vector computing, obtains resolution distance cell format, forms a clutter unit.
Optionally, processor 61 performs the clutter by the fiber-optic vibration signal and is filtered, and to result
The processing for carrying out time domain and spatial domain is combined, and continues be combined into the echo-signal of resolution cell clutter map unit, right
Clutter map unit echo samples carry out spatial processing based on L wave filters and are inputted as the signal of current clutter map, then to each miscellaneous
The input signal of ripple figure unit is iterated result each time previous, and step includes：The letter collected is represented with M dimensional vectors
Number, carry out combination spatially and temporally, by Time Domain Processing can effective repeated detection, the increased forms of wherein n get
Each collection result, the vector of composition acquisition in time, combines in terms of spatial domain, using same M dimensional vectors mode, with orderly
Statistics forms a clutter plane.
Optionally, processor 61 is additionally operable to：L filter process is carried out to signal, using frequency domain detection device, quadratic detection
Product on frequency domain is equal to using the convolution in time domain.So the signal collected and wave filter are passed through into algorithmic transformation to frequency domain
Afterwards, directly they are multiplied, then switch back to time domain again（The namely spatial domain of signal）.
Optionally, processor 61 is additionally operable to：If the energy information entropy feature does not meet the preset energy comentropy mould
Type, then whether the duration for judging the fiber-optic vibration signal is more than setting time；If being more than, the fiber-optic vibration is believed
Number carry out fundamental frequency cycles model matching；Otherwise, the matching of signal stabilization model is carried out to the fiber-optic vibration signal.
Optionally, processor 61 performs described for being obtained after the acquisition process of fiber-optic vibration signal,
The fiber-optic vibration signal is ranked up and linear combination operation, then sequence z (n) input signals is converted,In linear discrete system, output y (n) handles signal level estimation for clutter,,
Clutter map probability is obtained in n times scanning result.
Optionally, processor 61 performs sequence of calculation z (n) input signal strength and h (n) is calculated, and is exactly two
Variable is proportional, discrete i.e. discontinuous, and the number for the specialty said, continuous signal is simulation.Linear Time Invariant
Divide whether being changed with time with linear time varying system according to system,。
Optionally, processor 61 is additionally operable to：By threshold factor T, false-alarm probability is determined, be in weight vector c, wherein, r is by vector xr(n) the deletion number of samples from high-end.Pass through adaptive judgement criterion
For：
Specifically, the 5th judging unit is specifically used for the energy stability degree for obtaining the fiber-optic vibration signal；It is if described
Energy stability degree is more than the first degree, then is early warning by the judgement of the fiber-optic vibration signal.
Above-mentioned processor 61 can also be known as CPU（Central Processing Unit, central processing unit）.Specifically
Application in, the various components of terminal are coupled by bus 64, and wherein bus 64 may be used also in addition to including data/address bus
To include power bus, controlling bus and status signal bus in addition etc..But for the sake of clear explanation, by various buses in figure
All it is designated as bus 64.
The method that the invention described above embodiment discloses can also be applied in processor 61 or real by processor 61
It is existing.Processor 61 may be a kind of IC chip, have the processing capacity of signal.During realization, the above method
Each step can be completed by the integrated logic circuit of the hardware in processor 61 or the instruction of software form.Above-mentioned processing
Device 61 can be general processor, digital signal processor（DSP）, application-specific integrated circuit（ASIC）, ready-made programmable gate array
（FPGA）Either other programmable logic device, discrete gate or transistor logic, discrete hardware components.Can realize or
Person performs disclosed each method, step and the logic diagram in the embodiment of the present invention.General processor can be microprocessor or
Person's processor can also be any conventional processor etc..The step of method with reference to disclosed in the embodiment of the present invention, can be straight
It connects and is presented as that hardware decoding processor performs completion or performed with the hardware in decoding processor and software module combination
Into.Software module can be located at random access memory, and flash memory, read-only memory, programmable read only memory or electrically-erasable can
In the storage medium of this fields such as programmable memory, register maturation.The storage medium is located at memory 62, and processor 61 is read
Information in respective memory, with reference to the step of its hardware completion above method.
In said program, Forewarning Terminal carries out early warning using signal noise diagram technology to light vibration signal, without artificial
It participates in, realizes and fiber-optic vibration early warning is judged, moreover, can be to the place of time domain and spatial domain using segmentation clutter early warning Processing Algorithm
It manages a nodes multiple or even up to ten thousand and carries out early warning judgement, effect is faster more accurate than artificial early warning, therefore improves early warning efficiency
And accuracy.Further, since clutter processing structure is simply clear and is easily achieved, prealarming process can be simplified.
In several embodiments provided by the present invention, it should be understood that disclosed method and device, Ke Yitong
Other modes are crossed to realize.For example, device embodiments described above are only schematical, for example, the module or
The division of unit is only a kind of division of logic function, can there is other dividing mode, such as multiple units in actual implementation
Or component may be combined or can be integrated into another system or some features can be ignored or does not perform.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can be located at a place or can also be distributed to multiple
In network element.Some or all of unit therein can be selected to realize present embodiment scheme according to the actual needs
Purpose.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also may be used
To be that unit is individually physically present, can also two or more units integrate in a unit.It is above-mentioned integrated
The form that hardware had both may be employed in unit is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit in above-mentioned other embodiment is realized in the form of SFU software functional unit and as independently
Production marketing or in use, can be stored in a computer read/write memory medium.Based on such understanding, the present invention
The part that substantially contributes in other words to the prior art of technical solution or all or part of the technical solution can be with
It is embodied in the form of software product, which is stored in a storage medium, is used including some instructions
A so that computer equipment（Can be personal computer, server or the network equipment etc.）Or processor
（processor）Perform all or part of step of each embodiment the method for the present invention.And foregoing storage medium bag
It includes：USB flash disk, mobile hard disk, read-only memory（ROM, Read-Only Memory）, random access memory（RAM, Random
Access Memory）, the various media that can store program code such as magnetic disc or CD.
The foregoing is merely embodiments of the present invention, are not intended to limit the scope of the invention, every to utilize this
It is relevant to be directly or indirectly used in other for the equivalent structure or equivalent flow shift that description of the invention and accompanying drawing content are made
Technical field is included within the scope of the present invention.
Claims (10)
- A kind of 1. method judged using the early warning of clutter detection fiber circumference, which is characterized in that including：Forewarning Terminal obtains optical fiber Vibration signal；The fiber-optic vibration signal is detected using clutter testing principle combination spatial processing and using processing, is obtained Early warning is carried out to corresponding position to the vibration source position of the fiber-optic vibration signal and intensity.
- 2. according to the method described in claim 1, it is characterized in that, described use time domain and spatial domain with reference to the fiber-optic vibration Signal carries out successive ignition, and obtaining the step of clutter calculates inspection positions noise intensity includes：With M dimensional vector x (n) =[X1(n),…,XM(n)]TRepresent that n-th collects clutter echo, M represents neighbouring resolution cell form, and M represents resolution cell The clutter unit formed, is ranked up the element in x (n) to obtain vectorial Xrn。
- 3. according to the method described in claim 2, it is characterized in that, the intensity by the fiber-optic vibration signal carries out effectively Statistic, and linear combination is carried out based on L filtering, continue to carry out vector effectively sequence and the operation of two step of linear combination operation i.e. The processing mode of L filtering：Judge the fiber-optic vibration echo by force to vectorial ordinal value and the restricted driving that is filtered combine system The processing mode of meter, then by sequence z (n) input signal strengths be h (n)=w (1-W)nIn the linear discrete system of u (n), output The as estimation of noise intensity level, that is, say inputs of the processing costs z (n) collected every time as single order discrete system, And h (n)=w (1-W)nU (n) is then the acquisition intensity response for changing system.
- 4. according to the method described in claim 3, it is characterized in that, described repeatedly swept the fiber-optic vibration signal strength Retouch processing costs, and according to as a result, continue the input of discrete system, that is, say that the elementary echo intensity of clutter map is based on L Wave filter carries out spatial processing and is further included as the input signal step of current optical fiber acquisition intensity clutter map unit：Adaptive inspection Early warning intensity threshold is surveyed to judge,, T is threshold factor, according to the early warning of setting spirit Sensitivity determines, notices that M=1 item clutter detection early warning only can judge according to current background intensity, each clutter map unit is believed Number intensity is iterated, if meeting condition of appeal, is warning information by the judgement of the fiber-optic vibration signal, is fed back to optical fiber Alarm system is determined as there is intrusion event.
- 5. according to the method described in claim 4, it is characterized in that, described detect the fiber-optic vibration signal strength in clutter After reach setting threshold values, and according to the noise intensity reached as a result, the probability and actual environment of alarm need sensitivity technique to have Effect intrusion.
- 6. according to the method described in claim 5, it is characterized in that, spatial domain is carried out using L wave filters to M neighbouring resolution cells Processing, then time domain iterative processing is carried out to acquired results, carrying out spatial processing using L wave filters first has to M resolution cell It is ranked up, then ordered samples is carried out with each component c that linear weighted combination determines weight vector cmOptimal weighting value：If The energy information entropy does not meet the preset energy comentropy, then judges whether the duration of the fiber-optic vibration signal surpasses Cross setting time；If being more than, the fiber-optic vibration signal is carried out to check line performance curve；Otherwise, to the optical fiber Vibration signal carries out signal and is weighted vector intensity.
- 7. according to the method described in claim 6, it is characterized in that, described carry out adjacent unit point to the fiber-optic vibration signal The step of different resolution is checked includes：Judge whether the fiber-optic vibration signal has fundamental frequency and whether fundamental frequency cycles reach To setting stationary value；If so, the detector that reaches of the fiber-optic vibration signal is checked that weighted signal strength is then determined as by force Vibration；Otherwise, the list of the unit distance of the fiber-optic vibration signal is vibrated, is not up to pre-warning signal value.
- 8. it signal is carried out to the fiber-optic vibration signal determines point the method according to the description of claim 7 is characterized in that described Resolution number of unit M=1,2,4,6,16, the probability that the detector of attenuation coefficient w=0.2 detects increases with signal-to-noise ratio into S-shaped, adjacent Nearly resolution cell form M is more, and detector performance, step includes：Obtain the energy stability of the fiber-optic vibration signal Degree；It screens out that adjacent unit number of samples r is more, and the loss of detector is bigger if described, when there is no time domain iterative processing, sieves Remove that adjacent unit sample is eventful, detector loss is than using big more of time domain iterative processing Detection engine, using mixing Detector can carry out more screen out to closing on reference unit sample；If the energy is by the clawback signal of multiple resolution cells One clutter unit of composition is carrying out time domain iterative processing after the echo samples in clutter unit are based on L filter process, In this manner it is possible to the noise jamming echo signal of entrance is weeded out by the function of L wave filters, in this manner it is possible to effectively keep away Exempt from noise jamming, increase the accuracy of early warning.
- 9. according to claim 1 to 8 any one of them method, which is characterized in that the method further includes：Determine the optical fiber Notification level belonging to the corresponding vibration source intensity of vibration signal；Corresponding notice is carried out according to the notification level, a kind of optical fiber shakes Source prior-warning device, which is characterized in that including：Acquisition module, for obtaining fiber-optic vibration signal；Early-warning judgment module, for adopting The fiber-optic vibration signal is detected with clutter detection technique, obtains the vibration pre-warning signal of the fiber-optic vibration signal.
- 10. a kind of optical fiber vibration source early warning system, which is characterized in that judge terminal including fibre optical sensor and early warning；The optical fiber Sensor receives second reflected by first optical signal from described one end for sending the first optical signal at one end Optical signal；The Forewarning Terminal for determine the corresponding electric signal of the second optical signal be fiber-optic vibration signal when, to the optical fiber Vibration signal carries out effective early warning, wherein, the Forewarning Terminal includes the optical fiber vibration source detection device described in claim 9, will Fiber arrangement causes optical-fibre needle pair in circumference when crossing enclosure wall etc., with to the fiber-optic vibration signal using clutter detect into Row circumference attack early warning.
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