CN108828403A - Wireline test signal noise silencing method, device and terminal - Google Patents
Wireline test signal noise silencing method, device and terminal Download PDFInfo
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- CN108828403A CN108828403A CN201810391850.7A CN201810391850A CN108828403A CN 108828403 A CN108828403 A CN 108828403A CN 201810391850 A CN201810391850 A CN 201810391850A CN 108828403 A CN108828403 A CN 108828403A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The present invention provides a kind of wireline test signal noise silencing method, device and terminals, it is related to the technical field of power cable test signal analysis, this method includes carrying out detecting resulting detection data to cable based on sound Magnetic Sensor linear sensing array, obtains wireline test signal；Using maximin criterion method and fixation, the section of thresholding variables corresponding with wireline test signal is determined；Using the optimal threshold in optimal threshold calculating method determination section；Denoising is carried out to wireline test signal according to optimal threshold, obtains noise cancellation signal.The present invention can efficiently reduce interference of the noise to wireline test signal.
Description
Technical field
The present invention relates to power cables to test signal analysis technology field, more particularly, to a kind of wireline test signal noise silencing
Method, apparatus and terminal.
Background technique
In recent years, with the implementation that Metropolitan Area Network (MAN) is transformed, power cable is more and more widely used.Power cable is embedded in
Underground is difficult directly to find its position of failure point once breaking down.Therefore it first to be carried out when power cable fault point is searched
Cable fault localization, i.e. general range where lookup fault point.General cable fault localization is to be visited by analysis to cable
The wireline test signal measured, to determine the general range where fault point.This requires wireline test signals centainly not
It can be by more noise jammings.The quality of wireline test signal is to determine the key factor of cable fault localization accuracy.Its
In, the quality of wireline test signal depends primarily on noise size entrained by wireline test signal, and wireline test signal is taken
The noise of band is smaller, and the quality of wireline test signal is better.
In order to obtain the wireline test signal of better quality, commonly used fixation or maximin criterion in the prior art
The threshold value that method is calculated carries out de-noising to wireline test signal, but the wireline test signal after obtained de-noising still retains
There is more noise, de-noising effect is poor, it is difficult to obtain the wireline test signal of better quality.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of wireline test signal noise silencing method, device and terminal, it can
The noise in wireline test signal is effectively reduced, de-noising effect is promoted, convenient for obtaining the wireline test signal of high quality.
In a first aspect, the embodiment of the invention provides a kind of wireline test signal noise silencing method, this method includes：Based on sound
Magnetic Sensor linear sensing array carries out cable to detect resulting detection data, obtains wireline test signal；Wherein, sound magnetic passes
Sensor linear sensing array includes multiple groups sound magnetic signal sensor；Using maximin criterion method and fixation, determining and cable
Test the section of the corresponding thresholding variables of signal；Using the optimal threshold in optimal threshold calculating method determination section；According to optimal
Threshold value carries out denoising to wireline test signal, obtains noise cancellation signal.
With reference to first aspect, the embodiment of the invention provides the first possible embodiments of first aspect, wherein on
The step of stating the section that thresholding variables corresponding with wireline test signal are determined using maximin criterion method and fixation, packet
It includes：The corresponding first threshold of wireline test signal is calculated using fixation；Electricity is calculated using maximin criterion method
The corresponding second threshold of cable test signal；According to first threshold and second threshold, determine that the corresponding threshold value of wireline test signal becomes
The section of amount.
The possible embodiment of with reference to first aspect the first, second the embodiment of the invention provides first party can
Can embodiment, wherein the step of the above-mentioned optimal threshold using in optimal threshold calculating method determination section, including：It obtains
The corresponding signal noise ratio of thresholding variables and root-mean-square error function；Based on the corresponding signal noise ratio of thresholding variables, in section
Interior building signal-to-noise ratio curve；Based on the corresponding root-mean-square error function of thresholding variables, root-mean-square error curve is constructed in section；
Based on the optimal threshold in signal-to-noise ratio curve and root-mean-square error curve determination section.
The possible embodiment of second with reference to first aspect, the third the embodiment of the invention provides first party can
The embodiment of energy, wherein the above-mentioned step based on the optimal threshold in signal-to-noise ratio curve and root-mean-square error curve determination section
Suddenly, including：Signal-to-noise ratio curve and root-mean-square error curve are normalized, signal-to-noise ratio proportional curve and root mean square are obtained
Error rate curve；Position the intersection point of signal-to-noise ratio proportional curve and root-mean-square error proportional curve；According in intersection point determination section
Optimal threshold.
With reference to first aspect, the embodiment of the invention provides the 4th kind of possible embodiment of first aspect, this method
Further include：Fault localization is carried out to cable based on noise cancellation signal, obtains test result；Generation includes the cable inspection of test result
Observe and predict announcement.
Second aspect, the embodiment of the invention provides a kind of wireline test signal noise silencing device, which includes：Signal obtains
Module is obtained, for detecting based on sound Magnetic Sensor linear sensing array to cable, obtains wireline test signal；Wherein, sound
Magnetic Sensor linear sensing array includes multiple groups sound magnetic signal sensor；Section determining module, for using maximin criterion
Method and fixation determine the section of thresholding variables corresponding with wireline test signal；Optimal threshold determining module, for using most
Optimal threshold in excellent threshold calculations method determination section；Signal noise silencing module is used for according to optimal threshold to wireline test signal
Denoising is carried out, noise cancellation signal is obtained.
In conjunction with second aspect, the embodiment of the invention provides the first possible embodiments of second aspect, wherein on
Section determining module is stated to be used for：The corresponding first threshold of wireline test signal is calculated using fixation；Using minimax
The corresponding second threshold of wireline test signal is calculated in Criterion Method；According to first threshold and second threshold, wireline test is determined
The section of the corresponding thresholding variables of signal.
In conjunction with second aspect, the embodiment of the invention provides second of possible embodiment of second aspect, the devices
Further include：Fault localization module obtains test result for carrying out fault localization to cable based on noise cancellation signal；Report generation
Module, for generate include test result cable detection report.
The third aspect, the embodiment of the invention provides a kind of terminal, which includes memory and processor, memory
Processor is supported to execute first aspect to side described in any one of the 4th kind of possible embodiment of first aspect for storing
The program of method, processor are configurable for executing the program stored in memory.
Fourth aspect, the embodiment of the invention provides a kind of computer readable storage medium, computer readable storage mediums
On be stored with computer program, the 4th kind of first aspect to first aspect is executed when which is run by processor can
The step of method described in any one of embodiment of energy.
The embodiment of the invention provides a kind of wireline test signal noise silencing method, device and terminals, are passed first by sound magnetic
Sensor linear sensing array can tentatively obtain the less wireline test signal of noise, then by maximin criterion method and admittedly
Determine the comprehensive determining thresholding variables section corresponding with the wireline test signal of method, and then determine the optimal threshold in the section, finally
According to determining optimal threshold to the progress de-noising of wireline test signal, this mode and in the prior art only with minimax standard
Then the mode of method or fixation carries out de-noising to wireline test signal, and the bad problem of de-noising effect is compared, can preferably disappear
Except the noise in wireline test signal, reach preferably de-noising effect, convenient for obtaining the wireline test signal of high quality.
Other feature and advantage of the embodiment of the present invention will illustrate in the following description, also, partly from explanation
It is become apparent in book, or understand through the implementation of the invention.The objectives and other advantages of the invention are in specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of flow chart of wireline test signal noise silencing method provided in an embodiment of the present invention；
Fig. 2 is the flow chart of another wireline test signal noise silencing method provided in an embodiment of the present invention；
Fig. 3 is a kind of structural block diagram of wireline test signal noise silencing device provided in an embodiment of the present invention；
Fig. 4 is the structural block diagram of another wireline test signal noise silencing device provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of terminal provided by the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Currently, carrying out de-noising to wireline test signal using Soft thresholding, it is related to the selection of threshold value, it is commonly used very big
Minimal Criterion method or fixation carry out selected threshold.And it is too small using the threshold value that maximin criterion method is calculated；Using fixation
The threshold value that method is calculated is excessive.The effect of both noise-eliminating methods is undesirable, causes the result of cable fault localization inaccurate
Really.Based on this, a kind of wireline test signal noise silencing method, device and terminal provided in an embodiment of the present invention can effectively subtract
Few interference of the noise to wireline test signal, to improve the accuracy of cable fault localization.
In a kind of optional mode, a kind of flow chart of wireline test signal noise silencing method shown in Figure 1, the party
Method includes the following steps：
Step S102 carries out cable based on sound Magnetic Sensor linear sensing array to detect resulting detection data, obtain
Wireline test signal；Wherein, sound Magnetic Sensor linear sensing array includes multiple groups sound magnetic signal sensor, and every group of sound magnetic signal passes
Sensor includes 1 magnetic signal sensor and 1 sound signal sensing device.The sampling wave band of the sound magnetic signal sensor of difference group is not
Together, that is, carrying out block sampling using multiple groups sound magnetic signal sensor.Wherein, magnetic signal sensor is detectable collects cable
Magnetic signal in local environment, the detectable voice signal collected in cable local environment of sound signal sensing device are believed from magnetic
Number and voice signal sampling can be used as wireline test signal.In the related technology, usually only with 1 magnetic signal sensor and 1
A sound signal sensing device needs the very high magnetic signal of frequency acquisition and voice signal to be sampled cable detection, however this
The wireline test signal that sample obtains inevitably produces the interference signal of much noise since frequency is very high, these interference
The possible covering cable of signal tests signal, influences the correlation analysis work of subsequent cable fault localization.In contrast, the present invention is real
It includes multiple magnetic signal sensors and multiple sound signal sensing devices, each magnetic that example, which is applied, using sound Magnetic Sensor linear sensing array
Signal transducer all corresponds to a sampling interval, and each sound signal sensing device also corresponds to a sampling interval, multiple magnetic letters
Number sensor and multiple sound signal sensing devices can synchronous acquisition magnetic signal and voice signal carry out subrane sampling because adopting
The mode of block sampling is carried out with multiple groups sound magnetic signal sensor, so very high frequency is not necessarily to, to reduce because of high-frequency
The noise jamming of generation.Therefore, the wireline test signal that the present embodiment is obtained by using sound Magnetic Sensor linear sensing array
Compared with directly sampling wireline test signal in the related technology, the present embodiment samples resulting wireline test signal itself institute first
The noise of carrying is less, facilitates further de-noising.When practical application, a kind of sound Magnetic Sensor line provided in an embodiment of the present invention
Property sensor array include 4 groups of signal transducers, synchronize and cable detected to obtain 4 sections of magnetic signals and 4 sections of voice signals, can use
Its average value is as wireline test signal.
Step S104 determines thresholding variables corresponding with wireline test signal using maximin criterion method and fixation
Section；
In view of the threshold value for using maximin criterion method to obtain at present is too small；The threshold value obtained using fixation is excessive.
The threshold value obtained using two methods carries out de-noising without good effect to wireline test signal.It can be seen that in both de-noisings
There should be an optimal threshold between the threshold value of method, ideal de-noising effect can be obtained, therefore minimax can be based on
Criterion Method and fixation determine the variable range of optimal threshold, i.e., the section of above-mentioned thresholding variables first.Specifically, pole can be used
The corresponding first threshold of wireline test signal is calculated in maximin criterion method；Wireline test signal is calculated using fixation
Corresponding second threshold；According to first threshold and second threshold, that is, it can determine the area of the corresponding thresholding variables of wireline test signal
Between.
When practical application, it is assumed that the corresponding thresholding variables of wireline test signal are T, according to the calculating of maximin criterion method
FormulaN>32 obtain first threshold T1；Wherein, N is that the wavelet systems of levels of detail to be analyzed are several
Number.According to the calculation formula of fixationObtain second threshold T2；Wherein, N is the small echo of levels of detail to be analyzed
Coefficient number, σ are the estimation of noise criteria difference.The constant interval for thereby determining that T is [T1,T2]。
Step S106, using the optimal threshold in optimal threshold calculating method determination section；
Specifically, the parameter for being able to reflect de-noising effect can be introduced, signal-to-noise ratio and root-mean-square error etc. are designed optimal
Threshold value calculation method is to obtain section [T1,T2] in optimal threshold.
Step S108 carries out denoising to wireline test signal according to optimal threshold, obtains noise cancellation signal.
The embodiment of the invention provides a kind of wireline test signal noise silencing method, device and terminals, are passed first by sound magnetic
Sensor linear sensing array can tentatively obtain the less wireline test signal of noise, then by maximin criterion method and admittedly
Determine the comprehensive determining thresholding variables section corresponding with the wireline test signal of method, and then determine the optimal threshold in the section, finally
According to determining optimal threshold to the progress de-noising of wireline test signal, this mode and in the prior art only with minimax standard
Then the mode of method or fixation carries out de-noising to wireline test signal, and the bad problem of de-noising effect is compared, can preferably disappear
Except the noise in wireline test signal, reach preferably de-noising effect, convenient for obtaining the wireline test signal of high quality.
To be convenient to carry out, the embodiment of the invention provides a kind of specific embodiments of step S106 in Fig. 1.It is i.e. above-mentioned to adopt
The step of with optimal threshold in optimal threshold calculating method determination section, including：
Step (1) obtains the corresponding signal noise ratio of thresholding variables and root-mean-square error function；
Specifically, the conceptualization formula of signal-to-noise ratio is：With
The conceptualization formula of root-mean-square error is：Wherein, f (n) is in above-mentioned expression formula
Wireline test signal,For noise cancellation signal, n is signal length.It, can according to the conceptualization formula of signal-to-noise ratio and root-mean-square error
Obtain the corresponding signal noise ratio snr (T) of thresholding variables T and root-mean-square error function rmse (T).
Step (2) is based on the corresponding signal noise ratio of thresholding variables, and signal-to-noise ratio curve is constructed in section；
Specifically, with signal noise ratio snr (T) for y-axis, rectangular coordinate system is established, in section using thresholding variables T as x-axis
[T1,T2] in building reflection snr (T) with T change and change relation curve.The curve is almost in monotone variation trend, i.e., with
T becomes larger, and snr (T) gradually becomes smaller.
Step (3) is based on the corresponding root-mean-square error function of thresholding variables, and root-mean-square error curve is constructed in section；
Specifically, with root-mean-square error function rmse (T) for y-axis, rectangular coordinate system is established using thresholding variables T as x-axis,
In section [T1,T2] in building reflection rmse (T) with T change and change relation curve.The curve is almost in that monotone variation becomes
Gesture, i.e., as T becomes larger, rmse (T) is become larger.
Step (4), based on the optimal threshold in signal-to-noise ratio curve and root-mean-square error curve determination section.
From the foregoing, it will be observed that the variation tendency of signal-to-noise ratio curve snr (T) and root-mean-square error curve rmse (T) are opposite.And it is general
Think, signal-to-noise ratio is bigger, and root-mean-square error is smaller, then de-noising effect is better.Therefore it can be bent to signal-to-noise ratio curve and root-mean-square error
Line is normalized, and obtains signal-to-noise ratio proportional curve and root-mean-square error proportional curve；Position signal-to-noise ratio proportional curve and
The intersection point of root-mean-square error proportional curve；According to the optimal threshold in intersection point determination section.
For ease of understanding, here, the present invention provides a kind of specific normalized modes：T pairs of known threshold variable
Signal noise ratio, the root-mean-square error function answered are respectively snr (T) and rmse (T), according to the variation of snr (T) and rmse (T)
Trend it is found that T in section [T1,T2] in corresponding signal-to-noise ratio minimum value be snr (T2), T is in section [T1,T2] in it is corresponding square
Root error minimum value is rmse (T1).Calculate separately section [T1,T2] boundary value, i.e. T1And T2The difference and T of corresponding signal-to-noise ratio1With
T2Root-mean-square error difference, signal-to-noise ratio proportion function p is described in the form of accountingsnr(T) and root-mean-square error proportion function
prmse(T), expression formula is as follows：
Signal-to-noise ratio proportional curve is constructed in section according to above-mentioned signal-to-noise ratio proportion function and root-mean-square error proportion function
And root-mean-square error proportional curve, this two plots changes are opposite and meet at a bit, which can make its corresponding psnr
(T) and prmse(T) difference DELTA p (T) between=| psnr(T)-prmse(T) | reach minimum, shows optimal property.That is noise
It is exactly optimal threshold than threshold value corresponding to proportional curve and root-mean-square error proportional curve intersection point.
Further, on the basis of Fig. 1, the flow chart of another wireline test signal noise silencing method shown in Figure 2,
In addition to step S102~step S108, further it is shown that following steps：
Step S202 carries out fault localization to cable based on noise cancellation signal, obtains test result；
Step S204, generation include the cable detection report of test result.
Through the above steps, cable fault survey is carried out using the wireline test signal (that is, noise cancellation signal) for eliminating noise
Away from accurate distance measurement result can be obtained；Generation includes the cable detection report of test result, facilitates related personnel
Test result is easily checked by examining report.
Corresponding to above method embodiment, a kind of structural block diagram of wireline test signal noise silencing device shown in Figure 3；
The device includes following module：
Signal obtains module 302, for detecting based on sound Magnetic Sensor linear sensing array to cable, obtains cable
Test signal；Wherein, sound Magnetic Sensor linear sensing array includes multiple groups sound magnetic signal sensor；
Section determining module 304, for using maximin criterion method and fixation, determination is corresponding with wireline test signal
Thresholding variables section；
Optimal threshold determining module 306, for using the optimal threshold in optimal threshold calculating method determination section；
Signal noise silencing module 308 obtains de-noising letter for carrying out denoising to wireline test signal according to optimal threshold
Number.
In the specific implementation, section determining module 304 is used for：Wireline test letter is calculated using maximin criterion method
Number corresponding first threshold；The corresponding second threshold of wireline test signal is calculated using fixation；According to first threshold and
Second threshold determines the section of the corresponding thresholding variables of wireline test signal.
Further, the structural schematic diagram of another wireline test signal noise silencing device shown in Figure 4；The device is being schemed
On the basis of 3, fault localization module 402 and report generation module 404 are also illustrated.Wherein, fault localization module 402 is used for
Fault localization is carried out to cable based on noise cancellation signal, obtains test result；Report generation module 404 includes to survey for generating
The cable detection of test result is reported.
The technical effect of device provided by the present embodiment, realization principle and generation is identical with previous embodiment, for letter
It describes, Installation practice part does not refer to place, can refer to corresponding contents in preceding method embodiment.
Further, a kind of terminal is present embodiments provided, which includes memory and processor, and memory is for depositing
Storage supports processor to execute the program of any of the above-described wireline test signal noise silencing method, and processor is configurable for executing and deposit
The program stored in reservoir.
Fig. 5 is a kind of structural schematic diagram of terminal provided in an embodiment of the present invention, including：Processor 50, memory 51, always
Line 52 and communication interface 53, processor 50, communication interface 53 and memory 51 are connected by bus 52；Processor 50 is for executing
The executable module stored in memory 51, such as computer program.
Wherein, memory 51 may include high-speed random access memory (RAM, Random Access Memory),
It may further include non-labile memory (non-volatile memory), for example, at least a magnetic disk storage.By extremely
A few communication interface 53 (can be wired or wireless) is realized logical between the system network element and at least one other network element
Letter connection, can be used internet, wide area network, local network, Metropolitan Area Network (MAN) etc..
Bus 52 can be isa bus, pci bus or eisa bus etc..It is total that bus can be divided into address bus, data
Line, control bus etc..Only to be indicated with a four-headed arrow in Fig. 5, it is not intended that an only bus or one convenient for indicating
The bus of seed type.
Wherein, memory 51 is for storing program, and processor 50 executes program 501 after receiving and executing instruction, aforementioned
Method performed by the device that the stream process that any embodiment of the embodiment of the present invention discloses defines can be applied in processor 50,
Or it is realized by processor 50.
Processor 50 may be a kind of IC chip, the processing capacity with signal.During realization, above-mentioned side
Each step of method can be completed by the integrated logic circuit of the hardware in processor 50 or the instruction of software form.Above-mentioned
Processor 50 can be general processor, including central processing unit (Central Processing Unit, abbreviation CPU), network
Processor (Network Processor, abbreviation NP) etc.；It can also be digital signal processor (Digital Signal
Processing, abbreviation DSP), specific integrated circuit (Application Specific Integrated Circuit, referred to as
ASIC), ready-made programmable gate array (Field-Programmable Gate Array, abbreviation FPGA) or other are programmable
Logical device, discrete gate or transistor logic, discrete hardware components.It may be implemented or execute in the embodiment of the present invention
Disclosed each method, step and logic diagram.General processor can be microprocessor or the processor is also possible to appoint
What conventional processor etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware decoding processing
Device executes completion, or in decoding processor hardware and software module combination execute completion.Software module can be located at
Machine memory, flash memory, read-only memory, programmable read only memory or electrically erasable programmable memory, register etc. are originally
In the storage medium of field maturation.The storage medium is located at memory 51, and processor 50 reads the information in memory 51, in conjunction with
Its hardware completes the step of above method.
Further, the embodiment of the invention also provides a kind of computer readable storage medium, computer readable storage mediums
On be stored with computer program, when which is run by processor execute any of the above-described wireline test signal noise silencing side
The step of method.Specific implementation can be found in embodiment of the method, and details are not described herein.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
Finally it should be noted that：Embodiment described above, only a specific embodiment of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, those skilled in the art should understand that：Anyone skilled in the art
In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention
Within the scope of.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of wireline test signal noise silencing method, which is characterized in that including：
Cable is carried out based on sound Magnetic Sensor linear sensing array to detect resulting detection data, obtains wireline test signal；
Wherein, the sound Magnetic Sensor linear sensing array includes multiple groups sound magnetic signal sensor；
Using maximin criterion method and fixation, the section of thresholding variables corresponding with the wireline test signal is determined；
Optimal threshold in the section is determined using optimal threshold calculating method；
Denoising is carried out to the wireline test signal according to the optimal threshold, obtains noise cancellation signal.
2. being determined the method according to claim 1, wherein described use maximin criterion method and fixation
The step of section of thresholding variables corresponding with the wireline test signal, including：
The corresponding first threshold of the wireline test signal is calculated using maximin criterion method；
The corresponding second threshold of the wireline test signal is calculated using fixation；
According to the first threshold and the second threshold, the section of the corresponding thresholding variables of the wireline test signal is determined.
3. according to the method described in claim 2, it is characterized in that, described determined in the section using optimal threshold calculating method
Optimal threshold the step of, including：
Obtain the corresponding signal noise ratio of the thresholding variables and root-mean-square error function；
Based on the corresponding signal noise ratio of the thresholding variables, signal-to-noise ratio curve is constructed in the section；
Based on the corresponding root-mean-square error function of the thresholding variables, root-mean-square error curve is constructed in the section；
The optimal threshold in the section is determined based on the signal-to-noise ratio curve and the root-mean-square error curve.
4. 3 method according to claim, which is characterized in that described to be missed based on the signal-to-noise ratio curve and the root mean square
Poor curve determines the step of optimal threshold in the section, including：
The signal-to-noise ratio curve and the root-mean-square error curve are normalized, obtain signal-to-noise ratio proportional curve and
Square error proportional curve；
Position the intersection point of the signal-to-noise ratio proportional curve and the root-mean-square error proportional curve；
The optimal threshold in the section is determined according to the intersection point.
5. the method according to claim 1, wherein the method also includes：
Fault localization is carried out to the cable based on the noise cancellation signal, obtains test result；
Generation includes the cable detection report of the test result.
6. a kind of wireline test signal noise silencing device, which is characterized in that including：
Signal obtains module, for detecting based on sound Magnetic Sensor linear sensing array to cable, obtains wireline test letter
Number；Wherein, the sound Magnetic Sensor linear sensing array includes multiple groups sound magnetic signal sensor；
Section determining module, for using maximin criterion method and fixation, determination is corresponding with the wireline test signal
The section of thresholding variables；
Optimal threshold determining module, for determining the optimal threshold in the section using optimal threshold calculating method；
Signal noise silencing module obtains de-noising for carrying out denoising to the wireline test signal according to the optimal threshold
Signal.
7. device according to claim 6, which is characterized in that the section determining module is used for：
The corresponding first threshold of the wireline test signal is calculated using maximin criterion method；
The corresponding second threshold of the wireline test signal is calculated using fixation；
According to the first threshold and the second threshold, the section of the corresponding thresholding variables of the wireline test signal is determined.
8. device according to claim 6, which is characterized in that described device further includes：
Fault localization module obtains test result for carrying out fault localization to cable based on the noise cancellation signal；
Report generation module, for generate include the test result cable detection report.
9. a kind of terminal, which is characterized in that the terminal includes memory and processor, and the memory is supported for storing
Processor perform claim requires the program of any one of 1 to 5 the method, the processor is configured to for executing the storage
The program stored in device.
10. a kind of computer readable storage medium, computer program, feature are stored on the computer readable storage medium
The step of being, the described in any item methods of the claims 1 to 5 executed when the computer program is run by processor.
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Application publication date: 20181116 |