CN109541401A - Cable detection method, device and electronic equipment - Google Patents

Cable detection method, device and electronic equipment Download PDF

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Publication number
CN109541401A
CN109541401A CN201811636051.8A CN201811636051A CN109541401A CN 109541401 A CN109541401 A CN 109541401A CN 201811636051 A CN201811636051 A CN 201811636051A CN 109541401 A CN109541401 A CN 109541401A
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peak
cable
height
relative
lowest point
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CN109541401B (en
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易国锴
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Shanghai Ren Tong Electronic Technology Co Ltd
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Shanghai Ren Tong Electronic Technology Co Ltd
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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
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • 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
    • G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

The present invention provides a kind of cable detection method, device and electronic equipment, after the present embodiment obtains the reflectance data of cable to be measured, it is not directly to be compared it with threshold value, but tracking filter first is carried out to it, obtain the prediction residual of the cable to be measured, opposite blob detection is carried out to prediction residual again, and obtained multiple relative peak data are screened, behind exclusive PCR peak, using obtaining required relative peak and its corresponding peak position, the length of cable to be measured can not only accurately be obtained, the position etc. of terminal state and incipient fault can also be detected, improve cable detection flexibility, and the application is by prediction residual data threshold value, after filtering out required relative peak, testing result is further calculated, for traditional direct mode for determining cable testing result according to threshold value comparison result, it mentions High detection accuracy.

Description

Cable detection method, device and electronic equipment
Technical field
The present invention relates to detection technique fields, set more particularly to a kind of cable detection method, device and electronics It is standby.
Background technique
It is at present usually TDR (Time-Domain Reflectometry, Time Domain Reflectometry) method to detect the quality of cable, Especially by the step response of monitoring cable or the mode of its shock response (differentiating to step response), to be calculated The length of cable.
Inventors noted that the cable detection mode based on step response or its shock response, usually all will acquire Reflectance data (such as Time Domain Reflectometry voltage) is directly compared with preset threshold value, determines detection eventually according to comparison result Point position, and then calculate the length of cable to be measured.
During atual detection, cable usually there will be the various problems such as disconnection, short circuit, aging, impedance be uneven, It will cause the mutation of reflectance data, and for the cable of different length or type, the reflectance data of acquisition and its variation are often It is different, so, the variation of prior art reflectance data directly determines the mode of threshold value, is difficult accurately to obtain cable end The threshold value of point is often influenced by the data mutation that other problems generate, can not accurately obtain the length of cable.
Summary of the invention
In view of the above problems, the present invention provides a kind of cable detection method, device and electronic equipments, by opposite Blob detection result is screened, and the detection such as length, terminal state and incipient fault of cable to be measured can efficiently and be accurately obtained As a result.
To achieve the goals above, the present invention provides following technical schemes:
A kind of cable detection method, which comprises
Obtain the reflectance data of cable to be measured；
Tracking filter is carried out to the reflectance data, obtains the prediction residual of the cable to be measured；
Opposite blob detection is carried out to the prediction residual, obtains relative peak and the peak position at each peak；
The relative peak is screened, using the relative peak and the peak position filtered out, is obtained described The testing result of cable to be measured, the testing result include the position of the length of the cable to be measured, terminal state and incipient fault One or more combinations in setting.
Optionally, described that opposite blob detection is carried out to the prediction residual, obtain the relative peak and peak position at each peak It sets, comprising:
The prediction residual is normalized, prediction residual sequence is obtained；
From prediction residual sequence, the summit height, the lowest point height and peak position at each peak are obtained；
Summit height, the lowest point height according to each peak carry out relative peak calculating, obtain the institute at each peak State relative peak.
Optionally, described from prediction residual sequence, obtain the summit height, the lowest point height and the peak position at each peak It sets, comprising:
Screen the maximum and minimum in the prediction residual sequence；
The maximum is determined as the summit height when leading peak, and the corresponding position of the maximum is determined To be described when the peak position of leading peak；
The lesser minimum adjacent with the maximum position is determined as the lowest point height for working as leading peak；
Summit height, the lowest point height according to each peak carries out relative peak calculating, obtains each peak The relative peak, comprising:
The summit height and the lowest point height at two adjacent peaks are compared respectively；
Based on comparative result, the relative peak at two adjacent peaks is calculated.
Optionally, two adjacent peaks are denoted as first peak and the second peak respectively, and the first peak is earlier than described Second peak generates；It is described based on comparative result, calculate the relative peak at two adjacent peaks, comprising:
If the summit height at second peak is greater than the summit height of the first peak, and described second The lowest point height at peak is greater than the lowest point height of the first peak；Alternatively, the summit height at second peak is small In the summit height of the first peak, and the lowest point height at second peak is less than the paddy of the first peak Bottom height calculates the difference between the summit height at second peak and the lowest point height of the first peak, obtains The relative peak at second peak, and calculate the summit height of the first peak and the paddy at second peak Difference between the height of bottom obtains the relative peak of the first peak；
If the summit height at second peak is greater than the summit height of the first peak, and described second The lowest point height at peak is less than the lowest point height of the first peak；Alternatively, the summit height at second peak is small In the summit height of the first peak, and the lowest point height at second peak is greater than the paddy of the first peak Bottom height calculates the difference between the summit height at second peak and the lowest point height at second peak, obtains The relative peak at second peak, and calculate the summit height of the first peak and the paddy of the first peak Difference between the height of bottom obtains the relative peak of the first peak.
It is optionally, described that the relative peak is screened, comprising:
According to the size of the relative peak, each peak corresponding to the relative peak is ranked up；
Using the forward corresponding peak position in peak in the peak position and sequence of working as leading peak, calculating is described to work as leading peak The multipath reflection position that forward peak generates with the sequence；
Verify whether the relative peak at the multipath reflection position is greater than threshold value；
If so, reducing the relative peak at the multipath reflection position；
Screening is greater than the relative peak of the threshold value.
Optionally, the relative peak and the peak position that the utilization filters out, obtain the inspection of the cable to be measured Survey result, comprising:
The corresponding peak position of relative peak described in the highest filtered out is determined as to detect starting point, by what is filtered out The corresponding peak position of the last one described relative peak is determined as detecting terminal, and calculate the detection terminal with it is described The alternate position spike between starting point is detected, the length of the cable to be measured is obtained；And/or
Based on the prediction residual of the detection terminal point, the state of the detection terminal is determined；And/or
If there is the relative peak filtered out between the detection starting point and the detection terminal, determine There are incipient faults for the cable to be measured, and determine the position of the incipient fault.
A kind of cable detecting device, described device include:
Data acquisition module, for obtaining the reflectance data of cable to be measured；
Filtering module is tracked, for carrying out tracking filter to the reflectance data, the prediction for obtaining the cable to be measured is residual Difference；
Opposite blob detection module obtains the relative peak at each peak for carrying out opposite blob detection to the prediction residual And peak position；
Feature Selection module utilizes the relative peak and institute filtered out for screening to the relative peak Peak position is stated, the testing result of the cable to be measured is obtained, the testing result includes the length of the cable to be measured, terminal One or more combinations in the position of state and incipient fault.
Optionally, the opposite blob detection module includes:
Normalized unit obtains prediction residual sequence for the prediction residual to be normalized；
Data acquiring unit, for obtaining summit height, the lowest point height at each peak from the prediction residual sequence And the peak position；
Relative peak computing unit carries out based on relative peak by summit height, the lowest point height according to each peak It calculates, obtains the relative peak at each peak.
Optionally, the Feature Selection module includes:
Sequencing unit, for the size according to the relative peak, each peak corresponding to the relative peak is arranged Sequence；
Multipath reflection position calculation unit, for corresponding using the forward peak in the peak position and sequence of working as leading peak The peak position calculates the multipath reflection position that the peak forward with the sequence when leading peak generates；
Authentication unit, for verifying whether the relative peak at the multipath reflection position is greater than threshold value；
Crest height adjustment unit is when being, to reduce the multipath reflection for the verification result in the authentication unit The relative peak at position；
Relative peak screening unit, for screening the relative peak for being greater than the threshold value.
The present invention also provides a kind of electronic equipment, including processor and memory；Wherein:
Memory is for storing computer instruction；
Processor is used to execute the computer instruction of the memory storage, specifically executes above-described cable Each step of detection method.
It can be seen that compared with prior art, the present invention provides a kind of cable detection method, device and electronic equipment, this It is not to be directly compared it with threshold value, but first carried out to it after embodiment obtains the reflectance data of cable to be measured Tracking filter obtains the prediction residual of the cable to be measured, then carries out opposite blob detection to prediction residual, and each to what is obtained The relative peak at peak is screened, behind exclusive PCR peak, using required relative peak and peak position is obtained, can be accurate The testing results such as the position to the length of cable to be measured, detection terminal state and incipient fault.As it can be seen that provided in this embodiment Cable detection method is not to be directly arranged threshold value by the reflectance data that detects, but by the relative data of prediction residual, It determines the threshold value of relative peak needed for screening, and eliminates interference peak in this process, thus according to the opposite peak filtered out Value and peak position, can reliably detect the incipient fault of cable to be measured, to carry out troubleshooting to the incipient fault, mention High cable use reliability to be measured, and effectively eliminate the dry of the multipath reflection generated to cable to be measured application pumping signal It disturbs, improves detection accuracy, length of cable can only be detected by solving traditional detection method, can not detect cable incipient fault Computational problem.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will to embodiment or Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only The embodiment of the present invention for those of ordinary skill in the art without creative efforts, can be with Other attached drawings are obtained according to the attached drawing of offer.
Fig. 1 a shows a kind of existing cable detection method schematic diagram based on step response；
Fig. 1 b shows the existing another cable detection method schematic diagram based on step response；
Fig. 2 a shows a kind of existing cable detection method schematic diagram based on shock response；
Fig. 2 b shows the existing another cable detection method schematic diagram based on shock response；
Fig. 3 a shows a kind of system architecture schematic diagram for realizing cable detection method provided by the invention；
Fig. 3 b shows another system architecture schematic diagram for realizing cable detection method provided by the invention；
Fig. 4 shows a kind of flow diagram of cable detection method provided in an embodiment of the present invention；
Fig. 5 is shown in cable detection method provided in an embodiment of the present invention, to there are the cable to be measured of incipient fault into The schematic diagram of line trace filtering processing；
Fig. 6 shows the flow diagram of another cable detection method provided in an embodiment of the present invention；
Fig. 7 a is shown in cable detection method provided in an embodiment of the present invention, carries out opposite blob detection to prediction residual The schematic diagram of process；
Fig. 7 b is shown in cable detection method provided in an embodiment of the present invention, carries out opposite blob detection to prediction residual As a result schematic diagram；
Fig. 8 a shows a kind of calculating for the relative peak being related in cable detection method provided in an embodiment of the present invention Schematic diagram；
Fig. 8 b shows the meter for another relative peak being related in cable detection method provided in an embodiment of the present invention Calculate schematic diagram；
Fig. 9 shows the flow diagram of another cable detection method provided in an embodiment of the present invention；
Figure 10 a shows the field that cable detection method provided in an embodiment of the present invention is suitable for having the cable to be measured of knotting Scape schematic diagram；
Figure 10 b shows the cable to be measured that cable detection method provided in an embodiment of the present invention is suitable for having coupler Schematic diagram of a scenario；
Figure 10 c shows the cable to be measured that cable detection method provided in an embodiment of the present invention is suitable for having short circuit Schematic diagram of a scenario；
Figure 11 shows a kind of structural schematic diagram of cable detecting device provided in an embodiment of the present invention；
Figure 12 shows the structural schematic diagram of another cable detecting device provided in an embodiment of the present invention；
Figure 13 shows the structural schematic diagram of another cable detecting device provided in an embodiment of the present invention；
Figure 14 shows a kind of hardware structural diagram of cable detection device provided in an embodiment of the present invention.
Specific embodiment
It was found by the inventors of the present invention that when calculating length of cable to be measured based on step response, since cable believes excitation Number low-pass filtering effect, terminal reflected voltage rise it is not precipitous, in this way, the time domain of cable to be measured as shown in Figure 1a is anti- Voltage curve is penetrated, thresholding setting too high (such as Fig. 1 a setting thresholding is higher than terminal reflected voltage) will will increase range measurement error, 10% or more can even be reached；(threshold voltage is arranged in such as Fig. 1 b to reflect less than terminal if instead threshold voltage setting is too small Voltage, but it is greater than the reflected voltage of incipient fault point), it will it is influenced by incipient fault, and causes to judge by accident.
Similarly, in the design for calculating length of cable to be measured based on shock response, the shock response referring to shown in Fig. 2 a Schematic diagram, i.e., the schematic diagram differentiated to above-mentioned step response, since the response of characterization terminal reflection is usually a pole It is worth low and big width peak, detection threshold setting is excessively high, it is easy to cause missing inspection, cause testing result error larger；Such as Fig. 2 a Shown in shock response schematic diagram and be easy to incipient fault point being mistaken for terminal if thresholding setting is too low.
It can be seen that either which kind of detection mode, whether threshold value setting is suitable, directly affects cable testing result Accuracy, it is still, more due to influencing the uncertain factor of detection of each cable, be difficult to be previously obtained suitable threshold value, So inventor considers not using setting threshold voltage, the design detected to length of cable is realized.
In addition, inventor is also noted that existing above two cable detection method, it is disconnected mainly to solve single cable Open, short trouble identifies and positions, if but be superimposed with other incipient fault factors, as connector poor contact, route are old Change, have the problems such as coupler, cable impedance is uneven, existing cable detection method often due to error is larger, be interfered, The reasons such as multipath reflection can not be applicable in, and cause testing result accuracy lower.
In order to improve cable detection accuracy, and it is suitable for the detection of various problems, the present inventor proposes filtering Estimation+opposite blob detection+feature extraction screening mode, the detection of Lai Shixian cable, concrete methods of realizing are referred to hereafter phase The description of embodiment is answered, the present embodiment is not described in detail here.
In order to keep the above objects, features and advantages of the present invention more obvious and easy to understand, below in conjunction with of the invention real The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general Logical technical staff every other embodiment obtained without making creative work, belongs to protection of the present invention Range.
Referring to Fig. 3 a and Fig. 3 b, the system structure diagram for the cable detection method that embodiment provides to realize the present invention, In practical applications, when treating survey line cable and being detected, TDR (Time-Domain can be used by cable detector Reflectometry, Time Domain Reflectometry) measurement method, the measurement method of the TDR is not detailed.
Optionally, the present embodiment can use system structure as shown in Figure 3a, by cable detector treat survey line cable into When row TDR is measured, i.e., emit pumping signal from test side, and obtain the reflection of terminal (the practical terminal of cable or fault point etc.) Voltage is directly handled by reflected voltage of the cable detector to acquisition later, to obtain the detection knot of cable to be measured Fruit, as the length of cable to be measured, terminal state and incipient fault position in one or more combinations.
In this case, above-mentioned cable detector can be the transmitting of collection signal and acquisition and signal processing setting in one It is standby, it detects for convenience, can be handheld device, naturally it is also possible to it is the equipment of other structures, it can be according to actual needs Configure the structure composition and its contour structures and usage mode etc. of cable detector, the embodiment of the present invention is another herein One is described in detail.
In another alternative embodiment of the present invention, the system structure of cable detection method provided by the invention is realized, it can also To use framework as shown in Figure 3b, in this framework, cable detector can be merely responsible for transmission and the reflection electricity of pumping signal The acquisition of pressure handles part for follow-up signal, can be realized by computer equipment, and the computer equipment can also be controlled Cable detector processed realizes that signal transmitting and acquisition, specific implementation flow the present embodiment are not detailed.
Wherein, computer equipment can be laptop, mobile phone, server or other equipment, and the present invention is to the calculating The product type of machine equipment is without limitation.
The system architecture in conjunction with shown in figure 3 above a and Fig. 3 b is a kind of cable provided in an embodiment of the present invention referring to Fig. 4 The flow diagram of detection method, this method computer equipment can be held shown in the cable detector as shown in Fig. 3 a or Fig. 3 b Row, the i.e. equipment with data-handling capacity execute, as shown in figure 4, this method may include but be not limited to following step It is rapid:
Step S11 obtains the reflectance data of cable to be measured；
For the transmit circuit of cable detector to after cable transmission pumping signal (i.e. step voltage) to be measured, sample circuit can It to be sampled to reflected voltage, can specifically be sampled according to certain time interval, be become at any time to obtain voltage The curve of change is denoted as Time Domain Reflectometry voltage curve.The reflectance data that the present embodiment step S11 is obtained can indicate that the time domain is anti- Voltage curve is penetrated, that is, constitutes each time domain emitting voltage of the Time Domain Reflectometry voltage curve.
Optionally, in order to improve detection reliability and accuracy, for the reflectance data directly sampled, Ke Yijin Subsequent detection processing is carried out again after row pretreatment, may include at low-pass filtering to the pretreatment for sampling obtained reflectance data Reason, low-pass filter such as gentle using an intermediate zone, is filtered reflectance data, to eliminate the reflection of some mutation Curvilinear trend and variation are not changed while data, i.e. elimination curve burr, to improve the accuracy of subsequent peak detection.
Wherein, FIR (the Finite Impulse Response) filter of 10 ranks or so can be used in the embodiment of the present invention Wave device implements process the present embodiment and is not described further to the low-pass filtering treatment for directly sampling obtained reflectance data, and It is not limited to this filter, it can be determine according to actual needs.
Step S12 carries out tracking filter to reflectance data, obtains the prediction residual of cable to be measured；
In conjunction with above description, the reflectance data of acquisition is the Time Domain Reflectometry voltage of one group and association in time, specifically be can be Time Domain Reflectometry voltage is with the time (i.e. sampling time) or apart from the variation of (i.e. the distance between current sampling point and test point) The curve of generation, the curve at this time can be pretreated curve.
Due to carrying out Time Domain Reflectometry voltage in the manner described above in the case where cable to be measured is without any excitation and response Sampling, obtained reflected voltage curve should be one and keep smooth constant straight line.The present embodiment applies to cable to be measured to swash Signal is encouraged, the reflected voltage for formerly sampling and obtaining is can use, the reflected voltage of subsequent sampling is predicted, if predicted value It differs greatly with measured value (i.e. actual samples to Time Domain Reflectometry voltage), it is believed that there are pumping signals in cable to be measured Or response signal (i.e. the reflected voltage of excited target effect of signals generation).
Based on this design, the present embodiment can use tracking filter algorithm, estimate to the reflected voltage data of acquisition Meter, to obtain the predicted value of subsequent reflection voltage, and calculates predicted value measured value corresponding to what is actually obtained and (actually obtains The reflected voltage taken) difference, which is denoted as prediction residual by the present embodiment, to carry out subsequent place to the prediction residual Reason.
The tracking filter curve synoptic diagram of reflectance data referring to Figure 5, the reflectance data obtained due to the present embodiment It can be curve (curve in such as Fig. 5 is 1.), by tracking filter algorithm, obtained predicted value is also to change over time and become Change, to obtain prediction curve (curve in such as Fig. 5 is 2.), similarly, by corresponding instance sample to reflectance data, that is, measured value Difference between predicted value, also an available prediction difference curve (curve in such as Fig. 5 is 3.).
Optionally, above-mentioned tracking filter algorithm can be alpha-beta tracking filter algorithm, it may be assumed that
Sp(n)=α * So(n-1)+β*Sp(n-1) (1)
In above-mentioned formula (1), Sp(n) the curve prediction value at n moment, S can be indicatedo(n-1) the n-1 moment can be indicated The obtained reflectance data of measured value, that is, actual samples, α is to obtain at the measured value that previous moment samples and current time The influence degree of predicted value, usually more than 20%, the present embodiment to the specific value of α without limitation；β is accumulative prediction Value samples current time to obtain the influence degree of measured value, under normal conditions alpha+beta=100%.
By formula (1) it is known that when the predicted value for needing to predict current time reflectance data, when can use previous It carves the predicted value obtained and measured value and summation is weighted, when being calculated current according to the proportionate relationship between the two The predicted value at quarter, and so on, it can continue to obtain the predicted value at next moment, to obtain predicted value curve.
It is to be appreciated that about the tracking filter algorithm in step S12, it is not limited to this alpha-beta of the present embodiment description Tracking filter algorithm, the present invention only obtain prediction residual as example.
Step S13 carries out opposite blob detection to prediction residual, obtains relative peak and the peak position at each peak；
Wherein, relative peak is the relative altitude at the peak occurred in prediction residual, which can generate position by the peak Set the expression of the distance between test point, can also be generated by the peak position sampling time and between detection time Time difference expression etc..
It should be noted that can first be taken absolutely to obtained prediction residual before the present embodiment carries out opposite blob detection Value, then carry out opposite blob detection and handle, specifically it is referred to the description of Examples below corresponding portion.
The present embodiment can use the mode of opposite blob detection, to extract the feature of reflectance data, due to theoretically normal Cable be usually not in peak (i.e. accidental data), but actual cable is because of uneven and noise factor, it is possible that Such as the peak in 0%-5% preset range, it is generally the case that it is considered that the peak occurred within the scope of this belongs to normal condition, if super Cross the preset range, it is believed that cable there is a problem.Therefore, the present invention can be based on the preset range, exclude because multiple Interference of the signal wave to testing result that the factors such as reflection generate, specific implementation process are referred to hereafter corresponding embodiment Description.
Step S14, screens relative peak；
After above description, the reflectance data of the positions such as the point of the incipient fault as present in cable to be measured, terminal, generation Peak value is high, and generally smaller for peak value caused by multipath reflection etc., and the peak difference at both peaks is away from larger, so, this Embodiment can use preset threshold (preset range i.e. above), and screening is more than the relative peak of the preset threshold, exclusive PCR Peak value filters out required relative peak and corresponding peak position, can directly determine from obtained multiple relative peaks The relative peak of the testing result of cable to be measured and peak position out.
It is to be appreciated that how the present invention is to screen multiple relative peaks, the implementation method of exclusive PCR peak value is not It limits, the method for being referred to hereafter corresponding embodiment description, but is not limited to method described herein.
Step S15 obtains the testing result of cable to be measured using the relative peak and peak position filtered out.
Wherein, the testing result that the present embodiment obtains may include length, terminal state and the potential event of the cable to be measured One or more combinations in the position of barrier.
Optionally, the present embodiment (can be higher than the relative peak of threshold value, the present invention can to the relative peak filtered out To be known as peak where this kind of relative peak to detect peak) it is compared, by the corresponding peak position of highest relative peak labeled as sharp Signal starting point is encouraged, that is, detection starting point is to apply the position of pumping signal to cable to be measured, by the last one relative peak Corresponding peak position is determined as detecting terminal, at this point, since the peak value for having excluded multipath reflection generation does testing result It disturbs, therefore, required inspection can be obtained directly using the relative peak and corresponding peak heights of detection starting point and detection terminal Survey result.
Such as, simple plus and minus calculation can be passed through, calculate the length of cable to be measured, i.e., the crest location of detection terminal with The alternate position spike between the crest location of starting point is detected, the length of cable to be measured is obtained；If the prediction residual of detection terminal is positive Number, it is believed that final position short circuit；If the prediction residual for detecting terminal is negative, it is believed that final position open circuit；If detecting Also other detection peaks (peak that the relative peak filtered out is greater than threshold value) between point and detection terminal, illustrate to survey line Cable can recorde position and the crest height at these detection peaks there are incipient fault, so as to subsequent monitoring or further investigation.
In conclusion being not directly to carry out itself and threshold value after the present embodiment obtains the reflectance data of cable to be measured Compare, but tracking filter first is carried out to it, obtains the prediction residual of the cable to be measured, then opposite peak is carried out to prediction residual Detection, and obtained multiple relative peaks are screened, exclusive PCR peak value obtains required relative peak and its correspondence Peak position accurately obtain length, the detection terminal of cable to be measured thus using the relative peak and its peak position that filter out The testing results such as the position of state and incipient fault.
As it can be seen that be not the direct variation using the reflectance data detected, to determine the testing result of cable to be measured, But the opposite blob detection result of prediction residual is utilized to realize that, relative to the variation of reflectance data, the present embodiment passes through to prediction After the opposite blob detection of residual error, cable normal position and off-normal position (such as starting point, terminal, incipient fault can be obviously protruded Point) at peak difference away from, no matter for what length cable, according to this processing of the present embodiment, both obtained positions The peak difference at place is set away from essentially identical, therefore, the threshold value that the present embodiment thereby determines that can be filtered out more accurately improper Position and its peak value can reliably detect the incipient fault of cable to be measured, to carry out failure row to the incipient fault It removes, improves cable use reliability to be measured, and effectively eliminate the multipath reflection for applying pumping signal to cable to be measured and generating Interference, improve detection accuracy.
Referring to Fig. 6, for the flow diagram of another cable detection method provided in an embodiment of the present invention, this method with The applicable object of the above method is similar, and the present embodiment mainly carries out example description to the opposite blob detection process of prediction residual, closes In obtaining the process of prediction residual, it is referred to the description of above-described embodiment step S11 and step S12, the present embodiment does not do superfluous It states, as shown in fig. 6, this method may include but be not limited to following steps:
Step S21, is normalized prediction residual, obtains prediction residual sequence；
In practical applications, method for normalizing may include data (i.e. prediction residual) are transformed to it is small between (0,1) Number, or the expression formula for having dimension is become into dimensionless expression formula, to facilitate subsequent progress data extraction.Based on this, for upper The prediction residual of constituent curve 3. in Fig. 5 is stated, is normalized after taking absolute value to it, it is available as shown in Figure 7a Curve (i.e. prediction residual sequence), but be not limited to curve shown in Fig. 7 a.
Step S22 obtains the summit height, the lowest point height and peak position at each peak from prediction residual sequence；
For multiple prediction residuals in the prediction residual sequence after normalization, the present embodiment can be directly according to numerical value Size, be screened out from it includes all peaks, and obtain the summit height and the lowest point height at each peak.
Specifically, the present embodiment may search for multiple maximum that prediction residual sequence includes, that is, determine it includes it is more The summit height h_max at a peak and corresponding sequence n, it is later, residual from predicting such as the position that each inverted triangle in Fig. 7 a marks Multiple minimums in difference determine the lowest point the height h_min and its sequence n of respective peaks.
Wherein, since each maximum or so meeting is there are two minimum, the present embodiment can will be adjacent with maximum position Lesser minimum, be determined as minimum corresponding with the maximum, so that it is determined that the summit height at each peak and the lowest point Highly, and sequence n locating for the peak is recorded.It is to be appreciated that the value of the sequence n about the present embodiment can indicate the moment, it can also To indicate distance that voltage signal is propagated within the unit time, one can be kept with curvilinear abscissa data shown in Fig. 7 a It causes.
Step S23, summit height and the lowest point height according to each peak carry out relative peak calculating, obtain each peak Relative peak；
In the present embodiment, the phase at the peak can be obtained by calculating the summit height at each peak and the difference of the lowest point height To peak value (i.e. the height of summit to the lowest point), then the comparison result of the summit height based on two neighboring peak and the lowest point height, adjust The relative peak of whole respective peaks obtains song as shown in Figure 7b to carry out subsequent detection processing using relative peak adjusted Each peak that line includes.
Specifically, can be since sequence n=1, according to this calculation of H (n)=h_max (n)-h_min (n), meter The relative peak for calculating each peak, the height at peak for being 1 for sequential value can be H (1)=h_max (1)-h_min (1), for The height at the peak that sequential value is 2 can be H (2)=h_max (2)-h_min (2).So analogize, available each sequential value pair The relative peak at each peak answered, and indicate by the sequential value position at the peak, to realize the positioning to each peak.
It in practical applications, may not be independent, that is to say, that can for the peak filtered out in the manner described above There are two or more peaks to belong to same seat mountain for energy, in this case, it is thus necessary to determine that the main peak on this mountain, so that one Mountain retains a main peak, carries out subsequent processing.
Optionally, for the convenience of description, two peaks for arbitrary neighborhood, what the present embodiment can generate wherein evening Peak is denoted as first peak, another peak is denoted as the second peak, and thus, first peak is generated earlier than the second peak.
The present embodiment can be compared the summit height of first peak and the second peak, while to first peak and the second peak The lowest point height be compared, so as to based on comparative result, determine how adjust the two peaks height.
Specifically, by comparing, as shown in Figure 8 a, if the summit height at the second peak is greater than the summit height of first peak, And second peak the lowest point height be greater than first peak the lowest point height, i.e. h_max (2)>h_max (1), h_min (1)<h_min (2), illustrate that the wave crest of the crest ratio first peak at newly generated second peak is higher, and trough is higher, in this case, can recognize It is located at same seat mountain with the wave crest before generated for newly generated wave crest, i.e., on the same peak, i.e. first peak and the second peak belongs to The same peak, and the peak produces two wave crests, but the wave crest that evening generates is main wave crest.At this point, the present embodiment recalculates this The relative peak of wave crest.
Optionally, the present embodiment calculates the difference between the summit height at the second peak and the lowest point height of first peak, obtains The relative peak (relative peak of i.e. main wave crest) at the second peak certainly can also change for the relative peak of first peak, Difference as between the summit height of first peak and the lowest point height at the second peak.Therefore, by the meter of above-mentioned relative peak It calculates, crest height H (2)=h_max (the 2)-h_min (1) at the opposite peak at finally obtained second peak, updated first peak Opposite peak crest height H (1)=h_max (1)-h_min (2).
Similarly, as shown in Figure 8 b, if the summit height at the second peak is greater than the summit height of first peak, and the paddy at the second peak Bottom height is less than the lowest point height of first peak, calculates the difference between the summit height at the second peak and the lowest point height at the second peak, The relative peak at the second peak, H (2)=h_max (2)-h_min (2) are obtained, and calculates the summit height and first peak of first peak The lowest point height between difference, obtain the relative peak of first peak, i.e. H (1)=h_max (1)-h_min (1).
In addition, if the summit height at the second peak is less than the summit height of first peak, and the lowest point height at the second peak is less than the The lowest point height at one peak can use above-described H (2)=h_max (2)-h_min (1), H (1)=h_max (1)-h_ Min (2) calculation, to obtain the relative peak of first peak and the relative peak at the second peak.
If the summit height at the second peak is less than the summit height of first peak, and the lowest point height at the second peak is greater than first peak The lowest point height, above-described H (1)=h_max (1)-h_min (1), H (2)=h_max (2)-h_min (2) can be used Calculation, to obtain the relative peak of first peak and the relative peak at the second peak.The embodiment of the present invention is no longer described in detail one by one.
For figure 7 above a and Fig. 7 b, Fig. 7 a shows opposite peak retrieving, as shown in Figure 7a, to prediction residual During sequence carries out opposite blob detection, many peaks may be detected, by the above-described opposite peak of the embodiment of the present invention It is worth calculating process, the present embodiment can only retain the main peak for belonging to same seat mountain, opposite in curve shown in obtained Fig. 7 b Less peak reduces subsequent processing workload.It is to be appreciated that Fig. 7 a and Fig. 7 b are only used to illustrate using opposite blob detection to pre- The related data for surveying peak in residual sequence changes, and is not offered as the actual phase of prediction residual curve of cable to be measured shown in upper figure To blob detection process.
Based on the cable detection method of each embodiment description above, referring to Fig. 9 be it is provided in an embodiment of the present invention another The flow diagram of cable detection method, the present embodiment mainly to opposite blob detection is completed after, how to obtained relative peak It is screened, is described with obtaining the testing result process of cable to be measured, realization step before this is referred to The description of each embodiment corresponding portion is stated, this embodiment is not repeated, as shown in figure 9, this method may include but not limit to In following steps:
Step S31, according to the size of relative peak, each peak corresponding to relative peak is ranked up；
If foregoing embodiments describe, during opposite blob detection, the feature of original predictive residual error is done and has further been added Strength reason, so that the screening of required relative peak becomes easy, as shown in Figure 7a, since most of relative peak all maintains Between 1% to 2%, only a few relative peak appears in 5% or more, and therefore, the present embodiment can be all based on what is filtered out The relative peak at peak, threshold value are obtained so as to the subsequent screening for being realized each relative peak based on the threshold value beyond threshold value Opposite peak.
It is to be appreciated that the dimension of the above-mentioned peak value of the present embodiment is 1, i.e., 100%, due to carrying out during opposite blob detection Normalized, theoretically normal cable to be measured is not in opposite peak, that is, the relative peak that is calculated is 0, but by In the factors such as noise and cable to be measured be uneven, as shown in Figure 7b, it is possible that the relative peak between 0%~5%, institute With the present embodiment can be determined as threshold value for 5%, it is believed that obtained more than the relative peak of the threshold value possible at crest location There are problems.But the threshold value is not limited to 5%, can according to opposite blob detection result determine, the present invention only as example into Row explanation.
In addition, can be set to 5% or 5% according to the threshold value after above-mentioned processing normalization for conventional cable to be measured Left and right, if cable to be measured is the cable of 5 classes or more, suitably can be reduced to 3% for threshold value；If cable to be measured is that WTB twists formula column Vehicle bus can improve the threshold value to 6% or so etc., it is seen then that for different types of cable to be measured, determining threshold value Often difference, can be determines according to actual conditions, it is not limited to threshold value enumerated herein.
It is often bigger for the relative peak of fault point, detection starting point and detection terminal point such as analysis above, this Embodiment can be ranked up (such as from big the opposite blob detection by above-described embodiment description, obtained all relative peaks To it is small sequence etc.), at this point it is possible to by the highest point of relative peak be labeled as pumping signal starting point, i.e., detection starting point, for Detect terminal, it is also necessary to further screening be done to obtained relative peak, exclude the interference of multipath reflection.
Step S32, using peak position corresponding with the forward peak in the peak position and its sequence for working as leading peak, leading peak is worked as in calculating The multipath reflection position generated with the forward peak that sorts；
In practical application, electric signal is propagated in the medium, at impedance discontinuity (such as detection device and cable to be measured Junction) it is likely to occur reflection, and the signal of multiple reflections can be superimposed with original signal, cause to judge by accident, therefore, the present embodiment needs The Interference Peaks at multipath reflection position are eliminated, specifically can first determine that multipath reflection position, then the peak detected at the position are No is Interference Peaks.
It can be with about multipath reflection method for determining position are as follows: determine that the highest peak position of relative peak is set to detection starting point Position, later, according to relative peak ranking results, it is more with the first high peak generation can to calculate it for the peak high for second Weight reflection position；The peak high for third can calculate separately its multipath reflection position generated with the second high peak, and The multipath reflection position that itself and the first high peak generate, and so on, the peak of corresponding sequence rearward, it is thus necessary to determine that the peak and its The multipath reflection position that each peak for sorting forward generates.
Specifically, the present embodiment can use the transmission range symmetry of multipath reflection, to calculate multipath reflection position, If the peak position on the first peak is set to N1, the peak position on the second peak is set to N2, and the peak position on third peak is set to N3, successively type, the The peak position at the peak of m high is set to Nm.If N2 > N1, the multipath reflection position that the first peak and the second peak generate can be N2+ (N2-N1)；If N3 > N2, and (i.e. compared with the first peak and the second peak, third peak distance detection starting point is most by N3 > N1 Far), the multipath reflection position that third peak and the second peak generate can be N3+ (N3-N2), third peak and the first peak The multipath reflection position of generation can be N3+ (N3-N1).
It can be seen that multipath reflection generate position usually work as leading peak distal end, when calculating multipath reflection position, when Leading peak sort than it forward peak position numerical value it is big, the peak position at the forward peak of sorting can be subtracted with the position when leading peak, Obtain working as leading peak and sequence by the distance between leading peak, along with the position for working as leading peak, the available sequence is forward to own Peak and the multipath reflection position generated when leading peak.
Step S33, verifies whether the relative peak at multipath reflection position is greater than threshold value, if so, executing step S35； If not, executing step S34；
Wherein, the numerical values recited of the threshold value can be determined based on opposite blob detection result above, such as 5%, the present embodiment pair Its specific value is without limitation.
Step S34 deletes the peak of the multipath reflection position；
Such as above-mentioned analysis, the present embodiment can consider that crest height belongs to interference wave crest less than the peak of threshold value, can be direct It rejects.
Step S35 reduces the relative peak at the multipath reflection position；Since to will lead to this more for the multipath reflection of generation Weight reflection position at original signal relative peak increase so, in order to improve detection accuracy, primarily determining multipath reflection In the case that peak at position is detection peak, the application can be by reducing the relative peak at multipath reflection position, Lai Jinyi Step demonstrate,proves whether the peak at the multipath reflection position is detection peak, tune of the application to the relative peak at multipath reflection position Perfect square formula without limitation, such as (can be specific value, or the hundred of current relative peak according to preset peak value adjustment amount Divide ratio etc.), the relative peak at multipath reflection position is reduced into the peak value adjustment amount, or utilize the two of generation multipath reflection The relative peak at a peak determines peak value adjustment amount etc..
Wherein, the specific implementation of the second way of the determination peak value adjustment amount proposed for upper section, can use H_ New=H_ori-H_mir mode is calculated.Wherein, after H_new can be the reduction at the peak at the multipath reflection position Relative peak, H_ori are the relative peak before the reduction at the peak at the multipath reflection position, and H_mir is multipath reflection position pair The influence of relative peak, specific H_mir=H_ref1 × H_ref2, H_ref1 and H_ref2 are that generate this multiple anti-respectively The relative peak H at two peaks penetrated.
Later, the present embodiment can further judge whether all relative peaks after reducing are less than threshold value, to delete phase It is less than the peak of threshold value to peak value, i.e. deletion Interference Peaks.
Step S36, screening are greater than the relative peak of threshold value；
In the present embodiment, after opposite blob detection, interference of the multipath reflection to relative peak can be further excluded, To guarantee that the relative peak that filters out is that crest height is caused to be greater than threshold value by original signal, rather than because multipath reflection is superimposed Relative peak is caused to be greater than threshold value.It is to be appreciated that the method for removing about multipath reflection interference, it is not limited to above description Mode.
The corresponding peak position of highest relative peak filtered out is determined as detecting starting point, filter out most by step S37 The corresponding peak position of the latter relative peak is determined as detecting terminal, calculates detection terminal and detects the alternate position spike between starting point, Obtain the length of cable to be measured；
As it can be seen that the corresponding peak position of highest relative peak filtered out is actually pumping signal starting position, and it is last One after of position in the peak position of one relative peak, i.e. all detection peaks (i.e. relative peak be greater than threshold value peak) The location of peak is cable final position to be measured.Therefore, length of cable to be measured=detection terminal peak position-detection starting point Peak position.
Wherein, peak position can be the distance that voltage signal is propagated within the unit time, be also possible to constantly etc., if Its propagation distance can also be calculated multiplied by spread speed of the voltage signal in cable to be measured in moment, to be measured to obtain The length of cable.
Step S38 determines the state of the detection terminal of cable to be measured based on the prediction residual of the detection terminal；
Optionally, if the prediction residual of detection terminal is positive number, it is believed that detection terminal is short circuit；Conversely, if detection The prediction residual of terminal is negative, it is believed that detection terminal is open circuit.
Step S39 determines cable to be measured if there is the relative peak filtered out between the detection terminal and detection starting point There are incipient faults, and determine the position of the incipient fault.
After above-mentioned Screening Treatment, if there is also detection peaks between detection terminal and detection starting point, it is believed that detection There are incipient fault between terminal and detection starting point, the present embodiment can recorde the relative peak and peak position at existing detection peak It sets, by the peak position recorded, determines the position of incipient fault.When the type for needing further to test and analyze incipient fault, i.e., Incipient fault is specifically any failure, and the incipient fault caused by what reason can combine at the incipient fault position of record Relative peak analyzed, concrete methods of realizing the application is not detailed.
It can be seen that, according to the present embodiment method as described above, being calculated if cable to be measured has disconnection, short-circuit conditions The practical length of obtained cable to be measured is exactly to disconnect/location of short circuit；If there are connector poor contacts, line in cable to be measured Road aging has the problems such as coupler, cable impedance is uneven, is capable of detecting when these incipient fault positions, and will not influence to Survey the calculating of length of cable.That is, the present invention by single end testing TDR, effectively excludes multipath reflection interference, according to inspection Length of cable to be measured can be efficiently and accurately calculated in survey demand, provide detection terminal open circuit/short circuit state, and can also Position incipient fault point position.
For example, 325 meters of cable detection schematic diagram shown in 0a and Figure 10 b referring to Fig.1, since sampling instant, Abscissa can be converted to distance from the time, described according to above-described embodiment by the present embodiment according to voltage signal spread speed Opposite blob detection mode, the highest being calculated appears in the 260 meters or so (asterisks of the highest point in such as Figure 10 a with respect to peak Position), other two higher opposite peaks appear in 410 meters, 590 meters or so.At this point it is possible to think 260 meters or so opposite Peak is the position that pumping signal starts, i.e. detection start position, whole for the detection of cable to be measured at 590 meters or so of opposite peak Position is put, 410 meters or so of opposite peak between the two positions can be the position of incipient fault.
According to above-described testing result acquisition modes, 327.9 meters of length of cable to be measured can be calculated to obtain, detection is eventually The corresponding prediction residual of point is negative, and determines the detection terminal for open circuit；Due to there are the higher opposite peak in the peak at 410 meters, this There may be incipient faults at place, i.e., there are a cables to knot at 150 meters of starting point away from cable detection, impedance is raised potential Failure.
Wherein, in original time domain reflected voltage, such as measured value (i.e. sampled value) curve in Figure 10 a it is found that being located at excitation After signal at 515 meters (at i.e. 775 meters), the mutation of the curve as caused by multipath reflection, and the relative peak generated, according to above-mentioned Screening Treatment mode can exclude automatically, will not interfere to testing result, ensure that the testing result of cable to be measured Reliability.
Similarly, as shown in fig. lob the long cable detection method schematic diagram for having coupler of 325 meters, the cable to be measured exist After having crossed coupler at 150 meters, according to the processing means that foregoing embodiments provide, finishing screen selects 260 meters, 410 meters and 590 Rice or so place, relative peak are greater than the peak of threshold value, it is possible thereby to determine that first peak is the peak for detecting starting point, second peak is Opposite peak caused by potential partially perceptual failure, third peak is the peak for detecting terminal, and it is to be measured may further to calculate this automatically The length of cable is 324.1 meters, which does not cause to judge by accident to the calculating of length of cable, and mark incipient fault Peak position.
In addition, occurring the cable detection method schematic diagram of short circuit, the inspection about the cable to be measured shown in 0c referring to Fig.1 It is similar with the detection location determining method of terminal to survey starting point, thus calculating the length of cable to be measured automatically is 148.5 meters, and It detects starting point and detects the peak for being greater than threshold value there is no relative peak between terminal and (peak is detected, as asterism forms in Figure 10 c Curve), therefore, cable to be measured be not present incipient fault, and due to detection terminal prediction difference data be positive, thus, to The detection terminal of survey line cable can be short trouble.
Referring to Fig.1 1, it is a kind of structural schematic diagram of cable detecting device provided in an embodiment of the present invention, which can be with Applied to cable detector as shown in Figure 3a or computer equipment as shown in Figure 3b, as shown in figure 11, which be can wrap It includes:
Data acquisition module 11, for obtaining the reflectance data of cable to be measured；
Filtering module 12 is tracked, for carrying out tracking filter to reflectance data, obtains the prediction residual of cable to be measured；
Wherein, process is realized about the tracking filter to reflectance data, be referred to above method embodiment corresponding portion Description.
Opposite blob detection module 13, for carrying out opposite blob detection to prediction residual, obtain each peak relative peak and Peak position；
Optionally, as shown in figure 12, this may include: with respect to blob detection module 13
Normalized unit 131 obtains prediction residual sequence for prediction residual to be normalized；
Data screening unit 132, for from prediction residual sequence, obtain the summit height at each peak, the lowest point height and Peak position；
Relative peak computing unit 133 carries out based on relative peak by summit height, the lowest point height according to each peak It calculates, obtains the relative peak at each peak.
In another alternative embodiment of the present invention, data screening unit 132 may include:
Extreme value screens subelement, for screening maximum and minimum in prediction residual sequence；
Summit height determines subelement, for the maximum to be determined as to the summit height when leading peak, and greatly by this It is worth corresponding position to be determined as when the peak position of leading peak；
The lowest point height determines subelement, for by the lesser minimum adjacent with maximum, being determined as the paddy when leading peak Bottom height；
Correspondingly, relative peak computing unit 133 may include:
Comparing subunit, for two adjacent peaks summit height and the lowest point height be compared respectively；
Relative peak computation subunit, for based on comparative result, calculating the relative peak at two adjacent peaks.
In the present embodiment practical application, if adjacent peak is denoted as first peak and the second peak, and first peak is earlier than the second peak It generates, above-mentioned relative peak computation subunit can specifically include:
First computation subunit, the summit height for the summit height when the second peak greater than first peak, and the second peak The lowest point height is greater than the lowest point height of first peak；Alternatively, summit height of the summit height at the second peak less than first peak, and the The lowest point height at two peaks be less than first peak the lowest point height, calculate the second peak summit height and first peak the lowest point height it Between difference, obtain the relative peak at the second peak, and calculate between the summit height of first peak and the lowest point height at the second peak Difference obtains the relative peak of first peak；
Second computation subunit, the summit height for the summit height when the second peak greater than first peak, and the second peak The lowest point height is less than the lowest point height of first peak；Or second the summit height at peak be less than the summit height of first peak, and second The lowest point height at peak is greater than the lowest point height of first peak, calculates between the summit height at the second peak and the lowest point height at the second peak Difference, obtain the relative peak at the second peak, and calculate the difference between the summit height of first peak and the lowest point height of first peak Value, obtains the relative peak of first peak.
Feature Selection module 14, for being screened to relative peak, using the relative peak and peak position filtered out, Obtain the testing result of cable to be measured；
Wherein, which includes one among the position of the length of cable to be measured, terminal state and incipient fault Or multiple combinations, it can specifically be determined according to actually detected demand.
Optionally, as shown in figure 13, this feature screening module 14 may include:
Sequencing unit 141, for the size according to relative peak, each peak corresponding to relative peak is ranked up；
Multipath reflection position calculation unit 142, for the peak corresponding peak forward using the peak position and sequence of working as leading peak Position calculates the multipath reflection position generated when leading peak and the forward peak that sorts；
Authentication unit 143, for verifying whether the relative peak at multipath reflection position is greater than threshold value；
Crest height adjustment unit door 144 is when being, to reduce multipath reflection position for the verification result in authentication unit Set the relative peak at place；
Relative peak screening unit 145, the relative peak for being greater than threshold value for screening the relative peak after reducing.
In another alternative embodiment of the present invention, as shown in figure 13, this feature screening module 14 can also include:
Length of cable computing unit 146, the corresponding peak position of highest relative peak for will filter out are determined as detecting Starting point, the corresponding peak position of the last one relative peak filtered out is determined as detecting terminal, and calculates detection terminal and detection Alternate position spike between starting point obtains the length of cable to be measured；And/or
Cable terminal state determination unit 147, for based on the corresponding peak position of the last one relative peak filtered out The prediction residual at place determines the state of the detection terminal of cable to be measured；And/or
Incipient fault determination unit 148, for detecting starting point and detecting the relative peak for existing between terminal and filtering out, Determining cable to be measured, there are incipient faults, and determine the position of incipient fault.
The embodiment of the invention also provides a kind of electronic equipment, including processor and memory；Wherein:
Memory is for storing computer instruction；
Processor is used to execute the computer instruction of the memory storage, specifically executes above-mentioned cable detection Each step of method.Specific implementation process is referred to the description of above method embodiment corresponding portion.
In the present embodiment practical application, which can also be used to store the reflectance data of the cable to be measured of acquisition, The testing result of cable under test, and reflectance data is handled to obtain intermediate data of testing result etc., it can basis Actual needs determines.Memory may include the non-volatile memory in computer-readable medium, random access memory (RAM) and/or the forms such as Nonvolatile memory, such as read-only memory (ROM) or flash memory (flash RAM), memory includes extremely A few storage chip.
The embodiment of the invention also provides a kind of cable detection device, the system structure referring to shown in figure 3 above a and Fig. 3 b Schematic diagram, the wireline inspection equipment can be cable detector or cable detector and sets with what computer equipment was composed Standby etc., which is not limited by the present invention.The hardware structural diagram of cable detection device as shown in figure 14, cable detection Equipment may include:
Signal transmitting and receiving circuit 21 is used for cable transmission pumping signal to be measured, and acquires the reflectance data of cable to be measured；
The present invention to the particular circuit configurations of signal transmitting and receiving circuit without limitation, and to how swashing to cable transmission to be measured Signal is encouraged, the detailed process for how acquiring reflectance data is not detailed.
Memory 22, for storing the computer program for realizing above-mentioned cable detection method；
Processor 23 realizes above-mentioned cable detection method for loading and executing the computer program of memory storage Each step.
Optionally, the hardware configuration of cable detection device provided by the invention is not limited to several parts listed above, It can also include various conciliation buttons, display etc., can need to be arranged or extend according to detection, the present invention is not one by one It is described in detail.
Finally, it should be noted that about in the various embodiments described above, such as first, second or the like relational terms are only Only it is used to distinguish an operation or unit with another operation or unit, without necessarily requiring or implying these lists There are any actual relationship or orders between member or operation.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with its The difference of his embodiment, the same or similar parts in each embodiment may refer to each other.For being filled disclosed in embodiment It sets, for electronic equipment, equipment, since it is corresponding with method disclosed in embodiment, so be described relatively simple, correlation Place is referring to method part illustration.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, defined herein General Principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, originally Invention is not intended to be limited to the embodiments shown herein, and is to fit to special with principles disclosed herein and novelty The consistent widest scope of point.

Claims (10)

1. a kind of cable detection method, which is characterized in that the described method includes:
Obtain the reflectance data of cable to be measured；
Tracking filter is carried out to the reflectance data, obtains the prediction residual of the cable to be measured；
Opposite blob detection is carried out to the prediction residual, obtains relative peak and the peak position at each peak；
The relative peak is screened, using the relative peak and the peak position filtered out, is obtained described to be measured The testing result of cable, the testing result include the length of the cable to be measured, terminal state and incipient fault position it In one or more combinations.
2. being obtained the method according to claim 1, wherein described carry out opposite blob detection to the prediction residual Relative peak and peak position to each peak, comprising:
The prediction residual is normalized, prediction residual sequence is obtained；
From the prediction residual sequence, the summit height, the lowest point height and the peak position at each peak are obtained；
Summit height, the lowest point height according to each peak carry out relative peak calculating, obtain the phase at each peak To peak value.
3. according to the method described in claim 2, obtaining each peak it is characterized in that, described from the prediction residual sequence Summit height, the lowest point height and the peak position, comprising:
Screen the maximum and minimum in the prediction residual sequence；
The maximum is determined as the summit height when leading peak, the corresponding position of the maximum is determined as described work as The peak position of leading peak；
The lesser minimum adjacent with the maximum is determined as the lowest point height for working as leading peak；
Summit height, the lowest point height according to each peak carries out relative peak calculating, obtains the institute at each peak State relative peak, comprising:
The summit height and the lowest point height at two adjacent peaks are compared respectively；
Based on comparative result, the relative peak at two adjacent peaks is calculated.
4. according to the method described in claim 3, it is characterized in that, two adjacent peaks are denoted as first peak and respectively Two peaks, and the first peak is generated earlier than second peak；It is described based on comparative result, calculate the institute at two adjacent peaks State relative peak, comprising:
If the summit height at second peak is greater than the summit height of the first peak, and the institute at second peak State the lowest point height that the lowest point height is greater than the first peak；Alternatively, the summit height at second peak is less than described The summit height of first peak, and the lowest point height at second peak is less than the lowest point height of the first peak, The difference between the summit height at second peak and the lowest point height of the first peak is calculated, obtains described second The relative peak at peak, and calculate between the summit height of the first peak and the lowest point height at second peak Difference, obtain the relative peak of the first peak；
If the summit height at second peak is greater than the summit height of the first peak, and the institute at second peak State the lowest point height that the lowest point height is less than the first peak；Alternatively, the summit height at second peak is less than described The summit height of first peak, and the lowest point height at second peak is greater than the lowest point height of the first peak, The difference between the summit height at second peak and the lowest point height at second peak is calculated, obtains described second The relative peak at peak, and calculate between the summit height of the first peak and the lowest point height of the first peak Difference, obtain the relative peak of the first peak.
5. method described in any one according to claim 1~4, which is characterized in that described to be sieved to the relative peak Choosing, comprising:
According to the size of the relative peak, each peak corresponding to the relative peak is ranked up；
Using when the peak position and the forward corresponding peak position in peak of sequence of leading peak, calculate it is described when leading peak with it is described The multipath reflection position that the peak for sorting forward generates；
Verify whether the relative peak at the multipath reflection position is greater than threshold value；
If so, reducing the relative peak at the multipath reflection position；
Screening is greater than the relative peak of the threshold value.
6. according to the method described in claim 5, it is characterized in that, the relative peak and the peak that the utilization filters out Position obtains the testing result of the cable to be measured, comprising:
The corresponding peak position of relative peak described in the highest filtered out is determined as to detect starting point, by last filtered out The corresponding peak position of a relative peak is determined as detecting terminal, and calculates the detection terminal and the detection starting point Between alternate position spike, obtain the length of the cable to be measured；And/or
Based on the prediction residual of the detection terminal point, the state of the detection terminal is determined；And/or
If there is the relative peak filtered out between the detection starting point and the detection terminal, determine it is described to There are incipient faults for survey line cable, and determine the position of the incipient fault.
7. a kind of cable detecting device, which is characterized in that described device includes:
Data acquisition module, for obtaining the reflectance data of cable to be measured；
Filtering module is tracked, for carrying out tracking filter to the reflectance data, obtains the prediction residual of the cable to be measured；
Opposite blob detection module obtains the relative peak and peak at each peak for carrying out opposite blob detection to the prediction residual Position；
Feature Selection module utilizes the relative peak and the peak filtered out for screening to the relative peak Position obtains the testing result of the cable to be measured.
8. device according to claim 7, which is characterized in that described to include: with respect to blob detection module
Normalized unit obtains prediction residual sequence for the prediction residual to be normalized；
Data acquiring unit obtains the summit height at each peak, the lowest point height and described for from the prediction residual sequence Peak position；
Relative peak computing unit carries out relative peak calculating for summit height, the lowest point height according to each peak, obtains To the relative peak at each peak.
9. device according to claim 7 or 8, which is characterized in that the Feature Selection module includes:
Sequencing unit, for the size according to the relative peak, each peak corresponding to the relative peak is ranked up；
Multipath reflection position calculation unit, for the peak corresponding peak forward using the peak position and sequence of working as leading peak Position calculates the multipath reflection position that the peak forward with the sequence when leading peak generates；
Authentication unit, for verifying whether the relative peak at the multipath reflection position is greater than threshold value；
Crest height adjustment unit is when being, to reduce the multipath reflection position for the verification result in the authentication unit The relative peak at place；
Relative peak screening unit, for screening the relative peak for being greater than the threshold value.
10. a kind of electronic equipment, including processor and memory；Wherein:
The memory is for storing computer instruction；
The processor is used to execute the computer instruction of the memory storage, specific to execute as in claim 1-6 Cable detection method described in any one.
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