CN109061386A - A kind of cable detection method and device - Google Patents
A kind of cable detection method and device Download PDFInfo
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- CN109061386A CN109061386A CN201810948282.6A CN201810948282A CN109061386A CN 109061386 A CN109061386 A CN 109061386A CN 201810948282 A CN201810948282 A CN 201810948282A CN 109061386 A CN109061386 A CN 109061386A
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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
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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 invention discloses a kind of cable detection method and device, method includes: to input echo signal to the first end of target cable, obtains the first shock response curve；After obtaining the first shock response curve, echo signal is inputted to the second end of target cable, obtains the second shock response curve；Registration process is carried out according to curvilinear abscissa to the first shock response curve and the second shock response curve, obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve；Based on corresponding first shock response curve of curvilinear abscissa and the second shock response curve, the cable shock response curve of target cable is generated；Based on cable shock response curve, the cable impedance curve of target cable is obtained.
Description
Technical field
The present invention relates to cable detection technique field, in particular to a kind of cable detection method and device.
Background technique
In the detection of train bus-line, in order to determine the connection status situation of cable and connector, need to analyze sliver
Characteristic impedance at each position of cable.As in existing time domain change detection scheme, test cable is at respective frequencies first
Return loss value, i.e. S11 parameter: the ratio between the 1 port incidence wave and 1 port back wave of cable, and then obtain these times
It dials loss value and is formed by S11 curve, the S11 curve of frequency domain is then subjected to inverse Fourier transform, the impact for obtaining time domain is rung
Curve is answered, since there are certain relationships with impedance for the shock response of cable, cable is obtained by shock response curve
Impedance conversion curve.
It, can be because there is cable remote signaling energy seldom and noise in cable when longer but in above-mentioned cable detection scheme
Thus relatively low situation can be difficult to realize accurate cable detection.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of cable detection method and device, to solve the prior art
In be difficult to realize accurate cable detection the technical issues of.
The present invention provides a kind of cable detection methods, which comprises
Echo signal is inputted to the first end of target cable, obtains the first shock response curve；
After obtaining first shock response curve, the target is inputted to the second end of the target cable and is believed
Number, obtain the second shock response curve；
First shock response curve and second shock response curve are carried out at alignment according to curvilinear abscissa
Reason, obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve；
Based on corresponding first shock response curve of the curvilinear abscissa and the second shock response curve, described in generation
The cable shock response curve of target cable；
Based on the cable shock response curve, the cable impedance curve of the target cable is obtained.
The above method, it is preferred that first shock response curve and second shock response curve according to curve
Abscissa carries out registration process, obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve,
Include:
Abscissa is based on to any one curve in first shock response curve and second shock response curve
Reverse process is carried out, abscissa the first shock response curve and the second shock response curve in the same direction are obtained；
Determine the abscissa the first shock response curve in the same direction and the second shock response curve on curvilinear abscissa
Offset；
Based on the offset, to the abscissa the first shock response curve in the same direction and the second shock response curve into
Line misregistration Processing for removing obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve.
The above method, it is preferred that determine that the abscissa the first shock response curve in the same direction and the second shock response are bent
Offset of the line on curvilinear abscissa, comprising:
Obtain the cross-correlation function of the abscissa the first shock response curve in the same direction and the second shock response curve；
Based on the cross-correlation function, the abscissa the first shock response curve in the same direction and the second shock response are determined
Offset of the curve on curvilinear abscissa.
The above method, it is preferred that based on corresponding first shock response curve of the curvilinear abscissa and the second impact
Response curve generates the cable shock response curve, comprising:
On the basis of curvilinear abscissa, merge corresponding first shock response curve of the curvilinear abscissa and the second punching
Response curve is hit, the cable shock response curve is obtained.
The above method, it is preferred that on the basis of curvilinear abscissa, merge corresponding first impact of the curvilinear abscissa
Response curve and the second shock response curve obtain the cable shock response curve, comprising:
Take the abscissa in corresponding first shock response curve of the curvilinear abscissa and the second shock response curve
For the abscissa of the cable shock response curve；
In corresponding first shock response curve of the curvilinear abscissa and the second shock response curve, same cross is taken
The corresponding maximum ordinate value of coordinate is the corresponding ordinate value of corresponding abscissa in the cable shock response curve.
The present invention also provides a kind of cable detecting device, described device includes:
First detection structure inputs echo signal for the first end to target cable, obtains the first shock response curve；
Second detection structure, for after first detection structure obtains first shock response curve, to institute
The second end for stating target cable inputs the echo signal, obtains the second shock response curve；
Processor is used for first shock response curve and second shock response curve according to curvilinear abscissa
Registration process is carried out, corresponding first shock response curve of curvilinear abscissa and the second shock response curve are obtained；Based on institute
Corresponding first shock response curve of curvilinear abscissa and the second shock response curve are stated, the cable of the target cable is generated
Shock response curve；Based on the cable shock response curve, the cable impedance curve of the target cable is obtained.
Above-mentioned apparatus, it is preferred that the processor is specifically used for:
Abscissa is based on to any one curve in first shock response curve and second shock response curve
Reverse process is carried out, abscissa the first shock response curve and the second shock response curve in the same direction are obtained；Determine the horizontal seat
The offset of mark the first shock response curve and the second shock response curve in the same direction on curvilinear abscissa；Based on the offset
Amount carries out dislocation Processing for removing to the abscissa the first shock response curve in the same direction and the second shock response curve, obtains
Corresponding first shock response curve of curvilinear abscissa and the second shock response curve.
Above-mentioned apparatus, it is preferred that the processor is specifically used for:
Obtain the cross-correlation letter of the abscissa the first shock response curve in the same direction and second shock response curve
Number；Based on the cross-correlation function, the abscissa the first shock response curve and the second shock response curve in the same direction are determined
Offset on curvilinear abscissa.
Above-mentioned apparatus, it is preferred that the processor is specifically used for:
On the basis of curvilinear abscissa, merge corresponding first shock response curve of the curvilinear abscissa and the second punching
Response curve is hit, the cable shock response curve is obtained.
Above-mentioned apparatus, it is preferred that the processor obtains the cable shock response curve of the target cable, specifically:
Take the abscissa in corresponding first shock response curve of the curvilinear abscissa and the second shock response curve
For the abscissa of the cable shock response curve；In corresponding first shock response curve of the curvilinear abscissa and second
In shock response curve, it is corresponding horizontal in the cable shock response curve for taking the corresponding maximum ordinate value of same abscissa
The corresponding ordinate value of coordinate.
As it can be seen from the above scheme a kind of cable detection method and device provided by the invention, by successive to cable both ends
Input signal obtains the respective shock response curve in both ends, and after being aligned to two shock response curves about abscissa,
The cable shock response curve of cable is generated based on the corresponding shock response curve of the two abscissas, at this point, the cable rushes
The obtained curve of shock response curve that response curve is combined with both ends test is hit, it is thus obtained compared to unilateral test
Shock response curve can significantly improve the accuracy for the impedance behavior that curve is reflected, and then based on accessed by this curve
Cable impedance curve can more accurately show the impedance behavior of cable, to realize the accurate detection to cable.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of implementation flow chart for cable detection method that the embodiment of the present invention one provides；
Fig. 2~Fig. 7 is respectively the application exemplary diagram of the embodiment of the present invention；
Fig. 8 is the partial process view of the embodiment of the present invention one；
Fig. 9~Figure 12 is respectively the another application exemplary diagram of the embodiment of the present invention；
Figure 13 is another part flow chart of the embodiment of the present invention one；
Figure 14 is that the another of the embodiment of the present invention applies exemplary diagram；
Figure 15 is a kind of structural schematic diagram of cable detecting device provided by Embodiment 2 of the present invention；
Figure 16~Figure 17 is respectively the other application exemplary diagram of the embodiment of the present invention.
Specific embodiment
Specifically, following will be combined with the drawings in the embodiments of the present invention, technical solution in the embodiment of the present invention is carried out
It clearly and completely describes, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
With reference to Fig. 1, for a kind of implementation flow chart for cable detection method that the embodiment of the present invention one provides, this method can be with
It applies in the target cable for needing to carry out testing impedance, such as the detection of wired train bus WTB (Wire Train Bus)
In, by detecting and analyzing the characteristic impedance at each position of whole cable, to determine the connection status of cable and connector
Situation.
In the present embodiment, this method may comprise steps of:
Step 101: echo signal being inputted to the first end of target cable, obtains the first shock response curve.
Step 102: echo signal being inputted to the second end of target cable, obtains the second shock response curve.
Wherein, echo signal can be the sine wave of energy constant.
Specifically, the echo signal of multiple frequencies can be sequentially inputted to mesh respectively first in the present embodiment step 101
The first end of graticule cable, as by since frequency 10kHz to frequency 500MHz corresponding to certain frequency interval
Sine wave signal namely echo signal are sequentially inputted to the first end of target cable, under the echo signal for acquiring each frequency
Thus the waveform of incidence wave and back wave calculates the first shock response curve of 10kHz to 500MHz；Later, in step 102
Same echo signal is sequentially inputted to the second end of target cable again, under the echo signal for acquiring each frequency as a result,
The waveform of incidence wave and back wave correspondingly calculates the second shock response curve.
As shown in Figure 2, to the successive input sine wave signal in target cable both ends in train, wherein include in train
Two locomotive heads: locomotive 1 and locomotive 2 and N number of carriage, train have score to locomotive 2 again from locomotive 1 to carriage N
Cable, specific:
In the present embodiment can first in target cable 1 side of locomotive cable port input 10kHz-500MHz frequency
Sine wave signal indicated so that measurement obtains the ratio curve of back wave and incident wave energy with S11_A, to ratio song
Line S11_A does inverse Fourier transform, obtains the first shock response curve A of time domain, wherein measurement frequency f range is 10kHz-
500MHz, frequency interval Δ f=50kHz, it may be assumed that since frequency f is 10kHz, take one every separation values Δ f=50kHz
The sine wave signal is inputted cable port by the corresponding sine wave signal of secondary frequencies value, corresponding for 500MHz until obtaining frequency f
Sine wave signal, and by the sine wave signal input cable port, S11_A is obtained, when obtaining after inverse Fourier transform
The first shock response curve A in domain, and passing through the transformed first shock response curve A of time domain is discrete curve, time model
Enclose 0-1/ Δ f=2 × 10-5S, time interval Δ t=1/f=2 × 10-9S, corresponding cable overall length are X, and length resolution can
Think 0.12m, as shown in Figure 3；
Later, 10kHz-500MHz frequency is inputted to the cable port of 2 side of locomotive in target cable again in the present embodiment
Sine wave signal indicated so that measurement obtains the ratio curve of back wave and incident wave energy with S11_B, to ratio song
Line S11_B does inverse Fourier transform, obtains the second shock response curve B of time domain, wherein measurement frequency f range is 10kHz-
500MHz, separation values Δ f=50kHz, it may be assumed that since frequency f is 10kHz, taken every separation values Δ f=50kHz
The sine wave signal is inputted cable port by the corresponding sine wave signal of frequency values, is 500MHz pairs until obtaining frequency f
The sine wave signal answered, and the sine wave signal is inputted into cable port, S11_B is obtained, is obtained after inverse Fourier transform
Second shock response curve B of time domain, and passing through the transformed second shock response curve B of time domain is discrete curve, time
Range 0-1/ Δ f=2 × 10-5S, time interval Δ t=1/f=2 × 10-9S, corresponding cable overall length are X, length resolution
It can be 0.12m, as shown in Figure 4.
In addition, can be incited somebody to action in the present embodiment after obtaining the first shock response curve A and the second shock response curve B
The time change of abscissa is converted to apart from variable in curve, so that it is bent to obtain the shock response of target cable at different distances
Line, as shwon in Figures 5 and 6.
It should be noted that detection structure can be arranged at target cable both ends respectively in the present embodiment and input target letter
Number and obtain impacting response curve accordingly.For example, in locomotive shown in Fig. 2, in 1 side of locomotive and 2 side of locomotive point
Not She Zhi a detection structure, the successive input sine wave signal of the detection structure at target cable both ends, to respectively obtain the first punching
Hit response curve A and the second shock response curve B.
Step 103: the first shock response curve and the second shock response curve are carried out at alignment according to curvilinear abscissa
Reason, obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve.
Wherein, the first shock response curve and the second shock response curve obtained in the present embodiment are respectively from target
The both ends of cable carry out detecting obtained shock response curve, thus on the horizontal scale corresponding variable be exactly it is opposite,
Therefore, it needs to be aligned the first shock response curve and the second shock response curve according to curvilinear abscissa in the present embodiment
Processing, so that corresponding first shock response curve of curvilinear abscissa and the second shock response curve are obtained, such as institute in Fig. 7
Show, corresponding position or distance are consistent abscissa on target cable since 0 between two curves.
Step 104: being based on corresponding first shock response curve of curvilinear abscissa and the second shock response curve, generate
The cable shock response curve of target cable.
Wherein, after curvilinear abscissa alignment, the first shock response curve is from wherein one end of target cable
It carries out testing obtained curve, and the second shock response curve is to carry out testing obtained song from the other end of target cable
Line, two curves are to pass through in the present embodiment as a result, on same abscissa to the measurement result on same cable same position
First shock response curve and the second shock response curve are synthesized, so that the cable shock response for generating target cable is bent
Line, and the cable shock response curve combines the test result that target cable both ends are tested respectively, so as to significantly improve
The accuracy of test result curve.
Step 105: being based on cable shock response curve, obtain the cable impedance curve of target cable.
It wherein, can be by carrying out Parameter Switch to cable shock response curve, to obtain target cable in the present embodiment
Cable impedance curve, to show the impedance operator on target cable corresponding position.
As it can be seen from the above scheme a kind of cable detection method that the embodiment of the present invention one provides, by cable both ends point
Other input signal obtains the respective shock response curve in both ends, and is being aligned it about abscissa to two shock response curves
Afterwards, the cable shock response curve that cable is generated based on the corresponding shock response curve of the two abscissas, at this point, the cable
Shock response curve is combined with the obtained curve of shock response curve of both ends test, thus compared to obtained by unilateral test
Shock response curve, the accuracy for the impedance behavior that curve is reflected can be significantly improved, and then ring based on the impact of this cable
Answer cable impedance curve accessed by curve that can more accurately show the impedance behavior of cable, to realize to cable
Accurate detection achievees the purpose that improve cable detection accuracy.
In one implementation, in the present embodiment to the first shock response curve and the second shock response curve according to
When curvilinear abscissa carries out registration process, can specifically it be accomplished by the following way, as shown in Figure 8:
Step 801: abscissa is based on to any one curve in the first shock response curve and the second shock response curve
Reverse process is carried out, to obtain abscissa the first shock response curve and the second shock response curve in the same direction.
Specifically, determining vertex 0 of the wherein one end as abscissa in target cable in the present embodiment, impacted to first
Abscissa vertex is that the curve of the other end in target cable carries out reverse process in response curve and the second shock response curve.
For example, 1 one end of locomotive in the present embodiment in determining target cable is as abscissa by taking cable in Fig. 2 as an example
Vertex 0 carries out the curve that abscissa vertex in the first shock response curve A and the second shock response curve B is 2 one end of locomotive
Reverse process.
Wherein, the first shock response curve A and the second shock response curve B is to be tested respectively from target cable both ends
It is obtained that as a result, the abscissa starting point of i.e. the first shock response curve A is cable head end, terminal is cable ends, second
The abscissa starting point of shock response curve B is cable ends, and terminal is cable head end, therefore, by the second shock response curve B
After carrying out reversely, it is also the end since cable head end that obtained the second new shock response curve B abscissa, which can consider,
Terminate, i.e., the first shock response curve A at this time and the second shock response curve B indicate the characteristic that cable the same end starts, such as Fig. 9
Shown in, at this point, the first shock response curve A and the second shock response curve B are in the same direction about abscissa.
Step 802: determining abscissa the first shock response curve in the same direction and the second shock response curve in the horizontal seat of curve
The offset put on.
Wherein, abscissa the first shock response curve and the second shock response curve equal table on curve ordinate in the same direction
Levy the impedance behavior of corresponding position on cable, and two curves corresponded on curvilinear abscissa target cable apart from head end away from
From i.e. position on target cable, if ignoring the factor of signal decaying, two curves are answered on the position of same distance
This shows as identical characteristic, i.e. the peak value abscissa of shock response should be identical.But due to factors such as measurement errors, first
There may be certain " dislocation " on the horizontal scale between shock response curve A and the second shock response curve B, such as institute in Figure 10
Show, therefore, in the present embodiment it needs to be determined that in the horizontal seat of curve between the first shock response curve A and the second shock response curve B
The offset put on, i.e., the amount " to misplace ".
For example, it is assumed that the first shock response curve A is Y1 (x), the second shock response curve B is Y2 (x), abscissa x table
Show the point at target cable different length, theoretically, Y1 and Y2 it is corresponding on same abscissa be same on target cable
One point, but since due to measurement error etc., same abscissa may correspond to cable in two curves in actual measurement
On different location, i.e. there are certain offsets in abscissa direction for two curves.If using Y1 as standard, it is believed that Y1 and target
Cable is accurate corresponding, then Y2 is the presence of offset, at this time if directly being merged this two curves, finally
There can be error, it is inaccurate to lead to testing result, for this purpose, being determined in the present embodiment after obtaining two shock response curves
Offset of two curves on curvilinear abscissa.
In the concrete realization, two curves can be determined by calculating the cross-correlation function of two curves in the present embodiment
Offset on the horizontal scale.
Step 803: based on offset, first shock response curve in the same direction to abscissa and the second shock response curve into
Line misregistration Processing for removing obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve.
Wherein, any curve carries out reversely in the first shock response curve and the second shock response curve in the present embodiment
After processing obtains two in the same direction curves of abscissa, it can be subject to the first shock response curve, by the second shock response song
Line moves the value of offset on the horizontal scale, so that the second shock response curve and the first shock response curve are in the horizontal seat of curve
Put on it is corresponding, as shown in Figure 11.
Alternatively, in the present embodiment the second shock response curve can be subject in two in the same direction curves of abscissa, it will
First shock response curve moves the value of offset on the horizontal scale, so that the first shock response curve and the second shock response
Curve is corresponding on curvilinear abscissa, as shown in Figure 12.
Alternatively, can be by the first shock response curve and second shock response curve simultaneously in horizontal seat in the present embodiment
It puts on and moves certain value, and the amount adduction that two curves move on the horizontal scale is consistent with the value of offset, so that first
Shock response curve and the second shock response curve are corresponding on curvilinear abscissa.
In a kind of mode, the present embodiment is determining abscissa the first shock response curve in the same direction and the second shock response
Curve can specifically be accomplished by the following way in the offset on curvilinear abscissa, as shown in Figure 13:
Step 1301: obtaining the cross-correlation letter of abscissa the first shock response curve in the same direction and the second shock response curve
Number.
Wherein, it is bent that the impact of the first shock response curve Y1 and second can be characterized in the present embodiment with following formula (1)
Cross-correlation function between line Y2, the cross-correlation function are used to characterize the correlation between two curves:
R (m)=Σ Y1 (x) * Y2 (x+m) formula (1)
Wherein, m is the first shock response curve Y1 (x) and the offset of the second shock response curve Y2 (x) on the horizontal scale
Amount, relevance values of the R (m) between Y1 (x) and Y2 (x), the meaning of above formula are: by the second shock response curve Y2
(x) after the distance for deviating m, the product in two curve corresponding points is then calculated, then sum, and final relevance values R (m) is more
Greatly, indicate that the correlation of two curves when offset m is bigger.In the present embodiment, what Y1 and Y2 was indicated is same target cable
Characteristic, although attenuation trend is different, correlation with higher, particularly, when the whole offset for being equal to Y2 well of m, this
When Y1 and Y2 just correspond to the same position of cable, correlation highest at this time.
Step 1302: being based on cross-correlation function, determine that abscissa the first shock response curve in the same direction and the second impact are rung
Answer offset of the curve on curvilinear abscissa.
Offset of the Y2 relative to Y1 on the horizontal scale is calculated, such as using the above cross-correlation function based on the above analysis
Under:
Firstly, the value range of setting m, such as -60 meters to 60 meters, or such as -200 meters to 200 meters, wherein in order to reduce meter
Calculation amount, can be according to historical data such as Y2 offset usually within 30 meters, then the transformed value range of setting m in the present embodiment
It is positive and negative 30 meters, and then calculates Y1 and Y2 each cross-correlation function R (m) value corresponding within the scope of the value of m；
Later, the maximum value in m each cross-correlation function R (m) value corresponding within the scope of its value is found, determines the maximum
Value corresponding offset M, the M are offset of the Y2 relative to Y1, and M is one of value in the value range of m.
Finally, in the present embodiment after calculating Y2 relative to the offset of Y1, it is based on offset, the first impact is rung
It answers curve and the second shock response curve to carry out dislocation Processing for removing, such as replaces Y2 (x) with Y2 (x+M), obtain curvilinear abscissa
Corresponding first shock response curve and the second shock response curve.
In another implementation, the present embodiment can also calculate Y1 relative to Y2 in horizontal seat based on the above numerical procedure
The offset put on, then it is based on offset, the first shock response curve and the second shock response curve are carried out at dislocation elimination
Reason such as replaces Y1 (x) with Y1 (x+M), obtains corresponding first shock response curve of curvilinear abscissa and the second shock response
Curve.
In one implementation, the present embodiment is based on the corresponding first impact sound of curvilinear abscissa in step 103
Curve and the second shock response curve are answered, it, specifically can be by with lower section when generating the cable shock response curve of target cable
Formula is realized:
It is subject to curvilinear abscissa, merges corresponding first shock response curve of curvilinear abscissa and the second shock response
Curve obtains the cable shock response curve of target cable.
Specifically, can be rung in corresponding first shock response curve of curvilinear abscissa and the second impact in the present embodiment
It answers in curve, taking the abscissa in corresponding first shock response curve of curvilinear abscissa and the second shock response curve is mesh
The abscissa of the cable shock response curve of graticule cable, and in corresponding first shock response curve of curvilinear abscissa and second
In shock response curve, taking the corresponding maximum ordinate value of same abscissa is corresponding abscissa in cable shock response curve
Corresponding ordinate value.
For example, the above first shock response curve A and the second shock response curve B are put together, takes and indulge seat in the two
Mark the best part forms new curve, using the new curve as final cable shock response curve, as shown in figure 14.The
One shock response curve A and the second shock response curve B is to carry out testing obtained test knot from target cable both ends respectively
Fruit, since the distance of distance signal input position is different, caused ordinate value decaying is different, takes in the present embodiment as a result,
The two ordinate the best part forms cable shock response curve, to eliminated to a certain extent since target cable is too long
Caused by decay it is larger, and there is a situation where detection inaccuracy, thus improve detection accuracy.
It is a kind of structural schematic diagram of cable detecting device provided by Embodiment 2 of the present invention with reference to Figure 15, the device is suitable
In target cable for needing to carry out testing impedance, as wired train bus (WTB) detection in, by detecting and analyzing
Characteristic impedance at each position of whole cable out, to determine the connection status situation of cable and connector.
In the present embodiment, the apparatus may include with flowering structure:
First detection structure 1501 inputs echo signal for the first end to target cable, obtains the first shock response
Curve.
Wherein, echo signal can be the sine wave of energy constant.
It, can respectively will be more specifically, the first end of target cable is arranged in the first detection structure 1501 in the present embodiment
The echo signal of a frequency is sequentially inputted to the first end of target cable, such as will since frequency 10kHz to frequency 500MHz it
Between sine wave signal namely echo signal corresponding to certain frequency interval, be sequentially inputted to the first of target cable
End, acquires the waveform of the incidence wave and back wave under the echo signal of each frequency, thus calculates the of 10kHz to 500MHz
One shock response curve.
Second detection structure 1502, for after the first detection structure 1501 obtains the first shock response curve, to mesh
The second end of graticule cable inputs echo signal, obtains the second shock response curve.
Wherein, the second end of target cable is arranged in the second detection structure 1502 in the present embodiment, can respectively will be multiple
The echo signal of frequency is sequentially inputted to the second end of target cable, to every frequency 500MHz such as since frequency 10kHz
The sine wave signal corresponding to certain frequency interval acquires incidence wave under the echo signal of each frequency and anti-as a result,
The waveform of ejected wave calculates the second shock response curve accordingly.
As shown in Figure 16, the first detection structure 1501 and 1502 pairs of the second detection structure column are utilized respectively in the present embodiment
The successive input sine wave signal in target cable both ends in vehicle, wherein it include two locomotive heads: locomotive 1 and locomotive 2 in train,
And N number of carriage, train have target cable to locomotive 2 again from locomotive 1 to carriage N.
Wherein, the first detection structure 1501 and the second detection structure 1502 can be to include that signal generator and signal receive
The cable detection device CDD of device, if 1 side of locomotive of target cable is arranged in the CDD1 in Figure 16, CDD2 is arranged in score
2 side of locomotive of cable.
It can be first with the first detection structure 1501 to the cable port of 1 side of locomotive in target cable in the present embodiment
The sine wave signal of 10kHz-500MHz frequency is inputted, so that measurement obtains the ratio curve of back wave and incident wave energy, with
S11_A is indicated, is done inverse Fourier transform to ratio curve S11_A, is obtained the first shock response curve A of time domain, wherein is surveyed
Amount frequency f range is 10kHz-500MHz, frequency interval Δ f=50kHz, it may be assumed that since frequency f is 10kHz, every between frequency
The corresponding sine wave signal of a frequency values is taken every value Δ f=50kHz, which is inputted into cable port, Zhi Daoqu
Obtaining frequency f is the corresponding sine wave signal of 500MHz, and the sine wave signal is inputted cable port, S11_A is obtained, by inverse
The first shock response curve A of time domain is obtained after Fourier transformation, and is by the transformed first shock response curve A of time domain
Discrete curve, time range 0-1/ Δ f=2 × 10-5S, time interval Δ t=1/f=2 × 10-9S, corresponding cable overall length
For X, length resolution can be 0.12m, as shown in Figure 3；
Later, recycle the second detection structure 1502 to the cable port of 2 side of locomotive in target cable in the present embodiment
The sine wave signal of 10k-500MHz frequency is inputted, so that measurement obtains the ratio curve of back wave and incident wave energy, with
S11_B is indicated, is done inverse Fourier transform to ratio curve S11_B, is obtained the second shock response curve B of time domain, wherein is surveyed
Amount frequency f range is 10kHz-500MHz, separation values Δ f=50kHz, it may be assumed that since frequency f is 10kHz, every frequency
Spacing value Δ f=50kHz takes the corresponding sine wave signal of a frequency values, which is inputted cable port, until
Acquirement frequency f is the corresponding sine wave signal of 500MHz, and the sine wave signal is inputted cable port, obtains S11_B, is passed through
The second shock response curve B of time domain is obtained after inverse Fourier transform, and passes through the transformed second shock response curve B of time domain
For discrete curve, time range 0-1/ Δ f=2 × 10-5S, time interval Δ t=1/f=2 × 10-9S, corresponding cable are total
A length of X, length resolution can be 0.12m, as shown in Figure 4.
It, can will be bent in addition, in the present embodiment after obtaining the first shock response curve and the second shock response curve
The time change of abscissa is converted to apart from variable in line, so that it is bent to obtain the shock response of target cable at different distances
Line, as shwon in Figures 5 and 6.
Processor 1503, for being carried out to the first shock response curve and the second shock response curve according to curvilinear abscissa
Registration process obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve；Based on curve cross
Corresponding first shock response curve of coordinate and the second shock response curve, the cable shock response for generating target cable are bent
Line；Based on cable shock response curve, the cable impedance curve of target cable is obtained.
Wherein, the first shock response curve and the second shock response curve obtained in the present embodiment are respectively from target
The both ends of cable carry out detecting obtained shock response curve, thus on the horizontal scale corresponding variable be exactly it is opposite,
Therefore, processor 1503 is needed to the first shock response curve and the second shock response curve according to the horizontal seat of curve in the present embodiment
Mark carries out registration process, so that corresponding first shock response curve of curvilinear abscissa and the second shock response curve are obtained,
As shown in Figure 7, corresponding position or distance are consistent abscissa on target cable since 0 between two curves.
And after curvilinear abscissa alignment, the first shock response curve is carried out from wherein one end of target cable
Obtained curve is tested, and the second shock response curve is to carry out testing obtained curve from the other end of target cable,
Two curves are the processor in the present embodiment as a result, to the measurement result on same cable same position on same abscissa
1503 by synthesizing the first shock response curve and the second shock response curve, to generate the cable punching of target cable
Response curve is hit, and the cable shock response curve combines the test result that target cable both ends are tested respectively, so as to
Significantly improve the accuracy of test result curve.
Wherein, processor 1503 can be set in the first detection structure 1501, also can be set in the second detection structure
In 1502.
As it can be seen from the above scheme a kind of cable detecting device provided by Embodiment 2 of the present invention, by cable both ends point
Other input signal obtains the respective shock response curve in both ends, and is being aligned it about abscissa to two shock response curves
Afterwards, the cable shock response curve that cable is generated based on the corresponding shock response curve of the two abscissas, at this point, the cable
Shock response curve is combined with the obtained curve of shock response curve of both ends test, thus compared to obtained by unilateral test
Shock response curve, the accuracy for the impedance behavior that curve is reflected can be significantly improved, and then ring based on the impact of this cable
Answer cable impedance curve accessed by curve that can more accurately show the impedance behavior of cable, to realize to cable
Accurate detection achievees the purpose that the accuracy for improving cable detection.
In the concrete realization, processor 1503 to the first shock response curve and the second shock response curve according to curve
Abscissa carries out registration process, can specifically be accomplished by the following way:
Abscissa is based on to any one curve in the first shock response curve and the second shock response curve to carry out reversely
Processing, to obtain abscissa the first shock response curve and the second shock response curve in the same direction；Determine that abscissa is in the same direction
The offset of first shock response curve and the second shock response curve on curvilinear abscissa；Based on offset, to abscissa
First shock response curve and the second shock response curve in the same direction carries out dislocation Processing for removing, and it is corresponding to obtain curvilinear abscissa
The first shock response curve and the second shock response curve.
Specifically, processor 1503 can obtain abscissa the first shock response curve in the same direction and the second shock response
The cross-correlation function of curve；Based on cross-correlation function, determine that abscissa the first shock response curve in the same direction and the second impact are rung
Answer offset of the curve on curvilinear abscissa.
In addition, processor 1503 is being based on corresponding first shock response curve of curvilinear abscissa and the second shock response
Curve when generating the cable shock response curve of target cable, can merge curvilinear abscissa phase on the basis of curvilinear abscissa
Corresponding first shock response curve and the second shock response curve obtain the cable shock response curve of target cable.
Specifically, processor 1503 can specifically merge two curves in the following manner, to obtain the line of target cable
Cable shock response curve:
Taking the abscissa in corresponding first shock response curve of curvilinear abscissa and the second shock response curve is mesh
The abscissa of the cable shock response curve of graticule cable；It is rushed in corresponding first shock response curve of curvilinear abscissa and second
It hits in response curve, taking the corresponding maximum ordinate value of same abscissa is corresponding abscissa pair in cable shock response curve
The ordinate value answered.
It should be noted that the specific implementation of processor 1503 can be with reference to hereinbefore corresponding contents, and will not be described here in detail.
The present embodiment is illustrated with train bus-line detection scheme shown in Figure 17 below:
Wherein, central control unit CCU (central control unit), can be used for the totality of each equipment in train
Control, man-machine interactive interface HMI (Human Machine Interface) can be used for the display screen of driver operation in train
And controller, and wired train bus WTB (Wire Train Bus) is cable to be measured, and cable detecting device CDD
(cable detection device), i.e., the cable detection device in this programme.Each installation one is needed at cable both ends to be measured
Cable detection device CDD1 and CDD2.When measurement, method described above is first pressed by equipment CDD1, measures 10kHz-500MHz
S11 parameter, obtain curve S11_A, herein measurement frequency range 0-f=500MHz, frequency interval Δ f=50kHz, through change
Change time range 0-T=1/ Δ f=2 × 10-5s of rear time-domain curve, time interval Δ t=1/f=2 × 10-9s is corresponding
Cable overall length is 1200m, length resolution 0.12m；After measurement, equipment CDD1 sends signal, equipment to equipment CDD2
CDD2 is measured with same method from the other end, obtains curve S11_B, and equipment CDD2 transfers data to equipment after the completion
CDD1, equipment CDD1 are handled by data of the algorithm to two equipment, obtain final result.Entire measurement process is by two
A equipment, which automatically controls, to be carried out, and the switching for artificially controlling equipment is not needed.
According to above-mentioned measurement method, the S11 curve at cable both ends has been obtained.By handling this two curves, obtain
To final required cable shock response curve.Detailed process is as follows:
1, inverse Fourier transform is done to two S11 curves respectively, obtains the shock response curve of two time domains, and horizontal
Coordinate time is transformed into distance, obtains the shock response curve at cable different distance: the punching of the first shock response curve A and second
Hit response curve B；
2, A and B is to be measured from cable both ends respectively as a result, i.e. A abscissa starting point is cable head end, and terminal is cable
End；B abscissa starting point is cable ends, and terminal is cable head end.Therefore, the new song that after B progress reversely, will be obtained
It is also since cable head end that line abscissa, which can consider, and end terminates, i.e., A at this time and B indicate the spy that cable the same end starts
Property；
3, due to the measurement result that A and B are same cables, ignore the factor of signal decaying, two curves are in phase
Identical characteristic should be shown as at same distance, i.e. the peak value abscissa of shock response should be identical.But due to measurement error etc. because
Element, there may be certain " dislocation " for A and B abscissa, so needing the cross-correlation function by calculating two curves to determine
The size of abscissa " dislocation ", but after eliminate this " dislocation ", make two curves " alignment "；
4, finally, A, B abscissa are put together, the biggish part of ordinate in the two is taken to form new curve, by this
New curve is as final cable shock response curve.
In above-mentioned data handling procedure, the processing of step 3 is even more important.Assuming that A is indicated with Y1 (x), B is with Y2 (x)
It indicates, abscissa x indicates the point at cable different length.Theoretically, it is on cable that the same abscissa of Y1 and Y2 is corresponding
The same point, but in actual measurement due to measurement error etc., the same abscissa may correspond to cable in two curves
On different location, i.e., wherein there are certain offsets in abscissa direction for a curve.If using curve Y1 as standard, it is believed that
Y1 and cable are accurate corresponding, then curve Y2 has offset, at this time if directly merged with this two curves
Words, final result can also have error.Under our current Test Cycles, which is measured generally in 10-20 by experiment
Rice or so, and cable total length is usually 1200-1500m, therefore the error or obvious, can be right if not eliminating
Final result generates large effect.
In the data handling procedure of the present embodiment, the offset of curve Y2 is calculated by the cross-correlation function of Y1 and Y2
Amount.The correlation for being generally used to indicate two different curves of cross-correlation function, defined formula such as hereinbefore formula (1).
The meaning of above formula is then the distance of Y2 offset m is calculated separately the product of two curve corresponding points, then sum.
Final value R (m) is bigger, indicates that the correlation of two curves at this time is bigger.In our test data, what Y1 and Y2 were indicated
It is the characteristic of same cable, it, should correlation with higher although attenuation trend is different.Particularly, when m just etc.
When the offset of Y2, Y1 and Y2 just corresponds to the same position of cable at this time, and correlation should highest at this time.
According to the above analysis, the algorithm for calculating Y2 curve offset amount is as follows:
M calculates the cross-correlation function R (m) of Y1 and Y2 from -30 meters to 30 meter；
The maximum value of R (m) is calculated, determines m at this time；
Y2 (x) is replaced with Y2 (x+m).
At this time i.e. it is believed that the offset of Y2 has been eliminated, i.e. Y1 and Y2 correspond to the same position of cable.In general, Y2
Offset at 30 meters hereinafter, therefore the transformation range of m is set to positive and negative 30 meters.
Based on implementation above scheme, the detection scheme merged in the present embodiment using both-end, by active/standby devices respectively from line
Cable both ends are detected, and by the processing of the association at cable both ends, the detection of effective solution long range cable is asked
Topic, and improve cable detection length limit to 2000 meters away from preferable measurement effect can be obtained in cable detection long
More than, it can satisfy the testing requirements of existing train.
Further, the present embodiment, using the method for calculating cross-correlation function, eliminates in both-end fusion detection scheme
The offset for the curve that cable head end end measures respectively, improves the accuracy of obtained testing result.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of cable detection method and device provided by the present invention are described in detail above, to disclosed reality
The above description for applying example, enables those skilled in the art to implement or use the present invention.The a variety of of these embodiments are repaired
Changing will be readily apparent to those skilled in the art, and the general principles defined herein can not depart from
In the case where the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to this paper institute
These embodiments shown mutually are to fit to the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. a kind of cable detection method, which is characterized in that the described method includes:
Echo signal is inputted to the first end of target cable, obtains the first shock response curve；
After obtaining first shock response curve, the echo signal is inputted to the second end of the target cable, is obtained
To the second shock response curve；
Registration process is carried out according to curvilinear abscissa to first shock response curve and second shock response curve, is obtained
To corresponding first shock response curve of curvilinear abscissa and the second shock response curve；
Based on corresponding first shock response curve of the curvilinear abscissa and the second shock response curve, the target is generated
The cable shock response curve of cable；
Based on the cable shock response curve, the cable impedance curve of the target cable is obtained.
2. the method according to claim 1, wherein to first shock response curve and second impact
Response curve carries out registration process according to curvilinear abscissa, obtains corresponding first shock response curve of curvilinear abscissa and the
Two shock response curves, comprising:
Any one curve in first shock response curve and second shock response curve is carried out based on abscissa
Reverse process obtains abscissa the first shock response curve and the second shock response curve in the same direction；
Determine that the abscissa the first shock response curve in the same direction and the second shock response curve are inclined on curvilinear abscissa
Shifting amount；
Based on the offset, the abscissa the first shock response curve in the same direction and the second shock response curve are carried out wrong
Position Processing for removing, obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve.
3. according to the method described in claim 2, it is characterized in that, determining the abscissa the first shock response curve in the same direction
With offset of second shock response curve on curvilinear abscissa, comprising:
Obtain the cross-correlation function of the abscissa the first shock response curve in the same direction and the second shock response curve；
Based on the cross-correlation function, the abscissa the first shock response curve and the second shock response curve in the same direction are determined
Offset on curvilinear abscissa.
4. method according to claim 1 or 2, which is characterized in that based on corresponding first punching of the curvilinear abscissa
Response curve and the second shock response curve are hit, the cable shock response curve is generated, comprising:
On the basis of curvilinear abscissa, merges corresponding first shock response curve of the curvilinear abscissa and the second impact is rung
Curve is answered, the cable shock response curve is obtained.
5. according to the method described in claim 4, it is characterized in that, merging the horizontal seat of the curve on the basis of curvilinear abscissa
Corresponding first shock response curve and the second shock response curve are marked, the cable shock response curve is obtained, comprising:
Taking the abscissa in corresponding first shock response curve of the curvilinear abscissa and the second shock response curve is institute
State the abscissa of cable shock response curve；
In corresponding first shock response curve of the curvilinear abscissa and the second shock response curve, same abscissa is taken
Corresponding maximum ordinate value is the corresponding ordinate value of corresponding abscissa in the cable shock response curve.
6. a kind of cable detecting device, which is characterized in that described device includes:
First detection structure inputs echo signal for the first end to target cable, obtains the first shock response curve；
Second detection structure, for after first detection structure obtains first shock response curve, to the mesh
The second end of graticule cable inputs the echo signal, obtains the second shock response curve；
Processor, for being carried out to first shock response curve and second shock response curve according to curvilinear abscissa
Registration process obtains corresponding first shock response curve of curvilinear abscissa and the second shock response curve；Based on the song
Corresponding first shock response curve of line abscissa and the second shock response curve generate the cable impact of the target cable
Response curve；Based on the cable shock response curve, the cable impedance curve of the target cable is obtained.
7. device according to claim 6, which is characterized in that the processor is specifically used for:
Any one curve in first shock response curve and second shock response curve is carried out based on abscissa
Reverse process obtains abscissa the first shock response curve and the second shock response curve in the same direction；Determine that the abscissa is same
To offset on curvilinear abscissa of the first shock response curve and the second shock response curve；Based on the offset,
Dislocation Processing for removing is carried out to the abscissa the first shock response curve in the same direction and the second shock response curve, obtains curve
Corresponding first shock response curve of abscissa and the second shock response curve.
8. device according to claim 7, which is characterized in that the processor is specifically used for:
Obtain the cross-correlation function of the abscissa the first shock response curve in the same direction and second shock response curve；Base
In the cross-correlation function, determine the abscissa the first shock response curve in the same direction and the second shock response curve in curve
Offset on abscissa.
9. device according to claim 6 or 7, which is characterized in that the processor is specifically used for:
On the basis of curvilinear abscissa, merges corresponding first shock response curve of the curvilinear abscissa and the second impact is rung
Curve is answered, the cable shock response curve is obtained.
10. device according to claim 9, which is characterized in that the processor obtains the cable punching of the target cable
Response curve is hit, specifically:
Taking the abscissa in corresponding first shock response curve of the curvilinear abscissa and the second shock response curve is institute
State the abscissa of cable shock response curve；It is impacted in corresponding first shock response curve of the curvilinear abscissa and second
In response curve, taking the corresponding maximum ordinate value of same abscissa is corresponding abscissa in the cable shock response curve
Corresponding ordinate value.
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