CN104535814B - A kind of device and method for being used to correct the triggering shake of high-speed sampling oscillograph - Google Patents
A kind of device and method for being used to correct the triggering shake of high-speed sampling oscillograph Download PDFInfo
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- CN104535814B CN104535814B CN201410805384.4A CN201410805384A CN104535814B CN 104535814 B CN104535814 B CN 104535814B CN 201410805384 A CN201410805384 A CN 201410805384A CN 104535814 B CN104535814 B CN 104535814B
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Abstract
The present invention discloses a kind of device and method for being used to correct the triggering shake of high-speed sampling oscillograph, and the device includes signal source, for producing the first signal and secondary signal of synchronic base, the first input end of first signal output to sampling oscilloscope；Power splitter, for the secondary signal from signal source to be divided into reference signal and sampling oscilloscope trigger signal；90 ° of electric bridges, it is 90 ° of two-way orthogonal sine signal for the reference signal from power splitter to be divided into phase difference, and exports respectively to the second of sampling oscilloscope and the 3rd input；Data acquisition and processing unit, the two-way sinusoidal signal based on sampling oscilloscope calculates the triggering jitter value of the sampling oscilloscope, and the triggering jitter value to be calculated is modified to first signal.Technical scheme of the present invention have modified the triggering shake of sampling oscilloscope, improve the degree of accuracy of sampling oscilloscope measurement result.
Description
Technical field
The present invention relates to a kind of method for being used to correct triggering shake.It is used to correct more particularly, to one kind and takes at a high speed
The device and method of sample oscillograph triggering shake.
Background technology
In the test of communication system, the bit error rate is a good and bad important indicator of measurement system.And the shake of signal is
Cause one of major reason of error code, it is necessary to measure and analyze.High-speed sampling oscillograph is a kind of effective jitter measurement
With analysis tool, it is widely used in the test of data system.But in some the with a large bandwidth and at a high rate test of data system,
The shake that sampling oscilloscope itself introduces can cause large effect to measurement result, cause measurement result anti-well
Reflect the actual index of system.
Accordingly, it is desirable to provide a kind of device and method raising signal for being used to correct the triggering shake of high-speed sampling oscillograph is trembled
The degree of accuracy of dynamic measurement, the triggering shake to sampling oscilloscope are modified.
The content of the invention
It is an object of the invention to improve a kind of device and method for being used to correct the triggering shake of high-speed sampling oscillograph, solution
Certainly current high-speed sampling oscillograph to data system is tested with a large bandwidth and at a high rate when, itself introduce shake can to survey
Test result produces considerable influence so that test result has the problem of larger error.
To reach above-mentioned purpose, the present invention uses following technical proposals：
A kind of device for correcting sampling oscilloscope triggering shake, the described device include
Signal source, for producing the first signal and secondary signal of synchronic base, first signal output to sampling oscilloscope
First input end；
Power splitter, for the secondary signal from signal source to be divided into reference signal and sampling oscilloscope trigger signal；
90 ° of electric bridges, for the reference signal from power splitter to be divided into the two-way orthogonal sine signal that phase difference is 90 °,
And export respectively to the second of sampling oscilloscope and the 3rd input；
Data acquisition and processing unit, the two-way sinusoidal signal based on sampling oscilloscope calculate touching for the sampling oscilloscope
Jitter value is sent out, and the triggering jitter value to be calculated is modified to first signal.
Preferably, the described device further comprises
Bandpass filter, for being filtered to the reference signal from shown power splitter, and filtered signal is passed
Transport to 90 ° of electric bridges.
Preferably, it is described
Data acquisition and processing unit at least need to gather in gatherer process the two-way sinusoidal signal of a cycle to
Calculate the triggering jitter value of sampling oscilloscope.
A kind of method for correcting sampling oscilloscope triggering shake, described this method include
Measured signal is transmitted to sampling oscilloscope first input end；
Another way signal with the synchronic base of measured signal is divided into reference signal and trigger signal；
The reference signal is divided into the two-way orthogonal sine signal that phase difference is 90 °, is transmitted separately to sampling oscilloscope
Second and the 3rd input；
Sampling oscilloscope is adopted based on the trigger signal to the measured signal and the two-way orthogonal sine signal
Sample；
Data processing is carried out to the two-way orthogonal sine signal gathered and obtains the triggering jitter value of the sampling oscilloscope；
The measured signal gathered is modified based on the triggering jitter value.
Preferably, the reference signal is divided into the two-way orthogonal sine signal that phase difference is 90 ° after signal filters.
Preferably, it is described
Sampling oscilloscope at least needs to gather the two-way sinusoidal signal of a cycle in sampling process.
Preferably, the triggering jitter value for obtaining sampling oscilloscope comprises the following steps：
The two-way reference signal time shaft collected is alignd, and horizontal seat is used as using the range value of two-way reference signal respectively
Mark and ordinate are drawn, and obtain an ellipse；
By the way that elliptic transformation is obtained into the triggering jitter value into unit circle.
Preferably, the optimal solution drawn using quasi-Newton method by extreme value approximation computation is used as the triggering jitter value.
A kind of sampling oscilloscope for triggering shake and being corrected, the sampling oscilloscope include multiple inputs, the described sampling
Oscillograph further comprises：
First input end, for receiving the first signal from signal source；
Second input and the 3rd input, it is respectively used to receive the phase separated with the secondary signal of the synchronic base of the first signal
Potential difference is 90 ° of two-way orthogonal sine signal；
Data acquisition and processing module, the two-way sinusoidal signal based on sampling oscilloscope calculate touching for the sampling oscilloscope
Jitter value is sent out, and the triggering jitter value to be calculated is modified to first signal, obtains being corrected the sampling showing
First signal of the triggering jitter value of ripple device.
Beneficial effects of the present invention are as follows：
The triggering shake that technical scheme advantage of the present invention is to carry out high-speed sampling oscillograph based on orthogonal signalling is repaiied
Just, hence it is evident that improve the degree of accuracy of high-speed sampling oscilloscope measurement result, improve the measurement water to data system with a large bandwidth and at a high rate
It is flat.
Brief description of the drawings
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows a kind of structural representation for correcting high-speed sampling oscillograph triggering jittering device in the embodiment of the present invention；
Fig. 2 shows a kind of flow chart for correcting high-speed sampling oscillograph triggering dither method in the embodiment of the present invention；
Fig. 3 shows a kind of flow chart for obtaining high-speed sampling oscillograph triggering jitter value in the embodiment of the present invention；
Fig. 4 shows a kind of schematic diagram for obtaining high-speed sampling oscillograph triggering jitter value in the embodiment of the present invention.
Embodiment
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in figure 1, the invention discloses a kind of device for being used to correct the triggering shake of high-speed sampling oscillograph, the device
Including pattern generator 1, power splitter 2, bandpass filter 3,90 ° of electric bridges 4, sampling oscilloscope 5, computers 6.
Pattern generator 1 produces the two paths of signals with clear and definite phase relation, and will data-signal all the way, pass through tested letter
Number output terminals A 1 is transmitted to the passage one of sampling oscilloscope 5 to be modified, as measured signal through coaxial line；It will be total to data-signal
Shi Ji another way signal is transmitted to power splitter 2 through coaxial line, is divided through power splitter 2 for two paths of signals.
Transmitted through the signal all the way that power splitter 2 separates as reference signal by reference to signal output part A2 to bandpass filtering
Device 3, the another way signal to 90 ° of electric bridges 4, separated through power splitter 2 is transmitted as sampling oscilloscope through coaxial line after signal filtering
Trigger signal transmitted by trigger signal output terminals A 3 through coaxial line to the triggering input of sampling oscilloscope 5 to be modified, be
Sampling oscilloscope 5 provides trigger signal.
The orthogonal sine signal that two-way phase difference is 90 ° is exported after 90 ° of signal transactings of electric bridge 4, respectively through isometric same
Axis is inputted to the passage three of oscillograph 5 to be modified and passage four.
Sampling oscilloscope 5, base when passing through regulation, data acquisition window at least need the two-way for gathering a cycle orthogonal just
String reference signal.
Computer 6, the beginning of the data acquisition for controlling sampling oscilloscope 5, end, data length collection etc., passes through
GPIB or USB interface read the passage one, passage three, the test data of passage four of sampling oscilloscope storage, and by a series of
Coordinate transform and extreme value approximate procedure, obtain sampling oscilloscope 5 triggering shake best estimate, and according to triggering shake
Measured signal of the best estimate to passage one is modified, and obtains revised measured signal.
Because currently conventional high bandwidth sampling oscilloscope 5 is all modular, each module includes two passages, in order to
Ensure not introducing new error when gathering signal, it is necessary to two-way orthogonal sine signal be inputted logical to same module
Road, passage three and passage four are such as input to, and ensure at least to accommodate in the whole data acquisition window of sampling oscilloscope
A cycle, so that data processing afterwards can be normally carried out.
Due to input to the passage three of sampling oscilloscope 5 and the two-way reference signal of passage four be initially it is orthogonal, therefore,
It is considered that the difference gathered in computer 6 between the signal waveform of acquisition and the waveform of former input reference signal is by sampling
Caused by the triggering shake of oscillograph 5, the method for obtaining the best estimate of the triggering shake of sampling oscilloscope 5 is specific as follows：
(1), by after the data acquisition of the passage three of sampling oscilloscope 5 and passage four, two paths of signals time shaft is alignd, and
Drawn using the range value of two paths of signals as abscissa and ordinate, an ellipse will be obtained；
(2), ellipse is translated by transformation of coordinates, the center of ellipse is overlapped with the origin of coordinates；
(3), around the origin of coordinates by ELLIPTIC REVOLUTION θ angles, the major and minor axis of the ellipse x-axis and y-axis with coordinate system respectively is made
Overlap；
(4), by changing oval parameter, ellipse is converted into unit circle；
(5) unit circle opposite direction, is rotated into θ angles, recovery time information.
It is the triggering jitter value for obtaining sampling oscilloscope 5 that elliptic transformation is justified into unit, and the triggering jitter value is to utilize
Such as the mathematical method of quasi-Newton method approaches etc. the optimal solution being calculated by extreme value, gained optimal solution is sampling oscilloscope
The best estimate of 5 triggering shakes.With the triggering jitter value that is calculated to the sampling oscilloscope 5 that collects in computer 6
The test data of passage one is modified and shown.
As shown in Fig. 2 the invention also discloses a kind of method for being used to correct the triggering shake of high-speed sampling oscillograph, the party
Method specifically includes：
S1, using data-signal as measured signal, is passed through by measured signal output terminals A 1 all the way caused by pattern generator 1
Coaxial line is transmitted to the passage one of sampling oscilloscope 5 to be modified；
S2, the another way signal caused by pattern generator 1 with the synchronic base of data-signal is transmitted to work(through coaxial line and divided
Device 2, two paths of signals is produced through power splitter 2；
S3, sent by reference to signal output part A2 to band logical using the signal all the way that power splitter 2 separates as reference signal
Wave filter 3；Another way signal is sent to the triggering input of sampling oscilloscope 5 as trigger signal；
S4, bandpass filter 3 will be transmitted to 90 ° of electric bridges by the filtered signal of signal；
After S5,90 ° of electric bridges 4 are divided into the orthogonal sine signal that two-way phase difference is 90 ° after orthogonal transformation, transmit respectively
To the passage three and passage four of sampling oscilloscope 5；
S6, the when base for adjusting sampling oscilloscope 5, make the signal of passage three and passage four be adopted in the data of sampling oscilloscope 5
A cycle can be at least shown respectively in collection window；
S7, using computer 6 control the beginning of data acquisition, end, data length of sampling oscilloscope 5 to gather, pass through
GPIB or USB interface read the passage one, passage three, the test data of passage four of sampling oscilloscope storage, and by a series of
Coordinate transform and extreme value approximate procedure, obtain sampling oscilloscope 5 triggering shake, and according to triggering shake best estimate
Measured signal to passage one is modified, and obtains revised measured signal.
As shown in Figure 3 and Figure 4, in step S7, obtaining the method for the best estimate of the triggering shake of sampling oscilloscope 5 includes
Following sub-step：
S701, by after the data acquisition of the passage three of sampling oscilloscope 5 and passage four, two paths of signals time shaft is alignd,
And drawn using the range value of two paths of signals as abscissa and ordinate, an ellipse will be obtained；
S702, by transformation of coordinates by ellipse translate, make ellipse center overlapped with the origin of coordinates；
S703, around the origin of coordinates by ELLIPTIC REVOLUTION θ angles, make the major and minor axis of the ellipse x-axis and y-axis with coordinate system respectively
Overlap；
S704, the parameter by changing ellipse, unit circle is converted into by ellipse；
S705, by unit circle opposite direction rotate θ angles, recovery time information.
It is the triggering jitter value for obtaining sampling oscilloscope 5 that elliptic transformation is justified into unit, and the triggering jitter value is to utilize
Such as the mathematical method of quasi-Newton method passes through the optimal solution that extreme value approximation computation is drawn, gained optimal solution is sampling oscilloscope 5
Trigger the best estimate of shake.It is logical to the sampling oscilloscope 5 collected with the triggering jitter value being calculated in computer 6
The test data in road one is modified and shown.
In summary, technical scheme of the present invention, generation and processing based on orthogonal sinusoidal reference signal, can be corrected
The triggering shake of high-speed sampling oscillograph, makes measurement result more truly reflect actual index, improves instrument and equipment and device
The measurement of part is horizontal.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical scheme is extended out still in protection scope of the present invention.
Claims (8)
1. a kind of device for correcting sampling oscilloscope triggering shake, it is characterised in that described device includes
Signal source, for producing the first signal and secondary signal of synchronic base, the of first signal output to sampling oscilloscope
One input；
Power splitter, for the secondary signal from signal source to be divided into reference signal and sampling oscilloscope trigger signal；
90 ° of electric bridges, for the reference signal from power splitter to be divided into the two-way orthogonal sine signal that phase difference is 90 °, and divide
Do not export to the second of sampling oscilloscope and the 3rd input；
Data acquisition and processing unit, the triggering that the two-way sinusoidal signal based on sampling oscilloscope calculates the sampling oscilloscope are trembled
Dynamic value, and the triggering jitter value to be calculated is modified to first signal；
Wherein, the triggering jitter value for calculating the sampling oscilloscope comprises the following steps：
By the two-way reference signal time shaft collected align, and respectively using the range value of two-way reference signal as abscissa with
Ordinate is drawn, and obtains an ellipse；
By the way that elliptic transformation is obtained into the triggering jitter value into unit circle.
2. the device of amendment sampling oscilloscope triggering shake according to claim 1, it is characterised in that described device enters one
Step includes
Bandpass filter, for being filtered to the reference signal from shown power splitter, and by filtered signal transmit to
90 ° of electric bridges.
3. the device of amendment sampling oscilloscope triggering shake according to claim 1, it is characterised in that described
Data acquisition and processing unit at least need to gather the two-way sinusoidal signal of a cycle to calculate in gatherer process
The triggering jitter value of sampling oscilloscope.
A kind of 4. method for correcting sampling oscilloscope triggering shake, it is characterised in that methods described includes
Measured signal is transmitted to sampling oscilloscope first input end；
Another way signal with the synchronic base of measured signal is divided into reference signal and trigger signal；
It is 90 ° of two-way orthogonal sine signal that the reference signal is divided into phase difference, is transmitted separately to the of sampling oscilloscope
Two and the 3rd input；
Sampling oscilloscope is sampled based on the trigger signal to the measured signal and the two-way orthogonal sine signal；
Data processing is carried out to the two-way orthogonal sine signal gathered and obtains the triggering jitter value of the sampling oscilloscope, is obtained
The triggering jitter value of the sampling oscilloscope comprises the following steps：The two-way reference signal time shaft collected is alignd, and point
Do not drawn using the range value of two-way reference signal as abscissa and ordinate, obtain an ellipse；By the way that ellipse is become
Change unit circle into and obtain the triggering jitter value；
The measured signal gathered is modified based on the triggering jitter value.
5. the method for amendment sampling oscilloscope triggering shake according to claim 4, it is characterised in that the reference signal
It is divided into the two-way orthogonal sine signal that phase difference is 90 ° after signal filters.
6. the method for amendment sampling oscilloscope triggering shake according to claim 4, it is characterised in that described
Sampling oscilloscope at least needs to gather the two-way sinusoidal signal of a cycle in sampling process.
7. the method for amendment sampling oscilloscope triggering shake according to claim 4, it is characterised in that passed through with quasi-Newton method
Optimal solution that extreme value approximation computation is drawn is crossed as the triggering jitter value.
8. a kind of sampling oscilloscope for triggering shake and being corrected, the sampling oscilloscope include multiple inputs, it is characterised in that institute
The sampling oscilloscope is stated to further comprise：
First input end, for receiving the first signal from signal source；
Second input and the 3rd input, it is respectively used to receive the phase difference separated with the secondary signal of the synchronic base of the first signal
For 90 ° of two-way orthogonal sine signal；
Data acquisition and processing module, the triggering that the two-way sinusoidal signal based on sampling oscilloscope calculates the sampling oscilloscope are trembled
Dynamic value, and the triggering jitter value to be calculated is modified to first signal, obtains being corrected the sampling oscilloscope
Triggering jitter value the first signal；
Wherein, the triggering jitter value for calculating the sampling oscilloscope comprises the following steps：
By the two-way reference signal time shaft collected align, and respectively using the range value of two-way reference signal as abscissa with
Ordinate is drawn, and obtains an ellipse；
By the way that elliptic transformation is obtained into the triggering jitter value into unit circle.
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| CN106603166B (en) * | 2016-10-21 | 2021-04-02 | 北京无线电计量测试研究所 | Vector measurement device and method for broadband modulation signal |
| CN110730055B (en) * | 2019-10-22 | 2022-07-05 | 上海创远仪器技术股份有限公司 | Method for realizing 5G signal emission modulation quality measurement based on signal analyzer |
| CN113447873B (en) * | 2021-07-12 | 2022-07-19 | 北京无线电计量测试研究所 | Sampling oscilloscope complex frequency response calibration device and method |
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| US6564160B2 (en) * | 2001-06-22 | 2003-05-13 | Agilent Technologies, Inc. | Random sampling with phase measurement |
| CN101232333B (en) * | 2008-01-16 | 2011-06-22 | 中兴通讯股份有限公司 | Clock shake measuring method and oscilloscope for measuring clock shake |
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