CN105467228B - A kind of phase noise measurement data processing and display device and method based on sliding cross-correlation and sunset glow technology - Google Patents
A kind of phase noise measurement data processing and display device and method based on sliding cross-correlation and sunset glow technology Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
Abstract
The invention proposes a kind of phase noise measurement data processings and display device based on sliding cross-correlation and sunset glow technology, comprising: data buffer zone component, FFT arithmetic unit, computing cross-correlation component, current computing cross-correlation result feature, n times computing cross-correlation result feature and display processing unit.Phase noise measurement data processing of the invention and display device and method, it can effectively identify the signal there are short-term instability, since this programme can carry out display processing to each computing cross-correlation result, it need not be until just carrying out display processing after the completion of n times computing cross-correlation, the phase noise characteristic of measured signal can be analyzed in time, once it was found that measured signal there are short-term instability, can stop measuring in time, without completing until n times computing cross-correlation.
Description
Technical field
The present invention relates to data processing field, in particular to a kind of phase noise measurement data processing and display device, also
It is related to a kind of phase noise measurement data processing and display methods.
Background technique
Phase noise, in a kind of form of expression of frequency domain, is the one of many modern electronic equipments as short-term frequency stability
Item important indicator, corresponding test equipment are also widely paid attention to.With the development of modern electronic technology, to phase noise
The indexs such as the phase noise measurement sensitivity of test macro and resolution ratio propose increasingly higher demands.And phase noise is tested
The promotion of the indexs such as sensitivity and resolution ratio, other than dependent on high performance device is selected, it is often more important that dependent on to acquisition
High-volume data carry out complicated operation and processing and be achieved.
A kind of common method of phase noise measurement is " Phase Demodulation+cross-correlation technique ", and this method can be by repeatedly mutual
Related operation increases substantially phase noise measurement sensitivity and resolution ratio, such as: when carrying out 10000 computing cross-correlations, phase
The sensitivity of position noise testing can improve 20dB.
Currently, the signal source analyzer of Agilent company is the most fast instrument of phase noise measurement, the instrument using
" Phase Demodulation+cross-correlation technique ", each cross correlation measurement need 13 seconds time, could support up 10000 computing cross-correlations,
One-shot measurement result is returned after the completion of the cross-correlation number of user setting.
For example, being measured when 10000 computing cross-correlations of user setting and return measurement result needs being 36 small
When, in so long time of measuring, serious mistake may be had occurred with the influence of environmental factor in the phase noise characteristic of signal
Very, measurement result may not necessarily react the true phase noise characteristic of measured signal.
Therefore, how within the shortest time return measurement as a result, can analyze the phase noise of measured signal again in time
Characteristic and variation tendency are the critical issues that this field needs to solve.
Fig. 1 is the common data processing of phase noise measurement and display methods block diagram, 8 sections of surveys that this method sends FPGA
The FFT operation that amount data send FFT arithmetic unit to carry out A, B two-way respectively, then send computing cross-correlation component to hold operation result
Row computing cross-correlation.In 8 sections of initial data of cross correlation measurement, the internal mutual associated numbers of times of every segment data, which is handled, to be completed
Afterwards, it can be all sent into the storage that storage unit carries out computing cross-correlation result, after the completion of the n times computing cross-correlation of user setting,
It gives the average value of this n times computing cross-correlation result to display processing unit again and carries out display processing.
The structure composition of prior art include: data buffer zone component, FFT arithmetic unit, computing cross-correlation component,
N times computing cross-correlation result feature, display processing unit.
Data buffer zone component is used to store the initial data from FPGA measurement, and point 8 sections of storages respectively correspond section 0, section
1 ... ..., A, B two-way initial data of section 7, corresponding internal mutual associated numbers of times is respectively m0, m1 ... ..., m7.
FFT arithmetic unit includes FFT A arithmetic unit and FFT B arithmetic unit, for certain section of A, B two-way initial data
FFT operation is executed, order of operation is successively carried out according to the FPGA initial data sequencing sent.
Computing cross-correlation component is used to execute computing cross-correlation to A, B two-way FFT operation result.
8 buffer areas built in n times computing cross-correlation result feature store answer section 0, section 1 ... ... respectively, and mj*i times of section 7
For computing cross-correlation as a result, wherein the value of j is 0~7,0~section of corresponding segment 7, mj indicates the internal mutual associated numbers of times of corresponding segment, i
Value range be 1~N.
Display processing unit carries out display processing to the average value of n times computing cross-correlation result.
The action relationships of the prior art illustrate:
(1) certain section of measurement initial data is sent into the designated memory cell of data buffer zone component, notice FFT fortune by FPGA
Component is calculated, the data of this section have been prepared for；
(2) it after FFT arithmetic unit has notice, reads and surveys from the storage unit of data buffer zone component if idle
Initial data is measured, A, B two paths of data are resolved into, FFT A arithmetic unit is respectively fed to and FFTB arithmetic unit executes the FFT of plural number
Operation, and operation result is sent into computing cross-correlation component, then the FFT operation of computing cross-correlation component is notified to complete；
(3) after computing cross-correlation component is notified, computing cross-correlation is executed to the FFT operation result of A, B two-way, and will
The computing cross-correlation result of this section is saved in n times computing cross-correlation result feature；
It, will if the computing cross-correlation result data before being not present in this section of n times computing cross-correlation result feature
The current computing cross-correlation result of the section is saved in corresponding result buffer；
If the computing cross-correlation result data before existing in this section of n times computing cross-correlation result feature, by it
Preceding computing cross-correlation result is averaged with current computing cross-correlation result, and will it is average after result be saved in corresponding knot
In fruit buffer area；
(4) repeating step (1)~(3), all processing is completed until mj*N computing cross-correlation of 8 sections of initial data；
(5) after the completion of mj*N computing cross-correlation all processing, computing cross-correlation component is informed about display processing unit
Part cross-correlation is completed, and after display processing unit is notified, carries out display processing to n times cross correlation results.
In terms of the shortcomings that prior art, is mainly reflected in following two:
(1), it can not identify the signal there are short-term instability: after the completion of specified n times computing cross-correlation, can just return
One-shot measurement is returned as a result, the short-term instability of measured signal may be averaged place after n times computing cross-correlation during this period
Reason is fallen, and can not find the short-term instability of measured signal；
(2), user is bad determines how one suitable cross-correlation times N of selection: when the cross-correlation times N of setting is smaller
When, the sensitivity and resolution ratio that user wants may be not achieved, when the cross-correlation times N of setting is larger, user needs to wait
Longer time of measuring ability return measurement is as a result, this is difficult to endure for users, especially when user is waiting very long survey
After measuring the time, when the measurement result of return and its desired value differ greatly, user is even more to be difficult to receive.
Summary of the invention
The invention proposes a kind of phase noise measurement data processings and display based on sliding cross-correlation and sunset glow technology
Device and method, by combining sliding cross-correlation technique and sunset glow technology to solve present in the multiple cross-correlation test process
Following point: (1) it can not prejudge and how many times cross-correlation is needed just test result can be made to meet test request problem；It (2) can not be true
The intermediate test mode problem of real reaction signal, for example, the problems such as signal short-term instability or losing lock may be multiple
Average treatment is fallen after cross-correlation；(3) measured signal can generate frequency with the influence of environmental factor in prolonged test process
Drift, so as to cause measuring error problem.
The technical scheme of the present invention is realized as follows:
A kind of phase noise measurement data processing and display device based on sliding cross-correlation and sunset glow technology, comprising: number
According to buffer area component, FFT arithmetic unit, computing cross-correlation component, current computing cross-correlation result feature, n times computing cross-correlation
Result feature and display processing unit；
The data buffer zone component is used to store the initial data from FPGA measurement, stores corresponding segment 0, section respectively
1 ... ..., A, B two-way initial data of section 7, corresponding internal mutual associated numbers of times is respectively m0, m1 ... ..., m7；
The FFT arithmetic unit includes FFT A arithmetic unit and FFT B arithmetic unit, for former to certain section of A, B two-way
Beginning data execute FFT operation, and order of operation is successively carried out according to the FPGA initial data sequencing sent；
The computing cross-correlation component is used to execute computing cross-correlation to A, B two-way FFT operation result；
The current computing cross-correlation result feature is for storing current computing cross-correlation as a result, built-in 8 buffer areas, divide
The current computing cross-correlation result of 0~section of other memory paragraph 7；
N-1 buffer area built in the n times computing cross-correlation result feature, N-1 computing cross-correlation knot before storing respectively
Fruit；
The display processing unit carries out the average value of current computing cross-correlation result and preceding i computing cross-correlation result
Display processing, wherein the value range of i is 0~N-1.
Based on above-mentioned apparatus, the invention also provides a kind of phase noise measurement data processing and display methods, including with
Lower step:
Certain section of measurement initial data is sent into the designated memory cell of data buffer zone component, notice by step (1), FPGA
The data of FFT arithmetic unit, this section have been prepared for；
Step (2), after FFT arithmetic unit has notice, from the storage unit of data buffer zone component if idle
Measurement initial data is read, A, B two paths of data are resolved into, FFT A arithmetic unit is respectively fed to and FFT B arithmetic unit executes again
Several FFT operations, and operation result is sent into computing cross-correlation component, then the FFT operation of computing cross-correlation component is notified to complete；
Step (3) after computing cross-correlation component is notified, executes internal cross-correlation to the FFT operation result of A, B two-way
Operation, and the internal mutual correlation result of this section is saved in current computing cross-correlation result feature；
Step (4) repeats step (1)~(3) until the inside computing cross-correlation of 8 sections of initial data of a cross-correlation is complete
Portion's processing is completed；
Step (5), if the cross-correlation times N of user setting is greater than 1, computing cross-correlation component transports current cross-correlation
The corresponding unit that calculation result is sent to n times computing cross-correlation result feature is stored, and display processing unit is notified to be shown
Show processing；
Step (6), after display processing unit is notified, if before being not present in n times computing cross-correlation result feature
Computing cross-correlation carry out display place as a result, then reading current computing cross-correlation result from current computing cross-correlation result feature
Reason；If the computing cross-correlation before existing in n times computing cross-correlation result feature as a result, if display processing unit will be currently mutual
Correlation result then carries out display processing with after i computing cross-correlation result is averaged before；
Step (7) repeats step (1)~(6) until n times computing cross-correlation all complete by processing.
Optionally, the step (3) specifically includes the following steps:
Step (31), if the computing cross-correlation result before being not present in this section of current computing cross-correlation result feature
This section of current computing cross-correlation result is then saved in the result buffer of this section by data；
Step (32), if the computing cross-correlation number of results before existing in this section of current computing cross-correlation result feature
According to, then computing cross-correlation result before is averaged with current computing cross-correlation result, and will it is average after result save
Into the result buffer of this section.
The beneficial effects of the present invention are:
(1) signal there are short-term instability can be effectively identified: since this programme can be to each computing cross-correlation
As a result display processing is carried out, it is not necessary to until just carrying out display processing, the phase noise of measured signal after the completion of n times computing cross-correlation
Characteristic can be analyzed in time, once discovery measured signal can stop measuring in time there are short-term instability, without etc.
It is completed to n times computing cross-correlation；
(2) when user do not know the great cross-correlation number of setting can achieve desired phase noise measurement sensitivity and
When resolution ratio, a biggish cross-correlation number can be set, since this method can observe measurement result every time, once it reaches
When the phase noise measurement sensitivity and resolution ratio wanted to user, it can stop measuring immediately, without waiting until all cross-correlation
Number all handles completion；
(3) during phase noise measurement, user's discovery is after measurement reaches certain cross-correlation number, if phase is made an uproar
Acoustic curve not decreased significantly trend in the increase with cross-correlation number, then explanation currently has reached or approached tested
The phase noise true value of signal continues to measure without devoting a tremendous amount of time.
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
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is existing phase noise measurement data processing and display methods functional block diagram；
Fig. 2 is the phase noise measurement data processing and display device the present invention is based on sliding cross-correlation and sunset glow technology
Functional block diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is 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.
The present invention is based on sliding cross-correlation technique and sunset glow technology propose a kind of phase noise measurement data processing and
Display device and method.
Sliding cross-correlation refers to when the cross-correlation number that not up to user specifies (assuming that the cross-correlation number that user specifies
For N), the measurement result for currently having completed number is averaging processing and is shown, the cross-correlation that user specifies is secondary when reaching
When number N, nearest n times computing cross-correlation result is averaging processing and is shown.
Sunset glow, which refers to, shows that the number of superposition is more, and brightness is higher for each computing cross-correlation curve combining, can pass through
The curve distribution repeatedly drawn is observed, finds that measured signal whether there is short-term instability in time.
It can make each phase noise measurement that can be refreshed and be shown, user by using sliding cross-correlation technique
It can find whether the phase noise curve of measured signal anomalous variation occurs in time.When user needs how many times mutual unclear
When related operation can achieve the sensitivity and resolution ratio of phase noise measurement, a biggish cross-correlation number can be set,
The changing rule of each phase noise measurement curve is observed in real time, once reach expected sensitivity and resolution ratio index request
When, it can stop measuring immediately.
The track distribution of each phase noise measurement can be shown by using sunset glow technology, user can be by being drawn
Track intensity distribution, whether observation signal there is short-term instability, obtain measurement conclusion to terminate measurement in time.
Fig. 2 is the phase noise measurement data processing and display device the present invention is based on sliding cross-correlation and sunset glow technology
Functional block diagram.
Phase noise measurement data processing of the invention and display device, comprising: data buffer zone component, FFT operational part
Part, computing cross-correlation component, current computing cross-correlation result feature, n times computing cross-correlation result feature and display processing unit.
The data buffer zone component is used to store the initial data from FPGA measurement, stores corresponding segment 0, section respectively
1 ... ..., A, B two-way initial data of section 7, corresponding internal mutual associated numbers of times is respectively m0, m1 ... ..., m7.
The FFT arithmetic unit includes FFT A arithmetic unit and FFT B arithmetic unit, for former to certain section of A, B two-way
Beginning data execute FFT operation, and order of operation is successively carried out according to the FPGA initial data sequencing sent.
The computing cross-correlation component is used to execute computing cross-correlation to A, B two-way FFT operation result.
The current computing cross-correlation result feature is for storing current computing cross-correlation as a result, built-in 8 buffer areas, divide
The current computing cross-correlation result of 0~section of other memory paragraph 7.
N-1 buffer area built in the n times computing cross-correlation result feature, N-1 computing cross-correlation knot before storing respectively
Fruit.
The display processing unit carries out the average value of current computing cross-correlation result and preceding i computing cross-correlation result
Display processing, wherein the value range of i is 0~N-1.
Based on above-mentioned phase noise measurement data processing and display device, the invention also provides a kind of phase noise measurements
Data processing and display methods, action relationships are as follows:
Certain section of measurement initial data is sent into the designated memory cell of data buffer zone component, notice by step (1), FPGA
The data of FFT arithmetic unit, this section have been prepared for；
Step (2), after FFT arithmetic unit has notice, from the storage unit of data buffer zone component if idle
Measurement initial data is read, A, B two paths of data are resolved into, FFT A arithmetic unit is respectively fed to and FFT B arithmetic unit executes again
Several FFT operations, and operation result is sent into computing cross-correlation component, then the FFT operation of computing cross-correlation component is notified to complete；
Step (3) after computing cross-correlation component is notified, executes internal cross-correlation to the FFT operation result of A, B two-way
Operation, and the internal mutual correlation result of this section is saved in current computing cross-correlation result feature；Step (3) is specifically wrapped
It includes:
Step (31), if the computing cross-correlation result before being not present in this section of current computing cross-correlation result feature
This section of current computing cross-correlation result is then saved in the result buffer of this section by data；
Step (32), if the computing cross-correlation number of results before existing in this section of current computing cross-correlation result feature
According to, then computing cross-correlation result before is averaged with current computing cross-correlation result, and will it is average after result save
Into the result buffer of this section；
Step (4) repeats step (1)~(3) until the inside computing cross-correlation of 8 sections of initial data of a cross-correlation is complete
Portion's processing is completed；
Step (5), if the cross-correlation times N of user setting is greater than 1, computing cross-correlation component transports current cross-correlation
The corresponding unit that calculation result is sent to n times computing cross-correlation result feature is stored, and display processing unit is notified to be shown
Show processing；
Step (6), after display processing unit is notified, if before being not present in n times computing cross-correlation result feature
Computing cross-correlation carry out display place as a result, then reading current computing cross-correlation result from current computing cross-correlation result feature
Reason；If the computing cross-correlation before existing in n times computing cross-correlation result feature as a result, if display processing unit will be currently mutual
Correlation result then carries out display processing with after i computing cross-correlation result is averaged before.
Step (7) repeats step (1)~(6) until n times computing cross-correlation all complete by processing.
Phase noise measurement data processing of the invention and display device and method can be identified effectively in the presence of short-term unstable
Qualitative signal: since this programme can carry out display processing to each computing cross-correlation result, it is not necessary to until n times cross-correlation is transported
Display processing is just carried out after the completion of calculating, the phase noise characteristic of measured signal can be analyzed in time, once the tested letter of discovery
Number there are short-term instability, it can stop measuring in time, without completing until n times computing cross-correlation.
Moreover, when user does not know that the great cross-correlation number of setting can achieve desired phase noise measurement sensitivity
When with resolution ratio, a biggish cross-correlation number can be set, since this method can observe measurement result every time, once
When reaching the phase noise measurement sensitivity and resolution ratio that user wants, it can stop measuring immediately, without until all mutual
It closes number and all handles completion.
During phase noise measurement, user's discovery is after measurement reaches certain cross-correlation number, if phase noise
Curve not decreased significantly trend in the increase with cross-correlation number, then explanation currently has reached or approached tested letter
Number phase noise true value, without devote a tremendous amount of time continue measurement go down.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of phase noise measurement data processing and display device, feature based on sliding cross-correlation and sunset glow technology exists
In, comprising: data buffer zone component, FFT arithmetic unit, computing cross-correlation component, current computing cross-correlation result feature, n times
Computing cross-correlation result feature and display processing unit；
The FFT arithmetic unit includes FFT A arithmetic unit and FFT B arithmetic unit, for certain section of A, B two-way original number
According to FFT operation is executed, order of operation is successively carried out according to the FPGA initial data sequencing sent；
The computing cross-correlation component is used to execute computing cross-correlation to A, B two-way FFT operation result；
The data buffer zone component is used to store the initial data from FPGA measurement, stores corresponding segment 0, section respectively
1 ... ..., A, B two-way initial data of section 7, corresponding cross-correlation number is respectively m0, m1 ... ..., m7；
The current computing cross-correlation result feature is for storing current computing cross-correlation as a result, built-in 8 buffer areas, are deposited respectively
Store up the current computing cross-correlation result of 0~section of section 7；
N-1 buffer area built in the n times computing cross-correlation result feature, N-1 computing cross-correlation result before storing respectively；
The display processing unit shows the average value of current computing cross-correlation result and preceding i computing cross-correlation result
Processing, wherein the value range of i is 0~N-1.
2. a kind of phase noise measurement data processing and display methods based on claim 1 described device, which is characterized in that packet
Include following steps:
Certain section of measurement initial data is sent into the designated memory cell of data buffer zone component by step (1), FPGA, notifies FFT
The data of arithmetic unit, this section have been prepared for；
Step (2) after FFT arithmetic unit has notice, is read if idle from the storage unit of data buffer zone component
Initial data is measured, A, B two paths of data are resolved into, FFT A arithmetic unit is respectively fed to and FFT B arithmetic unit executes plural number
FFT operation, and operation result is sent into computing cross-correlation component, then the FFT operation of computing cross-correlation component is notified to complete；
Step (3) after computing cross-correlation component is notified, executes internal cross-correlation fortune to the FFT operation result of A, B two-way
It calculates, and the internal mutual correlation result of this section is saved in current computing cross-correlation result feature；
Step (4), repeatedly step (1)~(3) are at the inside computing cross-correlation whole of 8 sections of initial data of a cross-correlation
Reason is completed；
Step (5), if the cross-correlation times N of user setting is greater than 1, computing cross-correlation component is by current computing cross-correlation knot
The corresponding unit that fruit is sent to n times computing cross-correlation result feature is stored, and display processing unit is notified to carry out at display
Reason；
Step (6), after display processing unit is notified, if mutual before being not present in n times computing cross-correlation result feature
Correlation result then reads current computing cross-correlation result from current computing cross-correlation result feature and carries out display processing；
If the computing cross-correlation before existing in n times computing cross-correlation result feature as a result, if display processing unit will be currently mutual
After closing operation result and i computing cross-correlation result being averaged before, then carry out display processing；
Step (7) repeats step (1)~(6) until n times computing cross-correlation all complete by processing.
3. phase noise measurement data processing as claimed in claim 2 and display methods, which is characterized in that the step (3)
Specifically includes the following steps:
Step (31), if the computing cross-correlation number of results before being not present in this section of current computing cross-correlation result feature
According to then this section of current computing cross-correlation result is saved in the result buffer of this section；
Step (32), if the computing cross-correlation result data before existing in this section of current computing cross-correlation result feature,
Then computing cross-correlation result before is averaged with current computing cross-correlation result, and will it is average after result be saved in this
In the result buffer of section.
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| EP0398780A1 (en) * | 1989-05-19 | 1990-11-22 | Thomson-Csf | Measuring chain for determing the characteristic of additional phase noise of a component near a carrier frequency |
| CN103197160A (en) * | 2013-03-14 | 2013-07-10 | 东南大学 | Detecting method of residual phase noise of electronic device and device thereof |
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| JP2005308511A (en) * | 2004-04-21 | 2005-11-04 | Agilent Technol Inc | Method and apparatus for measuring phase noise |
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|---|---|---|---|---|
| EP0398780A1 (en) * | 1989-05-19 | 1990-11-22 | Thomson-Csf | Measuring chain for determing the characteristic of additional phase noise of a component near a carrier frequency |
| CN103197160A (en) * | 2013-03-14 | 2013-07-10 | 东南大学 | Detecting method of residual phase noise of electronic device and device thereof |
| CN104062514A (en) * | 2014-07-02 | 2014-09-24 | 中国电子科技集团公司第四十一研究所 | Device and method for measuring pulse carrier phase noise |
| CN104122457A (en) * | 2014-07-15 | 2014-10-29 | 中国电子科技集团公司第四十一研究所 | Pulse modulation signal phase noise measuring device and method |
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