CN106771651A - The synchronous method of data acquisition in a kind of pulse network analyzer pulse - Google Patents
The synchronous method of data acquisition in a kind of pulse network analyzer pulse Download PDFInfo
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- CN106771651A CN106771651A CN201611036485.5A CN201611036485A CN106771651A CN 106771651 A CN106771651 A CN 106771651A CN 201611036485 A CN201611036485 A CN 201611036485A CN 106771651 A CN106771651 A CN 106771651A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
Abstract
The present invention proposes a kind of synchronous method of data acquisition in pulse network analyzer pulse, data pre-acquired is carried out before test, it is calculated pulse to arrive the moment, is compared with pulse synchronous signal and obtains deviation, and then data acquisition time delay is modified.The method of the present invention can be realized judging the pulse arrival moment automatically, the data acquisition moment is modified automatically；Measurement position in pulse can be accurately set in impulsive synchronization test, it is accurate to obtain the data for needing；Data processing method is simple, and amount of calculation is smaller, and test speed will not be caused to significantly affect；Noise jamming can be excluded using narrow-band filtering, still can accurately be detected when signal is smaller, sensitivity is high.
Description
Technical field
The present invention relates to technical field of measurement and test, the synchronization of data acquisition in more particularly to a kind of pulse network analyzer pulse
Method.
Background technology
Pulse network analyzer is simultaneously to receive its scattered signal by producing pulse excitation signal, excitation measured piece, so that
The instrument of measured piece characterisitic parameter is obtained, its primary structure is as shown in Figure 1.
Pulse network analyzer produces radio frequency continuous wave signal by radio-frequency signal source, while producing one by impulse generator
Determine the pulse signal of frequency and dutycycle.Radio frequency continuous wave is modulated to pulse-modulated signal, arteries and veins by pulse signal by modulator
Modulated signal is scattered in being injected into measured piece, and scattered signal is received by Network Analyzer, and intermediate frequency letter is changed into after mixed
Number, data signal is changed into by analog/digital conversion, obtain after data processing the characterisitic parameter of measured piece.
Pulse network measurement has different measurement patterns, it is necessary to be carried out to the signal in pulse under synchro measure pattern
Fixed-point data is gathered.Analog/digital converter is that the pulse produced by impulse generator is synchronized, with pulse-modulated signal frequently
Rate is identical, and sets certain time delay, as shown in Figure 2.The RF pulse signal that modulator is produced by measured piece and will connect
Receipts machine passage, can all produce time delay, especially the electrical length of measured piece than it is larger when, time delay is particularly evident.This can cause pulse
Intermediate-freuqncy signal reaches the time lag of analog/digital converter in pulse synchronous signal, causes the collection moment inaccurate, or even adopt
Outside signal, influence is brought on test result.At present, the size of time delay typically manually estimates, is adjusted manually.
Prior art has the deficiency of following two aspects：
(1) artificial setting data collection point, is needed relative to the time delay of synchronizing signal.Due to signalling channel cannot be known
Accurate electrical length, therefore in the accurate foundation of no one of estimation, generally require repeatedly to be attempted suitable to find
Data collection point, thus testing efficiency is difficult to improve.
(2) accurate location of the data collection point in pulse signal, cannot be obtained, if data are adopted when pulse is unstable
Outside quarter or pulse, larger noise can be introduced, make test result inaccurate.
The content of the invention
To solve above-mentioned deficiency of the prior art, the present invention proposes data acquisition in a kind of pulse network analyzer pulse
Synchronous method.
The technical proposal of the invention is realized in this way：
The synchronous method of data acquisition, carries out data pre-acquired before test in a kind of pulse network analyzer pulse,
It is calculated pulse to arrive the moment, is compared with pulse synchronous signal and obtains deviation, and then data acquisition time delay is carried out
Amendment.
Alternatively, in above-mentioned pulse network analyzer pulse data acquisition synchronous method, implement step as follows：
Step (1), pre-acquired is carried out to intermediate-freuqncy signal according to pulse synchronous signal, the scope of collection includes a pulse week
Phase, wherein, the pulse signal cycle for modulating is T, and pulse width is Pw, and if sampling frequency is fs, then pre-acquired points
It is T/fs；
Step (2), the sinusoidal signal with if sampling frequency with frequency is produced using FPGA, points are similarly T/fs, and pre-
Sampled data is multiplied, and thus moves to the position of 0 and 2fs the spectral centroid of medium-frequency pulse signal；
Step (3), data are carried out with LPF, retain the spectral line near 0 frequency, filter image frequency and other frequencies into
Point；
Step (4), filtered signal contain the envelope information of pulse signal, its peak value respective pulses signal center
Point, takes moment of Amplitude maxima for tm, because pulse width is Pw, therefore tc=tm-Pw/2 be exactly medium-frequency pulse relative to
The time delayses of pulse synchronous signal；
Step (5), the data acquisition moment is modified, it would be desirable to which the delay time of fixed test adds tc, exactly needs
Proceed by the moment of data acquisition.
Alternatively, in the step (3), filter bandwidht is adjusted with the size that spectral line is spaced.
Alternatively, in the step (3), spectral line interval delta f is determined by pulse repetition period T, meets Δ f=1/T.
Alternatively, using narrow-band filtering reduction noise jamming, filter bandwidht is set to Δ f, first spectral line of reservation
Information.
The beneficial effects of the invention are as follows：
(1) can realize judging the pulse arrival moment automatically, the data acquisition moment is modified automatically；
(2) measurement position in pulse can be accurately set in impulsive synchronization test, it is accurate to obtain the data for needing；Data
Processing method is simple, and amount of calculation is smaller, and test speed will not be caused to significantly affect；
(3) noise jamming can be excluded using narrow-band filtering, still can be accurately detected when signal is smaller, sensitivity
It is high.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of pulse network analyzer；
Fig. 2 is impulsive synchronization test schematic diagram；
Fig. 3 is the schematic diagram of synchronous method step (1) of the invention；
Fig. 4 is the schematic diagram of synchronous method step (2) of the invention；
Fig. 5 is the schematic diagram of synchronous method step (3) of the invention；
Fig. 6 is the schematic diagram of synchronous method step (4) of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Pumping signal can be carried out impulse modulation by pulse network analyzer, and pumping signal is after measured piece scattering by network
Analysis instrument receiver is received, for extracting the information such as amplitude-phase., it is necessary to digital receiver exists in lock-out pulse test pattern
The pulse arrival moment carries out data acquisition, and pulse signal to signal from producing to reception, be by measured piece, cable and instrument
Device TCH test channel in itself, will produce certain time delay, digital receiver is not known when pulse signal arrives.Big time delay
May result in data acquisition to adopt outside pulse, signal to noise ratio is deteriorated, test result is inaccurate.Therefore, the present invention is proposed
A kind of synchronous method of data acquisition in pulse network analyzer pulse, the delayed data for obtaining pulse signal makes reception
The automatic pulse signals synchronization of machine, corrects the data acquisition moment, it is ensured that the reliability and accuracy of test.
The synchronous method of data acquisition in pulse network analyzer pulse of the invention, carries out data and adopts in advance before test
Collection, is calculated pulse and arrives the moment, is compared with pulse synchronous signal and obtains deviation, and then data acquisition time delay is entered
Row amendment, implements step as follows：
Step (1), pre-acquired is carried out to intermediate-freuqncy signal according to pulse synchronous signal, as shown in figure 3, the scope of collection is included
One pulse period, the pulse signal cycle for modulating is T, and pulse width is Pw, and if sampling frequency is fs, then pre-acquired
It is T/fs to count.
Step (2), the sinusoidal signal with if sampling frequency with frequency is produced using FPGA, points are similarly T/fs, and pre-
Sampled data is multiplied, and thus moves to the position of 0 and 2fs the spectral centroid of medium-frequency pulse signal, as shown in Figure 4.
Step (3), data are carried out with LPF, retain the spectral line near 0 frequency, filter image frequency and other frequencies into
Point, as shown in Figure 5.Filter bandwidht is adjusted with the size that spectral line is spaced.Spectral line interval delta f is by the pulse repetition period
T decisions, meet Δ f=1/T.Noise jamming can be reduced using narrow-band filtering, obtained than larger sensitivity, therefore will filtering
Device bandwidth is set to Δ f, mainly retains first information of spectral line.
Step (4), filtered signal contain the envelope information of pulse signal, its peak value respective pulses signal center
Point, as shown in fig. 6, the moment for taking Amplitude maxima is tm, because pulse width is Pw, therefore tc=tm-PW/2 is exactly intermediate frequency
Time delayses of the pulsion phase for pulse synchronous signal.
Step (5), the data acquisition moment is modified, it would be desirable to which the delay time of fixed test adds tc, exactly needs
Proceed by the moment of data acquisition.
The method of the present invention can be realized judging the pulse arrival moment automatically, the data acquisition moment is carried out automatically
Amendment；Measurement position in pulse can be accurately set in impulsive synchronization test, it is accurate to obtain the data for needing；Data processing side
Method is simple, and amount of calculation is smaller, and test speed will not be caused to significantly affect；Noise jamming can be excluded using narrow-band filtering,
Still can accurately be detected when signal is smaller, sensitivity is high.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (5)
1. in a kind of pulse network analyzer pulse data acquisition synchronous method, it is characterised in that
Data pre-acquired is carried out before test, pulse is calculated and is arrived the moment, be compared with pulse synchronous signal and obtained
Deviation, and then data acquisition time delay is modified.
2. in a kind of pulse network analyzer pulse as claimed in claim 1 data acquisition synchronous method, it is characterised in that
Implement step as follows：
Step (1), pre-acquired is carried out to intermediate-freuqncy signal according to pulse synchronous signal, the scope of collection includes a pulse period,
Wherein, it is T for the pulse signal cycle modulated, pulse width is Pw, and if sampling frequency is fs, then pre-acquired points are T/
fs；
Step (2), using FPGA produce with if sampling frequency with frequency sinusoidal signal, points be similarly T/fs, with pre-sampling
Data are multiplied, and thus move to the position of 0 and 2fs the spectral centroid of medium-frequency pulse signal；
Step (3), data are carried out with LPF, retain the spectral line near 0 frequency, filter image frequency and other frequency contents；
Step (4), filtered signal contain the envelope information of pulse signal, its peak value respective pulses signal center point, take
The moment of Amplitude maxima is tm, and because pulse width is Pw, therefore tc=tm-Pw/2 is exactly medium-frequency pulse same relative to pulse
Walk the time delayses of signal；
Step (5), the data acquisition moment is modified, it would be desirable to which the delay time of fixed test adds tc, exactly needs out
Beginning carries out the moment of data acquisition.
3. in a kind of pulse network analyzer pulse as claimed in claim 2 data acquisition synchronous method, it is characterised in that
In the step (3), filter bandwidht is adjusted with the size that spectral line is spaced.
4. in a kind of pulse network analyzer pulse as claimed in claim 3 data acquisition synchronous method, it is characterised in that
In the step (3), spectral line interval delta f is determined by pulse repetition period T, meets Δ f=1/T.
5. in a kind of pulse network analyzer pulse as claimed in claim 4 data acquisition synchronous method, it is characterised in that
Using narrow-band filtering reduction noise jamming, filter bandwidht is set to Δ f, retains first information of spectral line.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109348065A (en) * | 2018-11-27 | 2019-02-15 | 湘潭大学 | A kind of electromagnetic radiation of mobile telephone prediction technique based on QQ chat mutual-action behavior |
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