CN103913633A - High-spectrum-resolution phase spectrum measuring device and method based on multi-frequency sinusoidal signals - Google Patents
High-spectrum-resolution phase spectrum measuring device and method based on multi-frequency sinusoidal signals Download PDFInfo
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Abstract
The invention relates to the technical field of radio frequency microwave signal measurement and discloses a high-spectrum-resolution phase spectrum measuring device based on multi-frequency sinusoidal signals. The High-spectrum-resolution phase spectrum measuring device comprises a multi-frequency sinusoidal signal generation module, a phase difference measuring module, a system calibration module and a calculation module, wherein the multi-frequency sinusoidal signal generation module is used for generating the multi-frequency sinusoidal signals; the phase difference measuring module is used for being provided with a plurality of tested frequency points, receiving tested signals and calculating the phase difference measurement results of the tested signals and the multi-frequency sinusoidal signals; the system calibration module is used for performing system calibration on the phase different measuring module and acquiring the phase measurement errors at all the tested frequency points; the calculation module is used for calculating the phase spectrum of the test signals according to the error correction method, the measurement results of the system calibration module and the measurement results of the phase difference measuring module. The invention further discloses a high-spectrum-resolution phase spectrum measuring method based on multi-frequency sinusoidal signals. The high-spectrum-resolution phase spectrum measuring device and method based on multi-frequency sinusoidal signals break through the technical bottleneck and the index limit of an existing harmonic wave scheme, and kHz level high-spectrum-resolution phase measurement on the GHz frequency band is achieved.
Description
Technical field
The present invention relates to frequency microwave signal measurement technique field, particularly high frequency spectrum resolution phase spectrum measurement mechanism and the method based on multifrequency sine signal.
Background technology
Non-linear vector network analyzer NVNA is upgrading and the transformation on vector network analyzer VNA basis, by introducing extra phase reference signal (at present by pulse producer impulse generator, also claim comb generator comb generator to provide), realize the measurement of the latter's phase spectrum according to the phase differential of reference signal and measured signal, as shown in Figure 1.This measurement means requires the spectrum component of reference signal to cover whole frequencies of measured signal, and the power of every spectral line meets measures requirement (being generally not less than-100dBm), and the frequency that can not cover for reference signal cannot effectively be measured.Existing commercial NVNA product adopts " time domain narrow pulse signal " for phase reference is provided, and (be rated for 10MHz, Frequency point is 10MHz to the inverse that its spectral resolution is the pulse repetition time, 20MHz, 30MHz ...), a kind of harmonic signal, as shown in Figures 2 and 3.Along with the raising of spectral resolution, the repetition period of pulse needs to increase, and causes average power significantly to reduce, and the energy of each spectral line can not meet measures requirement (generally need be greater than-100dBm).Therefore, there is the bottleneck of spectral resolution in this technical scheme: spectral resolution at present that be difficult to provide kHz rank in ghz band, in the time that the spectrum intervals of measured signal is kHz rank, this reference signal scheme cannot cover all tested frequencies with enough energy, thereby can not effectively measure.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of high frequency spectrum resolution phase spectrum measurement mechanism and method based on multifrequency sine signal.
For solving the problems of the technologies described above, the invention provides a kind of high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal, comprising: multifrequency sine signal generating module, for generation of multifrequency sine signal; Phase difference measurement module, for being set up multiple tested frequencies, and receives measured signal, calculates the phase difference measurement result of measured signal and described multifrequency sine signal; System calibration module, for described phase difference measurement module is carried out to system calibration, obtains the phase measurement error on described each tested frequency; Computing module, for according to the measurement result of the measurement result of error correcting method, described system calibration module and described phase difference measurement module, calculates the phase spectrum of measured signal.
Further, described multifrequency sine signal generating module comprises the programmable signal generating means of vector signal generator or AWG (Arbitrary Waveform Generator) or other independent developments.
Further, it is characterized in that, described phase difference measurement module comprises the device that can be used for multiple signals phase difference measurement of vector network analyzer or hyperchannel oscillograph or other independent developments.
Further, described in, be set up multiple tested frequencies and be less than or equal to the parameter that produces multifrequency sine signal setting.
Further, the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal, also comprises read module, for read the phase difference measurement result of measured signal and described multifrequency sine signal in described phase difference measurement module.
The present invention also provides the measuring method based on the described high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal, comprising:
Step 10, in described phase difference measurement module, multiple tested frequencies are set, receive the multifrequency sine signal of measured signal and the output of multifrequency sine signal generating module simultaneously;
Step 20, in described multifrequency sine signal generating module, multifrequency sine signal is set, calculates the phase difference measurement result of described measured signal and described multifrequency sine signal;
Step 30, carry out system calibration by described system calibration module, obtain the phase measurement error on described each tested frequency;
Step 40, according to the measurement result of the measurement result of error correcting method, described step 20 and 30, calculate the phase spectrum of measured signal.
Further, described multifrequency sine signal generating module comprises vector signal generator or AWG (Arbitrary Waveform Generator), or the programmable signal generating means of other independent developments.
Further, it is characterized in that, described phase difference measurement module comprises vector network analyzer, or hyperchannel oscillograph, or the device that can be used for multiple signals phase difference measurement of other independent developments.
Further, described in, be set up multiple tested frequencies and be less than or equal to the parameter that produces multifrequency sine signal setting.
Further, the method is also included in the phase difference measurement result that reads measured signal and described multifrequency sine signal in described phase difference measurement module.
High frequency spectrum resolution phase spectrum measurement mechanism and method based on multifrequency sine signal provided by the invention avoided the contradiction between " spectral resolution and spectral line power " in existing harmonic wave scheme, it is the problem that reference signal spectral line power does not reduce with the raising of spectral resolution, use the multifrequency sine signal of arrowband to realize phase spectrum measurement as phase reference (having replaced existing harmonic wave scheme), thereby the technical bottleneck and the index limit that break through existing harmonic wave scheme realize the phase measurement of kHz level high frequency spectrum resolution in ghz band.
Brief description of the drawings
Fig. 1 is that existing commercial nonlinear networksanalysis instrument NVNA forms block diagram;
Fig. 2 is time domain narrow pulse signal schematic diagram, and wherein the repetition period of pulse train is T;
Fig. 3 is the broadband harmonic spectrum diagram that time domain narrow pulse signal is corresponding, and spectral resolution is the inverse of repetition cycle T, and the Frequency point of covering is Δ f, 2 Δ f, and 3 Δ f ...;
Fig. 4 is the frequency domain amplitude spectrum schematic diagram of multifrequency sine signal; Wherein, multifrequency sine signal is that a kind of multi-frequency of arrowband becomes sub-signal, and its spectral resolution can reach 0.1kHz～1000kHz;
The structured flowchart of a kind of high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal that Fig. 5 provides for the embodiment of the present invention.
Embodiment
For the phase measurement application of 0.1～1000kHz high frequency spectrum resolution, technological means of the present invention is to adopt the multifrequency sine multisine signal (as Fig. 4) of arrowband that phase reference is provided, the reference spectral line of 0.1～1000kHz high frequency spectrum resolution, be not less than-60dBm of power is provided according to testing requirement, by measuring this multifrequency sine signal and the measured signal phase differential at each frequency, through necessary system calibration and error correction, obtain the phase spectrum of measured signal, as shown in Figure 5.
Referring to Fig. 5, a kind of high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal that the embodiment of the present invention provides, comprising: multifrequency sine signal generating module, phase difference measurement module, system calibration module and computing module.Wherein, multifrequency sine signal generating module is for generation of multifrequency sine signal.In actual applications, multifrequency sine signal generating module is measured required multifrequency sine signal for providing, and requires to cover the Frequency point that all measurements are concerned about simultaneously.Specifically can use vector signal generator VSG or AWG (Arbitrary Waveform Generator) AWG (also claiming arbitrary-function generator AFG), also can realize by the signal generation apparatus of other self-controls or assembling.Multifrequency sine signal is that a kind of broad sense " anharmonic wave " multi-frequency becomes sub-signal, is not only the special circumstances at equifrequent interval.Because VSG and the available multifrequency sine signal frequency of AWG interval can reach 100Hz～1MHz rank, and the energy of each spectral line not with the adjustment of resolution change (can remain at-more than 60dBm, meet to measure and require), therefore can realize the phase measurement of kHz level high frequency spectrum resolution in ghz band.Phase difference measurement module is used for being set up multiple tested frequencies, and receives measured signal, calculates the phase difference measurement result of measured signal and described multifrequency sine signal.Be concerned about the phase differential on frequency owing to will obtaining multifrequency sine signal and measured signal in all measurements, specifically can use vector network analyzer VNA, or hyperchannel oscillograph, also can realize by the measurement mechanism of other self-controls or assembling.System calibration module, for described phase difference measurement module is carried out to system calibration, obtains the phase measurement error on described each tested frequency.Computing module, for according to the measurement result of the measurement result of error correcting method, system calibration module and described phase difference measurement module, calculates the phase spectrum of measured signal.Wherein, system calibration and error correcting method are disclosed technology, comprising: by measuring in advance the standard signal that phase spectrum is known, obtain the intrinsic systematic error between phase difference measurement value and measured signal phase spectrum actual value, and then compensate and revise in follow-up measuring process.Related content can refer to list of references:
[1]J.B.Scott,P.S.Blockley,A.E.Parker,“A?new?instrument?architecture?for?millimeter-wave?time-domain?signal?analysis,”63rd?ARFTG?Conference,pp.47–51,2004.
[2]P.Blockley,J.Scott,“Mixer-Based,Vector-Corrected,Vector?Signal/Network?Analyzer?Offering300kHz-20GHz?Bandwidth?and?Traceable?Phase?Response,”2005IEEE?MTT-S?International?Microwave?Symposium?Digest,pp.1497-1500,Jun2005.
[3]W.V.Moer,Y.Rolain,“A?Large-Signal?Network?Analyzer:Why?Is?It?Needed”,IEEE?Microwave?Magazine,pp.46-61Dec2006
[4]Maoliu?Lin,Yichi?Zhang.“Covariance-matrix-based?uncertainty?analysis?for?NVNA?measurements,”IEEE?Trans.Instrum.Meas.,vol.61,no.1,pp.93-102,Jan.2012.
[5]Michael?Hiebel.Fundamentals?of?Vector?Network?Analyzer.
Said apparatus also comprises read module, for read the phase difference measurement result of measured signal and described multifrequency sine signal in described phase difference measurement module.
The embodiment of the present invention also provides the measuring method of the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal, comprising:
Step 10, in described phase difference measurement module, multiple tested frequencies are set, receive the multifrequency sine signal of measured signal and the output of multifrequency sine signal generating module simultaneously; Wherein, be set up multiple tested frequencies and be less than or equal to the parameter that produces multifrequency sine signal setting.
Step 20, in described multifrequency sine signal generating module, multifrequency sine signal is set, calculates the phase difference measurement result of described measured signal and described multifrequency sine signal;
Step 30, carry out system calibration by described system calibration module, obtain the phase measurement error on described each tested frequency;
Step 40, according to the measurement result of the measurement result of error correcting method, described step 20 and 30, calculate the phase spectrum of measured signal.
The measuring method of the high frequency spectrum resolution phase spectrum measurement mechanism based on the multifrequency sine signal embodiment of the present invention being provided below in conjunction with following examples is described further.
Embodiment mono-
Situation taking measured signal as " carrier frequency 2.4GHz, spectral resolution 1kHz, modulation band-width 50kHz " is as example, existing NVNA commercial product can not be realized the measurement of 51 tested frequency phase spectrums because the phase reference spectral line of 2.4GHz " 1kHz spectral resolution, be not less than-100dBm power " near cannot be provided, and adopts technical scheme of the present invention need to carry out following operation:
Adopt VSG and vector network analysis VNA, build as shown in Figure 5 measuring system.
Step 10, on VNA, arrange 51 tested frequency: 2.4GHz, 2.4GHz ± 1kHz, 2.4GHz ± 2kHz ..., 2.4GHz ± 25kHz.
Step 20, identical parameter is set on VSG, centre frequency is provided is that 2.4GHz, spectrum intervals are that 1kHz, number of frequencies are 51, the multifrequency sine signal of each spectral line power-50dBm.
Step 30, system calibration module are carried out system calibration according to document [1-5], obtain the phase measurement error on each tested frequency.
The phase difference measurement result of measured signal and multifrequency sine signal is read in step 40, access measured signal on VNA.
Step 50, according to the measurement result of the error correcting method of document [1-5] and step 30 and 40, calculate the phase spectrum of measured signal.
Embodiment bis-
Taking the two tone test of power amplifier as example, if requirement of experiment is measured " centre frequency 5.8GHz, double-tone interval is followed successively by 100kHz, 200kHz, 400kHz " 3 rank intermodulation output phases spectrums, existing NVNA commercial product is because cannot provide near " the 50kHz spectral resolution of 5.8GHz, be not less than-100dBm power " phase reference spectral line and can not realize 5.8GHz ± 50kHz, 5.8GHz ± 100kHz, 5.8GHz ± 150kHz, 5.8GHz ± 200kHz, 5.8GHz ± 300kHz, 5.8GHz ± 600kHz amounts to the measurement of 12 tested frequency phase spectrums, and adopt technical scheme of the present invention need to carry out following operation:
Adopt AWG AWG (Arbitrary Waveform Generator) and VNA, build as shown in Figure 5 measuring system.
Step 10, on VNA, arrange 25 uniformly-spaced scan frequency: 5.8GHz, 5.8GHz ± 50kHz, 5.8GHz ± 100kHz, 5.8GHz ± 150kHz ..., 5.8GHz ± 600kHz, wherein 5.8GHz ± 50kHz, 5.8GHz ± 100kHz, 5.8GHz ± 150kHz, 5.8GHz ± 200kHz, 5.8GHz ± 300kHz, 5.8GHz ± 600kHz are 12 effective tested frequencies.
Step 20, to utilize AWG to generate frequency be 5.8GHz ± 50kHz, 5.8GHz ± 100kHz, 5.8GHz ± 150kHz, 5.8GHz ± 200kHz, 5.8GHz ± 300kHz, 5.8GHz ± 600kHz, each spectral line power-30dBm multifrequency sine signal.
Step 30, system calibration module are carried out system calibration according to document [1-5], obtain the phase measurement error on each tested frequency.
Step 40, by power amplifier output terminal connect measuring system.
Step 50, for power amplifier provides the double-tone excitation of 5.8GHz ± 50kHz (100kHz interval), on VNA, read the phase difference measurement value of four effective frequencies of 5.8GHz ± 50kHz, 5.8GHz ± 150kHz (3 rank intermodulation frequency point); According to the calibration result correction respective tones point measurement value of the error correcting method of document [1-5] and step 30, calculate 3 rank intermodulation output phase spectrums in this situation.
Step 60, for power amplifier provides the double-tone excitation of 5.8GHz ± 100kHz (200kHz interval), on VNA, read the phase difference measurement value of four effective frequencies of 5.8GHz ± 100kHz, 5.8GHz ± 300kHz (3 rank intermodulation frequency point); According to the calibration result correction respective tones point measurement value of the error correcting method of document [1-5] and step 30, calculate 3 rank intermodulation output phase spectrums in this situation.
Step 70, for power amplifier provides the double-tone excitation of 5.8GHz ± 200kHz (400kHz interval), on VNA, read the phase difference measurement value of four effective frequencies of 5.8GHz ± 200kHz, 5.8GHz ± 600kHz (3 rank intermodulation frequency point); According to the calibration result correction respective tones point measurement value of the error correcting method of document [1-5] and step 30, calculate 3 rank intermodulation output phase spectrums in this situation.
High frequency spectrum resolution phase spectrum measurement mechanism and method based on multifrequency sine signal provided by the invention avoided the contradiction between " spectral resolution and spectral line power " in existing harmonic wave scheme, it is the problem that reference signal spectral line power does not reduce with the raising of spectral resolution, use the multifrequency sine signal of arrowband to realize phase spectrum measurement as phase reference (having replaced existing harmonic wave scheme), thereby the technical bottleneck and the index limit that break through existing harmonic wave scheme realize the phase measurement of kHz level high frequency spectrum resolution in ghz band.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal, is characterized in that, comprising:
Multifrequency sine signal generating module, for generation of multifrequency sine signal;
Phase difference measurement module, for being set up multiple tested frequencies, and receives measured signal, calculates the phase difference measurement result of measured signal and described multifrequency sine signal;
System calibration module, for described phase difference measurement module is carried out to system calibration, obtains the phase measurement error on described each tested frequency;
Computing module, for according to the measurement result of the measurement result of error correcting method, described system calibration module and described phase difference measurement module, calculates the phase spectrum of measured signal.
2. the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal according to claim 1, is characterized in that, described multifrequency sine signal generating module comprises vector signal generator or AWG (Arbitrary Waveform Generator).
3. the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal according to claim 1, is characterized in that, described phase difference measurement module comprises vector network analyzer, or hyperchannel oscillograph.
4. the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal according to claim 1, is characterized in that, described in be set up multiple tested frequencies and be less than or equal to the parameter that produces multifrequency sine signal setting.
5. according to the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal described in claim 1-4 any one, it is characterized in that, also comprise:
Read module, for reading the phase difference measurement result of measured signal and described multifrequency sine signal in described phase difference measurement module.
6. the measuring method based on the high frequency spectrum resolution phase spectrum measurement mechanism based on multifrequency sine signal described in claim 1, is characterized in that, comprising:
Step 10, in described phase difference measurement module, multiple tested frequencies are set, receive the multifrequency sine signal of measured signal and the output of multifrequency sine signal generating module simultaneously;
Step 20, in described multifrequency sine signal generating module, multifrequency sine signal is set, calculates the phase difference measurement result of described measured signal and described multifrequency sine signal;
Step 30, carry out system calibration by described system calibration module, obtain the phase measurement error on described each tested frequency;
Step 40, according to the measurement result of the measurement result of error correcting method, described step 20 and 30, calculate the phase spectrum of measured signal.
7. method according to claim 6, is characterized in that, described multifrequency sine signal generating module comprises vector signal generator or AWG (Arbitrary Waveform Generator).
8. method according to claim 6, is characterized in that, described phase difference measurement module comprises vector network analyzer, or hyperchannel oscillograph.
9. method according to claim 6, is characterized in that, described in be set up multiple tested frequencies and be less than or equal to the parameter that produces multifrequency sine signal setting.
10. according to the method described in claim 6-9 any one, it is characterized in that, also comprise:
In described phase difference measurement module, read the phase difference measurement result of measured signal and described multifrequency sine signal.
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| CN105115622A (en) * | 2015-08-12 | 2015-12-02 | 合肥工业大学 | Denoising algorithm of fiber Raman temperature sensing system based on independent component analysis |
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| CN107884621A (en) * | 2017-10-11 | 2018-04-06 | 中国计量科学研究院 | The non-linear vector network analyzer measuring method and device of quarter-phase reference |
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| CN109116111A (en) * | 2018-09-05 | 2019-01-01 | 山东交通学院 | A kind of high-precision phase position difference measurements method and circuit |
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| CN110568063A (en) * | 2019-09-16 | 2019-12-13 | 天津工业大学 | Multi-frequency excitation eddy current field phase gradient spectrum nondestructive testing method and system |
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