CN105282086A - Double-tone quadrature measuring method for frequency conversion system group delay - Google Patents
Double-tone quadrature measuring method for frequency conversion system group delay Download PDFInfo
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- CN105282086A CN105282086A CN201510568426.1A CN201510568426A CN105282086A CN 105282086 A CN105282086 A CN 105282086A CN 201510568426 A CN201510568426 A CN 201510568426A CN 105282086 A CN105282086 A CN 105282086A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 230000001629 suppression Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 description 9
- 238000004088 simulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
- H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a double-tone quadrature measuring method for frequency conversion system group delay. A vector signal source generates double-tone signals having a frequency difference of Delta f, by means of a power divider, one of the signals is input into a first A/D converter, the other one of the signals enters into a frequency conversion system after certain attenuation, the output signals of the frequency conversion system serve as the input of a second A/D converter after certain attenuation, during the measurement, the two A/D converters perform sampling synchronously, the input signals and the output signals are subjected to digital quadrature processing after being subjected to A/D sampling, and then two single-tone signals at the frequency of Delta f can be obtained, the group delay values of the frequency conversion system can be obtained by comparing the phases of the single-tone signals of the frequency of Delta f, the measurement of the group delay of the frequency points within the bandwidth of the frequency conversion system can be realized by synchronously changing the frequency values of the double-tone signals under the condition of maintaining the frequency difference Delta f of the double-tone signals unchanged, and the accuracy of the measurement results relays on the estimation accuracy of the phases of the single-tone signals of the frequency of Delta f.
Description
Technical field
The present invention relates to a kind of double-tone orthogonal measuring method of frequency change system group delay, for the accurate measurement of frequency change system group delay.
Background technology
Group delay is the important indicator describing medium and T-R systematic function, with signal through the distortion of system and time delay size closely related.Because the input of frequency conversion system is different from output operating frequency, the measurement of frequency change system group delay is the difficult point in Group Delay Measurement field.Document " Groupdelayandphasemeasurementsatconvertersandmultistagec onverterswithoutLOaccess " (ProceedingsofIEEEInternationalConferenceonMicrowaves, Communications, AntennasandElectronicsSystems, TelAviv, 2009, pp.1-5.) in propose a kind of double-tone Group Delay Measurement method.When utilizing the method to measure the group delay of frequency conversion system, the frequency in local oscillation signal source only need be known, without the need to providing or obtaining any signal relevant with system under test (SUT) local oscillator.But due to the impact of the factors such as device aging and operational environment change, may there is unknown drift in the local frequency of frequency conversion system.The drift of local frequency will affect the certainty of measurement of double-tone method.Especially when utilizing fast Fourier transform (FFT) and innovatory algorithm thereof to carry out digit phase estimation, the drift of local frequency will cause the frequency exporting two-tone signal to be in the non-integral multiple position of algorithm frequency resolution, causes signal spectrum to reveal.When revealing appears in signal spectrum, the estimated value of phase place will be the two-tone signal interactional result of phase place true value separately, and then has a strong impact on the certainty of measurement of group delay.
Summary of the invention
In order to overcome technical disadvantages during existing double-tone method measurement frequency change system group delay, the object of the present invention is to provide a kind of double-tone orthogonal measuring method of frequency change system group delay, this method of measurement and system under test (SUT) local oscillation signal completely irrelevant, overcome the impact of local oscillation signal drift on Group Delay Measurement precision.
Technical solution of the present invention is: by orthogonal processing, and when double-tone method is measured group delay, the estimation of two-tone signal phase difference is converted to the phase estimation that frequency is the tone signal of two-tone signal frequency difference.
In order to achieve the above object, the technical solution used in the present invention is:
The double-tone orthogonal measuring method of frequency change system group delay, comprises the steps:
(1), utilize vector signal source, produce frequency and be respectively f
1and f
2, frequency difference is the two-tone signal of Δ f:
(2), by the two-tone signal of generation be divided into two-way, road input an one A/D converter, another road inputs frequency conversion system after suitably decaying, and using the input as the 2nd A/D converter after necessarily decaying of the output signal of frequency conversion system; Then the input signal of synchronized sampling the one A/D converter and the 2nd A/D converter;
(3), the data that an A/D converter obtains are multiplied by sin (2 π f ' respectively
0t) with cos (2 π f '
0t), wherein f '
0for local frequency during digital mixing process, t is time variable, then utilize in low pass filter filtered signal with frequently (high frequency) part, and ask quadratic sum computing to filtered signal, obtaining is the single-tone reference signal of Δ f than the frequency of phase for numeral
wherein Δ f=f
1-f
2
Wherein: a
1, f
1,
be respectively the amplitude of first sound in input two-tone signal, frequency and phase place; a
2, f
2,
be respectively the amplitude of second sound in input two-tone signal, frequency and phase place; T is time variable;
Carry out the orthogonal processing identical with an A/D converter to the data that the 2nd A/D converter obtains, obtaining is the single-tone measuring-signal of Δ f than the frequency of phase for numeral:
wherein Δ f=f
1-f
2
Wherein: f
1for the frequency of first sound in input two-tone signal; f
2for the frequency of second sound in input two-tone signal; A '
1,
be respectively the phase and magnitude exporting first sound in two-tone signal; A '
2,
be respectively the phase and magnitude exporting second sound in two-tone signal; T is time variable;
(4), the data obtained after asking quadratic sum are deducted its average, to suppress the DC component in data; Then utilize digit phase method of estimation, estimating data medium frequency after carrying out direct current suppression is respectively the phase place of Δ f component
with
and then realize the estimation of group delay:
(5), f is constant for maintenance two-tone signal frequency difference Δ, synchronous change two-tone signal frequency f
1and f
2value, obtain the group delay value of each frequency in frequency conversion system bandwidth.
The present invention compared with prior art has the following advantages:
1, the measurement of frequency change system group delay local oscillator that is complete and system under test (SUT) has nothing to do, and overcomes the impact of local oscillation signal drift on Group Delay Measurement precision.
2, orthogonal processing is passed through, by the estimation problem conversion of the phase difference of two-tone signal during double-tone method measurement frequency change system group delay in order to the phase estimation problem of tone signal, easily the Technology of Precision Measurement of tone signal phase place can be applied to the accurate measurement of frequency change system group delay.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present invention.
Fig. 2 is the waveform of the two-tone signal that in the embodiment of the present invention, vector signal source produces.
Fig. 3 is the waveform of constrained input two-tone signal after orthogonal processing in the embodiment of the present invention.
Fig. 4 is that the precision in the embodiment of the present invention improves design sketch.
Fig. 5 is the improvement design sketch of the measurement variance in the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The double-tone orthogonal measuring method of frequency change system group delay of the present invention, comprises the steps:
1, utilize vector signal source, produce frequency and be respectively f
1and f
2, frequency difference is the two-tone signal of Δ f;
2, then, the two-tone signal of generation is divided into two-way, road input an one A/D converter, another road inputs frequency conversion system after suitably decaying, and using the input as the 2nd A/D converter after necessarily decaying of the output signal of frequency conversion system; The input signal of synchronized sampling two A/D converters.When synchronized sampling, as carried out lack sampling, require the frequency f of input two-tone signal
1and f
2average, frequency conversion system export two-tone signal frequency f '
1with f '
2average be not all sample rate f
sintegral multiple.In addition, sample rate f
smust meet: f
s> 2 Δ f.
3, the data that an A/D converter obtains are multiplied by sin (2 π f ' respectively
0t) with cos (2 π f '
0t), then utilize in low pass filter filtered signal with frequently (high frequency) part, and quadratic sum computing is asked to filtered signal; The orthogonal processing identical with an A/D converter is carried out to the data that the 2nd A/D converter obtains.Sin (2 π f ' are multiplied by for the ease of subsequent filter filtering
0t) with cos (2 π f '
0t) after and frequency component, in non-lack sampling situation, when processing the data of an A/D converter, f '
0be chosen for the value of frequency conversion system input centre frequency, when processing the data of the 2nd A/D converter, f '
0be chosen for the value of frequency conversion system output center frequency; In lack sampling situation, when processing the data of an A/D converter, f '
0be chosen for the value of frequency conversion system input centre frequency divided by sample rate f
safter remainder; When processing the data of the 2nd A/D converter, f '
0be chosen for the value of frequency conversion system output center frequency divided by sample rate f
safter remainder.In addition, constrained input end must utilize identical low pass filter.
4, the data obtained after asking quadratic sum are deducted its average, to suppress the DC component in data; Then utilize digit phase method of estimation, estimating data medium frequency after carrying out direct current suppression is respectively the phase place of Δ f component, and then realizes the estimation of group delay.
5, two-tone signal frequency difference Δ f is maintained constant, synchronous change two-tone signal frequency f
1and f
2value, obtain each frequency group delay value in frequency conversion system bandwidth.
Embodiment
The input centre frequency of the frequency conversion system of simulation is 1225MHz, and corresponding output center frequency is 50MHz.The bandwidth of analogue system is 2MHz, and sample rate is fixed as 1GHz.Ideally, the local oscillation signal frequency of frequency conversion system should be 1075MHz.For the impact that simulation local oscillation signal frequency drift is brought, the frequency of local oscillation signal is set to 1075.0002MHz.
1, simulation produces frequency and is respectively the random two-tone signal of 1224MHz and 1224.01MHz, initial phase, as shown in Figure 2.
2, then, the two-tone signal of generation is divided into two-way, road input an one A/D converter, another road inputs frequency conversion system after suitably decaying, and using the input as the 2nd A/D converter after necessarily decaying of the output signal of frequency conversion system; The input signal of synchronized sampling two A/D converters.
3, f ' is chosen
0the data that one A/D converter obtains are multiplied by sin (2 π f ' by=225MHz respectively
0t) with cos (2 π f '
0t), then through bandwidth be 8MHz quadravalence numeral Butterworth LPF.
4, quadratic sum computing is asked to the signal through low pass filter, and operation result is deducted its average, to suppress DC component.
5, f ' is chosen
0=50MHz, the data obtained the 2nd A/D converter are carried out and step 3,4 identical process.The waveform that input signal and output signal obtain after orthogonal processing as shown in Figure 3.As can be seen from the figure: two-tone signal, after step 2 to the process of step 4, is converted to the tone signal that frequency is 10kHz;
6, utilize fft algorithm to ask for the phase place of the component that final data medium frequency is 10kHz, and then realize the measurement of group delay;
7, the Frequency Synchronization of two-tone signal is increased 10kHz, repeat step 2 ~ 6, and then obtain the group delay in frequency conversion system bandwidth of operation, as shown in Figure 4.As can be seen from the figure: by orthogonal processing, the phase difference measurement of two-tone signal is converted to the phase measurement of tone signal, effectively overcomes the impact of local oscillation signal drift on Group Delay Measurement precision;
8, change the size of local vibration source frequency shift amount, and under specific frequency shift amount, repeat step play 1 ~ 5, obtain the statistics under the drift frequently of different local oscillator, as shown in Figure 5.As can be seen from the figure: when utilizing method of the present invention to measure the group delay of frequency conversion system, certainty of measurement is only determined by the phase estimation precision of tone signal, have nothing to do with the frequency drift of local oscillation signal.
Claims (2)
1. the double-tone orthogonal measuring method of frequency change system group delay, is characterized in that: comprise the steps:
(1) vector signal source is utilized to produce the two-tone signal that frequency difference is Δ f;
(2) be that the two-tone signal of Δ f is divided into two-way by frequency difference, road input an one A/D converter, another road inputs frequency conversion system after decaying, and using the input as the 2nd A/D converter after necessarily decay of the output signal of frequency conversion system; Then the input signal of synchronized sampling the one A/D converter and the 2nd A/D converter;
(3) data that an A/D converter obtains are multiplied by sin (2 π f ' respectively
0t) with cos (2 π f '
0t), wherein f '
0for local frequency during digital mixing process, t is time variable; Then utilize in low pass filter filtered signal with frequency and HFS, and to carry out square summation to the signal after low pass filter, obtaining is the single-tone reference signal of Δ f than the frequency of phase for numeral:
wherein Δ f=f
1-f
2
Wherein: a
1, f
1,
be respectively the amplitude of first sound in input two-tone signal, frequency and phase place; a
2, f
2,
be respectively the amplitude of second sound in input two-tone signal, frequency and phase place; T is time variable;
Carry out the orthogonal processing identical with an A/D converter to the data that the 2nd A/D converter obtains, obtaining is the single-tone measuring-signal of Δ f than the frequency of phase for numeral
wherein Δ f=f
1-f
2
Wherein: f
1the frequency of first sound in input two-tone signal; f
2the frequency of second sound in input two-tone signal; A '
1,
be respectively the phase and magnitude exporting first sound in two-tone signal; A '
2,
be respectively the phase and magnitude exporting second sound in two-tone signal;
(4) data obtained after asking quadratic sum are deducted its average, to suppress the DC component in data; Then utilize digit phase method of estimation, estimating data medium frequency after carrying out direct current suppression is the phase place of Δ f component
with
and then realize the estimation of group delay;
(5) the frequency difference Δ f maintaining two-tone signal is constant, and the frequency values of synchronous change two-tone signal, obtains the group delay value of each frequency in frequency conversion system bandwidth.
2. the double-tone orthogonal measuring method of frequency change system group delay according to claim 1, it is characterized in that: in described step (3), by orthogonal processing, the accurate measurement problem of frequency change system group delay is converted into the precise estimation problem that frequency is the phase place of the tone signal of Δ f.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813962A (en) * | 2018-12-27 | 2019-05-28 | 中电科仪器仪表有限公司 | Frequency conversion system group delay measurement method and system based on Hilbert transform |
| CN113055108A (en) * | 2021-01-18 | 2021-06-29 | 浙江大学 | Method and device for measuring group delay of frequency mixer |
| CN113805182A (en) * | 2021-09-18 | 2021-12-17 | 四川轻化工大学 | Object motion monitoring method based on vector operation |
| CN115865754A (en) * | 2022-11-10 | 2023-03-28 | 成都坤恒顺维科技股份有限公司 | Method and device for measuring dynamic group delay in real time |
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2015
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109813962A (en) * | 2018-12-27 | 2019-05-28 | 中电科仪器仪表有限公司 | Frequency conversion system group delay measurement method and system based on Hilbert transform |
| CN113055108A (en) * | 2021-01-18 | 2021-06-29 | 浙江大学 | Method and device for measuring group delay of frequency mixer |
| CN113055108B (en) * | 2021-01-18 | 2022-06-17 | 浙江大学 | Method and device for measuring group delay of frequency mixer |
| CN113805182A (en) * | 2021-09-18 | 2021-12-17 | 四川轻化工大学 | Object motion monitoring method based on vector operation |
| CN113805182B (en) * | 2021-09-18 | 2023-05-02 | 四川轻化工大学 | Object motion monitoring method based on vector operation |
| CN115865754A (en) * | 2022-11-10 | 2023-03-28 | 成都坤恒顺维科技股份有限公司 | Method and device for measuring dynamic group delay in real time |
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