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CN106199187B - A kind of test method of multi-tone signal relative phase - Google Patents

A kind of test method of multi-tone signal relative phase Download PDF

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CN106199187B
CN106199187B CN201610562796.9A CN201610562796A CN106199187B CN 106199187 B CN106199187 B CN 106199187B CN 201610562796 A CN201610562796 A CN 201610562796A CN 106199187 B CN106199187 B CN 106199187B
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signal
tone
frequency
relative phase
measured
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CN106199187A (en
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游飞
王朋
郝鹏
陈国强
何松柏
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University of Electronic Science and Technology of China
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00Arrangements for measuring phase angle between a voltage and a current or between voltages or currents

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  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
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Abstract

A kind of method of test multi-tone signal relative phase of the disclosure of the invention, is related to the test method of the relative phase of multi-tone signal.A method of test multi-tone signal relative phase, including building test platform, solving two part compositions of relative phase;It is essentially characterized in that each tone components of measured signal are gradually mixed with same broadband signal or the identical broadband signal of multiple baseband frequency spectrum information, and with the intermediate frequency component after sampling instrument acquisition mixing, the relative phase of measured signal is obtained by calculating.The present invention uses broadband signal as mixed frequency signal during down coversion, in subsequent calculating process, with statistical average viewpoint, reduces calculating error.

Description

A kind of test method of multi-tone signal relative phase
Technical field
Modelled signal test method of the present invention, more particularly to the test method of the relative phase of multi-tone signal.
Background technology
As the mankind are to the growing of communication requirement, the communication technology is rapidly sent out towards the direction of multiband big data quantity Exhibition, measuring the instrument and method of communication system, there has also been rapid progresses.Multi-tone signal is usually applied in various communication systems, example Such as, the local oscillation signal of the compressed sensing receiver based on MWC frameworks can be regarded as having the multitone at fixed frequency interval to believe Number.However the relative phase for measuring multi-tone signal annoyings always the researcher of related field, becomes the important of related scientific research Project.
It is directly measured, with the mode of mixing with frequency spectrograph currently, the main test method of multi-tone signal relative phase has Measure indirectly etc..For common frequency spectrograph since its local oscillation signal is there are random phase, sampling first phase has uncertainty, thus nothing Method accurately measures the absolute phase of signal.If the spectral range that the multi-tone signal of test is distributed is relatively narrow, it is no more than frequency spectrum The intermediate-frequency filter bandwidth of instrument, the frequency of adjustment frequency spectrograph inside down coversion, all sounds of multi-tone signal can be by frequency spectrograph one Secondary property all return by sampling, can thus calculate the relative phase between each sound of multi-tone signal.But if multi-tone signal institute The spectral range of distribution is wider, be more than frequency spectrograph intermediate-frequency filter bandwidth, relative phase cannot enough frequency spectrographs directly survey Amount.Another test method is to measure indirectly, generates the multi-tone signal of relative phase known to one group as local oscillator, and to be measured more Sound signal is mixed, adjust each sound ingredient of local oscillator frequency, ensure each sound of measured signal ingredient can be mixed to compared with Low IF frequency, and each sound does not generate aliasing in intermediate frequency, and the signal after mixing can pass through ADC devices or frequency spectrograph one Secondary property samples simultaneously, and the relative phase of multi-tone signal can be obtained by calculating.But if measured signal multitone ingredient too It is more, and it is distributed very wide frequency band, it is known that the multitone local oscillation signal of relative phase is not easy to generate, it is difficult to by each of measured signal After sound ingredient is down-converted to intermediate frequency simultaneously, and carries out disposable while sampling calculating.
The measured signal that the test method of multi-tone signal relative phase proposed by the present invention is applicable in has the characteristics that:Often One tone components is stablized relatively, and signal integrally shows apparent periodicity, and multi-tone signal spectrum distribution is relatively wide, Tone components are relatively more, can not directly be measured by above-mentioned measurement method.The present invention is used establishes unification to multi-tone signal Reference data, each tone components measure respectively, finally obtain relative phase according to sampled value calculation processing.The present invention both overcame Spectrum distribution to be measured narrow weakness when direct frequency spectrograph measures, but overcome measure indirectly local oscillation signal be difficult to generate it is weak Point can test the relative phase for the sophisticated signal that multitone ingredient is more and frequency is relatively wide.Also, the present invention is in down coversion During, use broadband signal as mixed frequency signal, in subsequent calculating process, with statistical average viewpoint, Reduce calculating error.
Invention content
The object of the present invention is to provide a kind of method of test multi-tone signal relative phase information, indirectly testing goes out frequency point Cloth is wider, multitone ingredient compared with multi signal relative phase.
The technical scheme is that:A method of test multi-tone signal relative phase, including building test platform, asking Two parts of relative phase are solved to form;It is essentially characterized in that each tone components of measured signal gradually with same broadband signal or The identical broadband signal mixing of the multiple baseband frequency spectrum information of person passes through calculating with the intermediate frequency component after sampling instrument acquisition mixing Obtain the relative phase of measured signal.
Thus a kind of method of test multi-tone signal relative phase of the present invention, this method include:
Step 1:Measured signal is divided into two-way, all the way by accessing frequency mixer local oscillator end after the first gain control unit Mouthful, another way accesses trigger signal generator;
Step 2:Trigger signal generator counts the period of this measured signal, every N number of according to the measured signal of feeding Period generates a trigger signal, and the value of N is determined according to the period of ADC sampling lengths and multi-tone signal;Trigger signal point For two-way, it is respectively fed to detection signal generator and ADC sampler part;
Step 3:It is sent into the trigger signal of detection signal generator, control detection signal generator repeats to generate broadband letter Number, the carrier frequency of this broadband signal is adjusted, keeps the frequency of one of itself and measured signal tone components corresponding, then says The broadband signal is by accessing frequency mixer prevention at radio-frequency port after the second gain control unit;
Step 4:After the intermediate-freuqncy signal that frequency mixer generates is filtered by low-pass filter, it is sent into ADC sampler;Pass through feeding The another way trigger signal of ADC sampler part, the timing node of control ADC sampler part record sampled data;Whenever ADC is sampled As soon as device often receives a trigger signal, the sampled data of certain length is recorded;
Step 5:The corresponding sample sequence value of i-th of tone components is denoted as yi[n], to yi[n] does Fourier transformation, obtains Yi(f), it arbitrarily chooses the corresponding sample sequence of wherein a-th of tone components to be used as the standard of referring to, is set as ya[n], is in Fu it Leaf transformation obtains Ya(f), 1 operation of formula is done
Wherein θ is the phase difference of i-th of tone components and a-th of tone components.
Here special to this for testing the Fourier coefficient of the compressed sensing receiver local oscillation signal based on MWC frameworks The test method that profit is proposed illustrates.Compressed sensing receiver local oscillation signal based on MWC frameworks is the puppet of a high speed Random series, the pseudo-random sequence are repeated with M bit, and therefore, it shows as equally spaced multitone on frequency domain Signal.Its coverage area covers very wide, few then hundreds of MHz at most more than ten GHz in practical applications.Since channel and mixing etc. are non- The presence of desirable factors, Fourier coefficient occurs the presence of distortion, thus Fourier coefficient cannot be obtained by calculation, and needs to it It is tested, can accurately recover signal.But it is difficult to take the method handle once sampled with current test method Fourier coefficient so in wide frequency ranges directly tests out, it is also difficult to generate a kind of multi-tone signal progress of known phase Mixing test.But this patent mentions indirect test method and can solve the problems, such as this, finds out the opposite of each Fourier coefficient Value.In experiment, what we tested is with the equally spaced multi-tone signals of 40MHz (pseudo-random sequence of compressed sensing receiver) in frequency The rate ranging from Fourier coefficient of 1800MHz-2000MHz.Have in this frequency range 1800MHz, 1840MHz, 1880MHz, Six spectrums of 1920MHz, 1960MHz, 2000MHz.It is reference with 1880MHz, the amplitude of its Fourier coefficient is set as 1, phase It is set as 0.After test, the relative amplitude of other spectrums is as shown in figure 5, relative phase is as shown in Figure 6.Each frequency point tests 20 times, In terms of test result, the result fluctuation very little tested every time illustrates that test is to stablize to repeat, also demonstrates test result Reliability.
Description of the drawings
Fig. 1 is that multi-tone signal relative phase of the present invention tests system block diagram;
Fig. 2 is the frequency domain characteristic of multi-tone signal to be measured;
Fig. 3 is the frequency domain characteristic of test signal;
Fig. 4 is the signal IF_1 after low-pass filter;
Fig. 5 multi-tone signal Fourier coefficient relative amplitudes;
Fig. 6 multi-tone signal Fourier coefficient relative phases.
Specific implementation mode
Present invention combination attached drawing further illustrates;Instrument device used in the present invention, including measuring signal generator, touch Signalling generator, gain control unit (wide-band linearity), frequency mixer, low-pass filter, ADC sampler part and data processing Calculating instrument.Its system block diagram is as shown in Figure 1.
It is a kind of test multi-tone signal relative phase method the specific steps are:
1, it presses shown in system block diagram 1, builds measuring table.
2, measured signal is defaulted as the relative phase of multi-tone signal, will using coupler if multiple tone signals need to be measured Multiple tone signals are coupled into multi-tone signal.
3, it by signal generator, trigger signal generator, the ADC sampler part in test platform, is synchronized into row clock.
4, multi-tone signal is divided into two-way, all the way by gain control unit after, access the local oscillator port of frequency mixer, it is another Trigger signal generator is accessed on road.
5, trigger signal generator counts the period of this multi-tone signal according to the multi-tone signal of feeding, every N number of period A trigger signal is generated, the value of N is determined according to the period of ADC sampling lengths and multi-tone signal.Trigger signal is divided into two Road is respectively fed to signal generator and ADC sampler part.
6, it is sent into the trigger signal of signal generator, control signal generator repeats to generate broadband signal, i.e. signal occurs Device often receives trigger signal, will regenerate the identical broadband signal of base-band information, adjust the load of this broadband signal Wave frequency rate, makes corresponding with the frequency of one of multi-tone signal to be measured tone components, its intermediate frequency component can pass through after mixing Low-pass filter, at this time intermediate frequency component contain the phase information of this tone signal.
7, after the broadband signal for generating signal generator is by gain control unit, it is sent into the prevention at radio-frequency port of frequency mixer, And be mixed with assertive evidence signal, be mixed generation intermediate-freuqncy signal filtered by low-pass filter after, be sent into ADC sampler part Analog input end.
8, the another way trigger signal of ADC sampler part, the when segmentum intercalaris of control ADC sampler part record sampled data are sent into Point.As soon as that is, whenever ADC sampler part receives a trigger signal, the sampled data of certain length is recorded.
9, step 5-7 is repeated, the carrier frequency for all changing the step the broadband signal in 5 is repeated every time, believes with multitone to be measured Number a tone components correspond to, until all tone components are all measured by corresponding.
10, by multigroup sampled data of record, the relative phase of multi-tone signal is calculated using correlation computations tool.Tool Body calculating process is:The corresponding sample sequence value of i-th of tone components is denoted as yi[n], to yi[n] does Fourier transformation, obtains Yi (f), it arbitrarily chooses the corresponding sample sequence of wherein a-th of tone components to be used as the standard of referring to, is set as ya[n], is in Fu it Leaf transformation obtains Ya(f), 1 operation of formula is done
Wherein θ is the phase difference of i-th of tone components and a-th of tone components (reference value).
Its principle is as follows, and measured signal SS is multi-tone signal, measures multiple tone signals if needed, and coupler can be used It is first coupled to obtain multi-tone signal.The characteristics of its multi-tone signal to be measured, is that each tone components is stablized relatively, signal Entirety shows apparent periodicity, and multi-tone signal spectrum distribution is relatively wide, and tone components will be to more, signal representation Form is
In formula (2), Ai, i=1,2 ... n are real number, the amplitude of the Fourier coefficient after representation signal Fourier transformation, θi, i=1,2 ... n do not represent the phase of Fourier coefficient, fi, i=1,2 ... n respectively represent the load of each tone components in signal Wave frequency rate.The purpose of the present invention is exactly the relative value found out between each θ.
The forms of expression of the signal SS on frequency domain, as shown in arrow in schematic diagram Fig. 2.
In system block diagram 1, in order to ensure the synchronism of whole system, we by signal source, trigger signal generator, with And ADC sampler part is synchronized into row clock.Measured signal SS is divided into two-way first, all the way by by low noise and attenuator group At gain control unit, its amplitude is adjusted to suitable range and obtains SS1=G1* ss, wherein G1For gain coefficient.By SS1 Access the local oscillator input terminal of frequency mixer.Since measured signal is multi-tone signal, so SS is periodic signal.Another branch of SS Trigger signal generator is accessed on road, and trigger signal generator records the periodicity of SS signals, every N number of period, sends out one and touches It signals, the value of N is determined according to the period of ADC sampling lengths and multi-tone signal.Trigger signal is admitted to signal source and ADC Sampling device.Detection signal is the Broad-band Modulated Signal that signal bandwidth is B.Signal source receives trigger signal every time, always produces The identical detection signal of raw base-band information, carrier frequency can adjust variation.The carrier frequency of detection signal is adjusted first Rate is f1-fa, the expression formula for detecting signal is:
Wherein, B/2<fa<fp- B/2, fpFor the cutoff frequency of low-pass filter.At this point, the form of expression is such as on frequency domain by RF1 It is trapezoidal shown in Fig. 3.RF1 is by the gain control unit that is made of low noise and attenuator, by its power adjustment to suitable Range, the signal RF1_a=G after adjustment2* RF1, wherein G2For gain coefficient.RF1_a is sent into the prevention at radio-frequency port of frequency mixer, warp After crossing frequency mixer, measured signal is in frequency f1The phase information for locating tone components, is included in intermediate frequency faIn the frequency spectrum at place, pass through By f after low-pass filteraThe frequency spectrum at place takes out, it is assumed that conversion gain is to assume G3It is filtered for conversion gain Signal IF_1 expression formulas afterwards are as follows:
Since system has carried out the synchronous periodicity synchronous and local oscillation signal with triggering of clock, join in each test sample It is duplicate with the local oscillator state being mixed, the carrier frequency for the test signal that adjustment signal generates is f2-fa, with letter to be measured Number a tone components f2Corresponding, test signal expression formula is:
By gain control unit, mixing, filtering, the form of expression of the intermediate frequency on frequency domain can be obtained as shown in figure 4, its Expression formula is:
The carrier frequency of test signal is adjusted, aforesaid operations are repeated, until tone components all surveys that measured signal is all It is complete.
Here only doing ratio to the positive frequency spectrum of IF_1 and IF_2 can obtain:
We just find in frequency f in this way1And f2Locate the relative phase θ of tone components12.It should be pointed out that using formula (8) method of the plural ratio expressed by can obtain preferable noiseproof feature, and relative phase is still θ12

Claims (1)

1. a kind of method of test multi-tone signal relative phase, this method include:
Step 1:Measured signal is divided into two-way, all the way by accessing frequency mixer local oscillator port after the first gain control unit, separately Trigger signal generator is accessed all the way;
Step 2:Trigger signal generator counts the period of this measured signal according to the measured signal of feeding, every N number of period A trigger signal is generated, the value of N is determined according to the period of ADC sampling lengths and multi-tone signal;Trigger signal is divided into two Road is respectively fed to detection signal generator and ADC sampler part;
Step 3:It is sent into the trigger signal of detection signal generator, control detection signal generator is repeated to generate broadband signal, be adjusted The carrier frequency of this whole broadband signal keeps the frequency of one of itself and measured signal tone components corresponding, then by the width Band signal is by accessing frequency mixer prevention at radio-frequency port after the second gain control unit;
Step 4:After the intermediate-freuqncy signal that frequency mixer generates is filtered by low-pass filter, it is sent into ADC sampler;By being sent into ADC The another way trigger signal of Sampling device, the timing node of control ADC sampler part record sampled data;Whenever ADC sampler As soon as part often receives a trigger signal, the sampled data of certain length is recorded;
Step 5:The corresponding sample sequence value of i-th of tone components is denoted as yi[n], to yi[n] does Fourier transformation, obtains Yi (f), it arbitrarily chooses the corresponding sample sequence of wherein a-th of tone components to be used as the standard of referring to, is set as ya[n], is in Fu it Leaf transformation obtains Ya(f), 1 operation of formula is done
Wherein θ is the phase difference of i-th of tone components and a-th of tone components.
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CN106707238A (en) * 2016-12-27 2017-05-24 国网辽宁省电力有限公司电力科学研究院 Transmission conductor wind noise source observation system and transmission conductor wind noise source observation method
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CN111478738B (en) * 2020-04-10 2022-08-02 中国人民解放军国防科技大学 Array receiver channel mismatch measurement method based on multi-tone signal
CN111610377A (en) * 2020-04-27 2020-09-01 宁波锐眼电子科技有限公司 Antenna test system, method, millimeter wave radar, and computer-readable storage medium

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CN101263742A (en) * 2005-09-13 2008-09-10 皇家飞利浦电子股份有限公司 Audio coding
CN102137412A (en) * 2010-10-27 2011-07-27 清华大学 Method for evaluating phase noise of time-division multiplexing switching channel measuring instrument
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US4412299A (en) * 1981-02-02 1983-10-25 Teltone Corporation Phase jitter detector
EP1890417A1 (en) * 1997-10-08 2008-02-20 Matsushita Electric Industrial Co., Ltd. Digital phase discrimination based on frequency sampling
CN101263742A (en) * 2005-09-13 2008-09-10 皇家飞利浦电子股份有限公司 Audio coding
CN101018427A (en) * 2006-02-08 2007-08-15 许光智 Sound wave phase equalization circuit of mobile-loop speaker
CN102137412A (en) * 2010-10-27 2011-07-27 清华大学 Method for evaluating phase noise of time-division multiplexing switching channel measuring instrument
CN103973321A (en) * 2013-02-06 2014-08-06 中国电子科技集团公司第十研究所 Method for increasing flexibility of multi-tone frequency modulated signal receiver

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