CN106992818A - A kind of phase generated carrier demodulation device and method program control based on phase - Google Patents
A kind of phase generated carrier demodulation device and method program control based on phase Download PDFInfo
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Abstract
The invention discloses a kind of phase generated carrier demodulation device and method program control based on phase, on the basis of sampling clock, the analog-to-digital conversion to interference signal and 1 frequency multiplication carrier signal is synchronously completed, two signals are subjected to phase alignment；Interference signal after alignment with 1 frequency multiplication carrier signal and 2 frequency multiplication carrier signals transmit to demodulation module after mixing and LPF respectively to be demodulated to it, to realize the demodulation for measured signal.Collection interference signal and 1 frequency-doubled signal in real time of the invention, track the phase difference of 2 road signals, and according to the corresponding collection point position adjustment carrier signal of peak point and 1 frequency-doubled signal, the phase difference of 2 frequency-doubled signals, not only solve interference signal and frequency-doubled signal passes through different light paths problem asynchronous with the phase that circuit is brought, and the random change of phase caused by carrier frequency drift is eliminated to the adverse effect of demodulation result, improve demodulation accuracy.
Description
Technical field
The invention belongs to phase generated carrier demodulation field, more particularly to a kind of phase generated carrier program control based on phase
Demodulating equipment and method.
Background technology
Interference-type optical fiber sensor-based system is by the optical signal phase measure of the change measurand propagated in detection fiber, therefore
Phase demodulating method is most important.Conventional method mainly has active homodyne demodulation method, synthetic heterodyne demodulation method, pre-vector field at present
Demodulation method and phase generated carrier (PGC) demodulation method.
PGC demodulation methods carry out high frequency modulated, so that in interferometer using uneven interferometer by the frequency to optical signal
The middle significantly phase modulated signal for introducing a certain fixed frequency away from measured signal frequency band, makes measured signal turn into modulation and believes
Number sideband, then utilize coherent detection and the measured signal and low of differential multiplication cross (DCM) algorithm separation interferometer output
Out-of-band noise, then the measured signal stablized by integrator and high-pass filter.
PGC demodulation methods are by the advantages of dynamic range is big, sensitivity is high, using widely.In demodulating process, the party
Method needs interference signal being mixed with 1 frequency multiplication carrier signal and 2 frequency multiplication carrier signals respectively, obtain measured signal sine term and
Cosine term.During mixing, it is desirable to which the phase of carrier wave and the phase of frequency-doubled signal are perfectly aligned in interference signal.
But, in systems in practice, interference signal and frequency-doubled signal pass through different light path and circuit, with different phases
Position delay, so as to cause demodulated signal signal to noise ratio severe exacerbation, demodulation accuracy declines.Moreover, there is length in optical device, electronic device
Phase stability problem, can also cause the frequency drift of carrier wave so that the carrier signal of interference signal and the phase difference of frequency-doubled signal
Random change is presented, the difficulty solved the problems, such as is further increased.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of phase generated carrier demodulation device program control based on phase and
Method, the present invention can solve the problem that asynchronous, carrier frequency drift of phase that existing phase generated carrier demodulation technology is present etc. is asked
Topic, improves demodulation accuracy.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of phase generated carrier demodulation device program control based on phase, including controller, two Direct Digital frequencies are closed
Grow up to be a useful person, laser, optical interference circuit, analog-to-digital conversion module and demodulation module, wherein：
The controller connects two Direct Digital Frequency Synthesizers, sets the frequency and initial phase of its output signal,
An outgoing carrier signal in two Direct Digital Frequency Synthesizers, another 1 frequency multiplication carrier signal of output and 2 frequency multiplication carrier waves
Signal；
The carrier signal driving laser produces optical signal to optical interference circuit, and the optical interference circuit makes carrier signal and quilt
Survey signal and realize interference, and export interference signal；
The analog-to-digital conversion module is synchronously completed to interference signal and 1 frequency multiplication on the basis of the sampling clock that controller is given
The analog-to-digital conversion of carrier signal, is exported to controller, two signals are carried out phase alignment by controller；Interference signal after alignment
With 1 frequency multiplication carrier signal and 2 frequency multiplication carrier signals transmit to demodulation module after mixing and LPF respectively and it is carried out
Demodulation, is then output to controller, to realize the demodulation for measured signal.
Further, described two Direct Digital Frequency Synthesizers are connected with shared high stability temperature compensating crystal oscillator, to have
There is high stability synchronised clock.
Further, the carrier signal of described two Direct Digital Frequency Synthesizers outputs, 1 frequency multiplication carrier signal and 2 times
Frequency carrier signal is amplified respectively through an amplifier.
Further, the controller is carried including frequency setting module, phase setup module, sampling clock module, signal
Modulus block and with phase detection module, wherein, the frequency setting module is configured as setting two Direct Digital Frequency Synthesizers
Frequency；The phase setup module is configured as setting the initial phase of two Direct Digital Frequency Synthesizers；The sampling
Clock module produces the sampling clock of analog-to-digital conversion module；The signal extraction module is configured as the numeral letter from demodulation module
Measured signal is extracted in number；The same phase detection module is configured as entering the phase of the data signal from analog-to-digital conversion module
Row detection.
Further, the optical interference circuit makes carrier signal realize interference with measured signal, and exports interference signal to two
Individual frequency mixer and analog-to-digital conversion module, two frequency mixers realize interference signal and 1 frequency multiplication carrier signal, and interference signal respectively
With the mixing of 2 frequency multiplication carrier signals, and mixed signal is exported to different low pass filters respectively.
The low pass filter realizes the LPF of mixed signal, filtered signal is only retained below carrier frequency
Low-frequency component, and export to demodulation module.
The demodulation module includes the differential multiplication cross module being sequentially connected, difference amplifier, integrator, high-pass filtering
Device and analog-to-digital conversion subelement, are configured as the demodulation to signal after two-way LPF, export demodulation after signal to controller.
Method based on said apparatus, controller connects two Direct Digital Frequency Synthesizers, sets its output signal
Frequency and initial phase, make its outgoing carrier signal, 1 frequency multiplication carrier signal and 2 frequency multiplication carrier signals；
Carrier signal driving laser produces optical signal to optical interference circuit, carrier signal is realized with measured signal and interferes,
And export interference signal；
The discretization interference signal that controller is collected to analog-to-digital conversion module carries out bandpass filtering, only retains carrier frequency
Rate composition, the frequency-doubled signal of discretization 1 collected with analog-to-digital conversion module is contrasted, and obtains two-way discretization signal peak institute
Corresponding collection point position, the difference to two groups of collection points position is summed, and when it is less than given threshold, confirms two groups of signal phases
Alignment, otherwise, adjusts the phase value of outgoing carrier signal, until two groups of signal phase alignment；
Interference signal after phase alignment is mixed with 1 frequency-doubled signal, 2 frequency-doubled signals respectively, and carried out after LPF, passes through
After differential multiplication cross module, differential amplification module, integration module and the high-pass filtering resume module of crossing demodulation module, generation is most
Whole demodulated signal, the analog-to-digital conversion subelement of demodulated module completes discretization, and gives controller.
Compared with prior art, beneficial effects of the present invention are：
(1) present invention sets the phase of carrier signal, 1 frequency-doubled signal and 2 frequency-doubled signals, solution using programme controlled mode
Determined interference signal and frequency-doubled signal passes through different light paths problem asynchronous with the phase that circuit is brought, and improves demodulation smart
Degree；
(2) present invention gathers interference signal and 1 frequency-doubled signal in real time, tracks the phase difference of 2 road signals, and according to peak point
Corresponding collection point position adjustment carrier signal and 1 frequency-doubled signal, the phase difference of 2 frequency-doubled signals, eliminate carrier frequency drift
Change, to the adverse effect of demodulation result, further increases demodulation accuracy to caused phase at random.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 is demodulating equipment structure chart.
Fig. 2 is demodulation method flow chart.
Fig. 3 is phase detection principle block diagram.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Term explains part：
DCM：Differential multiplication cross.
As background technology is introduced, exist in the prior art interference signal and frequency-doubled signal by different light paths with
Circuit, with different phase delay, so that cause demodulated signal signal to noise ratio severe exacerbation, the deficiency that demodulation accuracy declines, and
And opto-electronic device has long term stability problem, the frequency drift of carrier wave can be caused so that the carrier signal of interference signal with
Random change is presented in the phase difference of frequency-doubled signal, further increases the difficulty solved the problems, such as.In order to which the technology solved as above is asked
Topic, present applicant proposes a kind of phase generated carrier demodulation device and method program control based on phase.
In a kind of typical embodiment of the application, there is provided a kind of phase life program control based on phase as shown in Figure 1
Into carrier wave demodulation device, by controller, 2 Direct Digital Frequency Synthesizers, high stability temperature compensating crystal oscillator, 3 amplifiers, laser
Device, optical interference circuit, 2 frequency mixers, 2 low pass filters, analog-to-digital conversion module and demodulation module composition.
The controller exports 2 railway digital buses, and 2 Direct Digital Frequency Synthesizers are connected respectively, sets its output letter
Number frequency and initial phase；
The controller exports 1 way wordclock signal, and there is provided during the sampling of analog-to-digital conversion for connection analog-to-digital conversion module
Clock；
The controller inputs 3 railway digital signals, respectively from the 2 railway digital signals and demodulation module of analog-to-digital conversion module
1 railway digital signal；
The controller is by set of frequency, phase setting, sampling clock, signal extraction, same mutually 5 functional module groups of detection
Into；
Set of frequency of the set of frequency Implement of Function Module to 2 Direct Digital Frequency Synthesizers；
The phase sets Implement of Function Module to set the initial phase of 2 Direct Digital Frequency Synthesizers；
The sampling clock functional module produces the sampling clock of analog-to-digital conversion module；
The signal extraction Implement of Function Module extracts the function of measured signal from 1 railway digital signal of demodulation module；
It is described to detect phase-detection of the Implement of Function Module to the 2 railway digital signals from analog-to-digital conversion module with phase；
The frequency and phase of 2 Direct Digital Frequency Synthesizers output signals are controlled by controller, specifically
Say, be by controller is realized by way of number bus sets its frequency control word and phase control words；
2 Direct Digital Frequency Synthesizers export 3 road signals, and the wherein output 1 of Direct Digital Frequency Synthesizers 1 is road-load
Ripple signal, the output frequency multiplication carrier signal of 1 tunnel 1 of Direct Digital Frequency Synthesizers 2 and the frequency multiplication carrier signal of 1 tunnel 2；
The high stability temperature compensating crystal oscillator connects 2 Direct Digital Frequency Synthesizers simultaneously, when providing high stability for it
Clock；
3 amplifiers realize the amplification to 2 tunnel output signals of Direct Digital Frequency Synthesizers 3, wherein amplifier 1
Amplify the carrier signal of Direct Digital Frequency Synthesizers 1, export to laser, the amplification Direct Digital Frequency Synthesizers 2 of amplifier 2
2 frequency multiplication carrier signals, export to frequency mixer 2, amplifier 3 amplifies 1 frequency multiplication carrier signal of Direct Digital Frequency Synthesizers 2,
Export to frequency mixer 1 and analog-to-digital conversion module；
Carrier signal driving of the laser after amplifying, exports optical signal to optical interference circuit；
The optical interference circuit realizes carrier signal and measured signal to interfere, and export interference signal to 2 frequency mixers and
Analog-to-digital conversion module；
2 frequency mixers realize interference signal and 1 frequency multiplication carrier signal, the mixing of 2 frequency multiplication carrier signals respectively, and defeated
Go out to 2 low pass filters；
2 low pass filters realize the LPF of 2 road mixed signals, filtered signal is only retained carrier frequency
Low-frequency component below rate, and export to demodulation module；
The analog-to-digital conversion module is synchronously completed to interference signal and 1 frequency multiplication on the basis of the sampling clock that controller is given
The analog-to-digital conversion of carrier signal, is exported to controller；
The demodulation module is by differential multiplication cross (DCM) module, difference amplifier, integrator, high-pass filter, modulus
Conversion subunit is constituted, and DCM modules, difference amplifier, integrator, high-pass filter, analog-to-digital conversion subelement are sequentially connected, real
Now to the demodulation of signal after 2 road LPFs, export demodulation after signal to controller.
As shown in Figure 2 and Figure 3, method comprises the following steps：
1st step：Initialize carrier signal and frequency-doubled signal
Controller sets the frequency and phase of Direct Digital Frequency Synthesizers 1, and frequency is 16kHz, and phase isCarried
Ripple signal is：
Wherein, A1Represent the amplitude of carrier signal；T represents the time；
Controller sets the frequency and phase of Direct Digital Frequency Synthesizers 2, and obtaining 2 road frequency-doubled signals is respectively：
Wherein, A2Represent the amplitude of 1 frequency-doubled signal；Represent the phase of 1 frequency-doubled signal；A3Represent the width of 2 frequency-doubled signals
Degree；The phase of 2 frequency-doubled signals is represented, and
2nd step：Signal interference and collection
Carrier signal after laser is exaggerated drives, and produces corresponding optical signal and simultaneously enters optical interference circuit, with tested letter
Number interference after, obtain interference signal：
Wherein, I represents interference signal；A4DC terms amplitude is represented, is constant；B represents to exchange item amplitude, is constant；C tables
Show the amplitude of carrier signal in interference signal, be constant；Represent phase dynamic change caused by carrier frequency drift；Integrated phase is represented, and Interference signal phase place change caused by measured signal is represented,The initial phase of optical interference circuit is represented,Represent phase noise；
1 frequency multiplication and 2 frequency-doubled signals are changed into after amplifier：
Wherein, G represents 1 frequency-doubled signal amplitude after amplification；H represents 2 frequency-doubled signal amplitudes after amplification；
3rd step：Phase alignment
Such as Fig. 2, shown in Fig. 3.Phase alignment step is as follows.
3.1st step, analog-to-digital conversion module carries out analog-to-digital conversion to interference signal and 1 frequency-doubled signal and gives controller.
3.2nd step, controller carries out bandpass filtering to interference signal, only retains carrier frequency composition：
Wherein, X1(n) represent that interference signal passes through analog-to-digital conversion discretization, and complete the signal after bandpass filtering；C′
Represent the signal amplitude after bandpass filtering；N represents the points that interference signal is collected within a carrier signal cycle, is normal
Number；N represents sampled point；The discretized values of phase dynamic change caused by carrier frequency drift are represented, due to carrier frequency drift
Shifting is one long-term slow process, in unitary sampling, it is believed that be a constant；
3.3rd step, the 1 frequency multiplication discretization signal that controller is received is：
Wherein, X2(n) discretized values of 1 frequency-doubled signal are represented；
3.4th step, controller obtains the collection point position corresponding to 2 tunnel discretization signal peaks, X1(n) peak value institute is right
The collection point answered is designated as ni,ni+1,ni+2,ni+3,……；X2(n) the collection point corresponding to peak value is nj,nj+1,nj+2,
nj+3,……；
3.5th step, the difference to 2 groups of collection points position is summed：
D=(ni-nj)+(ni+1-nj+1)+(ni+2-nj+2)+……(9)
Ideally, as D=0, the phase of interference signal carrier wave composition is consistent with the phase of 1 frequency-doubled signal, but examines
Consider the factor such as clock jitter, quantization error in analog-digital conversion process, set the threshold value D close to 01, as D≤D1Think interference
The phase of signal carrier composition is consistent with the phase of 1 frequency-doubled signal, completes phase alignment；
If D ＞ D1, controller resets the phase of the outgoing carrier signal of Direct Digital Frequency Synthesizers 1, until D≤
D1, complete phase alignment.
4th step：Signal is demodulated
Interference signal after phase alignment is mixed with 1 frequency-doubled signal, 2 frequency-doubled signals respectively, and carried out after LPF, obtains
Arrive：
Wherein, I1Represent that interference signal and 1 frequency-doubled signal are mixed and carry out the signal after LPF (the 1st road signal)；I2
Represent that interference signal and 2 frequency-doubled signals are mixed and carry out the signal after LPF (the 2nd road signal)；J1And J (C)2(C) it is shellfish
The coefficient of Sai Er function expansions, is constant；
The differential multiplication cross module of demodulated module, signal is changed into：
Wherein, IDCM1Represent signal of the first via signal after differential multiplication cross；IDCM2Represent that second road signal is passed through
Signal after differential multiplication cross；RepresentDifferential.
After differential amplification module, signal is changed into：
Wherein, the result of the signal differential amplification after the road differential multiplication cross of V ' expressions 2；
After integration module, signal is changed into：
Wherein, V represents the result after integration；M is integral constant；
After high-pass filtering module, signal is changed into：
Wherein, S represents the final demodulated signal obtained after high-pass filtering；
The analog-to-digital conversion subelement of the demodulated module of the signal completes discretization, and gives controller.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (10)
1. a kind of phase generated carrier demodulation device program control based on phase, it is characterized in that：Including controller, two Direct Digitals
Frequency synthesizer, laser, optical interference circuit, analog-to-digital conversion module and demodulation module, wherein：
The controller connects two Direct Digital Frequency Synthesizers, sets the frequency and initial phase of its output signal, two
An outgoing carrier signal in Direct Digital Frequency Synthesizers, another 1 frequency multiplication carrier signal of output and 2 frequency multiplication carrier waves letter
Number；
The carrier signal driving laser produces optical signal to optical interference circuit, and the optical interference circuit makes carrier signal and tested letter
Number interference is realized, and export interference signal；
The analog-to-digital conversion module is synchronously completed to interference signal and 1 frequency multiplication carrier wave on the basis of the sampling clock that controller is given
The analog-to-digital conversion of signal, is exported to controller, two signals are carried out phase alignment by controller；Interference signal difference after alignment
With 1 frequency multiplication carrier signal and 2 frequency multiplication carrier signals transmit to demodulation module after mixing and LPF and it be demodulated,
Controller is then output to, to realize the demodulation for measured signal.
2. a kind of phase generated carrier demodulation device program control based on phase as claimed in claim 1, it is characterized in that：Described two
Individual Direct Digital Frequency Synthesizers are connected with shared high stability temperature compensating crystal oscillator, with high stability synchronised clock.
3. a kind of phase generated carrier demodulation device program control based on phase as claimed in claim 1, it is characterized in that：Described two
Carrier signal, 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signals of individual Direct Digital Frequency Synthesizers output are put respectively through one
Big device amplification.
4. a kind of phase generated carrier demodulation device program control based on phase as claimed in claim 1, it is characterized in that：The control
Device processed includes frequency setting module, phase setup module, sampling clock module, signal extraction module and with phase detection module, its
In, the frequency setting module is configured as setting the frequency of two Direct Digital Frequency Synthesizers；The phase setup module
It is configured as setting the initial phase of two Direct Digital Frequency Synthesizers；The sampling clock module produces analog-to-digital conversion module
Sampling clock；The signal extraction module is configured as from the data signal of demodulation module extracting measured signal；It is described same
Phase detection module is configured as detecting the phase of the data signal from analog-to-digital conversion module.
5. a kind of phase generated carrier demodulation device program control based on phase as claimed in claim 1, it is characterized in that：It is described dry
Relating to light path makes carrier signal realize interference with measured signal, and exports interference signal to two frequency mixers and analog-to-digital conversion module,
Two frequency mixers realize interference signal and 1 frequency multiplication carrier signal respectively, and interference signal and 2 frequency multiplication carrier signals mixing,
And export mixed signal to different low pass filters respectively.
6. a kind of phase generated carrier demodulation device program control based on phase as claimed in claim 1, it is characterized in that：It is described low
Bandpass filter realizes the LPF of mixed signal, filtered signal is only retained the low-frequency component below carrier frequency, and
Export to demodulation module.
7. a kind of phase generated carrier demodulation device program control based on phase as claimed in claim 1, it is characterized in that：The solution
Mode transfer block includes differential multiplication cross module, difference amplifier, integrator, high-pass filter and analog-to-digital conversion being sequentially connected
Unit, is configured as the demodulation to signal after two-way LPF, export demodulation after signal to controller.
8. based on the method for the device as any one of claim 1-7, it is characterized in that：Controller connects two directly numbers
Word frequency synthesizer, sets the frequency and initial phase of its output signal, makes its outgoing carrier signal, 1 frequency multiplication carrier signal and 2
Frequency multiplication carrier signal；
Carrier signal driving laser produces optical signal to optical interference circuit, carrier signal is realized with measured signal and interferes, and defeated
Go out interference signal；
Discretization interference signal that controller is collected to analog-to-digital conversion module carries out bandpass filtering, only retain carrier frequency into
Part, the frequency-doubled signal of discretization 1 collected with analog-to-digital conversion module is contrasted, obtained corresponding to two-way discretization signal peak
Collection point position, to two groups of collection points position difference sum, when its be less than given threshold when, confirm two groups of signal phases pair
Together, otherwise, the phase value of outgoing carrier signal is adjusted, until two groups of signal phase alignment；
Interference signal after alignment after 1 frequency-doubled signal, the mixing of 2 frequency-doubled signals and LPF respectively with transmitting to demodulation module pair
It is demodulated, and is then output to controller.
9. method as claimed in claim 8, it is characterized in that：The discretization interference signal that analog-to-digital conversion module is collected is carried out
After high-order bandpass filtering, controller records its peak, then the frequency-doubled signal of discretization 1 collected with analog-to-digital conversion module
Peak difference summation, carry out with mutually judge.
10. method as claimed in claim 8, it is characterized in that：Interference signal after phase alignment respectively with 1 frequency-doubled signal, 2 times
Frequency signal is mixed, and is carried out after LPF, the differential multiplication cross module of demodulated module, differential amplification module, integration
After module and high-pass filtering resume module, generate final demodulated signal, the analog-to-digital conversion subelement of demodulated module complete from
Dispersion, and give controller.
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| CN108449742A (en) * | 2018-03-13 | 2018-08-24 | 北京邮电大学 | A kind of aid demodulation system and method for near-field communication |
| CN109361636A (en) * | 2018-12-05 | 2019-02-19 | 珠海任驰光电科技有限公司 | A kind of demodulating equipment and method based on phase generated carrier |
| CN110646020A (en) * | 2019-10-30 | 2020-01-03 | 电子科技大学中山学院 | Optical fiber interference device and method |
| CN111355485A (en) * | 2019-09-29 | 2020-06-30 | 西安空间无线电技术研究所 | System and method for eliminating phase drift of delay line |
| CN114826426A (en) * | 2022-06-24 | 2022-07-29 | 国科大杭州高等研究院 | Parameter-adaptive high-precision digital laser phase locking system and method |
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| CN114826426A (en) * | 2022-06-24 | 2022-07-29 | 国科大杭州高等研究院 | Parameter-adaptive high-precision digital laser phase locking system and method |
| CN114826426B (en) * | 2022-06-24 | 2022-10-18 | 国科大杭州高等研究院 | Parameter-adaptive high-precision digital laser phase locking system and method |
| CN115412089A (en) * | 2022-09-22 | 2022-11-29 | 中国科学院长春光学精密机械与物理研究所 | Automatic phase alignment method for demodulation switching signal |
| CN115412089B (en) * | 2022-09-22 | 2024-04-09 | 中国科学院长春光学精密机械与物理研究所 | Automatic phase alignment method for demodulation switch signal |
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