CN106992818B - Phase program control-based phase generation carrier demodulation device and method - Google Patents
Phase program control-based phase generation carrier demodulation device and method Download PDFInfo
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Abstract
The invention discloses a phase generation carrier demodulation device and a method based on phase program control, which synchronously complete analog-to-digital conversion of interference signals and 1-frequency multiplication carrier signals by taking a sampling clock as a reference, and align phases of the two signals; the aligned interference signals are respectively mixed with the 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signal, and then transmitted to a demodulation module for demodulation after low-pass filtering so as to realize demodulation of the detected signals. The invention collects interference signals and 1 frequency multiplication signals in real time, tracks the phase difference of 2 paths of signals, adjusts the phase difference of carrier signals, 1 frequency multiplication signals and 2 frequency multiplication signals according to the collection point position corresponding to the peak point, solves the problem of phase dyssynchrony caused by the interference signals and the frequency multiplication signals passing through different light paths and circuits, eliminates the adverse effect of random phase change caused by carrier frequency drift on demodulation results, and improves demodulation accuracy.
Description
Technical Field
The invention belongs to the field of phase generation carrier demodulation, and particularly relates to a phase generation carrier demodulation device and method based on phase program control.
Background
The interference type optical fiber sensing system measures the measured object by detecting the phase change of the optical signal propagated in the optical fiber, so that the phase demodulation method is important. The methods commonly used at present mainly comprise an active homodyne demodulation method, a synthetic heterodyne demodulation method, a pseudo heterodyne demodulation method and a Phase Generation Carrier (PGC) demodulation method.
The PGC demodulation method adopts an unbalanced interferometer, and carries out high-frequency modulation on the frequency of an optical signal, so that a large-amplitude phase modulation signal with a certain fixed frequency far from the frequency band of a detected signal is introduced into the interferometer, the detected signal becomes a sideband of the modulation signal, then the detected signal output by the interferometer and noise outside a low frequency band are separated by utilizing a correlation detection and Differential Cross Multiplication (DCM) algorithm, and then a stable detected signal is obtained by an integrator and a high-pass filter.
The PGC demodulation method has wide application by virtue of the advantages of large dynamic range, high sensitivity and the like. In the demodulation process, the method needs to mix the interference signal with the 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signal respectively to obtain sine terms and cosine terms of the detected signal. During mixing, the phase of the carrier wave in the interference signal and the phase of the frequency-doubled signal are required to be perfectly aligned.
However, in a practical system, the interference signal and the frequency-doubled signal have different phase delays through different optical paths and circuits, so that the signal-to-noise ratio of the demodulation signal is seriously deteriorated, and the demodulation accuracy is lowered. In addition, the optical device and the electronic device have the problem of long-term stability, and the frequency drift of a carrier wave can be caused, so that the phase difference between a carrier wave signal and a frequency multiplication signal of an interference signal is randomly changed, and the difficulty of solving the problem is further increased.
Disclosure of Invention
The invention provides a phase generation carrier demodulation device and a method based on phase program control, which can solve the problems of phase asynchronism, carrier frequency drift and the like in the existing phase generation carrier demodulation technology and improve demodulation precision.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the phase generation carrier demodulation device based on phase program control comprises a controller, two direct digital frequency synthesizers, a laser, an interference light path, an analog-to-digital conversion module and a demodulation module, wherein:
the controller is connected with two direct digital frequency synthesizers, the frequency and the initial phase of the output signals of the two direct digital frequency synthesizers are set, one of the two direct digital frequency synthesizers outputs a carrier signal, and the other one of the two direct digital frequency synthesizers outputs a 1 frequency multiplication carrier signal and a 2 frequency multiplication carrier signal;
the carrier signal drives the laser to generate an optical signal to an interference light path, and the interference light path enables the carrier signal to interfere with a signal to be detected and outputs an interference signal;
the analog-to-digital conversion module synchronously completes analog-to-digital conversion of the interference signal and the 1-frequency multiplication carrier signal by taking a sampling clock given by the controller as a reference, and outputs the signals to the controller, and the controller performs phase alignment on the two signals; the aligned interference signals are respectively mixed with the 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signal, and then transmitted to a demodulation module for demodulation, and then output to a controller for demodulation of the detected signals.
Furthermore, the two direct digital frequency synthesizers are connected with a common high-stability temperature compensation crystal oscillator so as to have a high-stability synchronous clock.
Further, the carrier signals output by the two direct digital frequency synthesizers, the 1-frequency-doubling carrier signal and the 2-frequency-doubling carrier signal are amplified by one amplifier respectively.
Further, the controller comprises a frequency setting module, a phase setting module, a sampling clock module, a signal extraction module and an in-phase detection module, wherein the frequency setting module is configured to set the frequencies of two direct digital frequency synthesizers; the phase setting module is configured to set initial phases of two direct digital frequency synthesizers; the sampling clock module generates a sampling clock of the analog-to-digital conversion module; the signal extraction module is configured to extract a detected signal from the digital signal of the demodulation module; the in-phase detection module is configured to detect a phase of the digital signal from the analog-to-digital conversion module.
Furthermore, the interference light path enables the carrier signal to interfere with the detected signal, and outputs the interference signal to the two mixers and the analog-to-digital conversion module, the two mixers respectively realize the mixing of the interference signal and the 1 frequency multiplication carrier signal, and the interference signal and the 2 frequency multiplication carrier signal, and the mixed signals are respectively output to different low-pass filters.
The low-pass filter realizes low-pass filtering of the mixed signals, so that the filtered signals only retain low-frequency components below the carrier frequency and are output to the demodulation module.
The demodulation module comprises a differential cross multiplication module, a differential amplifier, an integrator, a high-pass filter and an analog-to-digital conversion subunit which are sequentially connected, and is configured to demodulate two paths of low-pass filtered signals and output the demodulated signals to the controller.
Based on the method of the device, the controller is connected with two direct digital frequency synthesizers, and the frequency and the initial phase of the output signals are set to enable the output signals to output carrier signals, 1 frequency multiplication carrier signals and 2 frequency multiplication carrier signals;
the carrier signal drives the laser to generate an optical signal to the interference light path, so that the carrier signal and the measured signal are interfered, and an interference signal is output;
the controller carries out band-pass filtering on the discretization interference signals acquired by the analog-to-digital conversion module, only retains carrier frequency components, compares the discretization interference signals with the discretization 1 frequency multiplication signals acquired by the analog-to-digital conversion module to obtain acquisition point positions corresponding to two paths of discretization signal peaks, sums the differences of the positions of the two groups of acquisition points, confirms that the phases of the two groups of signals are aligned when the differences are smaller than a set threshold, and otherwise, adjusts the phase value of the output carrier signals until the phases of the two groups of signals are aligned;
the interference signals after phase alignment are mixed with the 1 frequency multiplication signal and the 2 frequency multiplication signal respectively, are subjected to low-pass filtering, are processed by a differential cross multiplication module, a differential amplification module, an integration module and a high-pass filtering module of a demodulation module, generate final demodulation signals, are subjected to discretization by an analog-digital conversion subunit of the demodulation module, and are sent to a controller.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention adopts a program control mode to set the phases of the carrier signal, the 1 frequency multiplication signal and the 2 frequency multiplication signal, solves the problem of phase dyssynchrony caused by the interference signal and the frequency multiplication signal passing through different light paths and circuits, and improves demodulation precision;
(2) The invention collects interference signals and 1 frequency multiplication signals in real time, tracks the phase difference of 2 paths of signals, adjusts the phase difference of carrier signals, 1 frequency multiplication signals and 2 frequency multiplication signals according to the collection point position corresponding to the peak point, eliminates the adverse effect of random phase change caused by carrier frequency drift on demodulation results, and further improves demodulation accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
Fig. 1 is a block diagram of a demodulation apparatus.
Fig. 2 is a flow chart of a demodulation method.
Fig. 3 is a schematic block diagram of phase detection.
The specific embodiment is as follows:
the invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Term interpretation section:
DCM: differential cross-multiplication.
As introduced by the background technology, in the prior art, interference signals and frequency multiplication signals have different phase delays through different light paths and circuits, so that the signal-to-noise ratio of demodulation signals is seriously deteriorated, the demodulation precision is reduced, and the photoelectronic device has the problem of long-term stability and can cause the frequency drift of carriers, so that the phase difference between the carrier signals of the interference signals and the frequency multiplication signals is randomly changed, and the difficulty of solving the problem is further increased. In order to solve the technical problems, the application provides a phase generation carrier demodulation device and method based on phase program control.
In an exemplary embodiment of the present application, as shown in fig. 1, a phase generating carrier demodulation device based on phase program control is provided, which is composed of a controller, 2 direct digital frequency synthesizers, high-stability temperature compensation crystal oscillators, 3 amplifiers, lasers, an interference optical path, 2 mixers, 2 low-pass filters, an analog-to-digital conversion module and a demodulation module.
The controller outputs 2 paths of digital buses which are respectively connected with 2 direct digital frequency synthesizers, and the frequency and initial phase of output signals of the controller are set;
the controller outputs 1-path digital clock signals, is connected with the analog-to-digital conversion module and provides sampling clocks for analog-to-digital conversion;
the controller inputs 3 paths of digital signals, namely 2 paths of digital signals from the analog-to-digital conversion module and 1 path of digital signals from the demodulation module;
the controller consists of 5 functional modules of frequency setting, phase setting, sampling clock, signal extraction and in-phase detection;
the frequency setting function module is used for setting the frequencies of 2 direct digital frequency synthesizers;
the phase setting function module realizes initial phase setting of 2 direct digital frequency synthesizers;
the sampling clock function module generates a sampling clock of the analog-to-digital conversion module;
the signal extraction function module is used for extracting a detected signal from the 1-path digital signal of the demodulation module;
the in-phase detection functional module is used for detecting the phase of 2 paths of digital signals from the analog-to-digital conversion module;
the frequency and the phase of the output signals of the 2 direct digital frequency synthesizers are controlled by a controller, and specifically, the frequency control word and the phase control word of the output signals are set by the controller through a digital bus;
the 2 direct digital frequency synthesizers output 3 paths of signals, wherein the direct digital frequency synthesizer 1 outputs 1 path of carrier signals, and the direct digital frequency synthesizer 2 outputs 1 path of 1 frequency multiplication carrier signals and 1 path of 2 frequency multiplication carrier signals;
the high-stability temperature compensation crystal oscillator is simultaneously connected with 2 direct digital frequency synthesizers, and provides a high-stability clock for the high-stability temperature compensation crystal oscillator;
the 3 amplifiers amplify 3 paths of output signals of the 2 direct digital frequency synthesizers, wherein the amplifier 1 amplifies a carrier signal of the direct digital frequency synthesizers 1 and outputs the carrier signal to the laser, the amplifier 2 amplifies a frequency multiplication carrier signal of the direct digital frequency synthesizers 2 and outputs the frequency multiplication carrier signal to the mixer 2, and the amplifier 3 amplifies a frequency multiplication carrier signal of the direct digital frequency synthesizers 2 and outputs the frequency multiplication carrier signal to the mixer 1 and the analog-to-digital conversion module;
the laser is driven by the amplified carrier signal and outputs an optical signal to the interference optical path;
the interference light path enables the carrier signal to interfere with the detected signal, and outputs interference signals to the 2 mixers and the analog-to-digital conversion module;
the 2 mixers respectively realize the mixing of the interference signal, the 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signal and output the interference signal, the 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signal to the 2 low-pass filters;
the 2 low-pass filters realize low-pass filtering of 2 paths of mixed signals, so that the filtered signals only retain low-frequency components below carrier frequency and are output to the demodulation module;
the analog-to-digital conversion module synchronously completes analog-to-digital conversion of the interference signal and the 1-frequency multiplication carrier signal by taking a sampling clock given by the controller as a reference, and outputs the analog-to-digital conversion signal and the 1-frequency multiplication carrier signal to the controller;
the demodulation module consists of a Differential Cross Multiplication (DCM) module, a differential amplifier, an integrator, a high-pass filter and an analog-to-digital conversion subunit, wherein the DCM module, the differential amplifier, the integrator, the high-pass filter and the analog-to-digital conversion subunit are sequentially connected to demodulate 2 paths of signals after low-pass filtering and output the demodulated signals to the controller.
As shown in fig. 2 and 3, the method comprises the following steps:
step 1: initializing carrier signals and frequency-doubled signals
The controller sets the frequency and phase of the direct digital frequency synthesizer 1 to 16kHz and the phase is
The carrier signal is obtained as follows:
wherein A is 1 Representing the amplitude of the carrier signal; t represents time;
the controller sets the frequency and the phase of the direct digital frequency synthesizer 2, and the obtained 2 paths of frequency multiplication signals are respectively:
wherein A is 2 Representing the amplitude of the 1-frequency multiplied signal;
representing the phase of the 1-octave signal; a is that 3 Representing the amplitude of the 2-fold signal; />
Represents the phase of the 2-fold signal and +.>
Step 2: signal interference and acquisition
The laser is driven by the amplified carrier signal, generates a corresponding optical signal and enters an interference light path, and after the interference light path interferes with a measured signal, an interference signal is obtained:
wherein I represents an interference signal; a is that 4 The amplitude of the direct current term is represented as a constant; b represents the amplitude of an alternating current term and is constant; c represents the amplitude of a carrier signal in the interference signal and is a constant;
representing the dynamic phase change caused by carrier frequency drift;
represents the integrated phase, and->
Indicating the phase change of the interference signal caused by the measured signal, < >>
Representing the initial phase of the interference light path, +.>
Representing phase noise;
after the 1 and 2 frequency multiplied signals pass through the amplifier, the signals become:
wherein G represents the amplified 1-frequency multiplication signal amplitude; h represents the amplified 2-frequency multiplication signal amplitude;
step 3: phase alignment
As shown in fig. 2 and 3. The phase alignment steps are as follows.
And 3.1, performing analog-to-digital conversion on the interference signal and the 1-frequency multiplication signal by an analog-to-digital conversion module and transmitting the interference signal and the 1-frequency multiplication signal to a controller.
Step 3.2, the controller carries out band-pass filtering on the interference signal, and only retains the carrier frequency components:
wherein X is 1 (n) represents that the interference signal is discretized by analog-to-digital conversion and band-pass filtering is completedA signal; c' represents the signal amplitude after band-pass filtering; n represents the number of points of the interference signal acquired in one carrier signal period and is constant; n represents a sampling point;
a discretized value representing the dynamic change of phase caused by carrier frequency drift, which is a slow process for a long period of time, can be considered as a constant in a single sample;
step 3.3, the 1 frequency multiplication discretization signal received by the controller is:
wherein X is 2 (n) represents a discretization value of the 1-frequency multiplied signal;
step 3.4, the controller obtains the acquisition point position corresponding to the 2 paths of discretization signal peak value, X 1 The acquisition point corresponding to the peak value of (n) is denoted as n i ,n i+1 ,n i+2 ,n i+3 ,……；X 2 The collection point corresponding to the peak value of (n) is n j ,n j+1 ,n j+2 ,n j+3 ,……；
Step 3.5, summing the differences of the positions of the 2 groups of acquisition points:
D＝(n i -n j )+(n i+1 -n j+1 )+(n i+2 -n j+2 )+……(9)
ideally, when d=0, the phase of the carrier component of the interference signal coincides with the phase of the 1-fold signal, but a threshold D close to 0 is set in consideration of factors such as clock jitter and quantization error during analog-to-digital conversion 1 When D is less than or equal to D 1 Namely, the phase of the carrier component of the interference signal is considered to be consistent with the phase of the 1 frequency multiplication signal, and the phase alignment is completed;
if D > D 1 The controller resets the phase of the output carrier signal of the direct digital frequency synthesizer 1 until D is less than or equal to D 1 Phase alignment is completed.
Step 4: signal demodulation
The interference signals after phase alignment are mixed with 1 frequency multiplication signals and 2 frequency multiplication signals respectively, and low-pass filtering is carried out to obtain the interference signals:
wherein I is 1 Representing the signal after mixing the interference signal with the 1 st frequency multiplication signal and performing low-pass filtering (1 st path signal); i 2 Representing the signal after mixing the interference signal with the 2 nd frequency multiplied signal and performing low-pass filtering (the 2 nd signal); j (J) 1 (C) And J 2 (C) The coefficient of the expansion of the Bessel function is constant;
the signal becomes, through the differential cross multiplication module of the demodulation module:
wherein I is DCM1 Representing the first path of signals after differential cross multiplication; i DCM2 Representing the signal obtained by differential cross multiplication of the second path of signal;
representation->
Is a derivative of (a).
After passing through the differential amplification module, the signal becomes:
wherein V' represents the result of differential amplification of the signals after 2 paths of differential cross multiplication;
after passing through the integration module, the signal becomes:
wherein V represents the result after integration; m is an integration constant;
after passing through the high pass filter module, the signal becomes:
s represents a final demodulation signal obtained after high-pass filtering;
the signal is discretized by an analog-digital conversion subunit of the demodulation module and sent to the controller.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. A phase generation carrier demodulation device based on phase program control is characterized in that: the device comprises a controller, two direct digital frequency synthesizers, a laser, an interference light path, an analog-to-digital conversion module and a demodulation module, wherein:
the controller is connected with two direct digital frequency synthesizers, the frequency and the initial phase of the output signals of the two direct digital frequency synthesizers are set, one of the two direct digital frequency synthesizers outputs a carrier signal, and the other one of the two direct digital frequency synthesizers outputs a 1 frequency multiplication carrier signal and a 2 frequency multiplication carrier signal;
the carrier signal drives the laser to generate an optical signal to an interference light path, and the interference light path enables the carrier signal to interfere with a signal to be detected and outputs an interference signal;
the analog-to-digital conversion module synchronously completes analog-to-digital conversion of the interference signal and the 1-frequency multiplication carrier signal by taking a sampling clock given by the controller as a reference, and outputs the signals to the controller, and the controller performs phase alignment on the two signals; the aligned interference signals are respectively mixed with the 1 frequency multiplication carrier signal and the 2 frequency multiplication carrier signal, and then transmitted to a demodulation module for demodulation, and then output to a controller for demodulation of the detected signals;
the two direct digital frequency synthesizers are connected with a common high-stability temperature compensation crystal oscillator so as to have a high-stability synchronous clock;
the carrier signals output by the two direct digital frequency synthesizers, the 1-times frequency multiplication carrier signal and the 2-times carrier signal are amplified by one amplifier respectively.
2. The phase-programming-based phase-generating carrier demodulation apparatus as claimed in claim 1, wherein: the controller comprises a frequency setting module, a phase setting module, a sampling clock module, a signal extraction module and an in-phase detection module, wherein the frequency setting module is configured to set the frequencies of two direct digital frequency synthesizers; the phase setting module is configured to set initial phases of two direct digital frequency synthesizers; the sampling clock module generates a sampling clock of the analog-to-digital conversion module; the signal extraction module is configured to extract a detected signal from the digital signal of the demodulation module; the in-phase detection module is configured to detect a phase of the digital signal from the analog-to-digital conversion module.
3. The phase-programming-based phase-generating carrier demodulation apparatus as claimed in claim 1, wherein: the interference light path enables the carrier signal to interfere with the detected signal, and outputs the interference signal to the two mixers and the analog-to-digital conversion module, the two mixers respectively realize the mixing of the interference signal and the 1 frequency multiplication carrier signal, and the interference signal and the 2 frequency multiplication carrier signal, and the mixed signals are respectively output to different low-pass filters.
4. The phase-programming-based phase-generating carrier demodulation apparatus as claimed in claim 1, wherein: the low-pass filter realizes low-pass filtering of the mixed signals, so that the filtered signals only retain low-frequency components below the carrier frequency and are output to the demodulation module.
5. The phase-programming-based phase-generating carrier demodulation apparatus as claimed in claim 1, wherein: the demodulation module comprises a differential cross multiplication module, a differential amplifier, an integrator, a high-pass filter and an analog-to-digital conversion subunit which are sequentially connected, and is configured to demodulate two paths of low-pass filtered signals and output the demodulated signals to the controller.
6. A phase generating carrier demodulation method based on an apparatus according to any one of claims 1-5, characterized by: the controller is connected with the two direct digital frequency synthesizers, and sets the frequency and initial phase of the output signals of the direct digital frequency synthesizers to enable the output signals of the direct digital frequency synthesizers to output carrier signals, 1 frequency multiplication carrier signals and 2 frequency multiplication carrier signals;
the carrier signal drives the laser to generate an optical signal to the interference light path, so that the carrier signal and the measured signal are interfered, and an interference signal is output;
the controller carries out band-pass filtering on the discretization interference signals acquired by the analog-to-digital conversion module, only retains carrier frequency components, compares the discretization interference signals with the discretization 1 frequency multiplication signals acquired by the analog-to-digital conversion module to obtain acquisition point positions corresponding to two paths of discretization signal peaks, sums the differences of the positions of the two groups of acquisition points, confirms that the phases of the two groups of signals are aligned when the differences are smaller than a set threshold, and otherwise, adjusts the phase value of the output carrier signals until the phases of the two groups of signals are aligned;
the aligned interference signals are mixed with the 1 frequency multiplication signals and the 2 frequency multiplication signals respectively, and then transmitted to a demodulation module for demodulation, and then output to a controller.
7. The phase-generating carrier demodulation method as claimed in claim 6, wherein: after the discretization interference signals acquired by the analog-to-digital conversion module are subjected to high-order band-pass filtering, the controller records the peak value position of the discretization interference signals, and then sums the peak value position difference of the discretization 1 frequency multiplication signals acquired by the analog-to-digital conversion module, so as to carry out in-phase judgment.
8. The phase-generating carrier demodulation method as claimed in claim 6, wherein: the interference signals after phase alignment are mixed with the 1 frequency multiplication signal and the 2 frequency multiplication signal respectively, are subjected to low-pass filtering, are processed by a differential cross multiplication module, a differential amplification module, an integration module and a high-pass filtering module of a demodulation module, generate final demodulation signals, are subjected to discretization by an analog-digital conversion subunit of the demodulation module, and are sent to a controller.
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| CN108449742B (en) * | 2018-03-13 | 2020-05-19 | 北京邮电大学 | Auxiliary 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 |
| CN111355485B (en) * | 2019-09-29 | 2023-03-28 | 西安空间无线电技术研究所 | System and method for eliminating phase drift of delay line |
| CN110646020B (en) * | 2019-10-30 | 2023-01-24 | 电子科技大学中山学院 | Optical fiber interference device and method |
| CN115085818B (en) * | 2022-06-10 | 2024-02-09 | 中国科学院精密测量科学与技术创新研究院 | Zero harmonic broadband adjustable output radio frequency signal source for laser modulation |
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| 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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