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
本发明公开了一种基于相位程控的相位生成载波解调装置及方法，以采样时钟为基准，同步完成对干涉信号和1倍频载波信号的模数转换，将两个信号进行相位对齐；对齐后的干涉信号分别与1倍频载波信号和2倍频载波信号进行混频和低通滤波后传输至解调模块对其进行解调，以实现对于被测信号的解调。本发明实时采集干涉信号和1倍频信号，跟踪2路信号的相位差，并依据峰值点对应的采集点位置调整载波信号与1倍频信号、2倍频信号的相位差，不但解决了干涉信号和倍频信号经过不同的光路与电路带来的相位不同步问题，而且消除了载波频率漂移引起的相位随机变化对解调结果的不利影响，提高了解调精度。
The invention discloses a phase generation carrier demodulation device and method based on phase program control. Taking the sampling clock as a reference, the analog-to-digital conversion of the interference signal and the 1-fold frequency carrier signal is completed synchronously, and the phases of the two signals are aligned; The final interference signal is mixed and low-pass filtered with the 1-fold frequency carrier signal and the 2-fold frequency carrier signal respectively, and then transmitted to the demodulation module for demodulation, so as to realize the demodulation of the measured signal. The present invention collects the interference signal and the double frequency signal in real time, tracks the phase difference of the two signals, and adjusts the phase difference between the carrier signal and the double frequency signal and the double frequency signal according to the position of the acquisition point corresponding to the peak point, which not only solves the problem of interference The phase asynchronous problem caused by the signal and the frequency multiplied signal passing through different optical paths and circuits, and the adverse effect of random phase changes caused by carrier frequency drift on the demodulation results are eliminated, and the demodulation accuracy is improved.
Description
技术领域technical field
本发明属于相位生成载波解调领域，尤其涉及一种基于相位程控的相位生成载波解调装置及方法。The invention belongs to the field of phase generation carrier demodulation, in particular to a phase program control based phase generation carrier demodulation device and method.
背景技术Background technique
干涉型光纤传感系统通过检测光纤中传播的光信号相位变化测量被测对象，因此相位解调方法至关重要。目前常用的方法主要有主动零差解调法、合成外差解调法、伪外差解调法和相位生成载波(PGC)解调法。The interferometric optical fiber sensing system measures the measured object by detecting the phase change of the optical signal propagating in the optical fiber, so the phase demodulation method is very important. At present, the commonly used methods mainly include active homodyne demodulation, synthetic heterodyne demodulation, pseudo heterodyne demodulation and phase generated carrier (PGC) demodulation.
PGC解调法采用不平衡干涉仪，通过对光信号的频率进行高频调制，从而在干涉仪中引入远离被测信号频带的某一固定频率的大幅度相位调制信号，使被测信号成为调制信号的边带，然后利用相关检测和微分交叉相乘(DCM)算法分离干涉仪输出的被测信号和低频带外噪声，再通过积分器和高通滤波器得到稳定的被测信号。The PGC demodulation method uses an unbalanced interferometer, and through high-frequency modulation of the frequency of the optical signal, a large-amplitude phase modulation signal of a fixed frequency far away from the frequency band of the measured signal is introduced into the interferometer, so that the measured signal becomes a modulated signal. The sideband of the signal, and then use the correlation detection and differential cross multiplication (DCM) algorithm to separate the measured signal output by the interferometer and the low-frequency out-of-band noise, and then obtain a stable measured signal through an integrator and a high-pass filter.
PGC解调法凭借动态范围大、灵敏度高等优点，应用非常广泛。在解调过程中，该方法需要将干涉信号分别与1倍频载波信号和2倍频载波信号混频，获取被测信号的正弦项和余弦项。混频时，要求干涉信号中载波的相位和倍频信号的相位完全对齐。The PGC demodulation method is widely used due to its advantages of large dynamic range and high sensitivity. In the demodulation process, the method needs to mix the interference signal with the 1-fold frequency carrier signal and the 2-fold frequency carrier signal respectively to obtain the sine term and cosine term of the measured signal. When mixing, it is required that the phase of the carrier in the interference signal and the phase of the multiplied signal be completely aligned.
但是，在实际系统中，干涉信号和倍频信号经过不同的光路与电路，具有不同的相位延迟，从而导致解调信号信噪比严重恶化，解调精度下降。而且，光器件、电子器件存在长期稳定性问题，还会造成载波的频率漂移，使得干涉信号的载波信号与倍频信号的相位差呈现随机变化，进一步加大了解决问题的难度。However, in an actual system, the interference signal and the frequency-multiplied signal pass through different optical paths and circuits, and have different phase delays, which lead to a serious deterioration of the signal-to-noise ratio of the demodulated signal and a decrease in demodulation accuracy. Moreover, there are long-term stability problems in optical devices and electronic devices, which will also cause frequency drift of the carrier, making the phase difference between the carrier signal of the interference signal and the frequency multiplier signal to show random changes, which further increases the difficulty of solving the problem.
发明内容Contents of the invention
本发明为了解决上述问题，提出了一种基于相位程控的相位生成载波解调装置及方法，本发明能够解决现有相位生成载波解调技术存在的相位不同步、载波频率漂移等问题，提高解调精度。In order to solve the above-mentioned problems, the present invention proposes a phase generation carrier demodulation device and method based on phase program control. Adjust the accuracy.
为了实现上述目的，本发明采用如下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种基于相位程控的相位生成载波解调装置，包括控制器、两个直接数字频率合成器、激光器、干涉光路、模数转换模块和解调模块，其中：A phase generation carrier demodulation device based on phase program control, including a controller, two direct digital frequency synthesizers, a laser, an interference optical path, an analog-to-digital conversion module and a demodulation module, wherein:
所述控制器连接两个直接数字频率合成器，设置其输出信号的频率和初始相位，两个直接数字频率合成器中的一个输出载波信号，另一个输出1倍频载波信号和2倍频载波信号；The controller is connected with two direct digital frequency synthesizers to set the frequency and initial phase of its output signal, one of the two direct digital frequency synthesizers outputs a carrier signal, and the other outputs a 1-fold frequency carrier signal and a 2-fold frequency carrier signal Signal;
所述载波信号驱动激光器产生光信号给干涉光路，所述干涉光路使载波信号与被测信号实现干涉，并输出干涉信号；The carrier signal drives the laser to generate an optical signal to the interference optical path, and the interference optical path causes the carrier signal to interfere with the measured signal, and outputs an interference signal;
所述模数转换模块以控制器给的采样时钟为基准，同步完成对干涉信号和1倍频载波信号的模数转换，输出给控制器，控制器将两个信号进行相位对齐；对齐后的干涉信号分别与1倍频载波信号和2倍频载波信号进行混频和低通滤波后传输至解调模块对其进行解调，然后输出给控制器，以实现对于被测信号的解调。The analog-to-digital conversion module is based on the sampling clock given by the controller, synchronously completes the analog-to-digital conversion of the interference signal and the 1-fold frequency carrier signal, and outputs it to the controller, and the controller phase-aligns the two signals; The interference signal is mixed and low-pass filtered with the 1-fold frequency carrier signal and the 2-fold frequency carrier signal respectively, and then transmitted to the demodulation module for demodulation, and then output to the controller to realize the demodulation of the measured signal.
进一步的，所述两个直接数字频率合成器连接有共用的高稳定性温补晶振，以具有高稳定性同步时钟。Further, the two direct digital frequency synthesizers are connected to a common high-stability temperature-compensated crystal oscillator, so as to have a high-stability synchronous clock.
进一步的，所述两个直接数字频率合成器输出的载波信号、1倍频载波信号和2倍频载波信号分别经过一个放大器放大。Further, the carrier signal, 1-fold frequency carrier signal and 2-fold frequency carrier signal output by the two direct digital frequency synthesizers are respectively amplified by an amplifier.
进一步的，所述控制器包括频率设置模块、相位设置模块、采样时钟模块、信号提取模块和同相检测模块，其中，所述频率设置模块被配置为设置两个直接数字频率合成器的频率；所述相位设置模块被配置为设置两个直接数字频率合成器的初始相位；所述采样时钟模块产生模数转换模块的采样时钟；所述信号提取模块被配置为从解调模块的数字信号中提取被测信号；所述同相检测模块被配置为对来自模数转换模块的数字信号的相位进行检测。Further, the controller includes 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 frequency of two direct digital frequency synthesizers; The phase setting module is configured to set the initial phase of two direct digital frequency synthesizers; the sampling clock module generates the sampling clock of the analog-to-digital conversion module; the signal extraction module is configured to extract from the digital signal of the demodulation module The signal under test; the in-phase detection module is configured to detect the phase of the digital signal from the analog-to-digital conversion module.
进一步的，所述干涉光路使载波信号与被测信号实现干涉，并输出干涉信号给两个混频器和模数转换模块，两个混频器分别实现干涉信号和1倍频载波信号，以及干涉信号和2倍频载波信号的混频，并将混频后信号分别输出给不同的低通滤波器。Further, the interference optical path enables the carrier signal to interfere with the measured signal, and outputs the interference signal to two mixers and an analog-to-digital conversion module, and the two mixers respectively implement the interference signal and the 1-fold carrier signal, and The interference signal is mixed with the 2-fold frequency carrier signal, and the mixed signals are output to different low-pass filters.
所述低通滤波器实现混频后信号的低通滤波，使滤波后信号只保留载波频率以下的低频成分，并输出给解调模块。The low-pass filter implements low-pass filtering of the mixed signal, so that the filtered signal only retains low-frequency components below the carrier frequency, and outputs it to the demodulation module.
所述解调模块包括依次相连的微分交叉相乘模块、差分放大器、积分器、高通滤波器和模数转换子单元，被配置为对两路低通滤波后信号的解调，输出解调后信号给控制器。The demodulation module includes a sequentially connected differential cross multiplication module, a differential amplifier, an integrator, a high-pass filter, and an analog-to-digital conversion subunit, configured to demodulate two low-pass filtered signals, and output the demodulated signal to the controller.
基于上述装置的方法，控制器连接两个直接数字频率合成器，设置其输出信号的频率和初始相位，使其输出载波信号、1倍频载波信号和2倍频载波信号；Based on the method of the above-mentioned device, the controller is connected to two direct digital frequency synthesizers, and the frequency and initial phase of its output signal are set to make it output carrier signal, 1-fold frequency carrier signal and 2-fold frequency carrier signal;
载波信号驱动激光器产生光信号给干涉光路，使载波信号与被测信号实现干涉，并输出干涉信号；The carrier signal drives the laser to generate an optical signal to the interference optical path, so that the carrier signal and the measured signal are interfered, and the interference signal is output;
控制器对模数转换模块采集得到的离散化干涉信号进行带通滤波，仅保留载波频率成份，与模数转换模块采集得到的离散化1倍频信号做对比，得到两路离散化信号峰值所对应的采集点位置，对两组采集点位置的差求和，当其小于设定阈值时，确认两组信号相位对齐，否则，调整输出载波信号的相位值，直到两组信号相位对齐；The controller performs band-pass filtering on the discretized interference signal collected by the analog-to-digital conversion module, and only retains the carrier frequency component, and compares it with the discrete 1-fold frequency signal collected by the analog-to-digital conversion module to obtain the peak value of the two discrete signals. For the corresponding collection point position, sum the difference between the two groups of collection point positions, and when it is less than the set threshold, confirm that the phases of the two groups of signals are aligned, otherwise, adjust the phase value of the output carrier signal until the phases of the two groups of signals are aligned;
相位对齐后的干涉信号分别与1倍频信号、2倍频信号混频，并进行低通滤波后，经过解调模块的微分交叉相乘模块、差分放大模块、积分模块和高通滤波模块处理后，生成最终解调信号，经过解调模块的模数转换子单元完成离散化，并送给控制器。The phase-aligned interference signal is mixed with the 1-fold frequency signal and the 2-fold frequency signal respectively, and after low-pass filtering, it is processed by the differential cross multiplication module, differential amplification module, integration module and high-pass filter module of the demodulation module , to generate the final demodulation signal, which is discretized by the analog-to-digital conversion sub-unit of the demodulation module and sent to the controller.
与现有技术相比，本发明的有益效果为：Compared with prior art, the beneficial effect of the present invention is:
(1)本发明采用程序控制的方式设定载波信号、1倍频信号和2倍频信号的相位，解决了干涉信号和倍频信号经过不同的光路与电路带来的相位不同步问题，提高了解调精度；(1) The present invention adopts the mode of program control to set the phase of carrier signal, 1 frequency multiplier signal and 2 frequency multiplier signal, which solves the phase asynchronous problem caused by interference signal and frequency multiplier signal through different optical paths and circuits, and improves demodulation accuracy;
(2)本发明实时采集干涉信号和1倍频信号，跟踪2路信号的相位差，并依据峰值点对应的采集点位置调整载波信号与1倍频信号、2倍频信号的相位差，消除了载波频率漂移引起的相位随机变化对解调结果的不利影响，进一步提高了解调精度。(2) The present invention collects the interference signal and the 1-frequency multiplier signal in real time, tracks the phase difference of the 2-way signal, and adjusts the phase difference between the carrier signal and the 1-frequency multiplier signal and the 2-frequency multiplier signal according to the position of the acquisition point corresponding to the peak point to eliminate The adverse effects of random phase changes caused by carrier frequency drift on the demodulation results are eliminated, and the demodulation accuracy is further improved.
附图说明Description of drawings
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.
图1是解调装置结构图。Figure 1 is a structural diagram of a demodulation device.
图2是解调方法流程图。Fig. 2 is a flow chart of the demodulation method.
图3是相位检测原理框图。Figure 3 is a block diagram of phase detection.
具体实施方式：Detailed ways:
下面结合附图与实施例对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
应该指出，以下详细说明都是例示性的，旨在对本申请提供进一步的说明。除非另有指明，本文使用的所有技术和科学术语具有与本申请所属技术领域的普通技术人员通常理解的相同含义。It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to 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.
需要注意的是，这里所使用的术语仅是为了描述具体实施方式，而非意图限制根据本申请的示例性实施方式。如在这里所使用的，除非上下文另外明确指出，否则单数形式也意图包括复数形式，此外，还应当理解的是，当在本说明书中使用术语“包含”和/或“包括”时，其指明存在特征、步骤、操作、器件、组件和/或它们的组合。It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.
术语解释部分：Terminology Explanation Section:
DCM：微分交叉相乘。DCM: Differential Cross Multiply.
正如背景技术所介绍的，现有技术中存在干涉信号和倍频信号经过不同的光路与电路，具有不同的相位延迟，从而导致解调信号信噪比严重恶化，解调精度下降的不足，而且光电子器件存在长期稳定性问题，会造成载波的频率漂移，使得干涉信号的载波信号与倍频信号的相位差呈现随机变化，进一步加大了解决问题的难度。为了解决如上的技术问题，本申请提出了一种基于相位程控的相位生成载波解调装置及方法。As introduced in the background technology, in the prior art, the interference signal and the frequency-multiplied signal pass through different optical paths and circuits, and have different phase delays, which lead to a serious deterioration of the signal-to-noise ratio of the demodulated signal and a decrease in demodulation accuracy, and Optoelectronic devices have long-term stability problems, which will cause the frequency drift of the carrier, making the phase difference between the carrier signal of the interference signal and the frequency multiplier signal show random changes, which further increases the difficulty of solving the problem. In order to solve the above technical problems, the present application proposes a phase generation carrier demodulation device and method based on phase programming.
本申请的一种典型的实施方式中，如图1所示，提供了一种基于相位程控的相位生成载波解调装置，由控制器、2个直接数字频率合成器、高稳定性温补晶振、3个放大器、激光器、干涉光路、2个混频器、2个低通滤波器、模数转换模块和解调模块组成。In a typical implementation of the present application, as shown in Figure 1, a phase-programmable phase generation carrier demodulation device is provided, which consists of a controller, two direct digital frequency synthesizers, and a high-stability temperature-compensated crystal oscillator , 3 amplifiers, a laser, an interference optical path, 2 mixers, 2 low-pass filters, an analog-to-digital conversion module and a demodulation module.
所述控制器输出2路数字总线，分别连接2个直接数字频率合成器，设置其输出信号的频率和初始相位；The controller outputs 2 digital buses, which are respectively connected to 2 direct digital frequency synthesizers, and the frequency and initial phase of the output signal are set;
所述控制器输出1路数字时钟信号，连接模数转换模块，提供模数转换的采样时钟；The controller outputs 1 digital clock signal, connects the analog-to-digital conversion module, and provides a sampling clock for analog-to-digital conversion;
所述控制器输入3路数字信号，分别来自模数转换模块的2路数字信号和解调模块的1路数字信号；The controller inputs 3 digital signals, respectively from 2 digital signals of the analog-to-digital conversion module and 1 digital signal of the demodulation module;
所述控制器由频率设置、相位设置、采样时钟、信号提取、同相检测5个功能模块组成；The controller is composed of five functional modules including frequency setting, phase setting, sampling clock, signal extraction and in-phase detection;
所述频率设置功能模块实现对2个直接数字频率合成器的频率设置；The frequency setting function module realizes the frequency setting to 2 direct digital frequency synthesizers;
所述相位设置功能模块实现对2个直接数字频率合成器的初始相位设置；The phase setting function module realizes the initial phase setting of 2 direct digital frequency synthesizers;
所述采样时钟功能模块产生模数转换模块的采样时钟；The sampling clock functional module generates the sampling clock of the analog-to-digital conversion module;
所述信号提取功能模块实现从解调模块的1路数字信号中提取被测信号的功能；The signal extraction function module realizes the function of extracting the measured signal from the 1-way digital signal of the demodulation module;
所述同相检测功能模块实现对来自模数转换模块的2路数字信号的相位检测；The in-phase detection functional module realizes the phase detection of the 2-way digital signal from the analog-to-digital conversion module;
所述2个直接数字频率合成器输出信号的频率和相位由控制器进行控制，具体的讲，是由控制器通过数字总线设定其频率控制字和相位控制字的方式来实现；The frequency and phase of the output signals of the two direct digital frequency synthesizers are controlled by the controller, specifically, it is realized by the controller setting its frequency control word and phase control word through the digital bus;
所述2个直接数字频率合成器输出3路信号，其中直接数字频率合成器1输出1路载波信号，直接数字频率合成器2输出1路1倍频载波信号和1路2倍频载波信号；The two direct digital frequency synthesizers output 3-way signals, wherein the direct digital frequency synthesizer 1 outputs 1-way carrier signal, and the direct digital frequency synthesizer 2 outputs 1-way 1-frequency carrier signal and 1-way 2-frequency carrier signal;
所述高稳定性温补晶振同时连接2个直接数字频率合成器，为其提供高稳定性时钟；The high-stability temperature-compensated crystal oscillator is connected to two direct digital frequency synthesizers at the same time to provide a high-stability clock;
所述3个放大器实现对2个直接数字频率合成器3路输出信号的放大，其中放大器1放大直接数字频率合成器1的载波信号，输出给激光器，放大器2放大直接数字频率合成器2的2倍频载波信号，输出给混频器2，放大器3放大直接数字频率合成器2的1倍频载波信号，输出给混频器1和模数转换模块；The 3 amplifiers realize the amplification of 3 output signals of 2 direct digital frequency synthesizers, wherein the amplifier 1 amplifies the carrier signal of the direct digital frequency synthesizer 1 and outputs it to the laser, and the amplifier 2 amplifies the 2 signals of the direct digital frequency synthesizer 2 The multiplied carrier signal is output to the mixer 2, and the amplifier 3 amplifies the 1-multiplied carrier signal of the direct digital frequency synthesizer 2, and is output to the mixer 1 and the analog-to-digital conversion module;
所述激光器由放大后的载波信号驱动，输出光信号给干涉光路；The laser is driven by the amplified carrier signal, and outputs an optical signal to the interference optical path;
所述干涉光路使载波信号与被测信号实现干涉，并输出干涉信号给2个混频器和模数转换模块；The interference optical path enables the carrier signal to interfere with the measured signal, and outputs the interference signal to two mixers and an analog-to-digital conversion module;
所述2个混频器分别实现干涉信号和1倍频载波信号、2倍频载波信号的混频，并输出给2个低通滤波器；The 2 mixers realize the mixing of the interference signal and the 1-fold frequency carrier signal and the 2-fold frequency carrier signal respectively, and output to 2 low-pass filters;
所述2个低通滤波器实现2路混频后信号的低通滤波，使滤波后信号只保留载波频率以下的低频成分，并输出给解调模块；The 2 low-pass filters realize the low-pass filtering of the signals after the 2-way frequency mixing, so that the filtered signals only retain the low-frequency components below the carrier frequency, and output them to the demodulation module;
所述模数转换模块以控制器给的采样时钟为基准，同步完成对干涉信号和1倍频载波信号的模数转换，输出给控制器；The analog-to-digital conversion module is based on the sampling clock given by the controller, synchronously completes the analog-to-digital conversion of the interference signal and the 1-fold frequency carrier signal, and outputs it to the controller;
所述解调模块由微分交叉相乘(DCM)模块、差分放大器、积分器、高通滤波器、模数转换子单元组成，DCM模块、差分放大器、积分器、高通滤波器、模数转换子单元依次连接，实现对2路低通滤波后信号的解调，输出解调后信号给控制器。Described demodulation module is made up of differential cross multiplying (DCM) module, differential amplifier, integrator, high-pass filter, analog-to-digital conversion subunit, DCM module, differential amplifier, integrator, high-pass filter, analog-to-digital conversion subunit Connect in sequence to realize the demodulation of the 2-way low-pass filtered signal, and output the demodulated signal to the controller.
如图2、图3所示，方法包括以下步骤：As shown in Figure 2 and Figure 3, the method includes the following steps:
第1步：初始化载波信号和倍频信号Step 1: Initialize the carrier signal and multiplier signal
控制器设置直接数字频率合成器1的频率和相位，频率为16kHz，相位是
其中，A1表示载波信号的幅度；t表示时间；Wherein, A 1 represents the amplitude of the carrier signal; t represents the time;
控制器设置直接数字频率合成器2的频率和相位，得到2路倍频信号分别为：The controller sets the frequency and phase of the direct digital frequency synthesizer 2, and obtains the 2-way multiplied signals as follows:
其中，A2表示1倍频信号的幅度；
第2步：信号干涉与采集Step 2: Signal Interference and Acquisition
激光器被放大后的载波信号驱动，产生相应的光信号并进入干涉光路，与被测信号干涉后，得到干涉信号：The laser is driven by the amplified carrier signal to generate a corresponding optical signal and enter the interference optical path. After interfering with the measured signal, the interference signal is obtained:
其中，I表示干涉信号；A4表示直流项幅度，为常数；B表示交流项幅度，为常数；C表示干涉信号中载波信号的幅度，为常数；
1倍频和2倍频信号经过放大器后，变为：After the 1-fold and 2-fold signals pass through the amplifier, they become:
其中，G表示放大后的1倍频信号幅度；H表示放大后的2倍频信号幅度；Among them, G represents the amplitude of the amplified 1-fold frequency signal; H represents the amplified 2-fold frequency signal amplitude;
第3步：相位对齐Step 3: Phase Alignment
如图2，图3所示。相位对齐步骤如下。As shown in Figure 2 and Figure 3. The phase alignment steps are as follows.
第3.1步，模数转换模块对干涉信号和1倍频信号进行模数转换并送给控制器。In step 3.1, the analog-to-digital conversion module performs analog-to-digital conversion on the interference signal and the 1-fold frequency signal and sends them to the controller.
第3.2步，控制器对干涉信号进行带通滤波，仅保留载波频率成份：In step 3.2, the controller performs band-pass filtering on the interference signal, and only retains the carrier frequency component:
其中，X1(n)表示干涉信号经过模数转换离散化，并且完成带通滤波后的信号；C′表示带通滤波后的信号幅度；N表示干涉信号在一个载波信号周期内被采集的点数，为常数；n表示采样点；
第3.3步，控制器接收到的1倍频离散化信号为：In step 3.3, the 1-fold frequency discretization signal received by the controller is:
其中，X2(n)表示1倍频信号的离散化值；Wherein, X 2 (n) represents the discretization value of the 1-octave signal;
第3.4步，控制器求出2路离散化信号峰值所对应的采集点位置，X1(n)的峰值所对应的采集点记为ni,ni+1,ni+2,ni+3,……；X2(n)的峰值所对应的采集点为nj,nj+1,nj+2,nj+3,……；In step 3.4, the controller calculates the position of the collection point corresponding to the peak value of the two discretized signals, and the collection point corresponding to the peak value of X 1 (n) is recorded as n i , n i+1 , n i+2 , n i +3 ,...; The collection points corresponding to the peak value of X 2 (n) are n j , n j+1 , n j+2 , n j+3 ,...;
第3.5步，对2组采集点位置的差求和：Step 3.5, sum the difference between the two sets of collection point positions:
D＝(ni-nj)+(ni+1-nj+1)+(ni+2-nj+2)+……(9)D＝(n i -n j )+(n i+1 -n j+1 )+(n i+2 -n j+2 )+...(9)
理想情况下，当D＝0时干涉信号载波成份的相位与1倍频信号的相位一致，但是考虑模数转换过程中时钟抖动、量化误差等因素，设定接近于0的阈值D1，当D≤D1即认为干涉信号载波成份的相位与1倍频信号的相位一致，完成相位对齐；Ideally, when D=0, the phase of the carrier component of the interference signal is consistent with the phase of the 1-multiplier signal. However, considering factors such as clock jitter and quantization error during the analog-to-digital conversion process, a threshold value D 1 close to 0 is set. When D≤D 1 means that the phase of the carrier component of the interference signal is consistent with the phase of the 1-fold frequency signal, and the phase alignment is completed;
如果D＞D1，控制器重新设置直接数字频率合成器1输出载波信号的相位，直到D≤D1，完成相位对齐。If D>D 1 , the controller resets the phase of the carrier signal output by the direct digital frequency synthesizer 1 until D≤D 1 to complete the phase alignment.
第4步：信号解调Step 4: Signal Demodulation
相位对齐后的干涉信号分别与1倍频信号、2倍频信号混频，并进行低通滤波后，得到：The phase-aligned interference signal is mixed with the 1-fold frequency signal and the 2-fold frequency signal respectively, and after low-pass filtering, the following is obtained:
其中，I1表示干涉信号与1倍频信号混频并进行低通滤波后的信号(第1路信号)；I2表示干涉信号与2倍频信号混频并进行低通滤波后的信号(第2路信号)；J1(C)和J2(C)是贝塞尔函数展开式的系数，为常数；Among them, I 1 represents the signal (the first signal) after the interference signal is mixed with the 1-frequency signal and low-pass filtered; I 2 represents the signal after the interference signal is mixed with the 2-frequency signal and low-pass filtered ( No. 2 signal); J 1 (C) and J 2 (C) are the coefficients of the Bessel function expansion, which are constants;
经过解调模块的微分交叉相乘模块，信号变为：After the differential cross multiplication module of the demodulation module, the signal becomes:
其中，IDCM1表示第一路信号经过微分交叉相乘后的信号；IDCM2表示第二路信号经过微分交叉相乘后的信号；
经过差分放大模块后，信号变为：After passing through the differential amplifier module, the signal becomes:
其中，V′表示2路微分交叉相乘后的信号差分放大的结果；Among them, V' represents the result of signal differential amplification after 2-way differential cross multiplication;
经过积分模块后，信号变为：After passing through the integration block, the signal becomes:
其中，V表示积分后的结果；M为积分常数；Among them, V represents the result after integration; M is the integral constant;
经过高通滤波模块后，信号变为：After passing through the high-pass filter module, the signal becomes:
其中，S表示高通滤波后得到的最终解调信号；Among them, S represents the final demodulated signal obtained after high-pass filtering;
该信号经过解调模块的模数转换子单元完成离散化，并送给控制器。The signal is discretized through the analog-to-digital conversion sub-unit of the demodulation module and sent to the controller.
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.
上述虽然结合附图对本发明的具体实施方式进行了描述，但并非对本发明保护范围的限制，所属领域技术人员应该明白，在本发明的技术方案的基础上，本领域技术人员不需要付出创造性劳动即可做出的各种修改或变形仍在本发明的保护范围以内。Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.
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