Based on the above chosen scheme , the dissertation researches the principle and method of phase calculation . and after the comparison of various principles , the dissertation chooses a method that is suitable to the instrument . finally , a virtual phaser is designed and developed 基于上述确定的方案,论文深入研究了鉴相原理和方法,并在对各种鉴相原理进行比较后,确定出适合该仪器的方法,最后设计出虚拟式鉴相器。
In this method , the phase difference between two compared signals that have same nominal frequency can be converted into voltage signal by phase detector . the voltage signal varies linearly with the phase difference and can be displayed or recorded by some instruments 此方法是将两个被比对的标称值相同的标准频率信号之间的相位关系，通过线性鉴相器转换成与它成线性关系的电压信号，并通过相应的设备进行显示纪录。
This paper solves the two problems firstly , and then analyzes the performance of x47 phase - detector with the orcadipspice9 ? function of performance analysis , gives the theoretical analysis of it ? working principle , optimizes it with orcad / pspice9 software 本论文的工作首先是解决了这两方面的问题。在解决这两个问题的基础上，本论文用orcad pspice9软件分析了x47鉴相器的特性，从理论上分析了它的工作原理，并进行了优化设计。
Thus the principle to deal with the four basic waveforms is put forward and a new phase - demodulation circuit is designed . experiments for the two circuits on same gyros are made and they indicate clearly that the mdrlg ' s null - shift problem consists in the faultiness of the old phase - demodulation circuit 在此基础上，提出了处理计数信号过锁区波形的基本原则，进而设计了新的鉴相电路，并在同一陀螺上对两鉴相电路进行了对比实验。
Then the paper researches the operational principle and realization method of each subassembly of the digitized phase - locked loop , which includes numerical controlled oscillator , digital phase dectector , and digital filter etc . , and also discusses the method of improving the performance of each subassembly 接着阐述了数字化锁相环各个部件的工作原理及实现方法,包括数字控制振荡器,数字鉴相器,数字滤波器等,研究了改进各部件性能的方法。
Finally introduced the method that use adf4113 and provied the real test result of this multi - frequency , low phase noise pll frequency synthesizer with 30mhz working band and 1mhz frequency step . in addition , some method that solved the problem often occurred was introduced 最后给出了由ad公司的电流泵数字鉴频鉴相器adf4113和无源环路滤波器构成的频率合成器的控制方法和实验测试结果，实现了工作带宽30mhz ,频率步进1mhz的多点频、低相噪频率合成器。
This paper explicitly describes the optical measurement of the electric parameters in the high - voltage electric power system , and an optic fiber large current sensor based on farady magnetooptic effect and an optic fiber high voltage sensor based on the linear transformation characteristic of led are developed from research on both theory and experiments . by combining the two sensors to form a synchronous system , the task of harmonic analysis , phase demodulation , power and wattless power computation is accomplished , which helps to monitor and control the electric power system 本文详细论述了电力系统高压电网电参量的光学测量的一种实现方法，从理论和实验两方面研究了基于farady磁光效应的光纤电流传感器及基于led线性电光转换特性的光纤电压传感器，并联合两种传感器形成了电压、电流的同步测量系统，实现了谐波分析、鉴相及有功、无功功率的计算，可对电能质量进行监控。
The x47 phase - detector is an analog integrated circuit produced by the 24th institute of the information industry department . the main function of x47 phase - detector is to detect the difference of phases of its two input signals . but it ? erformance can not be analyzed by directly using the orcad / pspice9 ? - - - - a world - wide well known general purpose simulation software , and all circuits and systems using this kind of phase detector can not be directly simulated by orcad / pspice9 either X47鉴相器是信息产业部第24研究所设计生产的一种模拟集成电路，用于鉴别两路输入信号的相位，但是却不能直接用通用的电路模拟软件orcad pspice9分析其性能，使用x47鉴相器的电路和系统也不能直接用orcad pspice9进行模拟。
The basic operation principle of phase - locked frequency synthesizer and the type of circuits are expatiated systematicly in this paper . the principle of operation on sampling phase detector and some characteristics including the linear tracking and phase noise in phase loop circuits are analyzed deeply . the research is emphased on the theory and design method of circuits in the sampling phase - locked frequency synthesizer . then , the expansion capturing circuit is analyzed and designed for better performance of capturing loop circuits . at last , the loop filter is also analyzed and contrived taking account of effection of additional phase shift by the sampling - holder . the general research on the theory and technology of sampling phase lock in the paper will make a basement for the development of new product 本文系统的阐述了锁相频率合成器的基本工作原理及电路类型；较深入地分析了取样鉴相工作原理及电路、锁相环路的线性跟踪特性和相位噪声特性；重点对取样锁相频率合成器电路理论和设计方法进行了研究；为了改善环路的捕获性能，对扩捕电路进行了分析和设计，并用wewb32软件对电路进行了仿真；考虑到取样保持器的附加相移影响，对环路滤波器进行了分析和设计。
There are two uncertain factor about it : the phase of the pn code and the doppler - shift . after capturing the received signal successfully , the traditional ds receiver always uses a delay locked loop ( dll ) to synchronize the pn code and then uses a costas loop to realize the carrier synchronization . this complex closed - loop structure not only take long time to realize the synchronization , but also has the defect of “ hang up ” 传统的扩频接收机通常在捕获伪码信号后利用迟早门鉴相的延时锁定环来实现伪码的精同步,解扩后利用科斯塔斯环实现载波同步,这种闭环结构不仅同步时间长、结构复杂,而且锁相环还存在所谓的“ hang - up ”现象。
