The phase detecting error caused by local oscillator frequency drift and non - synchronization of measurement signal and gate signal is eliminated and the measurement speed is improved at the same time 该方法可以有效的消除因本振信号频率漂移及闸门信号与被测信号的非同步引起的测相误差,同时提高了测量速度。
It is included that the factors which affect the resonance frequency and how to reduce the affection , so that the magnetostrictive weak magnetic fiber optic sensor has a high sensitivity and good stability 给出了影响共振频率的因素及解决频率漂移的办法，从而得到既有很高灵敏度又有很好稳定性的光纤直流弱磁场传感器。
Both ip - iq approach and id - iq approach need low pass filters , as a result the accuracy of harmonic current detection is influenced by frequency drift . moreover , they both can only be used in three - phase power systems I _ p - i _ q法和i _ d - i _ q法都需要低通滤波器，因而会使谐波电流检测精度受到电源频率漂移的影响，而且这两种方法仅适用于三相电力系统。
The technical noduses of the harmony loading system , such as multi - channel signal synchroniza - tion , signal phase modulating and frequency excursion control are discussed . the key steps and actualization details are also provided 同时，论文探讨了协调加载控制系统的主要技术问题，如多余力、多通道相位协调和频率漂移的控制等，并给出了系统实现的细节。
Bits supplies the synchronous timing signal to these equipments inside the telecommunicationt building , such as dps , atm , no . 7 , dxc , tm & adm in sdh , don and in etc . the related techniques are involved in the content of synchronization ne twork , timing distribution , the timing signal transportations x impairments etc . the second chapter tells the structure and the function of the building integrated timing system . the third chapter summarizes the digital synchronization network techniques , which emphasizes the basic concept of synchronization networks analyzes the necessity of building the synchronization network and introduces all kinds of synchronization methods . the fourth chapter represents the transportation of the synchronization signal 本文第二章讲述了通信楼综合定时系统的构成及作用：第三章概述了数字同步网技术，着重描述了同步网的基本概念，分析了建立同步网的必要性，讲述了各种同步方法；第四章阐述了同步定时信号的传输；第五章介绍了bits设备所支持的同步状态消息；第六章、第七章为本文的重点，通过对时钟信号建立数学模型，从理论上分析时钟内部噪声和相位瞬变产生时钟定时信号损伤的原理，企图寻找到更好地控制频率漂移的方法。
The emphasis was put on the main factors affecting its performance , such as : drift of the average frequency of interferometer ; drift of frequency difference of interferometer ; the changes of the interference add - on term of the gaussian beam during the measurement and its effects on the phase changes , as well as the relationship between the changes of the interference add - on term of the gaussian beam during the measurement with the movement of the measurement mirror 对双频激光干涉仪的工作原理进行了理论分析，着重分析了其主要影响因素：双频激光平均频率漂移；双频激光差频漂移；高斯光束干涉附加项在测量过程中的变化及其对相位变化的影响，与测量镜运动引起的程差变化的关系。
