As the main research institute of ring laser gyroscopes in china , teaching and research section 208 , nudt , is always puzzled by the problem of null - shift in the process of developing mechanically dithered ring laser gyroscopes ( mdrlg ) . the problem is that the mdrlg ' s null shift equal to the integral times of dither periods when the sample time is set as integer dither periods 作为国内激光陀螺主要研制单位的国防科大208室，在机械抖动激光陀螺(机抖陀螺)研制过程中一直为零漂问题所困扰：实验测得机抖陀螺零漂为抖动周期(采样时间取整数个抖动周期)的整数倍。
Based on analysis on the generation mechanisms of auto - correlation peaks , acm is combined with average technique in correlation domain . average technique not only smoothes noise correlation lines , but also makes all potential positions of generating auto - correlation peaks generate auto - correlation peaks of dsss / bpsk signal . the improved acm obtain lower snr limitation successfully 在分析时域自相关法相关峰出现机理的基础上,将该法与相关域迭加平均技术结合,既平滑了噪声又使各延迟时间为扩频码整数倍周期处均出现相关峰,实现了更低信噪比下的码周期估计。
6 % ) , its downtrend and uptrend were steep and its isis had two significant inflexion hi the trough . integer multiple pattern ( 7 . 7 % ) , its isis showed clear layered structure . there existed a basic isi and other isis were concentrated at about integer multiples of the basic isi 6 ，其下降支与上升支较为陡峭，且下降支与波谷以及波谷与上升支之间有两个明显的拐点；整数倍形占77 ， isi在连续变化的过程中显示分层结构，各层的isi为基础isi的整数倍；弥散形占6
Fpga and dvb standard are introduced firstly , dvb - c standard and composition of its system are analyzed completely , development of modulator structure and dvb - c digital modulator composition are presented , more over , analysis of respective modular are given . then , principle of dvb - c digital modulator system are presented , they are error control technique 、 mqam 、 nyquist rule and root raised cosine filter 、 window design method for fir filter 、 multi - rate signal processing ( integer interpolating , conversion of fractional sampling , equal conversion of net structure , polyphase structure for filter , poly - phase structure for interpolator , multi - stage implementation of samplying conversion ) 、 distrubited algorithm 、 cic filter 、 dds 、 cordic algorithm 接着,专门利用一个章节阐述了dvb - c前端调制系统原理,他们了差错控制技术、多进制调制( mqam ) 、 nyquist准则与平方根升余弦滤波器、有限冲击响应滤波器的窗函数设计法、多抽样率信号处理包括(整数倍内插原理、分数倍抽样率转换、网络结构的等效结构、滤波器的多相表示、内插器的多相表示、抽样率转换的多级实现) 、分布式算法、 cic滤波器、直接数字频率合成( dds ) 、 cordic算法。
In this paper , a method assessing harmonic impedance by synchronously layered distortion waves is proposed , which is based on the " fluctuations method " - a simple and effective means . however the method is based on the fourier transform , which can just precisely analyze the signals whose cycle is integer times as broad as that of fundamental wave . with sampling windows widening , the variations of distorted signals in a fundamental period are weakened 本文是以一种被广泛采用的非干预式谐波阻抗估计方法? ? “波动量”法，的基础上，针对现有方法以直接的fourier变换为分析工具，只能对基波周期的整数倍窗口采样信号进行分析，畸变信号在一个基波周期内的变化随采样窗口增大而被弱化，并且，谐波次数越高，分辨率就越低，大大限制了谐波阻抗估计的准确性的提高。
According to the nonlinear dynamical features of isi series , the firing pattern can be described as : ( 1 ) periodic firing pattern , which was characterized by repeated appearance of isi at regular interval . ( 2 ) bursting firing pattern , which was characterized by bursting interrupted by silent periods . isis of the action potential during the bursts were confined to a banding area 在观察到的101例损伤drg神经元自发放电中，依据其动作电位isi的动力学特征，可分为周期，其isi基本相等；阵发，在短阵放电之间有不规则的间断；不规则，其isi互不相等；整数倍，其isi为基础isi第四军医大学硕士论文的整数倍等四种基本型式。
In sso , the thickness of each stack of the laminate must be integer times as thick as that of single ply , the angle of each stack of the laminate is selected from a set of standard angles , and the stacking sequence can change arbitrarily . when material and ply angles of the laminate are selected , ga is used to giye the optimal laminate that meets the given requirements of thickness and geometry factors 在550中，层合板各分层的厚度必须是单层材料厚度的整数倍，铺层角取作一些标准的角度，各分层在层合板厚度方向上的相对位置可任意变化，利用ga求出满足给定厚度和几何因子要求的层合板最优铺层结构。
