The four-step phase-shifting algorithm for quantitative analysis of the Ronchigram is derived from the wave theory of Ronchi test.
通过传统的朗契检测法的物理光学原理和条纹分析中的相移技术相结合，推导出了定量分析朗契图的四步相移算法，从而为朗契检测法定量进行像质评价提供了一种简单而有效的方法
Studied are the structure and operation principle,spectrum property,correlation property of OCDMA encoder/decoder based on quarternary phase shifted superstructure fiber Bragg grating(SSFBG) by using transmission matrix method.
利用传输矩阵法研究了四相移超结构光纤布拉格光栅(SSFBG)光码分多址(OCDMA)编/解码器的结构和工作原理、频谱特性、相关特性。
Based on analyzing the modulation and demodulation principle for QDPSK signal, an improved modulation solution for QDPSK signal based on FPGA is proposed.
在分析四相相对移相QDPSK信号调制解调原理的基础上,设计一种由FPGA实现的改进的数字化QDPSK信号调制系统,在信号的调制过程中将码元的调制波形分为稳定区和过渡区,并通过调用不同包络衰减函数的正弦函数样值序列来产生调制波形,该系统调制信号高频分量少,解码误码率较低。
A new OCDM technology of QPSK coherent phase encoding in time domain for Tbit/s ultra-fast optic fiber transmission system is proposed according to family a of 4-phase sequences, which can improve the transmission rate and spectral efficiency greatly.
介绍了光码分复用(OCDM)的原理,分析比较了常用OCDM技术的优缺点,根据四相位序列中的A序列提出了用四相相移键控(QPSK)实现时域相干相位编码的OCDM新技术,并通过数值模拟计算选出了相关特性好的4个码组,用于实现Tbit/s超高速光纤传输实验系统,可大大提高传输速率及频带利用率。
The technology of complete digital QPSK(Quaternary Phase Shift Keying) modulation and demodulation is suitable for the digital communication in the future for its flexibility and versatility.
数字信号的四相相移键控调制与解调技术以其灵活性和通用性而得到广泛的应用,符合未来数字通信技术发展的方向。
In order to study the ambiguity function character of the QPSK radar signal to help the choice and design of the radar signals,the paper has built models by Simulink to simulate two different modulation ways that produce the QPSK signals,and then leads the signals\' data to the Matlab\'s workspace and plots the ambiguity diagram respectively.
为便于雷达信号的选择与设计,从研究四相移相键控(QPSK)雷达信号的模糊函数特性入手,通过Simulink建模和仿真2种不同的产生QPSK信号的调制方法,并将信号数据导入到Matlab的工作空间中,由Matlab分别画出其模糊函数图;指出并论证了与2路码长互素码速率相同的BPSK正交构成QPSK的调制方法相比,直接QPSK调制方法的优越性。
Study on Four-Step Phase-Shifting Decoding Algorithm for Three-Dimensional Profilometry
面向物体表面测量的四步相移光解码技术研究
four-barrel step and repeat camera
四镜头分步重复照相机
Design and Simulation of L-band Four-bit Digital Phase Shifter Based on ADS
L波段四位数字移相器的设计与仿真
Chaotic Intensity and Phase Synchronization in Four Single-Mode Lasers;
四台单模激光的混沌强度和位相同步
Realization of the Control of the Four Phase Stepper Motor with Siemens PLC
西门子PLC对四相步进电机控制的实现
The raster stripes are encoded in 7 digit binary codes obtained by bisection and the phase shifting is performed by a sine function of 8 step shifting in π/4 interval.
光栅投影条纹采用逐步二分的二进制7位码编码,相移采用间隔π48步相移的正弦相移技术。
Analysis and comparison of errors in several phase stepping algorithm with an arbitrary step
几种任意步距步进相移算法的误差分析与对比
Design and Realization of High Precision Clock Synchronous Micro-step Phase-Shifter
高精度时钟同步微步移相器的设计与实现
In-Phase Self-Synchronous Process of Self-Synchronous Vibrating System with Vibrators Deviating from Its Center of Mass
偏移式同相回转自同步振动机自同步过程
The Research of a Spatial Rolling-walk Mobile Mechanism Based on Four-bar Mechanism;
基于四杆机构的空间滚动步行移动机构研究
Research on Gait Planning and Foot Force Control of the Quadruped Robot;
四足移动机器人步态规划与足力控制研究
Both numbers may slide synchronously in opposite directions.
两数可以同步地向相反方向移位。
Seismic forward modeling by fast variable step phase-shift interpolation.
快速变步长相移插值法地震正演模拟
The Researches on the Correlation of PARP with the Metastasis of Colorectal Carcinoma;
PARP与大肠癌侵袭转移相关性初步研究
Optical experimental verification of two-step generalized phase-shifting interferometry
两步广义相移干涉术的光学实验验证
Screening of Candidate Proteins Interacting with Lung Cancer Metastasis-related Protein 1 (LCMR1);
肺癌转移相关蛋白（LCMR1）相互作用蛋白的初步筛选
Five paces by four and a half.'
五步长四步半宽。”
Of, relating to, or involved in locomotion.
运动的四处移动的、与之相关的或参与其中的