This paper introduces the phase modeling estimation method and smooth phase difference estimation method,presents the merits & demerits and application conditions of two methods,simulation test shows the effectiveness of two methods.
信号的瞬时频率经常被用在非平稳信号处理中,为了在高斯白噪声背景下对线性调频信号(LFM)的瞬时频率进行准确估计,介绍了采用相位建模估计法和平滑相位差分估计法,分析了两者各自的优缺点和适用条件,仿真试验表明两种瞬时频率估计方法的有效性。
Study on phase ambiguity resolution of QPSK digital demodulation;
QPSK数字化解调相位模糊校正方法研究
A novel multistage frequency offset estimation algorithm based on time-domain training sequence was proposed to avoid the conflict between estimation accuracy and estimation range The algorithom gradually approached through multiple stages and removed the phase ambiguity in every stage,so.
该算法采用多步逐次逼近,在每一步估计中消除相位模糊,在不缩小估计范围的前提下不断提高估计精度;最后利用最佳线性无偏估计(BLUE)方法将各步估计值进行最佳合并,进一步提高估计精度。
Algorithms,such as automatic frequency control(AFC),automatic gain control(AGC),phase-amplitude tracking(PAT),and phase ambiguity detecting (PAD),were jointly used in this scheme.
综合应用自动频率控制(AFC)、自动增益控制(AGC)、相位/幅度跟踪、相位模糊检测等算法,在没有任何训练序列的情况下,能准确地恢复调制信号载波相位。
Study of diffraction action of phase mask for optical fiber grating fabrication;
制作光纤光栅用相位掩模的衍射行为研究
Fabricating technology of fiber grating with phase masks;
用相位掩模法制作光纤光栅的技术
8% peak reflectivity is fabricated in B/Ge co doped fiber by 248 nm KrF excimer laser irradiated a phase mask.
本文报道了以２４８ｎｍ的ＫｒＦ准分子激光为光源，用相位掩模技术在Ｂ／Ｇｅ双掺光纤上研制出反射率９８。
Using only one optic element,the phase mask provides a robust and inherently stable method for reproducing fiber Bragg gratings,and reduces the complexity of the fiber grating fabrication system.
由于相位模板法仅使用一个光学器件 ,因而减少了光纤光栅制造系统的复杂性 ,是光纤布拉格光栅写入法中最有前途、使用最广泛并且具有本征稳定性的一种方法 。
A customized optimization model of phase plate for Extended Depth of Field (EDOF) is introduced based on the various requirements of different EDOF optical imaging system.
从大景深成像系统实际所需要的景深、分辨率以及最小调制传递函数MTF响应值出发,本文建立了相位模板的个性化优化设计模型。
The depth of field of standard optical incoherent imaging system can be extended by introducing a phase plate and the digital image restoration technique.
在普通光学成像系统中引入相位模板和数字图像复原技术,可以增大系统的景深。
Analysis in X-ray Pulsar Navigation Phase Ambiguity Resolution
X射线脉冲星导航中相位模糊度解算
Microscopic Phase-Field Simulation of Antisite Defect Evolution of Al_3Li Phase
Al_3Li相反位缺陷演化的微观相场模拟
Modular seat section. Attach to other modular seats and tables.
模块式座位部分。与其他模块式座位和桌子相连。
MICROSCOPIC PHASE-FIELD METHOD SIMULATION FOR THE IN SITU TRANSFORMATION OF Ll_0 PHASE AND Ll_2 PHASE STRUCTURE
L1_0相和L1_2相结构原位转变的微观相场法模拟
Modular 30 degree outside-wedge seat section. Attach to other modular seats and tables.
外侧为 30 度的楔形模块式座位模件。与其它模块式座位和桌子相连。
Modular 30 degree inside-wedge seat section. Attach to other modular seats and tables.
内侧为 30 度的楔形模块式座位模件。与其它模块式座位和桌子相连。
An Experimental Study on in Vitro Chemical-Shift Opposed-Phased Imaging Phantom;
MRI化学位移同、反相位成像的体外实验模型研究
Atomistic Study of Interaction between Screw Dislocation and Vacancy Cluster Platelet in α-Zirconium
α锆中螺形位错与空位盘的相互作用模拟
Multiple models adaptive decoupling controller for nonminimum phase system using DBD technology
非最小相位逐维定位多模型自适应解耦控制器
Study on GPS-Galileo combined positioning based on relative positioning model
基于相对定位模型的GPS-Galileo组合定位研究
Adjusts horizontal phase/fine tunes computer analog image
调节水平相位/细调计算机模拟图像
Retrograde Counterpoint and Imitation and Other Pertinent Polyphonic Issues;
逆行对位与逆行模仿及相关问题研究
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
Modes of Unstable Resonators with Phase Gaussian Variable Reflectivity Mirror;
相位型高斯变反射率镜非稳腔的模式
The Simulation of Phase Modulation in Azimuth for Suppressing Range Ambiguity in SAR
SAR方位调相抑制距离模糊的效果仿真
Multi-phase image segmentation based on Chan-Vese model
基于Chan-Vese模型的多相位图像分割
Method of Fuzzy Control for Distribution Time of Multi-phase Traffic Signal
多相位交通信号配时的模糊控制方法
PANCHARATNAM PHASE IN DEFORMED JAYNES-CUMMINGS MODEL
变形Jaynes-Cummings模型中的Pancharatnam相位