频率跟踪

频率跟踪移相PWM控制实现方案的研究。

Research on the reality of frequency tracking phase shift control strategy .

频率跟踪移相PWM控制下串联谐振式逆变器运行模式分析

Operation Mode of Series Resonant Inverter under Frequency Tracking Phase Shift PWM Control

基于FPGA技术的相位频率跟踪方法的研究

Research on Tracing Technology of Phase and Frequency Based on FPGA

基于FPGA的具有频率跟踪的自适应控制器研究

Study on Frequency-tracking Adaptive Controller Based on FPGA

该文提出了一种新的用于多径信道的基于判决反馈的OFDM载波频率跟踪算法。

A new OFDM decision-directed carrier frequency offset tracking algorithm is presented .

OFDM系统中的帧同步与频率跟踪算法

A Simplified and Effective Frame Synchronization and Frequency Tracking Scheme for Wireless OFDM Systems

OFDM系统中基于导符号和判决数据的频率跟踪环路

The Frequency Tracking Loop for OFDM Systems Based on Pilot Symbols and Decision Data

高动态条件下PN码扩谱接收机的频率跟踪策略

Frequency Tracking Algorithms for PN Spread Spectrum Receiver in High Dynamic Circumstance

基于DDS的超声换能器频率跟踪系统

Frequency Tracing System for Piezoelectric Transducer Based on DDS

提出了一种用于折射率仪的采用方波调制的微波高Q腔谐振频率跟踪系统，分析了其工作原理。

This paper presents a resonant frequency tracking system based on Square - wave modulation of a high Q microwave cavity .

DBD型臭氧发生器电源的频率跟踪移相PWM控制技术及其实现

A Frequency Tracking Phase Shift PWM Control Technology for DBD Ozone Generator and its Realization

本文采用理论分析与实验相结合的方法，从压电换能器的特性分析及频率跟踪两方面入手，深入研究了换能器fp附近的特性及频率跟踪问题。

Based on the method combining theory with experiment , the behavior of the piezoelectric transducer around its f_p and auto-frequency tracing are studied in this paper .

为进一步提高热超声引线键合超声电源的自动频率跟踪速度及精度，提出了基于现场可编程门阵列（FPGA）的超声电源设计方案。

To improve the speed and accuracy of automatic frequency tracking on thermosonic wire bonding , the design scheme based on FPGA was proposed .

基于改进DFT变换的高精度实时电网频率跟踪算法

A Precise Real Time Frequency Tracking Algorithm in the Power System Based on the Improved DFT Algorithm

Matlab平台上的仿真结果表明：该算法计算精度较高，对二次谐波有一定抑制作用，能较好地满足电力系统实时频率跟踪的要求。

Matlab simulation results show that the algorithm is suitable for instantaneous power system frequency tracking with higher accuracy and a certain suppression of second harmonic .

重点研究了基于FPGA的全数字锁相环频率跟踪技术和数字化SPWM实现技术。

All Digital Phase-Locked Loop frequency tracking and digital SPWM realization technology based on FPGA are emphasized in the research .

在此基础上编制了系统的程序，并对其进行了调试，实验证明基于DSP的软件锁相环可以达到超音频范围的频率跟踪要求。

Experiments show that the Software Phase - Locked Loop based on DSP can fulfill the requirement of frequency-tracking task at the range of ultra-audio frequency .

研究了以功率MOSFET为开关管的串联谐振逆变器的频率跟踪问题。

The paper analyzes the phase-lock technique of serial resonant inverter with power MOSFET as switching device .

UPFC物理模型的频率跟踪问题研究

Explore in Frequency Tracking Problem of UPFC Physical Model

提出一种DBD型臭氧发生器电源频率跟踪移相PWM控制技术的实现方案。

A frequency tracking phase shift PWM control strategy for DBD ozone generator is proposed in this paper .

在对现有各种感应加热装置功率控制方式比较的基础上，提出一种基于频率跟踪的新型的、较优的PWM功率调节方式。

Based on comparing with the different power modulation , a novel and better PWM based on follow tracing is proposed in this paper .

提出了一种快速的正交频分复用（OFDM）系统载波频率跟踪算法，该方法采用基于变步长的自适应滤波算法。

This paper proposed a fast frequency tracking scheme for orthogonal frequency-division multiplexing ( OFDM ) system based on variable step size adaptive filtering algorithm .

以锁相环作为频率跟踪的核心器件，根据最佳死区的计算方法，用DSP实现了死区的在线调节。

Phase looked loop was used as the core equipment of frequency following , on-line adjustment of dead time realized by DSP which depend on the best dead time calculate method .

提出一种具有功率因数校正（PFC）的无相差频率跟踪控制清洗设备用超声波电源。

An ultrasonic power supply for cleaning equipments with power factor correction ( PFC ) and non-phase-difference frequency tracing technology is developed .

系统的分析了频率跟踪移相PWM控制全桥供电的串联谐振负载式DBD型臭氧发生器电源系统的工作过程。

The working processes of the frequency-tracking phase-shift PWM controlled full bridge power supply load series resonant type DBD ozone generation power system are analyzed .

此外，作者还对CP类型检测、小数倍频偏估计、辅同步信号检测以及频率跟踪算法进行了性能和复杂度分析，并在此基础上提出了一种TD-LTE小区搜索和下行同步过程的完整设计方案。

In addition , the author discuss the CP type detection , frequency offset estimation , SSS detection and frequency tracking algorithms .

利用接收机判决后的OFDM信息数据重构FFT以前的OFDM信号，提出了一种OFDM系统中频偏估计的新方法，进而得到一种载波频率跟踪方法。

Based on the data after decision in OFDM receiver , those data before FFT can be reconstructed . Using them , a new frequency offset estimation method is developed .

频率跟踪模块采用单片机，实现VCO的输出频率与谐振腔的谐振频率实时相等。

Frequency tracking module uses MCU and realizes that the output of VCO is equal to resonant frequency of the resonator .

结果表明，PLL存在环路滤波纹波、前置滤波延迟和自身滤波延迟等方面的因素，对PLL的频率跟踪精度产生不良影响，且无法消除。

Results show that PLL is of the factors such as loop filtering ripples , pre-filtering delay and PLL loop filtering delay , which can cause insu .

异地同步方法误差远小于同步测量环节本身的误差，后者主要由PMU的频率跟踪与测量、信号滤波延迟以及数值算法等环节引起；

The later is mainly caused by frequency tracking and measurement of PMU , the signal filter delay and the digital algorithm .