旧分选

介绍了一种基于锁频锁相环(FPLL)的载波跟踪算法。频率跟踪模块可以适应较大动态范围的频率变化，基于软件的数控振荡器(NCO)模块可以达到极高的频率跟踪精度。由于有锁频环的频率牵引，锁相环路滤波器可以设计得很窄，具有很好的抑噪性能，满足精确跟踪载波相位的要求。因此，该基于FPLL的载波跟踪算法可以适应信号存在较大的动态范围和噪声干扰的应用环境；同时，其鉴频鉴相算法表达式简单，易于用可编程数字器件实现。(Introduce an approach based on frequency-locking phase-locked loop (FPLL) carrier tracking algorithm. Frequency tracking module can adapt to a larger dynamic range of the frequency change, software-based numerical control oscillator (NCO) module can achieve the very high frequency tracking accuracy. Because of the frequency lock loop traction PLL filter can be designed very narrow, with very good noise suppression performance, to meet the precise requirements of carrier phase tracking. Therefore, the FPLL carrier-based tracking algorithm can be adapted to signal the existence of a larger dynamic range and noise of the application environment at the same time, the PFD algorithm expression is simple, easy to use programmable digital devices.)

PID水量控制仿真系统，通过对水量控制进行动画演示(The simulation system of water control based on PID and animation demonstration of water control)

<<Design Components with C++ STL>>是一本关于STL，模板编程的经典之做。 (This is a e-book about STL programming)

软件工程文档模板，软件需求规格说明书编写规范(Software engineering document template, software requirements specifications to prepare specifications)

SSD4 Exam3 from tutor

集合的添加元素，删除元素，置空集合，判断是否有交集(Collection to add elements, delete elements, set empty, to determine whether the intersection)

主要介绍jdbc实现数据库操作的一些细节(Mainly introduces the jdbc database operations to achieve some of the details)

birt是常用的一种开源报表开发工具，其中有些技巧性的与大家共赏(birt is a commonly used open source reporting tools, some skill with you Dramas)

面向对象和传统的方法 经典软件工程 第二章(object oriented and classical sofeware engineering)

电网规约信息，可以解析电网698规约报文 ，供广大同仁参考(Power grid protocol information can be used to analyze 698 power grid protocol message for reference by colleagues.)