According to the features of the signal of cmf , i . e . the signal frequency varies in a small range and the signal is subjected to the harmonics , a digital method based on a digital phase locked loop is used to process the signals of cmf , tracks the change of the signal frequency and calculates the phase difference . the technique proposed by the u . s . patent has been improved and made the simulation 针对科里奥利质量流量计信号的特点，即信号频率在小范围内变化和信号易受谐波干扰的特点，采用基于数字锁相环的方法处理科氏质量流量计的信号，跟踪信号频率的变化，计算相位差，对美国专利提出的方法进行了改进，并作了仿真。
Because of the structure of the traditional polarization diversity and combining scheme is too complex , after researching the polarization diversity and diversity combining technology , a new structure of receiver is proposed . in this structure the uniform sampling second - order dpll is used to remove the frequency bias after frequency discrimination 该结构控制较为复杂,为此结合实际项目要求,在研究了极化分集接收关键技术的基础上,提出了一种改进的极化分集接收机结构,即在鉴频之后利用均匀采样二阶数字锁相环误差传递函数的高通特性去除各种频偏分量。
This thesis introduce the design of dsp control for three phase inverter , witch includes digital realization of pwm control , digital pll , swap control between inverter and utility , and communication with mcu . base on inverter model , inverter output l - c filter is investigated , and double - loop control scheme with tms320lf240 are selected 本文主要介绍了基于dsp控制三相逆变器系统的总体设计方案，其中包括spwm控制的数字实现、逆变器输出电压的数字锁相、逆变器与旁路间的切换逻辑及逆变器与上位机的通讯。
Then we uses the scheme that has the variable gain based on the kalman filtering model realize two steps phase - locks ring circuit track technology , this kind has the advantage that when changed the gain the digital phase - lock link to be allowed simultaneously to realize the fast capture and the reliable track , the simulation analyzes its capture performance 仿真结果表明,自编码直扩通信系统的编码捕获性能具有可行性。采用基于卡尔曼滤波模型实现具有可变增益的二阶锁相环路的跟踪技术,这种具有时变增益的数字锁相环可以同时实现快速捕获和可靠跟踪,其捕获性能要比传统数字锁相环改善很多。
In case where long - range communication is needed , spatial diversity blind equalizer ( sdbe ) is an effective way to improve snr and suppress distortion . joint carrier phase recovery with sdbe using second order digital phase lock loop is presented to track the doppler shift , and a kind of quantization method is used to reduce the complexity of the multi - channel algorithm . its performance is very similar to the original one 仿真结果表明，采用二阶数字锁相环的空间分集均衡算法的跟踪性能超过了采用一阶锁相环和未加锁相环的算法，可有效补偿由于水声信道时变而引入的载波相位快速变化；采用误差量化的算法和原算法的收敛和踉踪性能都很接近。
