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。
Due to the frequency pulling of FLL, the passband of the filter in PLL can be made very narrow to suppress the noise, and the PLL can lock carrier's phase with high accuracy.
在分析伪码和载波跟踪环性能的基础上，给出了跟踪环路的最优带宽。
Based on the performance of PN code and carrier tracking loop, an optimal loop bandwidth is presented.
本文提出了一种专门用于数字VSB解调的载波相位跟踪环。
This paper proposes a carrier phase tracking loop dedicated for VSB demodulation.
低阶锁相环跟踪频率斜升信号时产生的稳态相差致使环路失锁，接收机无法锁定载波信号。
Due to steady phase error, low-order PLL has a trouble in tracking frequency ramp signals, so that the receiver cannot lock carrier signals.
在跟踪方面，采用了基于卡尔曼滤波的载波跟踪环来提高跟踪环的性能。
In tracking aspect, use carrier tracking loop based on Kalman filter to improve tracking performance.
基于非相关早减迟延时锁定环和反正切载波跟踪环，得出了由一般形式的误差解析表达式导出的码相和载波相位跟踪误差曲线。
Based on noncoherent DLL and arctan carrier PLL, the curves of tracking errors in general forms are given after a series of computing and simulation.
在噪声环境下，分析了载波频差对码跟踪环输出的影响。
Then we discuss the influence of frequency offset on code loop in the noisy environment.
针对该问题，本文基于扩展卡尔曼滤波方法提出了一种准最佳的GPS载波跟踪环结构设计方案。
Aiming at this problem, a new quasi-optimal structure of GPS carrier tracking loop based on extended Kalman filtering is proposed in this dissertation.
文章最后基于最大似然估计和线性卡尔曼滤波方法提出了一种理论上的最佳GPS载波跟踪环结构设计方案。
Finally, a theoretically optimal structure of GPS carrier tracking loop based on maximum likelihood estimation and linear Kalman filtering is proposed in this dissertation.
最后将码跟踪环与载波跟踪环路耦合对采集的GPS信号闭环跟踪，并对不同信号强度下的跟踪结果进行对比分析。
Finally, code loop and carrier loop are coupled together to track GPS signal in close loop, and analyze of different performances on track loop under different signal intensity is given.
同时，降低载波环噪声带宽，减小码环相关间隔，从而提高了载波环和码环的跟踪精度。
Additionally, the carrier loop noise bandwidth and the correlator spacing are reduced. Then the accuracy of carrier and code tracking loops is improved significantly.
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。
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.
针对极低信噪比高动态条件下载波同步问题，采用锁频环（FLL）和锁相环（PLL）相结合的方法来实现载波跟踪。
To the question of Carrier Synchronization with low signal-to-noise ratio (SNR) and High Dynamic , using the method of combining FLL with PLL to actualize the carrier tracking.
载波跟踪环用于对接收信号的载波频率进行精确跟踪，而码跟踪环是用于实现伪随机码延时的精确对准。
The former is used to achieve the fine estimation of the carrier frequency while the later is used to achieve the fine estimation of the code delay of the PRN code.
载波跟踪环用于对接收信号的载波频率进行精确跟踪，而码跟踪环是用于实现伪随机码延时的精确对准。
The former is used to achieve the fine estimation of the carrier frequency while the later is used to achieve the fine estimation of the code delay of the PRN code.
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