摘要
在信号跟踪环节中,载波跟踪是关键部分,而载波跟踪的改进主要体现在载波环路滤波器的设计上.为了均衡载波同步的跟踪精度、环路带宽与快速同步3者之间的矛盾,提出了基于相位锁定检测量的自适应可变带宽的锁频环(FLL)与锁相环(PLL)相结合的跟踪方案,同时利用可控根法来完成数字环路滤波器参数的设计.由仿真结果得出可控根法可直接设计数字滤波器参数而不依赖模拟概念,同时基于自适应变带宽的锁频辅助锁相跟踪环路可以扩大锁定范围,适应更高动态,自适应变带宽可以在不影响锁定精度的条件下缩短锁定时间,达到快速同步.此方法可折中载波跟踪的各性能,达到平衡状态.
The carrier tracking is a key part in the signal tracking, and the carrier tracking improvement is mainly reflected on the design of the loop filter. In order to balance the contradiction among the tracking precision, loop bandwidth and the fast synchronization, the tracking method of FLL-assisted-PI.I. based on the algorithm of the adaptive bandwidth and the phase lock detector is put forward, and at the same time, the controlled-root is used to complete the parameter design of the digital loop filter in this method. The simulation results show that the digital filter parameters can be directly designed by the meth- od of controlled-root and not rely on the analog concept, and the FI.L-assisted-PI.I. tracking loop can expand the scope of the lock, adapt to the higher dynamic environment, achieve the fast synchronization based on the adaptive bandwidth. This method can compromise and balance the performance of the carrier tracking.
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2015年第6期27-32,共6页
Acta Scientiarum Naturalium Universitatis Nankaiensis
基金
国家自然科学基金(61271423)
