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. In the signal tracking, carrier tracking is the key part, and carrier tracking improvement is mainly reflected in the design of the carrier loop filter.In order to balance the carrier synchronization tracking accuracy, loop bandwidth and fast synchronization of the three contradictions, A novel tracking scheme based on FLL with PLL is proposed based on phase lock detection. At the same time, the controllable root method is used to design the digital loop filter parameters. The simulation results show that the controllable root method can directly design the digital filter parameters without relying on the analogue concept. At the same time, the frequency-locked Auxiliary Phase-Locked Loop based on adaptive variable bandwidth can expand the range of locking and adapt to higher dynamic and adaptive variable The bandwidth can shorten the lock time under the condition of not affecting the locking accuracy to achieve fast synchronization, which can compromise the performance of carrier tracking and reach the equilibrium state.