一种基于FLL和PLL的复合载波环的跟踪精度分析

Accuracy analysis of the composite carrier loop based on FLL and PLL

基于卫星通信高动态、高精度的需求,提出了一种锁频环与锁相环相结合的双环载波跟踪系统。通过分析热噪声和动态应力对载波环跟踪精度的影响,指出了锁相环和锁频环的优缺点,给出了复合载波环的结构框图和工作流程。最后通过系统仿真,证明了复合载波环比单一载波环具有更全面的性能。

In order to satisfy the requirement of the tracking accuracy and the high dynamic, the design of the composite carrier tracking loop based on FLL and PLL is proposed in this paper. With the analysis of the tracking accuracy impacted by the thermal noise and the high dynamic, the merits and drawbacks of PLL and FLL are proposed, and then the structure diagram and tracking procedure of the composite carrier loop is given. At last with the simulation by matlab, the comprehensive performance is revealed.