一种改进的Costas环设计方法

A Design of Improvement on Costas Loop

针对非相干模式下输入载波精确测量问题,提出了一种基于周期反馈模式的Costas环改进方法。系统开环测量相位差、频差;闭环反馈误差信号,完成对输入载波的同步,建立了其数学模型,应用System View进行仿真实验,仿真结果证明改进的Costas环在非相干模式下完成与载波同步的同时,能够实现对输入载波相位差、频差精确测量。

Arming to the precisely measure of input carrier in incoherent mode, the article designes a model based on the feedback cycle of the Central Costas. In the open-loop model system measures the phase difference measurement, frequency difference,while in closed-loop model system feedback the sampling error signal input to the complete of the carrier synchronization. The establishment of a mathematical model is to prove the improvement in the ring with Costas incoherent carrier synchronization at the same time, to complete the importation of carrier phase, the accurate measurement of frequency difference. The result of simulation proves that the approach is effective.