隐式自校正算法在锁相环中的应用

Applications of implicit self-tuning control algorithm in phase lock loops

针对锁相环中晶体振荡器受温度影响的时变和不稳定等特点,在递推辨识算法的基础上提出一种自校正控制和前馈补偿相结合的方案,即隐式自校正控制方案。该方案根据辨识得到的系统参数设计控制器调节系统,使输出信号方差变化最小。将此算法应用到锁相环的自适应预测模块中,并用MATLAB软件仿真验证此算法,仿真结果表明,使用隐式自校正控制算法后,不仅能优化系统的辨识参数,而且输出信号的变化也趋于稳定,可以满足锁相环中输出信号跟踪输入信号的要求。

In view of time-varying and instability of crystal oscillators in phase lock loops due to the effects of temperature,a scheme of implicit self-tuning control combined with forward compensation is proposed on the basis of the recursive identification algorithm,i.e.implicit self-tuning control algorithm.This scheme designs the controller regulating system in accordance with the parameters obtained from the identification so as to minimize the output signal variance variations.Application of this algorithm in the self-tuning prediction modules and simulation and validation of this algorithm by using MATLAB show that application of this algorithm can not only optimize the system identification parameters,but also considerably stabilize the output signals,satisfying the requirement of the output signals in phase lock loops to track the input signals.