摘要
介绍了一种基于锁频锁相环(FPLL)的载波跟踪算法。频率跟踪模块可以适应较大动态范围的频率变化,基于软件的数控振荡器(NCO)模块可以达到极高的频率跟踪精度。由于有锁频环的频率牵引,锁相环路滤波器可以设计得很窄,具有很好的抑噪性能,满足精确跟踪载波相位的要求。因此,该基于FPLL的载波跟踪算法可以适应信号存在较大的动态范围和噪声干扰的应用环境;同时,其鉴频鉴相算法表达式简单,易于用可编程数字器件实现。
This paper introduces a carrier tracking algorithm based on FPLL. Frequency tracking module can achieve good performance when frequency changes in a large range and it can get high tracking accuracy using software NCO. Due to the frequency pulling of FLL, the passband of the filter in PLL can be made very narrow to suppress the noise, and the PLL can lock carrier’s phase with high accuracy. This based on FPLL algorithm works well in noise environment when input signal changes in a large dynamic range. The frequency and phase detection module is very easy to realize by programmable digital devices.
出处
《电子工程师》
2004年第12期30-33,共4页
Electronic Engineer
