工业控制网络与系统研究室知识库

本发明涉及一种用于FSK信号的快速载波频偏估计及校正的方法。该方法通过输入经过射频模块产生的低中频I/Q两路信号，与DDS产生的信号进行相关运算及滤波处理，再进行均值运算，在事先存入的均值-频偏查找表中进行对应查询即可对频率偏差估计估计值，再把这个值反馈给前面的DDS就可以进行频偏消除完成频偏校正过程。本发明载波频偏估计速度快，在进行频偏校正后可以提高接收机的整体性能。

The invention relates to a method of quickly estimating and correcting carrier frequency offset for a FSK (Frequency Shift Keying) signal. According to the method, through inputting two ways of low and medium-frequency I/Q signals generated via a radio frequency module, correlation operation and filter processing are carried out on the two ways of signals and signals generated by a DDS, mean operation is then carried out, corresponding querying is carried out in a pre-stored mean-value-frequency offset lookup table, a frequency offset estimation value is obtained, the value is then fed back to the front DDS for frequency offset elimination and thus, a frequency offset correction process is completed. The frequency offset estimation speed is fast, and the overall performance of a receiver can be improved after frequency offset correction is carried out.