SU Yi, XU Ze-wei, LIU Chen. Signal carrier frequency estimation algorithm for electromagnetic wave measurement while drilling based on improved DSSS[J]. 2016, 35(6): 117-119+123.
SU Yi, XU Ze-wei, LIU Chen. Signal carrier frequency estimation algorithm for electromagnetic wave measurement while drilling based on improved DSSS[J]. 2016, 35(6): 117-119+123. DOI: 10.13873/J.1000-9787(2016)06-0117-03.
改进的DSSS电磁波随钻测量信号载频估计算法
摘要
为了解决随钻测量中电磁波信号的载频估计问题
基于直接序列扩频(DSSS)通信原理
建立了改进的电磁波信号载频估计法
该方法采用信号自适应干扰对消技术滤除噪声信号
然后再通过带通滤波技术获得DSSS信号的频带
从而提高了信号的信噪比(SNR)。在此基础上
建立了System View仿真模型
仿真结果表明:改进的载频估计法可以有效滤除噪声信号
精确地检测出电磁波信号的载波频率。
Abstract
In order to solve problem of carrier frequency estimation of electromagnetic wave signal in measurement while drilling
an improved carrier frequency estimation method is established based on direct sequence spread spectrum( DSSS). This method adopts adaptive interference cancellation technique to eliminate signal noise.Then
the frequency band of the DSSS signal is obtained through band-pass filtering
so then signal noise ratio( SNR) is improved. On this basis
System View simulation model is established. Simulation results show that the improved DSSS can effectively eliminate noise signal and accurately detect carrier frequency of electromagnetic wave signal.