随钻数据声波NC-OFDM传输及噪声抑制的研究  

Research on acoustic NC-OFDM transmission and noise reduction for logging while drilling data

作　　者：马东[1,2] 师奕兵[1,2] 张伟[1,2] 柳国振[1,2] 

机构地区：[1]电子科技大学自动化工程学院,成都611731 [2]电子科技大学信息地学研究中心,成都611731

出　　处：《仪器仪表学报》2017年第1期8-16,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然基金(61201131);国家"十二五"科技重大专项(2011ZX05020-005)项目资助

摘　　要：随着随钻测井技术的高速发展,多维立体化地层数据的实时传输变得尤为重要。针对目前传统传输方式的低速率、高成本及非实时性,提出了一种基于非连续正交频分复用调制的声波传输方式。首先,利用传输矩阵法对钻柱信道的幅频特性进行仿真,并在此基础上提出了信道估计算法以获取子信道的频率响应;然后,采用双加速度传感器阵列接收相移声波信号,通过接收信号的相关性可以有效的抑制上行传输中地面强噪声的干扰;最后设计了一套通信测试装置,对实验钻柱信道下系统传输性能进行验证。仿真及实测结果表明,该方案可以具有较高的传输速率和可靠性。With the rapid development of logging while drilling（ LWD） technology,the real-time transmission of multi-dimensional formation data is particularly important. Aiming at improving the low data rate,high cost,and non-real time for traditional transmission approaches,this paper proposes a novel acoustic transmission scheme based on non-continuous orthogonal frequency division multiplexing（ NC-OFDM）. Firstly,the frequency response function of drill strings channel is simulated through transfer matrix method（ TMM）,and on this basis,a channel estimation method is proposed to obtain frequency response of each sub-channel. Then,a received array with two accelerometers is utilized to receive the acoustic signals with phase shifting,and the surface strong noise interference of uplink transmission can be reduced through the correlation of the received signals. Finally,a set of test device of communication is designed to validate the transmission performance under the channel condition of experimental drill strings. Simulation and test results show that the designed transmission scheme has high data rate and high reliability.

关 键 词：随钻测井 非连续正交频分复用 传输矩阵法 信道估计 噪声干扰 

分 类 号：TH701[机械工程—仪器科学与技术]