最小均方信道均衡的UWB测距方法研究  

Research on UWB ranging method of least mean square channel equalization

作　　者：崔学荣[1] 周靖超 李娟[2] 李世宝[1] CUI Xuerong;ZHOU Jingchao;LI Juan;LI Shibao(College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao,Shandong 266580,China;College of Computer Science and Technology,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [2]中国石油大学(华东)计算机科学与技术学院,山东青岛266580

出　　处：《导航定位学报》2021年第5期66-72,81,共8页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(61671482,61902431);中央高校基本科研业务费专项基金(17CX02042A,19CX05003A-9,18CX02136A);山东省重点研发项目(2019GGX101048);潍坊市科技计划项目(2019ZJ1063)。

摘　　要：针对超宽带(UWB)信号在室内复杂环境下,易受多径及噪声等因素的干扰,造成接收端波形发生畸变,相关接收机相关峰峰值对应的时延值存在偏差,进而影响信号到达时间估计(TOA)算法测距精度的问题,提出了一种在相关接收前的基于最小均方(LMS)算法的信道均衡技术,使用LMS均衡器对UWB接收信号进行处理,以减少多径和噪声对信号的干扰,恢复原始发送信号,实现在复杂环境下相关接收机进行准确的相关接收,获得高精度的时间测量值,提高TOA测距算法的测距精度。实验结果显示,采用LMS信道均衡技术后的TOA测距精度能够达到厘米级,相比于仅采用相关接收的测距精度至少提高了50.8%,能够获得更高、更稳定的测距精度,满足高精度定位的需求。In view of the problem that Ultra Wide Band(UWB)signals are susceptible to interference from factors such as multipath and noise in the indoor complex environment,the waveform at the receiving end is distorted,and the delay value corresponding to the relevant peak-to-peak value of the relevant receiver is deviated,thereby negatively affecting the ranging accuracy of the signal Time of Arrival(TOA)estimation algorithm,this paper proposes a channel equalization technology based on Least Mean Square(LMS)algorithm before correlation reception.Use LMS equalizer to process the UWB received signal and reduce the interference of multipath and noise on the signal.Restore the original transmitted signal,and realize the accurate correlation reception of the relevant receiver in the complex environment,obtain high-precision time measurement value,and improve the ranging accuracy of TOA ranging algorithm.The experimental results show that the TOA ranging accuracy after using the LMS channel equalization technology can reach the centimeter level,which is at least 50.8%higher than the ranging accuracy using only the relevant reception,and can obtain higher and more stable ranging accuracy.The need for high-precision positioning is also met.

关 键 词：超宽带 多径传播 相关接收 到达时间估计 最小均方算法 信道均衡 

分 类 号：P228[天文地球—大地测量学与测量工程]