复杂多径下IR-UWB自适应频偏估计算法研究  

Research on Adaptive Clock Frequency Offset Estimation Method for IR-UWB under Complex Multipath

作　　者：田润泽 蔚保国[1,2] 鲍亚川 赵军 李建佳[1,2] 杨梦焕 TIAN Runze;YU Baoguo;BAO Yachuan;ZHAO Jun;LI Jianjia;YANG Menghuan(The 54th Research Institute,China Electronics Technology Group Corporation,Shijiazhuang 050081,China;State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第54研究所,石家庄050081 [2]卫星导航系统与装备技术国家重点实验室,石家庄050081

出　　处：《计算机测量与控制》2024年第2期227-233,243,共8页Computer Measurement &Control

基　　金：国家重点研发计划项目(2021YFB3900800);河北省省级科技计划(20310901D)。

摘　　要：在脉冲超宽带定位系统中,时钟频率偏移是影响测距和测角精度的重要因素;针对复杂多径下频偏估计精度低的问题,设计了一种适应复杂多径环境的脉冲超宽带自适应频偏估计算法;首先,借助脉冲超宽带信号的抗多径优势,将实时估计的信道脉冲响应作为自适应匹配滤波模板,以保证复杂多径下相关峰的准确提取;利用相关峰辐角信息得到前导符号的相位序列;再使用贝叶斯估计算法提高频偏估计精度;在IEEE 802.15.4a标准CM1、CM2多径信道下进行仿真,仿真结果表明,低信噪比情况下,频偏估计精度保证在0.2 ppm以内;在巷道环境实验结果表明,50 m范围内频偏估计标准差在0.06 ppm以内;实现了复杂多径环境下高精度频偏估计,具有较强的实用性。In impulse radio-ultra wideband(IR-UWB)positioning system,clock frequency offset is an important factor affecting the accuracy of ranging and angular measurement.Aiming at the low accuracy of frequency offset estimation under complex multipath,an IR-UWB adaptive frequency offset estimation algorithm for the complex multipath environment is designed.Firstly,with the advantage of anti-multipath of pulsed ultra-wideband signals,the real-time estimated channel impulse response as an adaptive matched filtering template is used to ensure the correct extraction of correlation peaks under complex multipath.Then,the phase sequence of the leading symbols is obtained using the associated peak spoke angle information.Finally,Bayesian estimation algorithm is used to improve the accuracy of frequency offset estimation.The simulations were performed under the CM1~CM2 multipath channels in IEEE 802.15.4a standard.The simulation results show that the accuracy of frequency offset estimation can be guaranteed within 0.2 ppm under low SNR.The experimental results in tunnel environment show that the standard deviation of frequency offset estimation is less than 0.06 ppm within the range of 50 m,which achieves the high precision estimation of frequency offset in complex multipath environments.It has a strong practicability in complex multi-path environment.

关 键 词：脉冲超宽带 复杂多径环境 频偏估计 匹配滤波 贝叶斯估计 

分 类 号：TN925[电子电信—通信与信息系统]