电离层以及多径对载波相位平滑码伪距的误差分析  

Error Analysis of Ionospheric Gradients and Multipath on Single Frequency Smoothing Filter

作　　者：张昂 杨佳旭 曹有权 李斌[1] ZHANG Ang;YANG Jiaxu;CAO Youquan;LI Bin

机构地区：[1]中国电子科技集团公司第二十研究所,西安710068

出　　处：《现代导航》2022年第4期263-267,272,共6页Modern Navigation

摘　　要：当今业界主要采用载波平滑码伪距技术(Hatch滤波器)输出平滑伪距消除多径和热噪声等带来的影响,从而减少误差和改善定位精度。由于电离层对载波和伪距的测量值作用是相反的,那么采用载波平滑码伪距技术后输出的平滑伪距就会包含这些电离层时延引入的平滑误差,从而影响定位精度,甚至危及生命安全。因此,研究电离层对载波平滑码伪距的影响十分必要和重要。通过添加电离层时间梯度模型和多径模型,对平滑滤波器的输出误差进行理论分析,并对上述分析结果进行仿真验证,从而为选取电离层时间梯度监测门限值、选择合适滤波常数等场景提供理论基础。The industry mainly uses the technology of carrier smoothing pseudo-range to output smoothed pseudo-range,e.g.Hatch filter,which further reduces the influence of multipath and thermal noise,so as to improve the positioning accuracy.Since the ionosphere has opposite effects on the measured values of the carrier and the pseudo-range,the smoothed pseudo-range will contain the error introduced by the ionospheric delay,which will affect the positioning accuracy and even endanger the safety of life.Therefore,it is important and necessary to study the influence of ionosphere on carrier smooth pseudo-range.By adding the ionospheric time gradient model and multipath model,the output error of smoothing filter is analyzed theoretically,and the above analysis results are simulated and verified,so as to provide the theoretical basis under the scenarios of the ionospheric time gradient monitoring threshold selection,the appropriate filter time constant selection,etc.

关 键 词：电离层 时间梯度 多径 平滑滤波器 误差分析 

分 类 号：TN967[电子电信—信号与信息处理]