基于北斗五频超宽巷组合的单历元定位方法  

Single epoch positioning method based on BDS five-frequency extra-wide-lane combination

作　　者：高旺 张泽宇 潘树国[1] 王澄非[1] GAO Wang;ZHANG Zeyu;PAN Shuguo;WANG Chengfei(School of Instrument Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学仪器科学与工程学院,南京210096

出　　处：《中国惯性技术学报》2023年第9期918-924,931,共8页Journal of Chinese Inertial Technology

基　　金：国家电网公司科技项目:电力北斗高精度定位优化技术研究(5700-202218439A-2-0-ZN)。

摘　　要：针对通信能力受限的长基线场景,提出了一种北斗五频弱电离层超宽巷定位方法,并给出了对应的减少带宽占用的参考编码模式。通过分析整系数线性组合对波长、大气延迟及测量噪声的影响,确定了选取最优组合的约束条件,并搜索得到BDS-3的长基线单历元定位最优超宽巷组合(0,1,3,-1,-3);在此基础上进一步利用弱电离层窄巷组合噪声因子小的特点,提出了利用窄巷观测量平滑超宽巷观测量噪声的多历元平滑定位方法。结合上述定位方法,给出了一种减少编码带宽的差分播发策略。利用三条不同长度基线开展了实验,结果表明弱电离层超宽巷组合单历元定位精度平面优于0.25 m、高程优于0.45 m,模糊度固定率高于98.5%;平滑后的定位精度平面优于0.1 m、高程优于0.25 m,实现三维定位精度优于0.15 m所需的收敛时间均值小于5 min。A Beidou navigation satellite system(BDS)five-frequency ionospheric-reduced extra-wide-lane positioning method is proposed for the scenario of sparse number of long-baseline reference stations and limited communication capability,and the corresponding reference coding mode to reduce bandwidth occupancy is given.By analyzing the effects of the linear combination of integral coefficients on wavelength,atmospheric delay and measurement noise,the constraints of selecting the optimal combination are determined,and the optimal ultra-wide-lane combination(0,1,3,-1,-3)for long baseline single epoch positioning of BDS-3 is searched.On this basis,combined with the feature of little noise factor of the ionospheric-reduced narrow-lane combination,a multi-epoch smoothing method using narrow-lane observations to smooth the noise of extra-wide-lane observations is further proposed.Adapted to the above positioning method,a small data volume differential broadcast coding strategy is proposed.Experiments are carried out using three different length baselines,and the results show that the positioning accuracy of the combined single-epoch of the ionospheric-reduced extra-wide-lane is better than 0.25 m in plane and 0.45 m in elevation,and the ambiguity fixation rate is higher than 98.5%.After smoothing,the positioning accuracy is better than 0.1 m in plane and 0.25 m in elevation,and the average convergence time is less than 5 min to achieve 3D positioning accuracy better than 0.15 m.

关 键 词：北斗卫星导航系统 五频 超宽巷 编码策略 单历元定位 

分 类 号：P228.1[天文地球—大地测量学与测量工程]