基于GNSS的空间环境参数反演平台及精度评估  

Platform for GNSS real-time space environment parameter inversion and its accuracy evaluation

作　　者：赵乐文 任嘉倩 丁杨 ZHAO Lewen;REN Jiaqian;DING Yang(School of Remote Sensing&Geomatics Engineering,Nanjing University of Information Science&Technology,Nanjing 210044)

机构地区：[1]南京信息工程大学遥感与测绘工程学院,南京210044

出　　处：《南京信息工程大学学报（自然科学版）》2021年第2期204-210,共7页Journal of Nanjing University of Information Science & Technology（Natural Science Edition）

基　　金：南京信息工程大学人才启动经费项目(2019r081);江苏省高校自然科学研究面上项目(20KJB170008)。

摘　　要：基于全球和区域全球导航卫星系统(GNSS)参考站网进行对流层和电离层参数反演实现空间环境变化监测具有成本低、精度高、实时性好等优点,得到了广泛应用.本文基于南京信息工程大学的北斗/GNSS空间环境监测平台Xsens-ing,以国际GNSS服务组织提供的对流层产品为参考,评估了不同气象条件下对流层参数反演精度,在此基础上采用固定非差模糊度的精密单点定位技术(PPP)实现高精度电离层参数反演.实验结果表明,基于全球参考站的对流层估计误差偏差为0.05 mm,对应的标准差为5.6 mm,在平稳和剧烈的气象条件下均能反映水汽变化趋势特征.基于短基线进行电离层延迟反演精度评估,结果表明浮点解PPP反演电离层延迟误差的平均偏差为-0.09 TECU,精度为0.38 TECU,采用非差模糊度固定技术对电离层延迟提取精度提高达84.2%;静态模拟动态解算模式下电离层估计精度与静态相当.上述结果表明该平台可实现高精度空间环境参数反演,下一步将融合机载、船载等多种平台观测实现中小尺度空间变化监测.The retrieval of tropospheric and ionospheric parameters from global and regional Global Navigation Sat-ellite System(GNSS)reference station networks has the benefits of low cost,high precision and real-time.The GNSS space environmental monitoring platform of Xsensing proposed by Nanjing University of Information Science and Technology is introduced in this paper.Firstly,the accuracy of tropospheric parameter inversion under different meteorological conditions is evaluated with the tropospheric products provided by the international GNSS service as a reference.Then,the ambiguity-fixed Precise Point Positioning(PPP)method is used to realize high-precision iono-spheric parameter inversion.The experimental results show that the mean bias of the tropospheric delay errors is 0.05 mm,and the corresponding standard deviation is 5.6 mm.The results can reflect the trend of water vapor chan-ges with high accuracy under stable or severe weather conditions.The accuracy of ionospheric inversion is evaluated based on a short baseline test.The mean bias of ionospheric delay errors from the ambiguity-float PPP is-0.09 TECU,and the accuracy is 0.38 TECU.The ambiguity fixed PPP method can improve the accuracy by 84.2%.Be-sides,comparable accuracy can be achieved using the static and simulated kinematic PPP.The results verify the ini-tial accuracy of the Xsensing platform and pave the way for improving the spatial and temporal resolution of the space environment monitoring using airborne and shipborne platforms.

关 键 词：全球导航卫星系统 精密单点定位技术 对流层 电离层 反演 Xsensing平台 

分 类 号：P228.4[天文地球—大地测量学与测量工程]