一种直接估计大气延迟的网络RTK算法研究  

Research on Algorithm of Network-RTK Based on Direct Estimation of Atmospheric Delay

作　　者：陈星宇 袁运斌 CHEN Xingyu;YUAN Yunbin(Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院精密测量科学与技术创新研究院,湖北武汉430071 [2]中国科学院大学,北京100049

出　　处：《数据与计算发展前沿》2022年第4期45-54,共10页Frontiers of Data & Computing

基　　金：国家重点研发计划“协同精密定位技术项目”(2016YFB0501900);王宽诚率先人才计划“卢嘉锡国际团队项目”。

摘　　要：【目的】网络RTK(Real Time Kinematic)技术仍是目前实现实时动态高精度定位的重要手段之一,其顺利实施的关键在于正确固定参考站间整周模糊度及解算空间相关误差。【方法】本文重点对基线间大气延迟提取方法进行研究:选择利用卡尔曼滤波器直接估计参考站网络内各基线间单差模糊度、单差电离层延迟、非差对流层延迟的数据处理策略,旨在减小通过几何无关组合反算大气延迟时引入的噪声和其他残余误差的影响,为网络RTK空间误差建模研究提供了新的单差数据形式。【结果】利用实时流数据验证了上述模糊度固定及大气延迟提取算法的正确性,对比了不同电离层延迟提取策略,进行了用户定位测试。【结论】结果表明:采用直接估计大气延迟的方法提取的电离层延迟的变化相对更平稳、更符合电离层延迟短时变化特性且计算效果受卫星高度角的影响很小,用户可快速实现实时厘米级定位,具有较好的适用性。[Objective]Network-RTK is still one of the most important approaches to achieving real-time dynamic high precision positioning.The key to the technology lies in correctly fixing the integer ambiguity between reference stations and solving spatial correlation errors.[Methods]The direct estimation of atmospheric delay method(DEADM)was used in this paper:Kalman filter is chosen to directly estimate single difference ambiguity,single difference ionospheric delay,and tropospheric delay data,aiming at reducing the influence of noise and other residual errors when calculating atmospheric delay by geometry-free combination.[Results]Real-time stream data were used to verify the correctness of the above algorithm and different ionospheric delay extraction strategies were compared.[Conclusions]The results show that the variation of ionospheric delay extracted by using the direct estimation of atmospheric delay method is relatively more stable,more consistent with the short-term variation characteristics of ionospheric delay,and the calculation effect is little affected by satellite elevation.Users can quickly realize real-time centimeter-level positioning with good applicability.

关 键 词：实时 网络RTK 整周模糊度 电离层延迟 对流层延迟 

分 类 号：P228.4[天文地球—大地测量学与测量工程]