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星基增强系统L1频段信息服务性能分析
赵镇1, 陈刚2,3, 胡志刚4
1.天津市测绘院, 天津 300381;2.中国地质大学(武汉), 海洋学院, 武汉 430074;3.中国地质大学(武汉)地质探测与评估教育部重点实验室, 武汉 430074;4.武汉大学卫星导航定位技术研究中心, 武汉 430079
摘要:
在北斗全球导航服务进程中,北斗星基增强服务的建设是我国卫星导航事业自身建设和不断完善发展的内在需求,更是我国卫星导航系统标准化建设的必然要求。本文基于星基增强信息定位原理,研究并实现星基增强系统的标准定位算法,采用IGS站点数据及增强信息电文,对WAAS与EGNOS系统服务性能进行分析评估,在“陆态网络”数据处理中,加入SBAS信息也可对相关误差进行改正。结果表明,加入播发的差分改正信息定位精度相对于伪距单点定位显著提高,平面方向统计均方根残差优于1m,高程方向优于1.2m;研究发现受地面参考站分布区域以及电离层、观测星座的影响,WAAS和EGNOS在定位服务性能覆盖范围内均表现出一定的区域性。从总体分析来看,不同系统空间段GEO卫星播发SBAS消息特性不一,均满足单频定位需求,EGNOS稳定性低于WAAS系统,播发消息时有中断现象,在实时单频定位性能方面,WAAS的服务性能较EGNOS得到更优的解算结果。
关键词:  WAAS  EGNOS  实时差分  区域评估  SBAS
DOI:
分类号:P315
基金项目:国家自然科学基金(41674015)资助
Service Performance Analysis on L1 Frequnency of Satellite-based Augmentation System
Zhao Zhen1, Chen Gang2,3, Hu Zhigang4
1.Tianjin Institute of Surveying and Mapping, Tianjin 300381, China;2.College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China;3.Key Laboratory of Geological Survey and Evaluation of Ministry of Education China, China University of Geosciences, Wuhan 430074, China;4.GNSS Research Center, Wuhan University, Wuhan 430079, China
Abstract:
In the BDS service process,the construction of Satellite-based augmentation system(SBAS)is the internal demand for the self-improvement and continuous improvement of China's satellite navigation industry,and it is also the inevitable requirement of the standardized construction of BDS. Based on the principle of SBAS positioning and related standards,we study and implement the standard positioning algorithm that supports the current SBAS messages. In this paper,service performance of WAAS and EGNOS systems is analyzed by IGS site data and SBAS messages. In the data processing of the Crustal Movement Observation Network of China,the relevant errors can also be corrected with SBAS messages. The results show that the accuracy of positioning by differential correction information is significantly improved relative to single point positioning,with the statistics of horizontal better than 1m,and the vertical statistics better than 1.2m. Both WAAS and EGNOS showed a certain regional feature in the coverage of service performance due to the the ionosphere and observation constellations and distribution area of ground reference stations. Overall,the SBAS message characteristic by different system space segment GEO satellite is inconsistent,which all meet the demand for single-frequency positioning. EGNOS constancy is lower than WAAS,which exists interruption phenomenon. In real-time single-frequency positioning performance,WAAS service performance is better than EGNOS on the computed results.
Key words:  WAAS  EGNOS  Real-time differential  Regional assessment  SBAS