UDRE estimation approach based on satellite surveillance dilution of precision
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摘要: 星基增强导航系统(SBAS, Satellite Based Augmentation System)通过向用户提供用户差分距离误差(UDRE, User Differential Range Error),来保证广播星历和星钟改正数的精度并增强用户的完好性性能.给出了一种用于主控站的UDRE计算方法,提出了卫星监视几何精度因子(SSDOP, Satellite Surveillance Dilution of Precision)的概念.基于UDRE和SSDOP的表达式,通过数学推导发现UDRE受到SSDOP和限制因子的影响,而限制因子可以用其统计平均值0.7438来替代,建立了由SSDOP估计UDRE的表达式.仿真结果表明:利用SSDOP估计出的UDRE值,其误差不超过0.8 m,能够反映出当前卫星UDRE的特性,可以作为用户在无法接收完好性信息时快速推算UDRE的一种可行手段.
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关键词:
- 星基增强导航系统 /
- 用户差分距离误差 /
- 卫星监视几何精度因子 /
- 限制因子
Abstract: Satellite based augmentation system (SBAS) provides user differential range error (UDRE) which guarantees satellite ephemeris and clock correction accuracies to the users to enhance their integrity. A method of calculating UDRE only used in the master station was introduced, then a concept of satellite surveillance dilution of precision (SSDOP) was proposed to reflect the effect of changing the reference stations- distribution on the satellite ephemeris and clock correction accuracies. A mathematical equation was deduced from the SSDOP and UDRE expressions, and from the view of the equation the UDRE was infected by SSDOP and restriction factor which could be replaced by, 0.7438, its statistic average value.The equation based upon SSDOP to estimate UDRE was established. The simulation results show that the estimation value of UDRE based on SSDOP can reflect the performance of the current UDRE and its accuracy is less than 0.8m. This approach can be used as an alternative method to calculate the UDRE when the user can-t receive the integrity information broadcasted by SBAS. -
[1] RTCA/DO-229D,Minimum operational performance standards for global positioning system/wide area augmentation system airborne equipment [S].2006:3-6 [2] Yeou-Jyh Tsai.Wide area differential operation of the global positioning system: ephemeris and clock algorithms .California: Department of Mechanical Engineering,Stanford University,1999 [3] Elliott D Kaplan,Christopher J Hegarty.Understanding GPS principles and applications[M].2nd ed.Norwood,MA: Artech House Inc,2006:322-327 [4] 钟慧敏,房建成.基于非线性模型预测滤波的微纳卫星定位方法[J].北京航空航天大学学报,2008,34(11):1339-1342 Zhong Huimin,Fang Jiancheng.Novel method of position determination for low earth orbiter micro-nano satellite based on nonlinear model predict filter [J].Journal of Beijing University of Aeronautics and Astronautics,2008,34(11):1139-1342 (in Chinese) [5] 马小辉.地面完好性通道(GIC)仿真技术研究 .北京:北京航空航天大学电子信息工程学院,2008 Ma Xiaohui.The research of the technique of simulation of ground integrity channel (GIC) .Beijing: School of Electronic and Information Engineering,Beijing University of Aeronautics and Astronautics,2008(in Chinese) [6] 谭述森.北斗卫星导航系统的发展与思考[J].宇航学报,2008,29(2):391-396 Tan Shusen.Development and thought of compass navigation satellite system [J].Journal of Astronautics,2008,29(2):391-396 (in Chinese)
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