摘要
在总结已有的RAIM可用性评估的矩阵最大特征值方法(MMEM)基础上,改进已有的双星故障条件下RAIM可用性方法中的数学模型,提出RAIM可用性评估的极大值方法(MM)。基于给定的完好性风险参数和国际GNSS监测评估系统(IGMAS)提供的2020-09-06中国境内8个跟踪站的BDS实测数据,利用2种方法计算双星故障条件下水平保护级别(HPL),比较并分析2种方法在双星故障条件下BDS的RAIM可用性性能。结果表明,在中国境内,MMEM除在非精密进近(NPA)计算的RAIM可用性不及MM外,整体可用性高于MM,但MM耗时较少;MM计算的可用性能够完全满足航路和远洋2个阶段,MMEM计算的可用性可以完全满足终端、航路和远洋3个阶段;基于MM的RAIM可用性评估方法理论严密、数学模型简单、易于进行程序设计,是除MMEM外的另一种RAIM可用性评估方法。
Based on summarizing the existing matrix maximum eigenvalue method(MMEM)of RAIM availability evaluation,we improve the mathematical model in the existing RAIM availability method under double-satellite faults conditions,and propose the maxima method(MM)of RAIM availability evaluation.Based on the given integrity risk parameters and the BDS measured data of 8 tracking stations in China provided by the international GNSS monitoring and assessment system(IGMAS)on September 6,2020,we use the two methods to calculate the horizontal protection level(HPL)under double-satellite faults conditions to compare and analyze the RAIM availability performance of BDS.The results show that the MMEM-based RAIM availability is lower than that of the MM in non-precision approach(NPA)in China,the overall MMEM-based RAIM availability is higher than that of MM,but the MM method consumes less calculation time.The MM-based RAIM availability can fully meet the route and ocean stages,and the MMEM-based RAIM availability can fully meet the terminal,route and ocean stages.The MM-based RAIM availability has rigorous theory,a simple mathematical model,and is easy to program.It is another RAIM availability evaluation method besides MMEM.
作者
马下平
余科根
贺小星
严丽
赵立都
MA Xiaping;YU Kegen;HE Xiaoxing;YAN Li;ZHAO Lidu(College of Geomatics,Xi’an University of Science and Technology,58 YantaRoad,Xi’an710054,China;School of Environment and Spatial Informatics,China University of Mining and Technology,1 DaxueRoad,Xuzhou 221116,China;School of Civil and Surveying and Mapping Engineering,Jiangxi University of Science and Technology,86 HongqiRoad,Ganzhou341000,China;Engineering Research Center for Seismic Disaster Prevention and Engineering Geological Disaster Detection of Jiangxi Province,418 Guanglan Road,Nanchang 330013,China;School of Civil Engineering,Chongqing Jiaotong University,66 XuefuRoad,Chongqing 400074,China)
出处
《大地测量与地球动力学》
CSCD
北大核心
2022年第9期931-937,共7页
Journal of Geodesy and Geodynamics
基金
国家重点研发计划(2016YFB0502102)
国家自然科学基金(41904171,42104023)
上海市空间导航与定位技术重点实验室开放课题(201913)
江西理工大学高层次人才科研启动项目(205200100564)
江西省防震减灾与工程地质灾害探测工程研究中心开放基金(SDGD202109)。
