| 一种使用抗差估计的保护水平重构方法 |
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| 引用本文： | 赵昂,杨元喜,许扬胤,景一帆,马越原.一种使用抗差估计的保护水平重构方法[J].武汉大学学报(信息科学版),2021(1). |
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| 作者姓名： | 赵昂 杨元喜 许扬胤 景一帆 马越原 |
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| 作者单位： | 西安测绘总站;地理空间信息工程国家重点实验室;信息工程大学地理空间信息学院 |
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| 基金项目： | 国家重点研发计划(2016YFB0501700,2016YFB0501701);国家自然科学基金(41874016,41474015,42074006);国家自然科学基金青年基金(41604013)。 |
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| 摘 要： | 北斗全球卫星导航系统(简称北斗三号系统,BDS-3)的建设对拓展全球卫星导航系统(global navigation satellite system, GNSS)的应用有重要作用,为多星座融合定位、导航和授时提供了重要支持。多系统融合定位给用户提供了更多的导航信息源,也为导航卫星系统完好性和用户自主完好性指标的实现提供了新的保障。然而多卫星组合的使用显著增加了观测冗余信息,由此提出一种基于抗差估计的保护水平重构方法,利用抗差估计方法及其参数验后信息,重新估计用户保护水平。利用GPS/BDS组合数据进行计算分析,实验结果表明,该方法可在保障特定要求定位精度的前提下,降低告警频率。
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| 关 键 词： | 抗差估计 保护水平 接收机自主完好性监测 故障检测与排除 |
A Method of Protection Level Reconstruction Based on Robust Estimation |
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| ZHAO Ang,YANG Yuanxi,XU Yangyin,JING Yifan,MA Yueyuan.A Method of Protection Level Reconstruction Based on Robust Estimation[J].Geomatics and Information Science of Wuhan University,2021(1). |
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| Authors: | ZHAO Ang YANG Yuanxi XU Yangyin JING Yifan MA Yueyuan |
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| Institution: | (Division of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Institute of Geographical Spatial Information,Information Engineering University,Zhengzhou 450001,China) |
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| Abstract: | The basic construction of BeiDou global satellite navigation system(BDS) has played a key role in promoting the development of global navigation satellite system,which provides an important guarantee for multi-constellation fusion positioning,navigation and timing.Multi-system fusion positioning provides users with more navigation information,and also provides a better guarantee for the realization of navigation performance indicators.At present,in order to ensure integrity,it is necessary to warn users when navigation service is unavailable.Due to satellite failure,the protection level exceeds its alert limit.However,under the condition of multi-frequency and multi-constellation,the number of satellites is sufficient.After a few satellite faults are eliminated quickly,the influence on the overall navigation accuracy is very small and no alarm is needed.A protection level reconstruction method based on robust estimation is proposed.The protection level is reconstructed by using robust information and posterior variance.In order to verify the feasibility of the algorithm,the accuracy and protection limits required by localizer performance with vertical guidance 200 ft(LPV-200) approach phase are selected as the standard of this paper,and the global positioning system(GPS)/BDS combination of dynamic and static data are used for calculation and analysis.The GPS adopts L1 pseudo range observation,and the BDS adopts B1 pseudo range observation.Each group of experiments is divided into two parts,fault detection and elimination and the method of adding abnormal error is calculated respectively,the vertical protection level is calculated by the protection level calculation method based on a posteriori variance and the protection level reconstruction method based on robust estimation.The results show that our proposed method can reduce the alarm frequency on the premise of ensuring the positioning accuracy. |
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| Keywords: | robust estimation protection level receiver autonomous integrity monitoring fault detection and exclusion |
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