An Extremum Approximation ARAIM Algorithm Based on GPS and BDS

Xiyan Sun,Wentao Fu,Linzhu Xu,Qidong Chen,Yuanfa Ji,Suqing Yan

doi:10.1109/access.2020.2972766

Abstract

Advanced receiver autonomous integrity monitoring (ARAIM) is a new technology that can reduce the vertical protection level (VPL) by optimizing the probability of configuration information to improve availability. Compared with traditional receiver autonomous integrity monitoring (RAIM), the powerful vertical guidance capability of ARAIM highlights its advantages. This paper improves ARAIM performance by reducing the difference between the two most important view solutions affecting the VPL and the all-in-view solution while satisfying the accuracy. First, this paper proposes new constellation configurations suitable for GPS/BDS, which is a nontraditional constellation itself; second, this paper proposes a method called EA-ARAIM for improving ARAIM performance. The results show that for the depleted constellation in the case of visible satellite reduction, the coverage can increase from 59.97% to 76.63% with the assistance of EA-ARAIM. Even for the optimistic constellation, where there is not much room to improve availability, the improved algorithm can increase the coverage to approximately 3%. Finally, compared with the simulation data used in most of the literature, this paper uses real data obtained from MGEX for analysis.

Highlights

Due to the increase in the Global Navigation Satellite System (GNSS) constellation, GPS, and BDS, GALILEO and GLONASS are playing increasingly greater roles in global navigation services
Compared with the traditional GPS/GALILEO constellation used for the evaluation of the performance of Advanced receiver autonomous integrity monitoring (ARAIM), this paper proposes a method based on GPS/BDS for the evaluation of the performance of ARAIM in the Asia Pacific region
In addition,the improved algorithm proposed in this paper aims to find the best advantage between the optimal vertical protection level (VPL) and the accurate value to improve a situation in which the VPL, due to many factors, exceeds the threshold value

Summary

Introduction

Due to the increase in the Global Navigation Satellite System (GNSS) constellation, GPS, and BDS, GALILEO and GLONASS are playing increasingly greater roles in global navigation services. More constellations mean that more visible satellites can be used for positioning, which greatly improves geometry [1], [2]. In this way, the accuracy of positioning is obviously improved. In ARAIM, the combination of multifrequency and multiconstellation greatly improves global vertical guidance [4].

Objectives

Results

Conclusion