Satellite selection methods for multi-constellation advanced RAIM |
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Institution: | 1. State Key Laboratory of Geographic Information Engineering, Xi''an 710054, PR China;2. School of Geological Engineering and Geomatics, Chang''an University, Xi''an 710054, PR China;3. National Time Service Center, Chinese Academy of Sciences, Xi''an 710600, PR China;4. National Administration of Surveying, Mapping and Geo-information Engineering Research Center of Geographic National Conditions Monitoring, Xi''an 710054, PR China;5. University of Chinese Academy of Sciences, Beijing 100049, PR China |
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Abstract: | The increased number of potential threat modes under multi-constellation advanced receiver autonomy integrity monitoring (ARAIM) requires an increase in the number of subsets and a correspondingly high computational load. A new satellite selection method based on integrity support message (ISM) parameters is proposed and compared with GDOP-based selection. The performance was tested on five days of data measurements from 21 multi-global navigation satellite system experiment (MGEX) stations distributed around the world, as well as simulation using the broadcast ephemeris. The results show that the proposed ISM-based satellite selection method is highly compatible with the baseline ARAIM. This method could reduce the computational times by about 60–70% quickly, with minimising vertical protection level (VPL) loss, which was consistently within 1 m, even a reduced VPL value in some epochs, and resulting in an improved availability. The simulation results were similar to the MGEX data. It appears that the application of ISM-based satellite selection can effectively reduce computational burden with a minimal impact on availability. |
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Keywords: | Advanced RAIM Satellite selection Multi-GNSS ISM LPV-200 |
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