Acta Geodaetica et Cartographica Sinica ›› 2021, Vol. 50 ›› Issue (12): 1751-1761.doi: 10.11947/j.AGCS.2021.20200260

• Navigation Satellite System • Previous Articles     Next Articles

Optimal allocation of risk probability based on ARAIM algorithm

HAN Qingqing1,2, WANG Li1,3,4, LUO Silong1,5, SHU Bao1,3,4, YUE Cong1,6   

  1. 1. College of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054 China;
    2. College of Surveying and Mapping Engineering, Yellow River Conservancy Technical Institute, Kaifeng 475004, China;
    3. State Key Laboratory of Geographic Information Engineering, Xi'an 710054, China;
    4. Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of Education, Xi'an 710054, China;
    5. School of Geosciences and Info-physics, Central South University, Changsha 410083, China;
    6. The First Geodetic Survey Brigade of MNR, Xi'an 710054, China
  • Received:2020-06-24 Revised:2021-08-24 Published:2022-01-08
  • Supported by:
    The National Natural Science Foundation of China (Nos. 41877289;41731066;41604001);The National Key Research and Development Program of China (Nos. 2018YFC1504805;2018YFC1505102);The State Key Laboratory of Geo-information Engineering (No. SKLGIE2017-Z-2-1)

Abstract: The advanced receiver autonomous integrity monitoring (ARAIM) algorithm distributes the probability of continuity risk and integrity risk equally to all visible satellites, resulting in the relatively conservative vertical protection level (VPL). Therefore, a maximum minimization method was adopted, and fminimax function of Matlab was used to reasonably allocate the intact risk and the continuity risk, improving the availability of single constellation ARAIM. The results of the calculation examples of the measured data show that: whether it is static or dynamic data, the maximum minimization method can reasonably allocate the risk. The average improvement rate of VPL for GPS and BDS single systems is 12.14% and 10.63%, respectively, and the average improvement rate of STD (standard deviation) is 78.69% and 72.33%, respectively. Compared with other two optimization algorithms, the optimization algorithm has a better effect of improving the availability of ARAIM under LPV-200. Global simulation results show that after using the maximum minimization method, GPS ARAIM availability is greater than 90% and 99.5% coverage has increased from 26.60% and 0% to 38.69% and 17.35%, respectively. BDS ARAIM availability is greater than 90%. The coverage of 99.5% has increased from 30.73% and 19.91% to 34.28% and 22.33%, respectively.

Key words: ARAIM, LPV-200, continuity risk, integrity risk, risk probability allocation

CLC Number: