US 12,461,252 B2
ARAIM availability prediction method under complex terrain environment
Yanbo Zhu, Beijing (CN); Zhipeng Wang, Beijing (CN); Kun Fang, Beijing (CN); Jingtian Du, Beijing (CN); and Hongxia Wang, Beijing (CN)
Filed by Beihang University, Beijing (CN)
Filed on Apr. 24, 2023, as Appl. No. 18/138,156.
Claims priority of application No. 202211548576.2 (CN), filed on Dec. 5, 2022.
Prior Publication US 2024/0183998 A1, Jun. 6, 2024
Int. Cl. G01S 19/40 (2010.01)
CPC G01S 19/40 (2013.01) 10 Claims
OG exemplary drawing
 
1. An advanced receiver autonomous integrity monitor (ARAIM) availability prediction method under a complex terrain environment performed by a processor, comprising the steps of:
1) selecting a positioning point according to an air line of an aircraft under operation;
2) calculating terrain shielding angles;
3) predicting visible satellites;
4) determining a fault mode, wherein the fault mode needs to be monitored;
5) calculating a positioning error variance, an influence coefficient of a nominal deviation, and a variance of a solution separation test statistic;
6) calculating a threshold of a solution separation test, calculating a protection level, and determining an availability; and
7) sending safety warnings to the aircraft based on the determined availability.