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公开(公告)号：US20230358895A1
公开(公告)日：2023-11-09
申请号：US17662536
申请日：2022-05-09
申请人： Raytheon Company
发明人： Shuwu Wu , Matt Keti , Andrew J. Thomas , Joseph Chang
CPC分类号： G01S19/20 , G01S19/396 , G01S19/393
摘要： A method for multi-track environmental fault monitoring for aerial platforms includes estimating a normalized squared residual error (NSRE) for each of one or more satellite-receiver tracks over time. The method also includes determining an averaged NSRE for each satellite-receiver track by averaging the NSRE over multiple time windows. The method further includes performing a threshold test on the averaged NSRE to determine a filter state. In addition, the method includes determining whether to apply a scale factor for each satellite-receiver track based on the filter state.
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2.发明公开公开(公告)号：US20230326356A1
公开(公告)日：2023-10-12
申请号：US17716876
申请日：2022-04-08
申请人： Raytheon Company
发明人： Shuwu Wu , Andrew J. Thomas , Joseph Chang
CPC分类号： G08G5/025 , G08G5/003 , G08G5/0017 , G08G5/0091
摘要： A method includes repeatedly determining a distance of an aircraft from a landing location. The method also includes, during a first stage in which the aircraft is at least a threshold distance from the landing location, performing iono-free processing during navigation of the aircraft. The method further includes, during a second stage in which the aircraft is less than the threshold distance from the landing location and a velocity of the aircraft is greater than a velocity threshold, performing divergence-free processing during navigation of the aircraft to address possible ionospheric threats. In addition, the method includes, during a third stage in which the aircraft is less than the threshold distance from the landing location and the velocity of the aircraft is less than the velocity threshold, calculating one or more floor values for a Differential Ionospheric Correction (DIC) sigma, and determining a navigation solution to protect against nominal ionospheric conditions.
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3.发明授权公开(公告)号：US12020584B2
公开(公告)日：2024-06-25
申请号：US17716876
申请日：2022-04-08
申请人： Raytheon Company
发明人： Shuwu Wu , Andrew J. Thomas , Joseph Chang
CPC分类号： G08G5/025 , G08G5/0017 , G08G5/003 , G08G5/0091
摘要： A method includes repeatedly determining a distance of an aircraft from a landing location. The method also includes, during a first stage in which the aircraft is at least a threshold distance from the landing location, performing iono-free processing during navigation of the aircraft. The method further includes, during a second stage in which the aircraft is less than the threshold distance from the landing location and a velocity of the aircraft is greater than a velocity threshold, performing divergence-free processing during navigation of the aircraft to address possible ionospheric threats. In addition, the method includes, during a third stage in which the aircraft is less than the threshold distance from the landing location and the velocity of the aircraft is less than the velocity threshold, calculating one or more floor values for a Differential Ionospheric Correction (DIC) sigma, and determining a navigation solution to protect against nominal ionospheric conditions.
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