GBAS可用性预测是在地基增强系统(Ground Based Augmentation System,GBAS)的整个进近引导过程中,对GBAS服务状态及卫星星座状态的一种预测,并辅助塔台监控人员监视,是民航GBAS应用的重要监测措施。为保证GBAS机载用户在终端区精密进近...GBAS可用性预测是在地基增强系统(Ground Based Augmentation System,GBAS)的整个进近引导过程中,对GBAS服务状态及卫星星座状态的一种预测,并辅助塔台监控人员监视,是民航GBAS应用的重要监测措施。为保证GBAS机载用户在终端区精密进近引导着陆的可靠性及安全性,提出一种基于GBAS地面基准位置的可用性预测方法,该方法通过星历或历书、卫星信号的相关峰、GBAS报文信息等内容预测未来卫星星座的状态,进而完成对GBAS服务状态的预测,以便系统及时向塔台监控人员发出预测告警、调整GBAS进近程序,进而达到可用性监视的目的,提高了系统的完好性及可用性。展开更多
The effect of ionospheric delay on the ground-based augmentation system under normal conditions can be mitigated by determining the value of the nominal ionospheric gradient(σvig).The nominal ionospheric gradient is ...The effect of ionospheric delay on the ground-based augmentation system under normal conditions can be mitigated by determining the value of the nominal ionospheric gradient(σvig).The nominal ionospheric gradient is generally obtained from Continuously Operating Reference Stations data by using the spatial single-difference method(mixed-pair,station-pair,or satellite-pair)or the temporal single-difference method(time-step).The time-step method uses only a single receiver,but it still contains ionospheric temporal variations.We introduce a corrected time-step method using a fixed-ionospheric pierce point from the geostationary equatorial orbit satellite and test it through simulations based on the global ionospheric model.We also investigate the effect of satellite paths on the corrected time-step method in the region of the equator,which tends to be in a more north–south direction and to have less coverage for the east–west ionospheric gradient.This study also addresses the limitations of temporal variation correction coverage and recommends using only the correction from self-observations.All processes are developed under simulations because observational data are still difficult to obtain.Our findings demonstrate that the corrected time-step method yieldsσvig values consistent with other approaches.展开更多
文摘GBAS可用性预测是在地基增强系统(Ground Based Augmentation System,GBAS)的整个进近引导过程中,对GBAS服务状态及卫星星座状态的一种预测,并辅助塔台监控人员监视,是民航GBAS应用的重要监测措施。为保证GBAS机载用户在终端区精密进近引导着陆的可靠性及安全性,提出一种基于GBAS地面基准位置的可用性预测方法,该方法通过星历或历书、卫星信号的相关峰、GBAS报文信息等内容预测未来卫星星座的状态,进而完成对GBAS服务状态的预测,以便系统及时向塔台监控人员发出预测告警、调整GBAS进近程序,进而达到可用性监视的目的,提高了系统的完好性及可用性。
基金funding from BRIN through the Research Collaboration Program with ORPA(No.2/III.1/HK/2024)Prayitno Abadi is participating in this study as part of a Memorandum of Understanding for Research Collaboration on Regional Ionospheric Observation at Telkom University(No.092/SAM3/TE-DEK/2021).
文摘The effect of ionospheric delay on the ground-based augmentation system under normal conditions can be mitigated by determining the value of the nominal ionospheric gradient(σvig).The nominal ionospheric gradient is generally obtained from Continuously Operating Reference Stations data by using the spatial single-difference method(mixed-pair,station-pair,or satellite-pair)or the temporal single-difference method(time-step).The time-step method uses only a single receiver,but it still contains ionospheric temporal variations.We introduce a corrected time-step method using a fixed-ionospheric pierce point from the geostationary equatorial orbit satellite and test it through simulations based on the global ionospheric model.We also investigate the effect of satellite paths on the corrected time-step method in the region of the equator,which tends to be in a more north–south direction and to have less coverage for the east–west ionospheric gradient.This study also addresses the limitations of temporal variation correction coverage and recommends using only the correction from self-observations.All processes are developed under simulations because observational data are still difficult to obtain.Our findings demonstrate that the corrected time-step method yieldsσvig values consistent with other approaches.
