Assessment of corrected time-step method for nominal ionospheric gradient calculation: A comparative analysis with spatial approaches  

作　　者：Slamet Supriadi Prayitno Abadi Susumu Saito Harry Bangkit Dwiko Unggul Prabowo Adi Purwono Ginaldi Ari Nugroho 

机构地区：[1]Research Center for Smart Mechatronics,National Research and Innovation Agency(BRIN),Bandung,Indonesia [2]Research Center for Climate and Atmosphere,BRIN,Bandung,Indonesia [3]School of Electrical Engineering,Telkom University,Kab.Bandung,Indonesia [4]Electronic Navigation Research Institute,National Institute of Maritime,Port and Aviation Technology,Tokyo,Japan [5]Research Center for Space,BRIN,Bandung,Indonesia

出　　处：《Earth and Planetary Physics》2024年第4期641-649,共9页地球与行星物理（英文版）

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).

摘　　要：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.

关 键 词：ground-based augmentation system nominal ionospheric gradient time-step correction global ionospheric model 

分 类 号：P352[天文地球—空间物理学]