Investigating GNSS PPP–RTK with external ionospheric constraints
نویسندگان
چکیده
Abstract Real-Time Kinematic Precise Point Positioning (PPP–RTK) is inextricably linked to external ionospheric information. The PPP–RTK performances vary much with the accuracy of information, which derived from different network scales, given prior variances, and obtained under disturbed conditions. This study investigates relationships between performances, in terms precision convergence time, statistical results show that Time First Fix (TTFF) for constrained by Global Ionosphere Map (PPP–RTK-GIM) about 8–10 min, improved 20%–50% as compared PPP Ambiguity Resolution (PPP-AR) whose TTFF 13–16 min. Additionally, 4.4 5.2 6.8 respectively, when information e.g. small-, medium-, large-scale networks, respectively. To analyze influences optimal variances delay on results, errors 0.5 Total Electron Content Unit (TECU), 1 TECU, 3 5 TECU are added initial delays, corresponding time less than 3, 5, 6 After adding errors, a small variance leads long larger same PPP-AR. Only an determined model, can be shorten greatly. impact Travelling Ionospheric Disturbance (TID) further studied simulation. It found TIDs increase corrections, thus affecting positioning accuracy, reliability PPP–RTK.
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ژورنال
عنوان ژورنال: Satellite Navigation
سال: 2022
ISSN: ['2662-1363', '2662-9291']
DOI: https://doi.org/10.1186/s43020-022-00067-1