Evaluation of Ionospheric Delay Effects on Multi-GNSS Positioning Performance
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TL;DR: The experimental results show that for single-frequency SPP, the Global Ionosphere Maps (GIMs) correction achieves the best accuracy, and the accuracy of the Neustrelitz TEC model (NTCM) solution is better than that of the broadcast ionospheric model (BIM) in the E and U components.
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Abstract: Ionospheric delay is a significant error source in multi-GNSS positioning. We present different processing strategies to fully exploit the ionospheric delay effects on multi-frequency and multi-GNSS positioning performance, including standard point positioning (SPP) and precise point positioning (PPP) scenarios. Datasets collected from 10 stations over thirty consecutive days provided by multi-GNSS experiment (MGEX) stations were used for single-frequency SPP/PPP and dual-frequency PPP tests with quad-constellation signals. The experimental results show that for single-frequency SPP, the Global Ionosphere Maps (GIMs) correction achieves the best accuracy, and the accuracy of the Neustrelitz TEC model (NTCM) solution is better than that of the broadcast ionospheric model (BIM) in the E and U components. Eliminating ionospheric parameters by observation combination is equivalent to estimating the parameters in PPP. Compared with the single-frequency uncombined (UC) approach, the average convergence time of PPP with the external ionospheric models is reduced. The improvement in BIM-, NTCM- and GIM-constrained quad-constellation L2 single-frequency PPP was 15.2%, 24.8% and 28.6%, respectively. The improvement in convergence time of dual-frequency PPP with ionospheric models was different for different constellations and the GLONASS-only solution showed the least improvement. The improvement in the convergence time of BIM-, NTCM- and GIM-constrained quad-constellation L1/L2 dual-frequency PPP was 5.2%, 6.2% and 8.5%, respectively, compared with the UC solution. The positioning accuracy of PPP is slightly better with the ionosphere constraint and the performance of the GIM-constrained PPP is the best. The combination of multi-GNSS can effectively improve the positioning performance.
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Citations
Evaluation of the Effect of Higher-Order Ionospheric Delay on GPS Precise Point Positioning Time Transfer
TL;DR: This study quantitatively analyzes the errors caused by higher-order ionospheric (Ion2+) delays in precise PPP time transfer and concludes that the Ion2+ correction is necessary for high-precision P PP time transfer over long time-links, especially time- links made by one station located in the northern hemisphere and another location in the south hemisphere.
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A new method to determine the optimal thin layer ionospheric height and its application in the polar regions
Hu Jiang,Shuanggen Jin,Manuel Hernández-Pajares,Hui Xi,Jiachun An,Zemin Wang,Xueyong Xu,Houxuan Yan +7 more
TL;DR: In this paper, a new method for determining the optimal TLIH is proposed, which compares the mapping function values (MFVs) from the MF at different given given thin-layer ionospheric height (TLIHs) with the truth mapping values from the UQRG global ionosphere maps (GIMs) and the differential TEC (dSTEC) method.
Real-Time Monitoring of Ionospheric Irregularities and TEC Perturbations
Giorgio Savastano,Michela Ravanelli +1 more
- 11 Dec 2019
TL;DR: In this paper, the authors describe the Variometric Approach for Real-Time Ionosphere Observation (VARION) algorithm, which is capable of estimating TEC variations in real time, and it was used to detect tsunami-induced TIDs.
Ionosphere Tomographic Model Based on Neural Network with Balance Cost and Dynamic Correction Using Multi-Constraints
TL;DR: In this article , the authors proposed an NN-based tomographic model with a balance cost function and a dynamic correction process (BCDC) for ionosphere inversion, which is composed of two balance terms corresponding to the measurements and the selected constraints, respectively.
Analysis of dual-frequency solution method for single-frequency precise point positioning based on SEID model for GPS and BDS
TL;DR: In this article, the impact of the SEID model on single-frequency (SF) and dual-frequency point positioning (PPP) was explored, and the GPS, BDS, and GPS-BDS dual-system observations in the networks were utilized to test positioning results, tropospheric delay and impact of satellite-induced code bias variations existing in BDS.
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