Assessment of the GNSS PPP performance using ultra-rapid and rapid products from different analysis centres

Öğütçü, Sermet; Farhan, Haitham Talib

doi:10.1080/00396265.2020.1860869

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Even though actual NRT processing schemes for LEO missions are likely to differ in the specific choice of start times and arc length, the above scheme is considered generally representative and suitable to highlight the performance achievable with sub-daily observation arcs and (near-) real-time GNSS orbit and clock data. To better assess the HAS-based POD quality, we also generate NRT solutions using the WUM0MGXULA ultra-rapid multi-GNSS orbit and clock products provided by the IGS analysis center of Wuhan University (Ma et al 2017;Ogutcu and Farhan 2022). The ultra-rapid products comprise 24 h of observed orbit and clock data followed by a 24 h prediction and are generated 24 times a day with one-hour latency after the end of the observed part.…”

Section: Near Real-time Podmentioning

confidence: 99%

Orbit determination of Sentinel-6A using the Galileo high accuracy service test signal

et al. 2022

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The High Accuracy Service (HAS) is an upcoming addition to the Galileo service portfolio that offers free correction data for precise point positioning in real-time. Beyond terrestrial and aeronautical applications, precise orbit determination (POD) of satellites in low Earth orbit (LEO) has been proposed as a potential use case for HAS corrections in view of their global availability. Based on HAS data collected during a test campaign in September 2021, the benefit of HAS corrections is assessed for real-time, onboard navigation as well as near real-time POD on the ground using GNSS observations of the Sentinel-6A LEO satellite. Compared to real-time POD using only broadcast ephemerides, performance improvements of about 40%, 10%, and 5% in terms of 3D position error can already be achieved for GPS-only, GPS + Galileo, and Galileo-only navigation. While Galileo processing benefits only moderately from the HAS correction data during the early tests in view of an already excellent Open Service performance, their use is highly advantageous for GPS processing and enables dual-constellation navigation with balanced contributions of both GNSSs for improved robustness. For near real-time offline POD, HAS corrections offer reduced latency or accuracy compared to established ultra-rapid GNSS orbit and clock products as well as independence from external sources.

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Section: Near Real-time Podmentioning

confidence: 99%

Orbit determination of Sentinel-6A using the Galileo high accuracy service test signal

et al. 2022

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“…Hence, an alternate approach to the RTS might be considered by utilising ultra-rapid products to ensure positioning uninterruptedly (El-Mowafy et al., 2017). The ultra-rapid products are used in a variety of studies, including near-time troposphere estimation (Satirapod et al., 2011; Hadaś et al., 2013), precise timing (Cerretto et al., 2012), clock estimation (Cao et al., 2022), examination of dynamic displacements (Yigit et al., 2020), earthquake analysis (Shu et al., 2020), time transfer (Chen et al., 2022), real-time PPP and SPP applications (Elsobeiey and Al-Harbi, 2016; Bahadur and Nohutcu, 2021; Bahadur, 2022; Geng et al., 2022; Jiang et al., 2022; Jiao and Song, 2022; Ogutcu and Farhan, 2022).…”

Section: Introductionmentioning

confidence: 99%

Sub-meter-level navigation with an enhanced multi-GNSS single-point positioning algorithm using iGMAS ultra-rapid products

Birinci

Saka

2023

J. Navigation

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Ultra-rapid products have the advantage of being used in real-time positioning with no external connections. In this study, these products provided by the international GNSS Monitoring and Assessment System (iGMAS) for four global constellations (GPS, GLONASS, Galileo and BDS-3) were assessed in terms of service rate and accuracy in navigation. In this regard, a MATLAB-based in-house code solving the problem was developed for all possible combinations of the constellations. To explore the effectiveness of the iGMAS products, the same dataset has been also processed using GFZ rapid products. The results demonstrate that the GPS and Galileo solutions were substantially comparable to the rapid products concerning service rate and accuracy, but that the GLONASS and BDS-3 iGMAS products require some enhancements. In addition, the Galileo solution produced remarkably good results both individually and in combination. The GPS/GLONASS/Galileo/BDS-3 SPP solution generated a mean root mean square (RMS) error of 0 ⋅ 54 m horizontally and 0 ⋅ 89 m vertically. Thus, GPS-only, GLONASS-only, Galileo-only and BDS-3-only solutions were improved by 42%, 79%, 28% and 74% in 3D mean RMS error with the quad system solutions, respectively.

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An efficient method for undifferenced BDS-2/BDS-3 high-rate clock estimation

Cao

Kuang

et al. 2022

GPS Solut

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Assessment of the GNSS PPP performance using ultra-rapid and rapid products from different analysis centres

Cited by 4 publications

References 22 publications

Orbit determination of Sentinel-6A using the Galileo high accuracy service test signal

Orbit determination of Sentinel-6A using the Galileo high accuracy service test signal

Sub-meter-level navigation with an enhanced multi-GNSS single-point positioning algorithm using iGMAS ultra-rapid products

An efficient method for undifferenced BDS-2/BDS-3 high-rate clock estimation

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