Performance Evaluation of Troposphere Estimated from Galileo-Only Multi-Frequency Observations

Zhao, Liang; Václavovic, Pavel; Douša, Jan

doi:10.3390/rs12030373

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ Galileo observations allow to compute postprocessed ZTD with a similar precision as with GPS, that is, 5.8 and 6.2 mm, respectively [20]. Adding observations from the third frequency further improves the precision by 4%.…”

Section: Introductionmentioning

confidence: 99%

Benefits of Using Galileo for Real-Time GNSS Meteorology

Hadaś

Hobiger

2021

IEEE Geosci. Remote Sensing Lett.

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Remote sensing of water vapor using Global Navigation Satellite Systems (GNSS) is a well-established tool for weather and climate monitoring. The current challenges of GNSS meteorology are real-time performance and the inclusion of emerging GNSS, such as Galileo. We demonstrate that real-time GPS-only, Galileo-only, and GPS+Galileo solutions are consistent among each other. However, our results show that the Galileo-only solutions tend to underestimate Zenith Total Delay (ZTD) with respect to GPS. The Galileo-only real-time ZTD is less accurate as the one from GPS. The combination of both GNSS leads to a superior product. The daily solution availability increases by up to 50%, and the overall gain is 0.7% over the entire year. The accuracy improves by 3.7% to 8.5% and uncertainty is reduced by a factor of 1.5-2. A combined GPS and Galileo solution suppresses artifacts in a real-time ZTD product which otherwise would be attributed to high-frequency orbital effects.

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Section: Introductionmentioning

confidence: 99%

Benefits of Using Galileo for Real-Time GNSS Meteorology

Hadaś

Hobiger

2021

IEEE Geosci. Remote Sensing Lett.

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“…As the ambiguities are resolved as float in the PPP filter, the elevation-dependent receiver PCO variations can be absorbed by the ambiguities, thus not affecting the PPP coordinate solutions [20]. Note that the products for satellite orbit/clock corrections and differential code biases (DCBs) corrections are from different centers.…”

Section: Processing Strategiesmentioning

confidence: 99%

Comparison Analysis on the Accuracy of Galileo PPP Using Different Frequency Combinations in Europe

Song

Zhao

2021

Applied Sciences

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The Galileo constellations are characterized by transmitting GNSS signals on multi-frequencies, which can benefit the robustness and accuracy of the solutions. However, the dual-frequency E1/E5a combinations are generally used for precise point positioning (PPP). In this paper, the performance of Galileo static and kinematic PPP using different dual- and multi-frequency combinations are assessed using observations from the European region. Overall, the accuracy of daily PPP achieved by the dual-frequency GPS, Galileo, and BDS is better than 5 mm in the horizontal direction and better than 10 mm in the vertical direction. Though the number of observed Galileo satellites is less than GPS, the horizontal accuracy can reach 1.6 mm/2.3 mm/5.7 mm on North/East/Up component, which is improved by 59.0% and 12.3% compared to the GPS in the north and up direction. Then, the accuracy of Galileo static PPP is analyzed using different dual- and multi-frequency combinations. Results indicate that the Galileo E1/E5b PPP can degrade the accuracy due to the inter-frequency clock biases between the E1/E5a and E1/E5b combinations. Best accuracy can be achieved for the triple- and four-frequency PPP, which is 4.8 mm in the up direction. The hourly accuracy for the static PPP can reach 5.6 mm/9.2 mm/12.6 mm in the north/east/up direction using the GPS/Galileo/GLONASS/BDS combinations. Finally, a positioning convergence ratio (PCR) indicator, which represents the accuracy of PPP over a period, is used to analyze the convergence time of kinematic PPP. Results indicated that the multi-frequency Galileo observations contribute minorly to the convergence of kinematic PPP. However, Galileo shows the best convergence performance for the single GNSS positioning, and the GPS/Galileo combined PPP achieved the best performance for the PPP using different GNSS combinations.

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“…Thanks to the precise GNSS clock and orbit products released by the International GNSS Service (IGS) [ 4 ] and the Multi-GNSS Experiment (MGEX) [ 5 ], PPP has already been widely applied in various services and applications, such as positioning [ 6 ], navigation, timing [ 7 , 8 ], geodesy, atmosphere monitoring [ 9 , 10 ], and low Earth orbit (LEO) satellite orbit determination [ 11 ]. However, the accuracy and reliability of PPP performance is mainly based on the quality of the clock and orbit products employed by the users.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Precise Orbit and Clock Products for BDS-3 from Different Analysis Centers

Shen

Fang

et al. 2021

Sensors

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A quality evaluation of precise products for BDS-3 constellations is presented for the first time in this contribution. Then, the tropospheric delay retrieval and positioning performance of BDS-3 precise point positioning (PPP) solutions using the precise products (gbm, wum, iac, sha, cnt) with observations from 24 stations from DOY 280 to 317 in 2020 was comprehensively investigated. The orbit comparisons present consistencies of 0.09–0.22 m for the C19–C37 satellites and of 0.5–1.2 m for the C38–C46 satellites among the final products. The standard deviation (STD) values of the clock differences of iac showed the best agreement with those of gbm, followed by wum, sha. The clock differences performance of cnt was the worst. For BDS-3 PPP solutions with five Analysis centers (ACs) products, the median convergence times of static PPP mode incorporating the gbm, wum, iac, sha, and cnt products were 31.0, 33.5, 34.5, 37.8, and 72.0 min, respectively; the median convergence times of kinematic PPP model incorporating the same products were 40.5, 41.0, 50.5, 55.0, and 94.0 min, respectively. The positioning accuracies in the static and kinematic modes were approximately 1–4 cm, 2–6 cm in the horizontal and vertical components, respectively. With the final products in kinematic mode, the performance of PPP with real-time products (cnt) is poorer than all PPP with final products. The median of ZTD accuracies of the five products gbm, wum, iac, sha, and cnt were 7.84, 7.58, 7.04, 7.19, and 10.1 mm, respectively, and the accuracy differences were very small among five AC products (gbm, wum, iac, sha).

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Performance Evaluation of Troposphere Estimated from Galileo-Only Multi-Frequency Observations

Cited by 11 publications

References 34 publications

Benefits of Using Galileo for Real-Time GNSS Meteorology

Benefits of Using Galileo for Real-Time GNSS Meteorology

Comparison Analysis on the Accuracy of Galileo PPP Using Different Frequency Combinations in Europe

An Investigation of Precise Orbit and Clock Products for BDS-3 from Different Analysis Centers

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