GipsyX/RTGx, a new tool set for space geodetic operations and research

Bertiger, Willy; Bar-Sever, Y.; Dorsey, Angela; Haines, Bruce; Harvey, Nate; Hemberger, D.; Heflin, M. B.; Lu, Wenwen; Miller, Mark A.; Moore, A. W.; Murphy, David; Ries, Paul; Romans, L.J.; Sibois, Aurore; Sibthorpe, A.; Szilágyi, Béla; Vallisneri, Michele; Willis, Pascal

doi:10.1016/j.asr.2020.04.015

Cited by 249 publications

(148 citation statements)

References 64 publications

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“…We believe that the main difference is that SPARK uses more modern and efficient data editing and processing algorithms. It is worth noting that the GIPSY software has recently evolved into a new software called GipsyX (Bertiger et al, 2020) which uses more state-of-the-art data editing and processing compared to GIPSY. It is likely that GipsyX can resolve the problem encountered by GIPSY with the R/V Maria S. Merian data and produce solutions close to those of SPARK.…”

Section: Open Accessmentioning

confidence: 99%

Integrated water vapour content retrievals from ship-borne GNSS receivers during EUREC4A

Bosser¹,

Bock²,

Flamant³

et al. 2021

Preprint

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<p>In the framework of the EUREC4A campaign, integrated water vapour (IWV) contents were retrieved over the open Tropical Atlantic Ocean using Global Navigation Satellite System (GNSS) data acquired from three research vessels : R/V Atalante, R/V Maria S. Merian, and R/V Meteor. This study describes the GNSS processing method and compares the GNSS IWV retrievals with IWV estimates from the ECMWF fifth ReAnalysis (ERA5), from the MODIS infra-red products, and from terrestrial GNSS stations located along the tracks of the ships. The ship-borne GNSS IWVs retrievals from R/V Atalante and R/V Meteor compare well with ERA5, with small biases (-1.62 kg/m2 for R/V Atalante and +0.65 kg/m2 for R/V Meteor) and a RMS difference about ~2.3 kg/m2. The results for the R/V Maria S. Merian are found &#160;to be of poorer quality, with RMS difference of about 6 kg/m2 which are very likely due to the location of the GNSS antenna on this R/V prone to multipath effects. The comparisons with ground-based GNSS data confirm these results. The comparisons of all three R/V IWV retrievals with MODIS infra-red product show large RMS differences of 5-7 kg/m2, reflecting the enhanced uncertainties of this satellite product in the tropics. These ship-borne IWV retrievals are intended to be used for the description and understanding of meteorological phenomena that occurred during the campaign, east of Barbados, Guyana and northern Brazil.</p>

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Section: Open Accessmentioning

confidence: 99%

Integrated water vapour content retrievals from ship-borne GNSS receivers during EUREC4A

Bosser¹,

Bock²,

Flamant³

et al. 2021

Preprint

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“…+ const. (61) 3 The LRI optical frequency f M,est (t), i.e. the scale factor, is determined on a daily basis by comparing LRI and MWI range in the official GRACE-FO RL04 dataset.…”

Section: Light Time Correction In Two-way Ranging (Twr)mentioning

confidence: 99%

“…6. This results from the fact that GNI and GNV data is based on reduceddynamic orbit determination, where the variational equations include the velocity state [2,3].…”

Section: Enhancing the Light Time Correction Accuracymentioning

confidence: 99%

Revisiting the light time correction in gravimetric missions like GRACE and GRACE follow-on

Yan

Müller

Heinzel

et al. 2021

J Geod

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The gravity field maps of the satellite gravimetry missions Gravity Recovery and Climate Experiment (GRACE ) and GRACE Follow-On are derived by means of precise orbit determination. The key observation is the biased inter-satellite range, which is measured primarily by a K-Band Ranging system (KBR) in GRACE and GRACE Follow-On. The GRACE Follow-On satellites are additionally equipped with a Laser Ranging Interferometer (LRI), which provides measurements with lower noise compared to the KBR. The biased range of KBR and LRI needs to be converted for gravity field recovery into an instantaneous range, i.e. the biased Euclidean distance between the satellites’ center-of-mass at the same time. One contributor to the difference between measured and instantaneous range arises due to the nonzero travel time of electro-magnetic waves between the spacecraft. We revisit the calculation of the light time correction (LTC) from first principles considering general relativistic effects and state-of-the-art models of Earth’s potential field. The novel analytical expressions for the LTC of KBR and LRI can circumvent numerical limitations of the classical approach. The dependency of the LTC on geopotential models and on the parameterization is studied, and afterwards the results are compared against the LTC provided in the official datasets of GRACE and GRACE Follow-On. It is shown that the new approach has a significantly lower noise, well below the instrument noise of current instruments, especially relevant for the LRI, and even if used with kinematic orbit products. This allows calculating the LTC accurate enough even for the next generation of gravimetric missions.

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“…Quality Check) tool developed by UNAVCO [55]. GPS data processing is carried out using the scientific software GIPSY-X/RTGx v 1.3 developed by JPL-CALTECH-NASA [56], and made available to GeoRED under a cooperation agreement. Final orbits are used in the processing, which include satellite orbits of the GNSS constellations, satellite clock and Earth orientation parameters that are provided in the appropriate format for Gipsy-X by JPL-NASA as contribution to the International GNSS Service (IGS).…”

Section: Data Processing and Velocity Fieldmentioning

confidence: 99%

GNSS Networks for Geodynamics in the Caribbean, Northwestern South America, and Central America

Mora‐Páez¹,

Audemard²

2021

Geodetic Sciences - Theory, Applications and Recent Developments

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For several years, under the framework of national and international projects, the number of GNSS geodetic stations has been increasing in countries located in the area comprised by the Caribbean, northwestern South America and Central America. Data from these geodetic stations have made it possible not only to meet the needs for geospatial information in each of the countries, but also to get a better understanding about the geodynamic interaction of the Caribbean, South American, Nazca and Cocos plates, as well as tectonic blocks wedged in between these plates. This article presents a brief description of the tectonic framework, the existing geodetic networks and the results obtained using data from some stations in the study area.

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GipsyX/RTGx, a new tool set for space geodetic operations and research

Cited by 249 publications

References 64 publications

Integrated water vapour content retrievals from ship-borne GNSS receivers during EUREC4A

Integrated water vapour content retrievals from ship-borne GNSS receivers during EUREC4A

Revisiting the light time correction in gravimetric missions like GRACE and GRACE follow-on

GNSS Networks for Geodynamics in the Caribbean, Northwestern South America, and Central America

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