News

Three-dimensional modeling of the GNSS radio occultation ray path

23-05-2024

Traditional GNSS space-based and ground-based tropospheric estimates are conducted separately, which limits the horizontal and vertical resolution of tropospheric products. This study evaluates the first step toward an integrated model: the development of an effective 3D ray-tracing algorithm for satellite-to-satellite (radio occultation) path reconstruction. Using a new approach for calculating gradients and interpolating refractivities, the authors develop a new algorithm for simulation of radio-occultation (RO) paths.

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IGiG scientific seminar - Dr. Andrea Gatti

20-05-2024

IGiG is pleased to invite you to a scientific seminar to be held in the IGIG library (100G) on May 23, 2024 from 9:00-10:00 a.m. The presentation, entitled "GNSS reflectometry applied to low-cost ground receivers" will be given by Dr. Andrea Gatti from Geomatics Research & Development (GReD), Lomazzo, Italy.

Find out more about our speaker and GReD team under the link: GReD.

We look forward to seeing you all on Thursday. See abstract below.

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MultiDEFusion: an open-source library dedicated for the integration of geodetic observations

07-05-2024

MultiDEFusion is an open-source library that enables the Fusion of Multi geodetic techniques ensuring long-term observations of ground DEFormation. The software, developed in a Python environment, enables the integration of permanent GNSS observations together with InSAR radar data.



The MultiDEFusion library expands the existing approach of integrating geodetic observations introduced in the article Tondaś et al., 2023, by allowing the simultaneous application of three InSAR computational methods: DInSAR, SBAS, and PSI. Furthermore, radar observations can be derived from three independent orbits with the possibility of implementing 9 elements (pixels or PS points) for each computational method. Detailed software documentation, including references to the trial data set, is available at https://damiantondas.github.io/multidefusion.


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IGiG scientific seminar - Prof. Uwe Soergel

06-05-2024

IGiG is pleased to invite you to a scientific seminar to be held in the IGIG library (100G) on May 9, 2024 from 9:00-10:00 a.m. The presentation, entitled "Trends in Remote Sensing: Constellations, Crowd Sourcing and Services" will be given by Prof. Uwe Soergel from University of Stuttgart.

Please refer to BIO to find out more about our speaker.

We look forward to seeing you all on Thursday.

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What have we learned about BeiDou from new laser observations?

29-04-2024

Recent enhancements in global satellite navigation have taken a significant leap forward thanks to the International Laser Ranging Service (ILRS), which now tracks an additional 20 BeiDou-3 satellites orbiting the Earth. This expansion from the initial four satellites under surveillance marks a major milestone for the BeiDou Satellite Navigation System (BDS), a critical component of the global navigation structure alongside GPS and Galileo.

Our team at the Associated ILRS Analysis Center has detailed these advancements in a new study, "Satellite Laser Ranging to BeiDou-3 Satellites: Initial Performance and Contribution to Orbit Model Improvement" by Zajdel et al., 2024. You can read more about the study here: GPS Solutions, Volume 28, 100 (2024). LINK



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