[IGSMAIL-8459] Call for abstracts: IGS Workshop Session 2 "Building global GNSS-based reference frames"

[Paul Rebischung]

Dear colleagues, 

The deadline for submitting abstracts to the IGS Workshop is approaching: 3 May 2024 . 

We would like to draw your attention to Session 2 "Building global GNSS-based reference frames" (see description below). Please consider submitting an abstract to this session at: 
[ https://www.conftool.com/igs2024/ | https://www.conftool.com/igs2024/ ] 

Best regards, 
The convener team: Paul Rebischung, Rolf Dach, Tom Herring, Salim Masoumi, Oliver Montenbruck, Arturo Villiger 

Session description 

By providing long, precise position time series for a dense global network of GNSS stations, as well as accurate polar motion time series, the IGS makes a fundamental contribution to the construction of the International Terrestrial Reference Frame (ITRF). GNSS station position time series, often derived from precise IGS ephemerides, also find wide usage in the study of diverse geophysical processes. Yet, despite the tremendous progress achieved in the analysis of GNSS data over the last decades, the IGS geodetic products remain affected by random and systematic errors that limit their contribution to the ITRF and geophysical interpretation. 

In this session, we seek contributions on any improvements to the analysis and modeling of GNSS data that could further augment the value of IGS products, including ephemerides and station position time series, but also global geodetic parameters (Earth rotation parameters, geocenter coordinates and terrestrial scale estimates). Topics may include, but are not limited to: 


    * GNSS satellite orbit modeling (attitude, solar radiation pressure, other non-conservative forces, etc.); 
    * characterization of GNSS satellite antennas (estimation / validation of phase center offsets, phase variations and group delays, impact on terrestrial scale); 
    * characterization and improvement of ground GNSS antennas (comparison / validation of phase center offsets and variations, in-situ calibrations, multipath mitigation or modeling, etc.); 
    * joint processing of legacy and new (BeiDou, QZSS, NavIC) navigation satellite systems; 
    * joint processing of observations from ground- and space-based receivers; 
    * joint processing of GNSS data with other space geodetic techniques; 
    * improvements and aliasing assessment of background solid Earth, ocean and pole tide models; 
    * use of non-linear a priori TRF components (e.g., ITRF2020 seasonal station motions); 
    * statistical modeling of GNSS station position time series. 

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