[IGSMAIL-8632] PosiTim's GNSS Satellite Radiation Force Models Now Publicly Available

[florian.dilssner at positim.com]

Dear colleagues,

At the IGS Workshop in 2024, PosiTim presented its GNSS satellite 
radiation force models and promised to make them available to the GNSS 
community. After numerous iterations, tests with different parameter 
sets, an internal PosiTim competition, and extensive validation, we are 
excited to finally share our models with the GNSS community in general, 
and the IGS community in particular.

We refer to these models as Rock ’n Roll (RnR) models, a nod to the 
original GPS ROCK models developed by H. Fliegel et al. Our latest 
version, RnR25, was recently presented at the ION GNSS+ meeting and can 
now be downloaded from: https://gitlab.com/positim/RnR_models

Please make sure to read the README!

The models are completely free to download and use, but we would greatly 
appreciate it if you referenced their usage with the following 
publication:

Dilssner, Florian, Springer, Tim, “May the Force Be Simple: 
Fourier-Based Radiation Pressure Models for all GNSS Spacecraft,” 
Proceedings of the 38th International Technical Meeting of the Satellite 
Division of The Institute of Navigation (ION GNSS+ 2025), Baltimore, 
Maryland, September 2025, pp. 3251–3265. 
https://doi.org/10.33012/2025.20347

We’d very much appreciate any feedback on your experiences with the 
models!

Cheers,

Tim & Florian