[IGSMAIL-7662] Asking for abstracts on orbit modelling for the IGS Workshop 2018

[Rolf Dach]

Author: Rolf Dach (AIUB) and Tim Springer (ESOC)

Dear colleagues,

as you know, the next IGS workshop will be held in Wuhan, China from 
Oct. 29 to Nov. 03, 2018. The time is running and the deadline for the 
abstract submission is approaching in about one week: August 22.

Tim and me are organizing the session on orbit modeling where we hope to 
get a nice overview on the progress in this field within the scientific 
community in general and the IGS in particular.
For this we need your contributions!

All further information (including the abstract submission page) can be 
found at http://igsworkshop2018.gnsswhu.cn

Best regards

Tim and Rolf



Session description:
-------------------
Accurately modelling the GNSS satellites orbits is a key issue for the 
quality of the IGS products. The surface force models together with the 
estimated (orbit) parameters are probably the most important sources of 
differences between analysis centers products (effect of SRP models and 
attitude, albedo models, modelling methods like box and wings, 
semi-empirical, empirical, etc). The use of different constellations 
will change the errors characteristics observed in the results 
(draconitic effects, ...), so the impact of the different constellation 
dynamic characteristics has to be considered (geometry, planes, 
inclination, period...). The length of the orbital arcs used in the 
solutions to achieve optimal multi-constellation solutions, using for 
example longer arcs than the usual daily solutions, is also an issue to 
be addressed. We are looking for contributions related to the general 
topic of GNSS orbit modelling but we are especially interested in 
contributions that will help to advance the quality of the IGS orbit 
products and in particular the multi-GNSS IGS products.