The principal objectives of the scientific work of Sub- Commission 1.1 in collaboration
Develop common modelling standards and processing strategies.
Comparison and combination of orbits derived from different space geodetic techniques.
Explore and develop innovative combination aspects such as, e.g., GPS and VLBI measurements based on the same high-accuracy clock, VLBI observations to GNSS satellites, and the combination of atmospheric information (troposphere and ionosphere) of more than one technique.
Establish methods to validate the combination results (e.g., with global geophysical fluids data).
Explore, theoretically and practically, the interactions between the gravity field parameters, EOPs, and reference frames (site coordinates and velocities plus extended models), improve the consistency between these parameter groups, and assess, how a correct combination could be performed.
Study combination aspects of new geodetic methods such as Synthetic Aperture Radar (InSAR), LIDAR and optical image analysis methods.
Additional objectives of Sub-Commission 1.1 are:
Promotion of international scientific cooperation.
Coordination of common efforts of the space geodetic techniques concerning standards and formats (together with the IERS and GGOS).
Organization of workshops and sessions at meetings to promote research. - Establish bridges and common activities between SC1.1 and the IAG Services.