GENESIS: co-location of geodetic techniques in space

Improving and homogenizing time space reference systems on Earth and, more directly, realizing the Terrestrial Reference Frame (TRF) with an accuracy of 1mm a long-term stability 0.1mm/year are relevant for many scientific societal endeavors. The knowledge TRF is fundamental navigation sciences. For instance, quantifying sea level change strongly depends accurate determination geocenter motion but also positions continental island stations, as well ground stations tracking networks. Also, numerous applications in geophysics require absolute millimeter precision from frame, example monitoring tectonic or crustal deformation predicting natural hazards. to be achieved represents consensus various authorities which has enunciated geodesy requirements Today we still far these ambitious goals realization TRF. However, combination co-location all four geodetic techniques one satellite platform can significantly contribute achieving goals. This purpose GENESIS mission, proposed component FutureNAV program European Space Agency. will dynamic observatory carrying instruments referenced another through carefully calibrated ties. solve inconsistencies biases between different order reach endorsed by international community. this white paper review state-of-the-art explain benefits mission sciences, sciences metrology.