The idea underlying the GAL project is the study and development of a state-of-the-art methodology for the determination of precise and high-resolution gravity field models made available by precise kinematic airborne gravimetry with EGNOS, GPS, Galileo and strapdown Inertial Measurement Units (IMUs) and its further integration with GOCE global models.
GAL concept is based on the
of satellite-derived global gravity models with
airborne-derived local models. While the
GOCE gradiometric measurements will provide the
gravity model, the airborne EGNOS/GNSS/INS
ranging and inertial measurements will provide
local ones. While GOCE gradiometry will resolve the gravity field
with an accuracy of 1-2 mgal and a geoid accuracy of
The proposed concept shall eliminate the need for large scale terrestrial gravity measurements thus allowing for affordable gravity missions over the Earth land masses and, therefore, for high resolution gravity field determination and, more specifically, for high resolution geoid determination which, in turn, is a GNSS enabler.