Conceptual design for car based vector gravimetry
21/09/2016 | 16:30 | Session 4: Global gravity field modelling
Author(s): Peter Schack, Christian Ackermann, Christian Gerlach, Roland Pail and Thomas Gruber
Peter Schack, Christian Ackermann, Christian Gerlach, Roland Pail and Thomas Gruber
Airborne gravimetry is performed for already more than 20 years. It is an approved method of gravity field determination for the regional scope. In the beginning, leveled relative gravimeters fixed to a gimbal mounting were used for scalar gravimetry. Around the turn of the century, strapdown systems evolved. Those systems are directly fixed to the vehicle and include three orthogonal accelerometers and gyroscopes, respectively. Thus, vector gravimetry is practicable by using more robust and less expensive sensors.
The Institute of Astronomical and Physical Geodesy (IAPG) is in possession of a navigation-grade ringlaser strapdown inertial measurement unit (SIMU). This type of SIMU was already used in airborne gravimetry projects, reaching accuracy levels of a few milligal [mGal]. However, the realization of airborne projects is cost-intensive and the sensitivity to the high frequency spectrum of the gravity field is limited due to the observation height. Therefore, we plan to apply the SIMU to car based vector gravimetry. To be precise, we want to interpolate deflections of the vertical and the magnitude of the gravity vector between defined points with this method. This contribution includes our innovative measurement concept for car based vector gravimetry and introduces essential sensors, as well as ancillary sensor candidates, for this approach.