Abstract
AbstractAirborne gravimetry using a combination of GPS and a strapdown inertial measurement unit (IMU) is a well known method. We will present preliminary results of a flight campaign that was carried out in a Cessna 172 with a navigation grade IMU (iNAV-RQH) over a \(20 \times 20\,\textrm{km}\) region in the German Alps. The experiment can be considered an extreme case with dense mapping of a very local area with rough gravity field in a very small aircraft. The recovered gravity disturbance along the trajectory is checked for internal consistency at crossover points. This indicates a precision of the solution in the range of 3 mgal for a spatial resolution for 2 km. Besides classical DGPS we also make use of absolute Precise Point Positioning (PPP), which is an useful alternative if it comes to post-processing solutions, especially for remote areas. The results indicate that the accuracy of the PPP solution is well suited for airborne gravimetry.Key wordsAirborne gravimetryPrecise point positioningINS/GPS
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