Evaluation of Airborne Gravimetry Integrating GNSS and Strapdown INS Observations
Airborne gravimetry systems provide the most economical way to improve the spatial resolution of gravity data measured by satellite missions.
So the paper deals with the presentation of a modern airborne gravitymeter designed, developed and tested at the university FAF Munich. The specific forces are measured by a high precision strapdown INS and the kinematical accelerations are derived using numerous differential GNSS observations.
So the first part of the paper describes the system architecture, the test environment and the area of two finished flight test campaigns. The error models of GNSS and INS measurements are demonstrated and evaluated in regard to airborne gravimetry applications.
In this context the derivation of kinematical accelerations out of GNSS raw data is investigated. Thereby the additional performance potential of five GNSS receivers in the aircraft and twelve reference stations along the flight trajectory for acceleration determination is taken into account.
In the scope of integration filter design important aspects are emphasized concerning the low dynamic input data and the analogue processing of GNSS and INS data streams. Finally a first result of the observed gravity signal is presented.
KeywordsAirborne gravimetry acceleration determination strapdown inertial navigation system
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