ing accurate, high-rate pose estimates from proprioceptive and/or exteroceptive measurements is the first step in the development of navigation algorithms for agile mobile robots such as Unmanned Aerial Vehicles (UAVs). In this paper, we propose a decoupled multi-sensor fusion approach that allows the combination of generic 6D visual-inertial (VI) odometry poses and 3D globally referenced positions to infer the global 6D pose of the robot in real-time. Our approach casts the fusion as a real-time alignment problem between the local base frame of the VI odometry and the global base frame. The quasi-constant alignment transformation that relates these coordinate systems is continuously updated employing graph- based optimization with a sliding window. We evaluate the presented pose estimation method on both simulated data and large outdoor experiments using a small UAV that is capable to run our system onboard. Results are compared against different state-of-the-art sensor fusion frameworks, revealing that the proposed approach is substantially more accurate than other decoupled fusion strategies. We also demonstrate comparable results in relation with a finely tuned Extended Kalman Filter that fuses visual, inertial and GPS measurements in a coupled way and show that our approach is generic enough to deal with different input sources in ner, as well as able to run in real-time.
Graph-Optimization base multi-sensor fusion for robust UAV pose estimation
2017-09-01
Theses
Electronic Resource
English
DDC: | 629 |
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