@inproceedings{AmmalladeneVenkataSeidelHalbeetal.2021, author = {Ammalladene-Venkata, Manogna and Seidel, Christian and Halbe, Omkar and Groitl, Christine and Stahl, Christoph}, title = {Deep Learning Based Obstacle Awareness from Airborne Optical Sensors}, booktitle = {77th Annual Vertical Flight Society Forum and Technology Display (FORUM 77), the Future of Vertical Flight}, publisher = {Vertical Flight Society}, address = {Fairfax}, isbn = {978-1-7138-3001-6}, doi = {https://doi.org/10.4050/F-0077-2021-16905}, year = {2021}, language = {en} } @article{AmmalladeneVenkataHalbeSeideletal.2023, author = {Ammalladene-Venkata, Manogna and Halbe, Omkar and Seidel, Christian and Groitl, Christine and Kramel, Lothar and Stahl, Christoph and Seidel, Heiko}, title = {Deep Learning Based Obstacle Awareness from Airborne Optical Sensors}, volume = {68}, journal = {Journal of the American Helicopter Society}, number = {4}, publisher = {Vertical Flight Society}, address = {Fairfax}, issn = {2161-6027}, doi = {https://doi.org/10.4050/JAHS.68.042012}, pages = {42012 -- 42024}, year = {2023}, abstract = {Aviation statistics identify collision with terrain and obstacles as a leading cause of helicopter accidents. Assisting helicopter pilots in detecting the presence of obstacles can greatly mitigate the risk of collisions. However, only a limited number of helicopters in operation have an installed helicopter terrain awareness and warning system (HTAWS), while the cost of active obstacle warning systems remains prohibitive for many civil operators. In this work, we apply machine learning to automate obstacle detection and classification in combination with commercially available airborne optical sensors. While numerous techniques for learning-based object detection have been published in the literature, many of them are data and computation intensive. Our approach seeks to balance the detection and classification accuracy of the method with the size of the training data required and the runtime. Specifically, our approach combines the invariant feature extraction ability of pretrained deep convolutional neural networks (CNNs) and the high-speed training and classification ability of a novel, proprietary frequency-domain support vector machine (SVM) method. We describe our experimental setup comprising the CNN + SVM model and datasets of predefined classes of obstacles—pylons, chimneys, antennas, TV towers, wind turbines, helicopters—synthesized from prerecorded airborne video sequences of low-altitude helicopter flight. We analyze the detection performance using average precision, average recall, and runtime performance metrics on representative test data. Finally, we present a simple architecture for real-time, onboard implementation and discuss the obstacle detection performance of recently concluded flight tests.}, language = {en} } @inproceedings{SeidelSchwartzKielhorn2008, author = {Seidel, Christian and Schwartz, Ingo and Kielhorn, Peter}, title = {Helicopter collision avoidance and brown-out recovery with HELLAS}, booktitle = {Electro-Optical Remote Sensing, Photonic Technologies, and Applications II}, editor = {Kamerman, Gary W. and Steinvall, Ove K. and Lewis, Keith L. and Merlet, Thomas J. and Hollins, Richard C.}, publisher = {SPIE}, address = {Bellingham}, isbn = {978-0-8194-7346-2}, doi = {https://doi.org/10.1117/12.800180}, year = {2008}, language = {en} } @inproceedings{SeidelSamuelisWegneretal.2006, author = {Seidel, Christian and Samuelis, Christian and Wegner, Matthias and M{\"u}nsterer, Thomas and Rumpf, Thomas and Schwartz, Ingo}, title = {Novel approaches to helicopter obstacle warning}, booktitle = {Laser Radar Technology and Applications XI}, editor = {Kamerman, Gary W. and Turner, Monte D.}, publisher = {SPIE}, address = {Bellingham}, isbn = {978-0-8194-6270-1}, doi = {https://doi.org/10.1117/12.664042}, year = {2006}, language = {en} } @inproceedings{SeidelTrommer2004, author = {Seidel, Christian and Trommer, Gert F.}, title = {Modeling of bias errors in fiber optic gyroscopes with new simulation tool}, booktitle = {Integrated Optics and Photonic Integrated Circuits}, editor = {Righini, Giancarlo C. and Honkanen, Seppo}, publisher = {SPIE}, address = {Bellingham}, isbn = {978-0-8194-5374-7}, doi = {https://doi.org/10.1117/12.544087}, year = {2004}, language = {en} } @article{SeidelTrommer2005, author = {Seidel, Christian and Trommer, Gert F.}, title = {Modelling of Fibre-Optic Gyroscopes with Low-Coherence Light Sources}, volume = {25}, journal = {International Journal of Modelling and Simulation}, number = {2}, publisher = {Taylor \& Francis}, address = {London}, issn = {0228-6203}, doi = {https://doi.org/10.1080/02286203.2005.11442320}, pages = {71 -- 78}, year = {2005}, language = {en} } @inproceedings{SeidelTrommer2004, author = {Seidel, Christian and Trommer, Gert F.}, title = {Measurement of nonlinear effects in fiber optic gyroscopes with different light sources}, booktitle = {Second European Workshop on Optical Fibre Sensors}, editor = {Lopez-Higuera, Jose Miguel and Culshaw, Brian}, publisher = {SPIE}, address = {Bellingham}, isbn = {978-0-8194-5434-8}, doi = {https://doi.org/10.1117/12.566720}, year = {2004}, language = {en} } @inproceedings{SeidelTrommer2004, author = {Seidel, Christian and Trommer, Gert F.}, title = {Bias Errors in Fiber-Optic Gyroscopes Caused by Lyot Depolarizers}, booktitle = {Symposium Gyro Technology 2004, Stuttgart, Germany, September 21/22, 2004}, editor = {Sorg, Helmut}, publisher = {Universit{\"a}t Stuttgart}, address = {Stuttgart}, pages = {8.0 -- 8.12}, year = {2004}, language = {en} } @article{SalamatBencicElsbacheretal.2023, author = {Salamat, Babak and Bencic, Daniel and Elsbacher, Gerhard and Seidel, Christian and Tonello, Andrea M.}, title = {Investigating Integral Reinforcement Learning to Achieve Asymptotic Stability in Underactuated Mechanical Systems}, volume = {9}, journal = {IEEE Robotics and Automation Letters}, number = {1}, publisher = {IEEE}, address = {New York}, issn = {2377-3766}, doi = {https://doi.org/10.1109/LRA.2023.3332556}, pages = {191 -- 198}, year = {2023}, language = {en} } @unpublished{SalamatMatternOlzemetal.2025, author = {Salamat, Babak and Mattern, Dominik and Olzem, Sebastian-Sven and Elsbacher, Gerhard and Seidel, Christian and Tonello, Andrea M.}, title = {GMP3: Learning-Driven, Bellman-Guided Trajectory Planning for UAVs in Real-Time on SE(3)}, publisher = {arXiv}, address = {Ithaca}, doi = {https://doi.org/10.48550/arXiv.2509.21264}, year = {2025}, abstract = {We propose GMP3, a multiphase global path planning framework that generates dynamically feasible three-dimensional trajectories for unmanned aerial vehicles (UAVs) operating in cluttered environments. The framework extends traditional path planning from Euclidean position spaces to the Lie group SE(3), allowing joint learning of translational motion and rotational dynamics. A modified Bellman-based operator is introduced to support reinforcement learning (RL) policy updates while leveraging prior trajectory information for improved convergence. GMP3 is designed as a distributed framework in which agents influence each other and share policy information along the trajectory: each agent refines its assigned segment and shares with its neighbors via a consensus-based scheme, enabling cooperative policy updates and convergence toward a path shaped globally even under kinematic constraints. We also propose DroneManager, a modular ground control software that interfaces the planner with real UAV platforms via the MAVLink protocol, supporting real-time deployment and feedback. Simulation studies and indoor flight experiments validate the effectiveness of the proposed method in constrained 3D environments, demonstrating reliable obstacle avoidance and smooth, feasible trajectories across both position and orientation. The open-source implementation is available at https://github.com/Domattee/DroneManager.}, language = {en} } @article{SalamatMatternOlzemetal.2026, author = {Salamat, Babak and Mattern, Dominik and Olzem, Sebastian-Sven and Elsbacher, Gerhard and Seidel, Christian and Tonello, Andrea M.}, title = {GMP3: Learning-Driven, Bellman-Guided Trajectory Planning for AAVs in Real-Time on SE(3)}, volume = {14}, journal = {IEEE Access}, publisher = {IEEE}, address = {New York}, issn = {2169-3536}, doi = {https://doi.org/10.1109/ACCESS.2026.3661193}, pages = {22720 -- 22733}, year = {2026}, abstract = {We propose GMP3, a multiphase global path planning framework that generates dynamically feasible three-dimensional trajectories for unmanned aerial vehicles (UAVs) operating in cluttered environments. The framework extends traditional path planning from Euclidean position spaces to the Lie group SE(3), allowing joint learning of translational motion and rotational dynamics. A modified Bellman-based operator is introduced to support reinforcement learning (RL) policy updates while leveraging prior trajectory information for improved convergence. GMP3 is designed as a distributed framework in which agents influence each other and share policy information along the trajectory: each agent refines its assigned segment and shares with its neighbors via a consensus-based scheme, enabling cooperative policy updates and convergence toward a path shaped globally even under kinematic constraints.We also propose DroneManager, a modular ground control software that interfaces the planner with real UAVs platforms via the Micro Air Vehicle Link (MAVLink) protocol, supporting real-time deployment and feedback. Simulation studies and indoor flight experiments validate the effectiveness of the proposed method in constrained 3D environments, demonstrating reliable obstacle avoidance and smooth, feasible trajectories across both position and orientation.}, language = {en} }