Author

Christos Alexandris

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Review Open access Oct 2026

Hybrid Unmanned Underwater Vehicles: A Review of Architectures, Enabling Technologies, and Engineering Trade-Offs

Hybrid underwater robotic vehicles integrate features typically found in separate classes of vehicles: autonomous underwater vehicles (AUVs), remotely operated vehicles (ROVs), amphibious robots, and cross-medium robotic vehicles. We review this field from a system-level perspective and identify four types of hybridiza...

Christos Alexandris, Dimitrios D. Piromalis, P. Papageorgas · Drones · 0 citations

Review Open access Sep 2026

Underwater Optical Imaging Systems: A Comprehensive Review of Technologies, Architectures and Mission-Driven Design Trade-Offs

Underwater optical imaging plays a crucial role in marine exploration, ecological monitoring, underwater inspection, autonomous navigation, and scientific research, but it is heavily restricted by wavelength-dependent attenuation, scattering, refraction, and low visibility. This comprehensive review examines underwater...

Dimitrios D. Piromalis, Christos Alexandris, P. Papageorgas · Italian National Conference... · 0 citations

Open access Sep 2026

Mode-Aware Adaptive Navigation for Autonomous Underwater Vehicles Using Multimodal Sensing and Optical Feedback in Simulation Environment

Autonomous underwater vehicles require the integration of inertial, velocity, optical, and acoustic measurements for reliable underwater navigation where GPS signals are unavailable or intermittent. During a mission, the utility of these modalities may vary due to changes in environmental visibility, Doppler velocity l...

Christos Alexandris, P. Papageorgas, Dimitrios D. Piromalis · Applied Sciences · 0 citations