Nikolaos Stefas

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About

Nikolaos Stefas is a robotics researcher whose work bridges autonomous systems, wildlife conservation, and precision agriculture. His primary research areas include aerial robotics, sensor-based localization, and environmental monitoring. Stefas is best known for pioneering the use of unmanned aerial vehicles (UAVs) to localize wildlife fitted with VHF radio collars—a critical tool for conservation biologists. In his most cited work, "Active localization of VHF collared animals with aerial robots" (2016, 18 citations), he demonstrated how an off-the-shelf receiver mounted on an autonomous drone can detect and triangulate animal signals using only audio output, dramatically reducing the cost and labor of traditional ground-based tracking. He extended this work in "Aerial Radio-Based Telemetry for Tracking Wildlife" (2018, 12 citations), introducing an online, adaptive measurement strategy that enables the drone to efficiently localize animals in real time. Stefas also contributed to agricultural robotics with "Robotic Surveying of Apple Orchards" (2015, 5 citations), where he developed a low-cost, low-resolution imaging system capable of counting apples and estimating their diameters. His work exemplifies how affordable, off-the-shelf hardware can be repurposed for impactful field applications, making advanced monitoring accessible to ecologists and farmers alike.