查看文章

Long-term and fine-grained maritime localization and sensing are challenging due to sporadic connectivity, constrained power budget, limited footprint, and hostile environment. In this article, we present the design considerations and implementation of LocoMote, a rugged ultralow-footprint undersea sensor tag with on-device AI-driven localization, online communication, and energy-harvesting capabilities. LocoMote uses on-chip (< 30 kB) neural networks to track underwater objects within 3 m with 6 min of Global Positioning System (GPS) outage from 9-degrees of freedom (DoF) inertial sensor readings. The tag streams data at 2–5 kb/s ( bit error rate) using piezoacoustic ultrasonics, achieving an underwater communication range of more than 50 m while allowing up to 55 nodes to concurrently stream via randomized time-division multiple access. To recharge the battery during sleep, the tag uses an aluminum …