Centralized PPO-Based DRL for Multi-UAV-BS Positioning and Trajectory Optimization in Disaster Response Networks

This document is an arXiv digest summarizing recent research across wireless communications, sensing, navigation, and ML for cyber-physical systems. Key items: (1) centralized PPO-based multi-UAV-BS positioning and trajectory optimization for GPS-free disaster-response networks (DRL for coordinated UAV base stations); (2) case study of distributed acoustic sensing (DAS) signatures vs AIS on a live subsea fibre link, highlighting gaps between physical cable measurements and cooperative vessel reporting with implications for cable protection; (3) physics-informed, domain-invariant AoA estimation