The global unattended ground sensors market was valued at $520 million in 2025 and is projected to reach $810 million by 2035, representing a 4.6% CAGR from 2026 to 2035, according to SNS Insider. Demand is being supported by seismic, acoustic, infrared and multi-sensor fusion systems used for battlefield surveillance, border security, perimeter defense and critical infrastructure monitoring. North America held the largest regional share in 2025 at 43%, while Asia Pacific was the fastest-growing region with a 9% CAGR forecast. Seismic sensors led sensor types with 39% of the market, military and defense accounted for 58% of applications, fixed or stationary deployments held 64%, and military forces represented 55% of end users. Northrop Grumman expanded its portfolio in 2025 with a network-centric multi-sensor fusion system for border security, while Elbit Systems introduced systems with longer battery life and AI-based target classification.