The Department of Defense, specifically the Army, is seeking proposals for the development of a Low-Altitude Passive Detection System through the Small Business Innovation Research (SBIR) program. The objective is to create a solution that can passively detect and identify small unmanned aerial systems (sUAS) operating at low altitudes (0 - 6,000 feet) and various velocities, thereby enhancing advance warning capabilities for ground-based units against potential threats. This initiative addresses current limitations in existing detection systems, which are primarily designed for larger threats at higher altitudes and are often stationary, thus hindering their operational flexibility. Proposals for Direct to Phase II funding of up to $2 million are due by May 21, 2025, with a performance period of 24 months, and interested parties can find more information at the provided source link.