The Department of Defense, specifically the United States Air Force (USAF), is seeking proposals for the development of a low-cost, low size, weight, and power (SWaP) radar warning receiver (RWR) payload intended for integration on small satellites operating in geostationary orbit (GEO). The objective is to create a compact RWR that can detect and characterize radar emissions, providing real-time threat indications to enhance space domain awareness (SDA) missions, while ensuring compatibility with existing spacecraft interfaces and meeting stringent cybersecurity requirements. This initiative is crucial for improving the resilience and effectiveness of the U.S. Space Force's capabilities in an increasingly contested space environment. The solicitation is set to open on August 27, 2025, with proposals due by September 24, 2025, and further details can be found at the official DOD SBIR website.