The recent C-130PC Quiet Knight demonstrations advanced the state of the art in passive ranging by exploiting emitter phenomena. Using data from recent flight tests on the Quiet Knight program, Litton Amecom demonstrated techniques for air-to-ground ranging using Doppler measurements on the emitter. The Quiet Knight program was sponsored by Air Force Research Laboratory Advanced Architecture & Integration Branch [IFSC] at Wright Patterson AFB, which develops and demonstrates advanced embedded system architectures and system integration concepts for legacy and future platforms. The Branch conducts research and development programs ranging from constructive to real-time/hardware-in-the-loop simulation technology to support effectiveness evaluations and demonstrations of the evolving technologies. The Quiet Knight Display Processor provided by PortalSoft Technologies of Albuquerque NM included a Digital Map Display (with HSD, flight plan, route/threat data overlay), Ridgeline display, and a Terrain following/Terrain avoidance display.