The objective of this SBIR program is to improve operational performance of US Army missile systems by enhancing position, navigation, and timing (PNT) for operation in GPS contested environments. The PNT system for the missile platforms will also require the system to be ruggedized to withstand shock during launch and operation with speeds spanning many mach. Mayflower proposes to develop and demonstrate a highly resilient, modular, self-sufficient navigation system, termed RAPS, to address the Armys requirements for a ruggedized assured PNT technology. The RAPS system will incorporate a multitude of sensors including a very small SWaP military GPS receiver and a very small SWaP high performance GPS Anti-Jam system, further integrated with a suite of sensors and signals of opportunity that will provide assured PNT to the Army missile systems and other small SWaP platforms in strong jamming and spoofing of GPS signals. The completed RAPS Phase I (Base Program) feasibility study identified the system requirements, developed a system architecture encompassing hardware components as well as software enhancements, including the development of an innovative navigation algorithm. In the Phase II program, Mayflower will implement, test and demonstrate the RAPS system A-PNT (Assured Position, Navigation and Time) performance on a GPS