Potential NASA Commercial Applications: The SBIR is producing product valuable to NASA across a breadth of missions such as ISS, TIROS, Stardust, Mini-Sat, and CubeSats. The scintillation-hardening improves the reliability of GPS for lower-orbit missions and the STRS-compliance permits mission redundancy. A software-defined radio implementation allows a single hardware element to function as either a conventional radio, or GPS, providing backup and redundancy for platforms such as the ISS and high-value remote sensing platforms. Packages such as the Stardust mission's return capsule can benefit from the flexibility of a software defined radio implementation that can provide GPS and communications from a single hardware system, saving cost, weight, and power. Scintillation hardening improves mission reliability and flexibility. Lower cost, low-orbit missions benefit directly from the STRS-compliant software package that enables low-cost, single-radio hardware systems that can function as a communications system or GPS system. Because scintillation effects increase at the lower altitudes, mission reliability will be improved with the scintillation hardening.