SDA's navigation capabilities for PWSA: GPS-independent navigation

SDA’s navigation capabilities will establish GPS-independent navigation for the Proliferated Warfighter Space Architecture (#PWSA), leveraging two-way time transfer (TWTT) and ranging from the Optical Intersatellite Satellite Links (OISL) of the Network Established Beyond the Upper Limits of the Atmosphere (NEBULA) optical mesh. The Navigation Layer has three principal goals for the PWSA. First, PWSA will maintain continuity of operations and navigation warfare (NAVWAR) resilience. Second, the PWSA will provide GNSS situational awareness (SA) data to the warfighter via the NEBULA from potential GNSS terrestrial interference sources. Finally, the PWSA will provide emerging military use-cases space-based PNT Services through both embedded TWTT and ranging within its space-to-ground communication links and from a dedicated PNT signal service. In this way, by maintaining continuity of operations in the absence of GPS, the PWSA provides alternative PNT to the warfighter. #GetToKnowSDA #SemperCitius #Space #Defense