NextSTEP-3 APPENDIX E: Network Extension for User Continuity and Sustainability (NEXUS) Backward-Compatible Ka-Band Relay Broad Agency Announcement (BAA)

NASA is preparing to address an impending critical gap in space-to-ground communications that could emerge between 2029 and 2031 as the aging Tracking and Data Relay Satellite System deteriorates and no commercially available backward-compatible alternatives exist. To ensure uninterrupted high-data-rate communications for vital on-orbit missions, the Space Communications and Navigation program, through its NEXUS project, is issuing a broad agency announcement to develop and demonstrate new Ka-band relay capabilities that are compatible with existing user systems. This initiative specifically avoids replicating current commercial offerings and focuses on extending the operational life of critical satellite communications infrastructure by introducing a next-generation network that seamlessly integrates with legacy equipment. The solicitation, titled NextSTEP-3 Appendix E: Network Extension for User Continuity and Sustainability (NEXUS) Backward-Compatible Ka-Band Relay, is managed by the Marshall Space Flight Center and is designed to award multiple contracts for capability development and demonstration. It targets advanced engineering solutions that maintain compatibility with existing ground and space-based terminals while enabling higher data throughput through Ka-band transmissions. The effort is urgent, with no viable commercial substitutes on the horizon, and aims to secure a sustainable, NASA-led communications architecture. Point of contact for inquiries is Brooke Thornton, with Danielle Barnes serving as the Small Business Specialist, and the place of performance remains to be determined.