Near Earth Orbit Network Program's Sounder for Microwave-Based Applications

The National Aeronautics and Space Administration's Goddard Space Flight Center is pleased to release the Request for Proposal (RFP) for the Sounder for Microwave-Based Applications acquisition. This RFP replaces Draft RFP 80GSFC25R7005 issued on April 18, 2025 (including all amendments), in its entirety. All attachments to this posting together constitute the complete RFP, including all instructions, restrictions, provisions, and contract clauses. Amendment 1: The purpose of this amendment is to 1: Add Supply Chain Visibility Reporting; and 2. Correct the percentages in Attachment O - Milestone Payment Schedule. This amendment supersedes all affected areas in the RFP and previous amendments (if any). All other terms and conditions remain unchanged. Amendment 2: The purpose of this amendment is to implement updates associated with Request for Proposal (RFP) Questions and Answers 1–9. Additionally, the Government has included RFP Questions and Answers 1–9.