Lockheed Martin completed a successful system design review (SDR) of the TSAT Mission Operations System (TMOS) with the U.S. Air Force, the company announced June 4.

In January, the company announced that under a $2 billion contract Lockheed Martin Integrated Systems and Solutions would develop the TMOS to provide operational and network management for TSAT, the Air Force’s follow-on to the Advanced EHF satellite constellation program.

The completion of the SDR precedes the next critical phase of the TSAT program, the Space Segment final competition and award. The Space Segment request for proposal (RFP) is scheduled for release in the near future, Lockheed Martin reported, with a decision on the winning contractor team for the Space Segment expected later this year.