Lockheed Martin said Aug. 15 it delivered the spacecraft core structure, including an integrated propulsion subsystem, for the first Space-based Infrared System High (SBIRS High) geosynchronous satellite.

The propulsion subsystem will be used for maneuvering the satellite from its transfer orbit to its final location, as well as conducting on-orbit repositioning maneuvers. The subsystem consists of 18 reaction engine assemblies, a fuel tank, two oxidizer tanks and a liquid apogee engine. The design is based on Lockheed Martin’s A2100 spacecraft series.

When fully operational, SBIRS High will comprise two payloads in highly elliptical orbit, four satellites in geosynchronous orbit and fixed and mobile ground- and mobile-based assets to receive and process the infrared data. The first satellite of the SBIRS High fleet is scheduled for launch in fiscal 2008.