The Space Based Infrared Systems (SBIRS) program completed its final major pre-launch test for the first geosynchronous (GEO-1) satellite.

The milestone, known as the SBIRS System Test 5001.4 Regression Test, demonstrated the ability to transmit data between the spacecraft and flight control facilities, and perform the critical operational functions of the SBIRS GEO-1 integrated ground and space system. This pre-launch test was held at various locations in Colorado and California, according to the Air Force.

“Successful completion of this critical test is a reflection of the dedication and hard work of the Team,” said Lt. Col. Douglas Sersun, acting director, SBIRS Systems Engineering and Integration.

The completion of this test marked a significant milestone in the SBIRS program because it ensured the readiness of ground and flight software products to support an early May launch.

With factory testing complete, prime contractor Lockheed Martin [LMT] shipped GEO-1 to Cape Canaveral Air Force Station, Fla., earlier this month (Defense Daily, March 7).

The satellite is currently going through a series of launch preparation tests to verify satellite integrity after shipment from the Sunnyvale, Calif., factory. These tests will verify communication compatibility between the satellite and the on-orbit operations center.

SBIRS is the next-generation U.S. early missile warning system. It is slated to replace the legacy Defense Support Program constellation. SBIRS has both scanning and staring sensors and is expected to provide new tactical support capabilities in addition to its strategic mission.

SBIRS Highly Elliptical Orbit (HEO) payloads have already been launched aboard classified satellites.

Lockheed Martin’s original SBIRS contract includes HEO payloads, two GEO satellites, as well as ground-based assets to receive and process the infrared data. The company is also under a follow-on production contract to deliver additional HEO payloads, third and fourth GEO satellites and associated ground modifications.

GEO-2 is scheduled for launch next year, according to Air Force Space Command.

Northrop Grumman [NOC] is the SBIRS payload integrator, and Air Force Space Command is the operator.