Defense Support Program / Space Based Infrared System

The Space-Based Infrared System (SBIRS): SBIRS is an additional element that future MD systems will utilize. SBIRS (High) is being developed by the Air Force as part of the early warning system upgrade, which will replace the Defense Support Program (DSP) satellites. In its MD mission, the SBIRS (High) constellation of sensor satellites will acquire and track ballistic missiles throughout their trajectory. This information will provide the earliest possible trajectory estimate to the BM/C3 element. By providing this “over-the-horizon” precision tracking data to the MD system, the effective MD battle space is expanded to permit interceptors to be launched before threats come within range of the XBR, which is critical for effective Missile Defense.