Space surveillance of satellites ar GEO.
Space surveillance of satellites ar GEO.
Space surveillance of satellites ar GEO.
Expected to be operational before GEO 1.
Defect in communications system; still has not entered service as of 2013. Uses infrared sensors to detect and track missile launches; equipped with both scanning and staring instruments. Will eventually replace DSP system.
Use sensors on the two spacecraft to track ballistic missiles.