DSP-11

Between 1975 and 1985, the Soviet threat expanded, featuring longer-range SLBMs, MRV and MIRV missiles, mobile ICBMs, and ASAT systems. In response, the DSP system introduced MOS/PIM satellites with multi-orbit capability, operating in both geosynchronous and highly elliptical orbits. These satellites were heavier (1170 kg) with increased electronic packages for survivability and extended orbital life to three years. Electrical capacity was raised to 500 Watts. MOS/PIM satellites can be distinguished by three electronic packages located 90 degrees apart on the satellite's conical section.