The RUAG Spacecraft Management Unit (SMU) is the main on-board computer of several planned and active spacecrafts, e.g.
FIXME: Herschel](../../../TBR/UserApp/Space/Herschel) and Planck](../../../TBR/UserApp/Space/Planck).
It uses a SPARC V7 or SPARC V8 processor and is delivered with software drivers, designed for use with the RTEMS operating system.
It is developed by the Swedish company RUAG Space AB, formerly known as Saab Space AB and Saab Ericsson Space AB.