SIRU™ Inertial Reference Unit for Space - Core
Northrop Grummans SIRU™- Core is an internally redundant inertial reference unit (IRU) designed to provide continuous, high accuracy inertial measurement over long periods in space. The SIRU™ is a space-flight proven, radiation hard IRU which uses the solid-state Hemispherical Resonator Gyro (HRG) to provide high accuracy, ultrahigh reliability, and long life in a small lightweight unit. A single SIRU™ unit provides complete redundancy, including four HRG's, two sensor electronics modules and two power supplies. The combination of a fault tolerant design, the ultra-high reliability of the HRG and the use of high reliability electronics enables the SIRU™ to operate continuously over 15 years in space with an estimated reliability of 0.995.