Northrop Grumman Northrop Grumman SIRU - Scalable Inertial Reference Unit for Space Motion Reference Unit (MRU)

Scalable SIRU™ combines innovation and high reliability,achieving 100% success on space missions with more than 26 million hours in orbit and 147 billion miles flown in 2013.,the hemispheric resonant gyro (HRG) sensor on the retractable SIRU™ consists of three simply machined quartz parts,the outer shell,the high-Q vibrating hemispheric resonator and the inner shell. HRG's quartz structure is inherently stable,unaffected by aging,and naturally radiation hardened. The HRG sensor operates in a complete vacuum seal,making it an ideal gyroscope for space applications.,Scalable SIRU™ Applications Scalable SIRU™ is the choice of spacecraft manufacturers for sensor pointing/stabilization and spacecraft attitude control during dem long-duration space missions,inc:,Scalable SIRU™ Advantages,Scalable SIRU™ heritage,Space Qualified Expandable SIRU™ evolved from heritage Core SIRU™. These systems have operated in space for more than 26 million hours since 1996,with a 100% mission success rate. Our legacy systems have launched 132 times and flown more than 147 billion miles for NASA,DoD,commercial and international space applications inc: Deep Impact,MESSENGER,Cassini,NEO,GLAST,EOS,Geolite,Aura,Aqua,KOMPSAT 1,GOES,601-HP,702 bus,TDRS,GPM,WGS,EchoStar,IKONOS,AEHF,A2100 bus,1300 bus,STAR bus,MUOS,SBSS,Worldview,Herschel,GeoEye,TerreStar and Landsat.,Scalable SIRU™-L configuration,Scalable SIRU™-L is a variant configuration with the same hardware and associated reliability as Scalable SIRU™. Compared with the standard expandable SIRU™-L,the expandable SIRU™-L simplifies the calibration and testing process,shortens delivery time,and reduces costs.

characteristic

• Earth orbit at all altitudes/angles
• interstellar mission
• deep space mission
• High reliability and life due to simple HRG sensor design
• Ultra-low-angle random walks with inherent dead-zone degrees of freedom
• Fault-tolerant,redundant system architecture with cross-bundled HRGs and electronics helps ensure mission endurance for 15 years or more
• Demonstrates gyroscopic performance,providing inertially stable,low-noise,wide-bandwidth benchmark
• Radiation-hardened sensors and electronics that can operate reliably when exposed to radiation for extended periods of time in space
• High reliability and life due to simple hrg sensor design
• Demonstrates gyroscope capabilities to provide inertially stable,low noise,wide bandwidth reference