Scalable SIRU™ Inertial Reference Unit for Space
The high reliability Scalable SIRU™ ensures precision performance for critical space missions
The Hemispherical Resonator Gyro (HRG) sensor is composed of three simple machined quartz parts—a high-Q vibrating hemispherical resonator, and inner and outer shells which support the resonator within. The quartz construction of the HRG is inherently stable, impervious to aging effects, and naturally radiationhard. Operating in a completely vacuated hermetically sealed case, the HRG sensor is not affected by any phenomena that could make it wear out or limit its life—making it an ideal gyro for space applications.
Scalable SIRU™ unique benefits for space applications
The HRG-based Scalable SIRU™ incorporates unmatched features:
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Proven high reliability and long life, due to the simple HRG sensor design
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HRG technology offers ultra-low angle random walk and is inherently free of dead band
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Fault-tolerant, redundant system architecture with cross-strapped HRGs and electronics, ensuring success for missions lasting 15 or more years
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Demonstrated gyro capability, providing an inertially stable, low noise, wide bandwidth reference
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Radiation hard sensors and electronics that operate reliably when subjected to long-term radiation exposure in space
Heritage
The space qualified Scalable SIRU™ evolved from the heritage Core SIRU™, which has operated in space since 1996 for over 16 million hours with 100 percent mission success. SIRU™ systems have been launched more than 100 times for use aboard NASA, Department of Defense, commercial, and international space applications, including: Deep Impact, MESSENGER, Cassini, NEAR, GLAST, EOS, Geolite, Aura, Aqua, KOMPSAT 1, GOES, 601-HP, TDRS, GPM, WGS, 702 bus, EchoStar, IKONOS, AEHF, A2100 bus, 1300 bus, STAR bus, MUOS, SBSS, Worldview, Herschel, GeoEye, TerreStar, and Landsat.
Download the datasheet for more informatio about the Scalable SIRU™