← ALL AVIONICS
NORTHROP GRUMMAN
Hemispherical Resonator Gyro (HRG)
Inertial SensorVibrating Structure Gyroscope● Active
MASS
0.5 kg
POWER
5 W
REDUNDANCY
Typically triaxial
RAD HARDENED
Yes
FIRST USE
Jan 1996
Hemispherical Resonator Gyro (HRG) is a inertial sensor system manufactured by Northrop Grumman. It features typically triaxial redundancy. Radiation hardened for space environments.
ABOUT HEMISPHERICAL RESONATOR GYRO (HRG)
The Hemispherical Resonator Gyro uses the precession of a vibrating quartz hemisphere to measure angular rotation. It offers exceptional longevity with no moving parts and has demonstrated over 50 million hours of operation on orbit. The HRG is used on many long-duration satellite missions.
OPERATING PRINCIPLE
A fused-quartz hemisphere vibrates in a standing-wave pattern; rotation causes precession of the wave detected by capacitive pickoffs
VEHICLES USING THIS SYSTEM
Hubble Space Telescope (replacement)GOESVarious GEO satellites
SPECIFICATIONS
| CATEGORY | Inertial Sensor |
| TYPE | Vibrating Structure Gyroscope |
| MANUFACTURER | Northrop Grumman |
| MASS | 0.5 kg |
| POWER CONSUMPTION | 5 W |
| REDUNDANCY | Typically triaxial |
| RADIATION HARDENED | Yes |
| ACCURACY | 0.001 deg/hr |
| FIRST USE | January 1, 1996 |
| STATUS | Active |
DETAILED SPECS
| BIAS_STABILITY | 0.001 deg/hr |
| LIFETIME_YEARS | 20+ |
| VIBRATING_ELEMENT | Fused quartz |
| MAINTENANCE | None |
