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HONEYWELL AEROSPACE
Inertial Measurement Unit (SIGI)
Navigation SystemIntegrated GPS/INS● Active
MASS
7.7 kg
POWER
45 W
REDUNDANCY
Dual SIGI units on most vehicles
RAD HARDENED
Yes
FIRST USE
Jan 2002
Inertial Measurement Unit (SIGI) is a navigation system system manufactured by Honeywell Aerospace. It features dual sigi units on most vehicles redundancy. Radiation hardened for space environments.
ABOUT INERTIAL MEASUREMENT UNIT (SIGI)
The Space Integrated GPS/INS (SIGI) is a combined inertial navigation and GPS receiver unit developed by Honeywell for space launch applications. It blends ring laser gyro IMU data with GPS fixes for optimal navigation accuracy throughout flight. SIGI has been baseline navigation for Atlas, Delta, and other US launch vehicles.
OPERATING PRINCIPLE
Ring laser gyro INS tightly coupled with embedded GPS receiver; Kalman filter blends inertial and satellite navigation
VEHICLES USING THIS SYSTEM
Atlas VDelta IVVulcanSLS
SPECIFICATIONS
| CATEGORY | Navigation System |
| TYPE | Integrated GPS/INS |
| MANUFACTURER | Honeywell Aerospace |
| MASS | 7.7 kg |
| POWER CONSUMPTION | 45 W |
| REDUNDANCY | Dual SIGI units on most vehicles |
| RADIATION HARDENED | Yes |
| ACCURACY | < 5 m position (GPS-aided) |
| FIRST USE | January 1, 2002 |
| STATUS | Active |
DETAILED SPECS
| GYRO_TYPE | Ring Laser |
| GPS_CHANNELS | 12 |
| NAVIGATION_MODE | Tightly coupled GPS/INS |
| KALMAN_FILTER | Yes |
