Overview
KASSAV 1 (Kit Autonome de Sécurité pour la SAuvergarde en Vol) is an inertial navigation system (INS) dedicated to launchers and used in Ariane 5 since 2020. It has been developed by iXblue in partnership with Safran Data Systems based on iXblue Fiber-Optic Gyroscope (FOG) technology.
One of the key element of this INS is its ability to resist vibrations and shock while maintaining performance during take-off and jettisoning . In addition, it withstands vacuum and important temperature variations. KASSAV 1 project demonstrates how robust the FOG technology is
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Specifications
Main features
- 3 accelerometers, 3 fiber optic gyroscopes, 1 GNSS receiver
- Dedicated algorithm to hybridize all the sensors and to offer reliable and precise position during take-off
- Full performances under vibrations (27grms random and 20g sin), shocks, in vacuum and at very high speeds (up to 10 000 m/s)
- Already in use in Ariane 5
Main performance
| KASSAV 1 | |
| PERFORMANCES | |
| FOG ARW | 0.03 °/√h |
| FOG bias stability at 12 months @ 3s | 0.1°/h |
| FOG scale factor at 12 months @ 3s | 300 ppm |
| Accelerometer bias at 12 months | 0.001 g peak |
| Accelerometer scale factor at 12 months | 300 ppm peak |
| Accelerometer range | ± 50g |
| GNSS | Galileo. GPS. Glonass. BeiDou… |
| Position precision (for all environments and speeds) | below 20 m |
| Alignement duration static | below 30 minutes |
| Bandwidth | up to 100 Hz |
| ENVIRONMENT | |
| Temperature (full performances) | '0°C to 50°C |
| Vibration (full performances) | 22g sin and 27 g rms random |
| Shock (full performances) | Up to 5 000 g up to 25 kHz |
| Vacuum (full performances) | withstands space vacuum |
| MECHANICAL INTERFACE | |
| Mass | 3.85 kg |
| Volume | HLW = 157 mm x 334 mm x 184 mm |
| ELECTRICAL INTERFACE | |
| Power bus | 20 V to 34 V |
| Communication |
RS 232 and RS422 |
| Power | 18 W |