Product Overview
The Merak-H1(98S) is the flagship fiber optic AHRS with 0.01°/hr gyro accuracy, providing 0.02° RMS heading from a single GNSS antenna and 0.01° RMS pitch and roll with GNSS. Its navigation-grade sensing core maintains accuracy through long GNSS-denied periods. The 188×188×124 mm, 4.5 kg enclosure suits high-end airborne and naval attitude reference applications.
Key Features
- Gyro bias repeatability of ≤0.005°/hr and accuracy of ≤0.01°/hr (10 s, 1σ)
- Heading accuracy ≤0.05°·secL+0.01°/h RMS pure inertial and ≤0.02° RMS RMS with dual-antenna GNSS
- Pitch & roll accuracy of ≤0.02° RMS RMS pure inertial and ≤0.01° RMS RMS with INS/GNSS fusion
- Angular rate ≥±400°/s, angular acceleration 100,000°/s² and any-orientation startup
- 3 × RS-422 full-duplex serial ports plus 1 × 100 M Ethernet port
- Dimensions 188×188×124 mm, weight ≤4.5 kg, MTBF ≥20,000 hours
Technical Specifications
| Parameter | Specification |
|---|---|
| Accelerometer bias repeatability (1σ, months) | ≤30 μg |
| Accelerometer scale factor accuracy (1σ, months) | ≤30 ppm |
| Gyro bias repeatability (1σ) | ≤0.005°/hr |
| Gyro scale factor accuracy (1σ) | ≤20 ppm |
| Gyro accuracy (10 s, 1σ) | ≤0.01°/hr |
| Angular random walk (1σ) | ≤0.001°/√hr |
| Angular rate | ≥ ±400°/s |
| Angular acceleration | 100,000°/s² |
| Acceleration | ≥ 25 g |
| Attitude | Any orientation |
| Startup time | 10 s |
| Alignment time | ≤ 10 min |
| Interfaces | 3 × RS-422 full-duplex, 1 × 100 M Ethernet |
| Heading accuracy (pure inertial) | ≤0.05°·secL+0.01°/h RMS |
| Heading accuracy (INS/GNSS, single antenna) | ≤0.02° RMS |
| Heading accuracy (INS/GNSS, dual antenna) | ≤0.02° RMS |
| Pitch & roll accuracy (pure inertial) | ≤0.02° RMS |
| Pitch & roll accuracy (INS/GNSS) | ≤0.01° RMS |
| Power consumption | ≤15 W |
| Dimensions (L×W×H) | 188×188×124 mm |
| Weight | ≤4.5 kg |
| Operating temperature | -40℃ – +60℃ |
| Shock | 15 g half-sine, 11 ms |
| Supply voltage | DC 24 V ±25% |
| Cooling | Conduction to mounting plate |
| Vibration | 20–2000 Hz, 6.06 g |
| MTBF | ≥ 20,000 hours |
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