Product Overview
The Merak-H04(70SR2) is a high-accuracy FOG-based AHRS delivering 0.05° RMS heading with GNSS aiding and 0.04° RMS pure-inertial pitch and roll. Gyro bias repeatability of 0.02°/hr supports accurate attitude holding through GNSS outages. The 130×130×110 mm, 2.2 kg unit is conduction-cooled for embedded installation on air, land and sea platforms.
Key Features
- Gyro bias repeatability of ≤0.02°/hr and accuracy of ≤0.05°/hr (10 s, 1σ)
- Heading accuracy ≤0.3°·secL+0.05°/h RMS pure inertial and ≤0.05° RMS RMS with dual-antenna GNSS
- Pitch & roll accuracy of ≤0.04° RMS RMS pure inertial and ≤0.02° 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 130×130×110 mm, weight ≤2.2 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) | ≤0.02°/hr |
| Gyro scale factor accuracy (1σ) | ≤30 ppm |
| Gyro accuracy (10 s, 1σ) | ≤0.05°/hr |
| Angular random walk (1σ) | ≤0.005°/√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) | ≤0.3°·secL+0.05°/h RMS |
| Heading accuracy (INS/GNSS, single antenna) | ≤0.05° RMS |
| Heading accuracy (INS/GNSS, dual antenna) | ≤0.05° RMS |
| Pitch & roll accuracy (pure inertial) | ≤0.04° RMS |
| Pitch & roll accuracy (INS/GNSS) | ≤0.02° RMS |
| Power consumption | ≤15 W |
| Dimensions (L×W×H) | 130×130×110 mm |
| Weight | ≤2.2 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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