A fiber-optic attitude and heading reference system (AHRS) (gyro bias repeatability ≤30μg) with fast startup, RS-422/Ethernet output and extended-temperature operation, suited to demanding navigation and stabilization applications.
The Merak-H1(98S) Fiber Optic AHRS is a fiber-optic attitude and heading reference system (AHRS) from the Merak civil AHRS series. It combines a high-precision fiber optic gyroscope triad with quartz flexible accelerometers in a strapdown architecture, and outputs attitude, heading and inertial data over serial and Ethernet interfaces. The unit delivers a dynamic range of at least ±400°/s with excellent bias stability and low angular random walk. Key performance figures include Accelerometer Bias Repeatability (monthly, 1σ) ≤30μg; Accelerometer Scale Factor Accuracy (monthly, 1σ) ≤30ppm; Gyro Bias Repeatability (1σ) ≤0.005°/hr; Gyro Scale Factor Accuracy (1σ) ≤20ppm; Gyro Accuracy (10 s, 1σ) ≤0.01°/hr; Angular Random Walk (1σ) ≤0.001°/√hr. A companion “Deep Pilot” variant (SD-GZ1) with the same specifications is also available. Electrical interfacing is provided through high-speed serial or Ethernet links with fast startup, and the unit operates over an extended industrial temperature range with high MTBF for long-endurance missions. Typical applications include guns, lasers, sonars, cannons and other military equipment platforms, as well as unmanned surface vessels and industrial attitude-measurement systems that require a continuous, GPS-independent attitude reference. All specifications below are taken directly from the manufacturer’s 2026 catalog and datasheet.
Key specifications: Accelerometer Bias Repeatability (monthly, 1σ): ≤30μg; Accelerometer Scale Factor Accuracy (monthly, 1σ): ≤30ppm; Gyro Bias Repeatability (1σ): ≤0.005°/hr; Gyro Scale Factor Accuracy (1σ): ≤20ppm; Gyro Accuracy (10 s, 1σ): ≤0.01°/hr; Angular Random Walk (1σ): ≤0.001°/√hr.
Specifications
| Parameter | Value | Unit |
|---|---|---|
| Accelerometer Bias Repeatability (monthly, 1σ) | ≤30μg | |
| Accelerometer Scale Factor Accuracy (monthly, 1σ) | ≤30ppm | |
| Gyro Bias Repeatability (1σ) | ≤0.005°/hr | |
| Gyro Scale Factor Accuracy (1σ) | ≤20ppm | |
| Gyro Accuracy (10 s, 1σ) | ≤0.01°/hr | |
| Angular Random Walk (1σ) | ≤0.001°/√hr | |
| Angular Rate Range | ≥±400°/sec | |
| Angular Acceleration | 100000°/s² | |
| Acceleration Range | ≥25g | |
| Attitude | Any Orientation | |
| Startup Time | 10 sec | |
| Input/Output Interface | 3 RS422 full-duplex serial ports, 1 100M Ethernet port | |
| Alignment Time | ≤10min | |
| Heading Accuracy (Pure Inertial) | ≤0.05°secL+0.01°/h,RMS | |
| ins/single-antenna gnss combination | ≤0.02°,RMS | |
| Heading Accuracy (INS/Dual-Antenna GNSS-aided) | ≤0.02°,RMS | |
| Pitch & Roll Accuracy (Pure Inertial) | ≤0.02°,RMS | |
| Pitch & Roll Accuracy (INS/GNSS-aided) | ≤0.01°,RMS | |
| Power Consumption | ≤15W | |
| Dimensions (L×W×H, mm) | 188×188×124 | |
| Weight | ≤4.5kg | |
| Operating Temperature | -40°C~60°C | |
| Shock | 15g, Half-sine wave 11ms | |
| Input Voltage | DC24V(±25%) | |
| Cooling | Conduction to mounting plate | |
| Vibration | 20~2000Hz,6.06g | |
| MTBF | ≥20000 hours |
All specifications are taken from the manufacturer’s current datasheet.
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