A marine strapdown inertial navigation system (SINS) (gyro bias repeatability ≤50μg) with fast startup, RS-422/Ethernet output and extended-temperature operation, suited to demanding navigation and stabilization applications.
The Merak-M03 (60S) Strapdown Inertial Navigation System (SINS-M) is a marine strapdown inertial navigation system (SINS-M) from the Merak series. It integrates a fiber-optic gyroscope triad with quartz flexible accelerometers in a strapdown architecture, supports any-orientation startup, and outputs position, velocity and attitude through 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) ≤50μg; Accelerometer Scale Factor Accuracy (monthly, 1σ) ≤50ppm; Gyro Bias Repeatability (1σ) ≤0.05°/hr; Gyro Scale Factor Accuracy (1σ) ≤50ppm; Gyro Accuracy (10 s, 1σ) ≤0.1°/hr; Angular Random Walk (1σ) ≤0.01°/√hr. A companion “Deep Pilot” variant (SD-GH03) 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 small and medium-sized unmanned surface vessels, unmanned submersibles, underwater vehicles and other marine platforms that require rapid alignment while moored or during constant-speed straight-line navigation. All specifications below are taken directly from the manufacturer’s 2026 catalog and datasheet.
Key specifications: Accelerometer Bias Repeatability (monthly, 1σ): ≤50μg; Accelerometer Scale Factor Accuracy (monthly, 1σ): ≤50ppm; Gyro Bias Repeatability (1σ): ≤0.05°/hr; Gyro Scale Factor Accuracy (1σ): ≤50ppm; Gyro Accuracy (10 s, 1σ): ≤0.1°/hr; Angular Random Walk (1σ): ≤0.01°/√hr.
Specifications
| Parameter | Value | Unit |
|---|---|---|
| Accelerometer Bias Repeatability (monthly, 1σ) | ≤50μg | |
| Accelerometer Scale Factor Accuracy (monthly, 1σ) | ≤50ppm | |
| Gyro Bias Repeatability (1σ) | ≤0.05°/hr | |
| Gyro Scale Factor Accuracy (1σ) | ≤50ppm | |
| Gyro Accuracy (10 s, 1σ) | ≤0.1°/hr | |
| Angular Random Walk (1σ) | ≤0.01°/√hr | |
| Angular Rate Range | ≥±400°/sec | |
| Angular Acceleration | 100000°/s² | |
| Acceleration Range | ≥25g | |
| Velocity Accuracy (Pure Inertial) | ≤3.0kn,RMS | |
| Velocity Accuracy (INS/GNSS-aided) | ≤0.4kn,RMS | |
| Attitude | Any Orientation | |
| Startup Time | ≤10 sec | |
| Input/Output Interface | 3 RS422 full-duplex serial ports, 1 100M Ethernet port | |
| Alignment Time | ≤15min | |
| Position Accuracy (Pure Inertial) | ≤4nm/1h,CEP | |
| Position Accuracy (INS/DVL-aided) | ≤0.6%D,RMS | |
| Position Accuracy (INS/GNSS-aided) | better than satellite accuracy | |
| Heading Accuracy (Pure Inertial) | ≤0.5°sec(L),RMS | |
| Heading Accuracy (INS/GNSS-aided) | ≤0.1°,RMS | |
| Pitch & Roll Accuracy (Pure Inertial) | ≤0.05°,RMS | |
| Pitch & Roll Accuracy (INS/GNSS-aided) | ≤0.02°,RMS | |
| Power Consumption | ≤15W | |
| Dimensions (L×W×H, mm) | 110×110×100 | |
| Weight | ≤1.7kg | |
| 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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