A high-precision three-axis split (discrete) fiber optic gyroscope (DFOG) (gyro bias repeatability ≤1°/hr) with fast startup, RS-422/Ethernet output and extended-temperature operation, suited to demanding navigation and stabilization applications.
The Merak-G98ST Three-Axis Split Fiber Optic Gyroscope belongs to the Merak series of discrete (split-type) fiber optic gyroscopes (DFOG), in which the fiber-optic sensing unit and the electronics are separated in a flat, three-axis orthogonal package. It is an angular-rate sensor based on the Sagnac effect, providing high-precision three-axis rate measurements in a compact form factor. The unit delivers a dynamic range of at least ±400°/s with excellent bias stability and low angular random walk. Key performance figures include Dynamic Range ≥±400°/s; Bias In-Run Stability ≤1°/hr; Accuracy (100 s, 1σ) ≤0.004°/hr; Angular Random Walk (1σ) ≤0.001°/√hr. A companion “Deep Pilot” variant (SD-GT98ST) 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 guidance weapons, attitude control, torpedoes, tactical missiles, unmanned platforms and other navigation and stabilization systems that require a thin, split-type gyroscope package. All specifications below are taken directly from the manufacturer’s 2026 catalog and datasheet.
Key specifications: Dynamic Range: ≥±400°/s; Bias In-Run Stability: ≤1°/hr; Accuracy (100 s, 1σ): ≤0.004°/hr; Angular Random Walk (1σ): ≤0.001°/√hr; Vibration Screening: 20~500Hz, 5.3g; Bandwidth: ≥200Hz.
Specifications
| Parameter | Value | Unit |
|---|---|---|
| Dynamic Range | ≥±400°/s | |
| Bias In-Run Stability | ≤1°/hr | |
| Accuracy (100 s, 1σ) | ≤0.004°/hr | |
| Angular Random Walk (1σ) | ≤0.001°/√hr | |
| Vibration Screening | 20~500Hz, 5.3g | |
| Bandwidth | ≥200Hz | |
| Turn-On Time | 30s | |
| Output Signal Format | RS-422 | |
| Built-In Self-Test | — | |
| Output Update Rate | 500Hz~4000Hz | |
| Output Baud Rate | 115200bps~921600bps | |
| Operating Temperature | – 40°C ~ + 70°C | |
| Storage Temperature | – 55°C ~ + 85°C | |
| Power Supply | 5V | |
| Connector | J30JZ/XN9TJCAL01 | |
| Power Consumption | ≤3w | |
| MTBF (per MIL-HDBK-217-F) | ≥150000hr | |
| Weight | ≤560g | |
| Dimensions | 98mm×98mm×35mm |
All specifications are taken from the manufacturer’s current datasheet.
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