High Precision Fiber Optic North Finder for Accurate True North Determination

The Fiber Optic Gyroscope (FOG) North Finder is a high-precision instrument designed for rapid, autonomous determination of true north. By detecting the Earth's rotation angular rate through a FOG and resolving it into directional components, the system accurately calculates the azimuth between the gyroscope's main axis and geographic north.

This compact electromechanical system integrates a fiber optic gyroscope, accelerometer, rotation control mechanism, and embedded computer. With a north-seeking time of ≤3 minutes and accuracy up to 0.3° (1σ), it delivers reliable azimuth and attitude information for vehicles, ships, and other mobile platforms.

Operating in temperatures from -40°C to +70°C, powered by DC 12-24V, and communicating via RS-422, the lightweight (≤2 kg) FOG North Finder features fast startup, automatic self-test, and robust performance in harsh environments.

115 × 90 × 110 mm

• North seeking time: ≤ 3 minutes
• North seeking accuracy (1σ): ≤ 0.3° (NF701A); ≤ 0.5° (NF701B)
• Horizontal accuracy: ≤ 0.05° (1σ)
• Circumference: ≤ 0.5° (1σ)
• Weight: ≤ 2 kg
• Power supply: DC 12V ~ 24V
• Power consumption: 15 W (peak)
• Interface: RS422
• Working mode: Automatic self-check on power-up, controlled north seeking via upper computer, with results transmitted upon completion

• Operating temperature: -40°C to +70°C
• Storage temperature: -55°C to +85°C
• Humidity: Relative humidity less than 95%
• Appearance: Metal surfaces free of rust, coatings without blistering or peeling

Insulation resistance: ≥10 MΩ between independent circuits and between circuits and housing under standard atmospheric conditions.

• MTBF ≥ 1000 hours
• MTTR ≤30 minutes

• DC12V ~ 24V power input
• Serial port output function