Integrated Fiber Optic North Finder for Inertial Navigation and Attitude Reference

Engineered for defense, surveying, and autonomous navigation, the Fiber Optic Gyroscope North Finder provides rapid, high-accuracy true-north determination. The system derives the Earth’s rotation angular rate using an advanced FOG sensor, ensuring excellent azimuth accuracy and stability.
With a compact structure (115 × 90 × 110 mm) integrating a gyroscope, accelerometer, rotation control unit, and embedded computer, it offers ≤3 min alignment and ≤0.3° accuracy.
Its rugged design withstands -40 °C to +70 °C, operates on DC 12–24 V, and delivers data through RS-422. Suitable for geodesy, mapping, and tactical navigation, this north finder is optimized for precision performance in demanding field conditions.

Overall dimensions

Dimension (mm): 115 × 90 × 110

1.2 Main technical indicators

A) North seeking time: ≤ 3 min;

B) North seeking accuracy (1σ): ≤ 0.3 ° (NF701A); ≤ 0.5 ° (NF701B)

C) Horizontal accuracy: ≤ 0.05 ° (1σ);

D) Circumference: ≤ 0.5 ° (1σ)

E) Weight: ≤ 2 kg;

F) Power supply: DC 12V ~ 24V;

G) Power consumption: 15 W (peak);

H) Interface: RS422

I) Working mode: start automatic self-check after power on, control north seeking by the upper computer, and send north seeking results to the upper computer after north seeking is completed;

1.3 Environmental requirements

1) Working temperature: -40 ℃ ~ + 70 ℃;

2) Storage temperature: -55 ℃ ~ + 85 ℃.

3) Humid and hot environmental conditions: relative humidity is less than 95%.

4) Appearance: The metal surface shall be free of rust, and the coating shall be free of blistering, peeling, etc.

1.4 Electrical performance

Insulation resistance: the insulation resistance between the independent circuits of the fiber optic gyroscope north finder and between the circuit and the shell shall not be less than 10 MΩ under standard atmospheric conditions.

1.5 Reliability and maintainability

MTBF ≥ 1000 hours;

MTTR ≤30min.

1.6 External interface

1.6.1 With DC12 V ~ 24V power input.

1.6.2 With serial port output function.

1.8.3 External plug:

Interface Y50EX-0607TX2, see the table below for pin definition.

fiber optic north finder

inertial navigation sensor

attitude reference gyro sensor

Integrated Fiber Optic North Finder for Inertial Navigation and Attitude Reference Images