What is the System Structure of FOG North Finder

1.Application Products

ER-FNS-03 Low Cost 3 Axis FOG North Seeker

2. System Introduction

The triaxial integrated FOG strapdown north finder based on an interference-type closed-loop fiber optic gyro, has a series of advantages such as high accuracy, low power consumption, high reliability, no noise, and low speed / angular velocity information noise. It does not require the assistance of a magnetic sensor, and can not only provides high-quality heading and attitude information to the carrier, but also has a short-term inertial navigation function.

With the current reduction in the cost of optical and electronic components, the fiber optic gyro strapdown north finder is transforming from the military market to the civilian market, and has great market application prospects in the coal and petroleum resource mining industries.

3. System Indicators

3.1 General Indicators

a) Start-up time (from power-on to data output): <5 seconds;

b) North seeking time (from system startup to precision output): ≤ 5 minutes;

c) System weight ≤ 2kg;

d) System size: 210 × 125 × 104.5mm,or 200×100×90mm

e) Communication interface: RS422 serial port;

f) Data refresh frequency: 400HZ;

g) Working temperature: -10 ℃ ～ + 60 ℃;

h) Storage temperature: -20 ° C to + 70 ° C.

3.2 Accuracy Indicators

a) North seeking method: static base;

b) North seeking time: 5min;

c) Azimuth measurement range: 0 ° ~ 360 °;

d) Measuring range of tilt angle: -65 ° ~ 65 °;

e) Azimuth measurement accuracy (1σ): ≤ 0.5 °-1 °;

f) Azimuth holding time: 20min.

4.System Composition

The triaxial integrated optical fiber compass is composed of a system body, a triaxial integrated optical fiber gyro component, a triaxial quartz accelerometer component, a secondary power source, and a navigation solution component. The system composition diagram is shown below:

ER-FNS-03 system composition diagram

Among them, the triaxial integrated fiber optic gyro component has packaged the light source, detector, coupler, waveguide, fiber ring and gyro signal processing circuit together to form an independent transceiver module for measuring the angular velocity signal of the carrier's sensitive inertial space; the triaxial accelerometer The component has packaged the quartz flexible accelerometer and the meter-adding signal processing circuit together to form an independent transceiver component for measuring the specific force signal of the carrier; the navigation solution component will mainly receive the gyro and accelerometer signals to complete the north seeking and attitude maintenance And other functional calculations, and at the same time send the solution data to the user through an external plug-in; the secondary power supply module converts the externally input + 12V into different voltages required by the gyro component, accelerometer component and navigation solution component to make it normal jobs.