Application of MEMS accelerometer in north finder The
high-precision north finder is a high-precision dual-axis power tuned gyroscope that determines the true north direction value of the attached carrier by measuring the earth's rotation angular velocity, independent of external magnetic fields or other environments In addition, it can also be combined with acceleration to measure and correct horizontal angle. It is mainly used in drilling directional instruments, drilling equipment control and measurement, marine surveying, 3D scanners, radar, antennas, military vehicles and other fields.
It is mainly used to quickly and autonomously determine the true north direction. After obtaining the azimuth angle, the device starts to move, and can continuously output the changed dynamic inclination angle and azimuth angle. MEMS gyroscope is used for north seeking. The built-in IMU is used for inclination measurement and azimuth estimation. It has the characteristics of small size, low price, low power consumption, long life and high reliability.
MEMS gyroscope, accelerometer, mechanical rotating device and signal calculation circuit, the miniature gyroscope north finder uses the rate gyroscope to measure the earth's rotation angular velocity, thereby calculating the azimuth angle, and the product collects the output of the gyroscope under different azimuth angles and performs Signal processing calculates the azimuth of the device.
The IMU's inertial measurement unit is an important component, and the internal MEMS
accelerometer is one of the components of the IMU's inertial measurement unit, which is mainly used as the acceleration of the X \ Y \ Z axis in three directions to match the gyro And calculate the correct angle required by the north finder.
Dynamic Gyro North Seeker is a gyroscope that uses strapdown compass effect to solve true north.
The dynamic gyro north-finder is composed of three-axis dynamic gyro, three-axis adding table, data acquisition and processing module, secondary power supply, optocoupler isolated input and output serial port circuit and other related structural parts. After the power is turned on, the product enters the preheating time. After the preheating time, the product turns into the initial self-alignment under the condition of the moving base. 30 minutes after the north finder is energized, the body carrying the product can sail at sea.
The dynamic gyro north seeker is mainly used in the navigation business. During navigation, the dynamic gyro north seeker will output the heading angle, roll angle and pitch angle in time.
The performance indicators of dynamic gyro north finder: measurement accuracy, measurement range, preparation time, external input signal and error, etc.
