Online calibration method for north-seeking rotation on basis of triaxial MEMS (Micro-Electromechanical System) gyroscope

Abstract

The invention relates to an online calibration method for north-seeking rotation on the basis of a triaxial MEMS (Micro-Electromechanical System) gyroscope. The online calibration method comprises the following steps of: on a rotary control system, carrying out 'online' rotation control on an attitude instrument integrated with the triaxial MEMS gyroscope, measuring the attitude of the attitude instrument in real time by carrying out installation error calibration, filtering processing and temperature compensation on the triaxial MEMS gyroscope, outputting a course angle when the rolling angle and pitching angle of the attitude instrument are zero, applying a transformation matrix between a carrier coordinate system and a navigation coordinate system to carry out transformation, and after consideration for the local magnetic declination, finally obtaining a north-seeking value. The online calibration method adopts the MEMS gyroscope, is low in cost, high in north-seeking speed, high in accuracy and simple in calculation principle and is applicable to underground north seeking with high requirements.

Description

technical field [0001] The invention belongs to an online calibration method for north-seeking rotation of a three-axis MEMS gyroscope, in particular to a north-seeking method in a north-seeking system. Background technique [0002] In people's production and life, the determination of the orientation is essential, and the positioning technology is constantly being developed. However, the traditional positioning technology has poor environmental adaptability and low precision, and can no longer meet the needs of rapid development of life. With the rapid development of modern science and technology, the requirements for north-seeking technology in fields such as well logging, exploration, navigation and aviation are getting higher and higher. Inertial technology is a comprehensive technology integrating classical mechanics and physics, which can control the trajectory and motion attitude. Its appearance promotes the development of the north-seeking system in the direction of ...

AI Technical Summary

Problems solved by technology

Literature [1] proposed that the conventional method of well logging is to use geomagnetic measurement technology, which is easily disturbed by the external magnetic field, and the abnormal geological conditions and even special astronomical phenomena of the magnetic field will lead to a decrease in the measurement accuracy of the instrument

Literature [2] proposed a north-finder for a strapdown inertial navigation system, which is often selected as the core gyroscope. The gyroscope itself is not high in accuracy, small in size, and low in cost. Simple structure, short north-seeking time, but low accuracy

Images