North finder can provide accurate heading information for the carrier, and plays an important role in many fields such as national defense, military, civil and so on. Strapdown north finder mainly uses optical gyroscope as its key component, the basic principle is to make the gyroscope sensitive axis measure the horizontal component of the earth angular rate (ground speed) in different directions, and independently determine the course Angle of the attached carrier relative to the geographical true north, without interference and influence from the external magnetic field or other environment. It can also be combined with the accelerometer for horizontal attitude measurement and compensation.

The accuracy of the north finder is mainly limited by the drift noise of the inertial element, which mainly includes constant drift and random drift. How to suppress the measurement error becomes the focus of the research of the north finder. The traditional scheme is to adjust the north finder on the horizontal plane, adopt the static multi-position measurement method, and use the symmetrical position to offset the influence of the inertial element constant drift on the system accuracy, so as to determine the heading Angle of the carrier, but the north finding accuracy of this method is easily limited by the measurement number and sampling time. Starting with the output models of gyroscope and accelerometer under the rotating condition of static base, this paper designs a fast north finding scheme based on orthogonal detection technology, which can effectively suppress the constant drift and random drift of inertial elements, improve the north finding accuracy in a short time, and output horizontal attitude information with a certain precision. And the whole process of north finding does not need to rotate the platform to adjust on the horizontal plane, which is convenient for practical engineering applications.

The full article: https://www.ericcointernational.com/application/research-on-orthogonal-monitoring-technology-of-north-finder.html
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