The north-seeking methods of MEMS gyroscopes can be divided into two-position north-seeking, four-position north-seeking, multi-position north-seeking and continuous rotation dynamic north-seeking.
The second position north seeking refers to placing the attitude instrument on a mechanical turntable, controlling the attitude instrument to be in two positions 180º apart through the turntable, and collecting the values of the gyro-sensitive earth angular rate component respectively. The gyro output of two positions 180º apart can offset the long-value drift through a solution method, and the time interval between the two positions should be controlled within a short period of time.
Four-position north seeking means to control the attitude instrument by rotating the turntable on the basis of two-position north seeking at four positions that are 90º apart, and collect the values of the gyro-sensitive earth angular rate components respectively. After collecting one position, move to the next position. The time should be as short as possible.
Multi-position north seeking is a north seeking solution that collects gyroscope output from multiple positions separated by angles while the gyroscope rotates 360º on the basis of two-position and four-position north seeking. Because more locations are collected, the accuracy of the gyroscope’s sensitivity to the earth’s rotation rate becomes correspondingly higher, and the north-finding accuracy is also higher.
Continuous rotation dynamic north seeking refers to placing the gyroscope on a precision turntable and driving the sensitive axis of the gyroscope to rotate at a constant speed. The rate of rotation is artificially controlled through the turntable. At the same time, the output of MEMS gyro during rotation is collected to calculate the northward angle. Compared with static north seeking, continuous rotation is less affected by noise and constant drift, and can achieve higher-precision north seeking in a shorter time.
Based on the working principle and north-seeking principle of MEMS gyroscopes, Ericco has developed a specialized north-seeking MEMS gyroscope ER-MG2-50/100 (https://www.ericcointernational.com/gyroscope/mems-gyroscope/er-mg2-100-north-seeking-mems-gyro.html). It can be used for pointing, steering and guidance in mining/drilling equipment, precision attitude and position measurement in navigation-grade MEMS IMU/INS, north-seeking positioning in geodetic/land mobile mapping systems, oil exploration, etc. Its accuracy level can reach 0.01-0.02°/hr bias instability and 0.0025-0.005°/√hr angular random walk.

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