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As an inertial system, north finder has its own characteristics, it is not affected by weather, magnetic interference and other external interference, so it has been widely used in both military and civilian applications. Sensors based on inertial technology are considered to be the most robust and reliable north finding method, traditional gyro north finder mostly uses high-precision gyroscopes, such as mechanical gyroscopes, ring laser gyroscopes, fiber optic gyroscopes, etc., they can achieve high precision, however, most of them are very heavy, high power consumption, large volume, relatively expensive. Their high cost, large size and high power consumption limit their application in areas such as individual navigation. The current gyro north finder usually uses an inertial measurement unit (gyro and accelerometer), on the basis of which a north finding algorithm is added to find the north.

The ability to seek true north accuracy is critical to determining the direction of ground vehicles, sea and air. The theodolite is primarily used in measurement applications for measuring angles, however, point-by-point transmission from outside to inside through the theodolite requires many experts and is a complex process. In this paper, we propose a high-precision and compact north finder based on microelectromechanical system (MEMS) gyroscope and accelerometer sensors for batch direction marking.

In modern society, electronic compasses and GPS technology are the most popular choices, often used in navigation applications. But use has shown that electronic compasses and GPS-based technology are not suitable for permanent directional marking. In addition, electromagnetic interference and iron-containing materials can reduce the heading accuracy of a digital compass. At the same time, GPS signals are susceptible to interference in geographical locations, complex landscapes, and harsh weather conditions. It is safe to say that electronic compass and GPS technology cannot be used if the goal is to find and mark accurate directions in different geographical situations.

1.The product advantages of MEMS north finder
Compared with traditional gyroscopes, MEMS gyroscopes have the advantages of low cost, small size, low power consumption, and high robustness. It does not use rotating parts of bearings, so miniaturization can adapt to small PCB.The MEMS gyroscopes use the Coriolis force effect on vibrating mechanical components to detect the speed of the earth's angular rotation. MEMS north finder can provide accurate readings that can be applied in the automotive, industrial, medical, and mobile device industries. As MEMS north seeker technology gradually moves toward commercialization, production costs are expected to decrease further.

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