Gyroscopic north seekers have been widely used in mobile weapon orientation, oil drilling and other fields. The following will introduce the relevant knowledge of north seekers from the concept, principle, classification and application fields of north seekers.

The Concept of North Seeker

A north seeker is a type of compass. It is a precision inertial measurement instrument used to find the true north value of a certain location. It is usually used to provide azimuth reference for mobile weapon systems such as artillery, surface-to-surface missiles, and ground radars. . At the same time, the north seeker is also an inertial measurement system that uses the gyro principle to determine the projection direction of the earth’s rotation angular rate in the local horizontal plane (i.e., the true north position).

Basic Principles of Gyro North Seeker

The Earth rotates around its axis at a constant angular velocity. For a point on the earth with latitude φ, the angular velocity of the earth’s rotation at that point can be decomposed into two components, the horizontal component (formula: ωe1=ωecos&phipointing to true north along the earth’s longitude, and the vertical component (formula: ωe2=ωesin&phiVertically upward along the earth’s vertical line, as shown in Figure 1, the north direction information of the measured point on the earth can be obtained by measuring the horizontal component of the earth’s rotation angular velocity using inertial technology or being sensitive to it. This is the core principle of gyro north-finding technology.

 Figure 1  Ground speed component

Its north-seeking process does not require an external reference. In addition to being limited by high latitude, its north-seeking measurement is not affected by weather, day and night time, geomagnetic field and site visibility conditions. North seekers are extremely sensitive to environmental vibration interference (especially low-frequency vibration interference).

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