Abstract
The article analyzes methods and techniques of autonomous latitude determination. Kinematic schemes for georeferencing inertial modules in the geographic coordinate system are discussed, which are used for the analytical and semi-analytical methods of autonomous latitude determination. Analytical expressions are provided for the discussed methods of latitude determination using six-component (three accelerometers and three gyroscopes) and single-component (one gyroscope) inertial measurement unit. It is shown that the astronomical latitude is determined by the examined methods and techniques. Theoretical and practical models of the Earth are considered, including the sphere, ellipsoid of rotation, and geoid. The issue of determining analytical relationships between astronomical and geodetic latitudes is addressed. Approximate analytical expressions relating the determined astronomical latitude to the geodetic latitude in the World Geodetic System 1984 (WGS84) coordinate system are presented.
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