A Method of Determining Geographical Latitude Using Fiber Optic Gyroscope

Abstract

The invention provides a method for measuring geographic latitude by a fiber-optic gyroscope. The method is used for measuring the geographic latitude by the fiber-optic gyroscope provided with three-axis orthogonal fiber-optic gyroscopes. The method specifically comprises the steps of placing the instrument, inputting initial conditions, measuring angular rates by using the three-axis orthogonal fiber-optic gyroscopes, and calculating the earth geographic latitude; according to the formula described in the specification, calculating the latitude value component phi<X> measured by the fiber-optic gyroscope X at a measurement station, and calculating corresponding latitude value components phi<Y> and phi<Z> measured by the fiber-optic gyroscope Y and the fiber-optic gyroscope Z by a method which is the same as the method for measuring the latitude value component measured by the fiber-optic gyroscope X; and finally, solving the vector sum of the three latitude value components according to the formula described in the specification to obtain the final geographic latitude value phi.

Description

technical field [0001] The invention belongs to the fields of astrometry and celestial mechanics, geodynamics, inertial navigation technology, and geodesy, and can be used in the fields of aviation, aerospace, artificial satellite precision orbit determination, deep space exploration, and global plate movement monitoring research. It provides a A method for determining geographic latitude using a fiber optic gyroscope. Background technique [0002] Due to the influence of different celestial bodies outside the earth and the physical mechanism inside the earth, the rotation process of the earth is unstable, and the rotation state of the earth is usually described by the parameters of the earth's rotation, including the pole shift and the change of day length, where the pole shift is the rotation of the earth Movement of the shaft relative to the crust. After the pole moves, the latitude, longitude and azimuth of the ground station will change accordingly. We can deduce the c...

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Problems solved by technology

[0004] First, the observation system is huge, the system construction is very complicated, and the equipment required is expensive;

[0005] Second, a large-scale ground-air joint measurement is required, and the observation period is long, and the amount of data obtained is limited;

[0006] Third, in terms of obtaining results, it takes a long time for data processing, and the calculation of results is very complicated

[0007] At this stage, there is also a technology that uses a mechanical gyroscope to measure the parameters of the earth's rotation. Although this measurement method greatly shortens the observation time, the mechanical gyroscope is easily affected by factors such as wind, vibration, and temperature, which affects the measurement of the earth's rotation parameters. the accuracy of

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