A Fiber Optic Gyro North Finder

Abstract

The invention discloses a fiber optic gyro north finder. The fiber optic gyro north finder comprises a base, a transmission device, a rotating shaft, an indexing disk, a bracket, a cable I, a hollow cup motor, a motor outer seat, a motor base, a bearing part, a bearing outer pressure ring, a bearing inner pressure ring and a carbon film part, wherein the bracket is provided with a bracket chassis and a bracket body; the bracket chassis and the bracket body are connected integrally; the bracket body is perpendicular to the bracket chassis; the bracket chassis is fixed to the indexing disk; the bracket body is fixedly provided with a detection system and a circuit board; the detection system comprises an accelerator and a fiber optic gyro; the detection system is used for detecting gravity acceleration and a rotation horizontal component of an earth; the cable I penetrates out of the base after passing through a groove of the bracket chassis, a gap of the rotating shaft, a through hole of the rotating shaft and a cable hole of the base in sequence. According to the fiber optic gyro north finder, an anti-cable winding structure is not adopted, so that the structure is simplified; the hollow cup motor is adopted, so that components are reduced, the system size is reduced, and the fiber optic gyro north finder has the advantages of simple structure, compactness and high north finding accuracy.

Description

technical field [0001] The present invention relates to the technical field of inertial navigation, in particular to a fiber optic gyro north finder. Background technique [0002] The fiber optic gyro north finder is a high-precision inertial instrument that can automatically indicate the orientation in all weathers under static conditions. It uses the earth's rotation angular rate component measured by the fiber optic gyro and the gyro axial horizontal error angle measured by the accelerometer to obtain the angle between the reference axis fixed on it and the true north direction through calculation, so as to obtain a certain value of the carrier. An angle between a fixed axis and the north direction. [0003] In the fiber optic gyro north finder, there are generally two-position method, four-position method and multi-position method to work. Among them, the north finder using the principle of the four-position method is more commonly used, but it has the following defects...

AI Technical Summary

Problems solved by technology

[0004] 1. Existing north finders generally use mechanical gyroscopes as the core components of north seekers, but mechanical gyroscopes have poor reliability, short life, and are easily affected by acceleration, resulting in insufficient test accuracy and poor stability;

[0005] 2. The existing north finder generally uses a single gyroscope and a double accelerometer. After the indexing system rotates to four directions, the gyroscope and the accelerometer are used to measure respectively, and then the north finder's north angle and attitude angle are calculated. North, due to the use of dual accelerometers, the volume of the system is increased, and the manufacturing cost is also increased;

[0006] 3. The existing north finder generally connects the cable on the bracket to the housing, which is prone to entanglement and hinders the rotation of the bracket. For this reason, an anti-cable winding structure is generally used, but it brings a complex structure and a large volume. increased manufacturing costs;

[0007] 4. The accuracy of the north finder has a great relationship with the accuracy of the north finder position. The existing north finder system uses a photoelectric encoder to determine the four positions of the indexing system to ensure the accuracy of the north finder position. However, the photoelectric encoder The device has the defects of large size and high price; at the same time, the photoelectric encoder needs to be installed at the center of the rotating shaft when it is used, so it increases the difficulty of the overall structural design of the north finder device, and finally leads to the north finder with a large volume and high cost. defect

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