A small, medium and high-precision fiber optic gyro north-finding device and method

Abstract

The invention discloses a small-sized medium- / high-accuracy optical-fiber-gyroscope north seeking device. The device comprises an optical fiber gyroscope, an accelerometer, an I / F circuit, a signal processing and interface circuit, a turntable and a device body, wherein the optical fiber gyroscope is fixed to the device body in a triaxial orthogonal manner, and angular velocity information is sentto the signal processing and interface circuit; the accelerometer is fixed to the device body in a triaxial orthogonal manner, a coordinate system of the accelerometer and a coordinate system of theoptical fiber gyroscope are superposed, current information corresponding to acceleration of the accelerometer is transmitted to the I / F circuit and is converted into frequency signals, and the frequency signals are then sent to the signal processing and interface circuit; a tabletop of the turntable is fixedly connected with the bottom face of the device body, and the rotation of the tabletop ofthe turntable is synchronous to that of the device body; the signal processing and interface circuit is used for sending preset rotating angle information and staying time information to the turntable, and the turntable rotates according to instruction requirements after the information is received; the signal processing and interface circuit performs north seeking computing on angular velocity and acceleration information at different positions.

Description

technical field [0001] The invention relates to a small, medium and high-precision optical fiber gyroscope north-seeking device and method, belonging to the field of ultra-high, ultra-large, and high-precision press-fit assembly. Background technique [0002] The orientation system is mainly used to provide accurate orientation information for weapon launches, and can be widely used in mobile launch vehicles, reconnaissance vehicles, tunnel orientation, track detection and other fields. It can improve the mobility of mobile platforms, improve the survivability and rapid response of combat vehicles The ability to effectively ensure the strike accuracy is of great significance. [0003] The fiber optic gyroscope is an all-solid-state inertial instrument, which has advantages that traditional electromechanical instruments do not have. It is a closed-loop system composed of optical devices and electronic devices. It determines its own angular velocity by detecting the phase dif...

AI Technical Summary

Problems solved by technology

The existing method belongs to the static north-seeking method, which is simple in operation, short in the north-seeking time, and fast in speed. However, the static north-seeking method does not have the ability to resist shaking, and is greatly affected by the drift of the gyroscope, and the accuracy is not high.

The dynamic north-finding method is to rotate the gyroscope with a sensitive axis perpendicular to the horizontal plane to another angle at a constant angular velocity, and estimate the initial azimuth angle of the gyro sensitive axis relative to the true north direction through Kalman filtering. The north-seeking accuracy of this method is High, but the north-seeking time is long, and there is a problem that the filter convergence time is long when the initial deviation angle is large

[0005] The existing north-seeking methods need to bind the initial latitude information. For areas with limited conditions such as field operations and low-lying mines, it is difficult to obtain latitude information. Therefore, the existing methods have a narrow scope of promotion

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