A North-finding Algorithm for Single-Axis Fiber Optic Gyroscope

Abstract

The invention belongs to the field of inertial north-seeking and directional measurement, and in particular relates to a single-axis optical fiber gyroscope north-seeking algorithm. Specifically, the method includes the following steps: collecting gyroscope and accelerometer data at four positions; then calculating the rough north-seeking value; and then calculating the fine north-seeking value. The corresponding north-seeking device includes an acquisition module, a control module, a calculation module and a communication module. The accelerometer signal is collected by the A / D sampling module, while the output of the fiber optic gyroscope is directly collected through the serial port. The collected accelerometer signal and the fiber optic gyroscope The signal is sent to the control module, and then sent to the calculation module after preliminary processing by the control module. Finally, the calculation module uses the north-seeking algorithm to solve the north-seeking result and transmits it to the control module. The control module sends the result through the serial communication module. , other devices can communicate with north-seeking devices through the serial port communication module. The present invention has higher precision, better stability and broad application prospects.

Description

technical field [0001] The invention belongs to the field of inertial north-seeking and directional measurement, and in particular relates to a single-axis optical fiber gyroscope north-seeking algorithm. Background technique [0002] The fiber optic gyroscope is a new generation of angular rate sensor based on the Sagnac effect, and north-seeking orientation is one of the important applications of the fiber optic gyroscope. In the military field, the gyro north finder provides guarantee for the rapid, maneuverable and precise strike of the weapon system; in the civilian field, the gyro north finder provides the azimuth reference for mining, resource survey, tunnel construction, etc. Its application prospect is more and more broad. North-seeking technology usually adopts a static north-seeking scheme, that is, collects gyroscope data at certain positions, and lists equations to solve the north angle according to the components of the earth's rotation angular velocity sensit...

AI Technical Summary

Problems solved by technology

However, there are the following defects: the existing north finder generally uses a mechanical gyroscope as the core component of the north seeker, but the mechanical gyroscope has poor reliability, short life, and is easily affected by acceleration, resulting in insufficient test accuracy and poor stability; The north finder generally uses a single gyroscope and a double accelerometer, which increases the volume of the system and increases the manufacturing cost; the accuracy of the north finder has a great relationship with the accuracy of the north finder position. The existing north finder system uses photoelectric coding The four positions of the indexing system are determined by using an encoder to ensure the accuracy of the north-seeking position, but the photoelectric encoder has the defects of large size and high price; at the same time, the photoelectric encoder needs to be installed at the axis of the rotating shaft when it is used, so it improves the The difficulty in designing the overall structure of the north finder device eventually led to the defects of large volume and high cost of the north finder

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