Portable fibre optic gyroscope north seeker

Abstract

The invention discloses a portable fibre optic gyroscope (FOG) north seeker, comprising a circular installing plate and a rotating shaft vertically arranged on the circular installing plate, wherein one end of the rotating shaft is connected with the circular installing plate by a bearing in a rotatable manner; a support is fixedly arranged on the rotating shaft; a shell containing the support isfixedly arranged on the circular installing plate; the support is provided with a detecting system, a rotating system and a positioning system; and the detecting system comprises a horizontal accelerometer, a vertical accelerometer and an FOG. The north seeker has the advantages of reliable measurement, small size, convenient carrying, low cost and the like.

Description

Technical field [0001] The invention relates to the technical field of inertial navigation, in particular to a portable optical fiber gyroscope north finder. Background technique [0002] The portable gyro north finder is an inertial north finder suitable for outdoor environments. It provides direction information such as the carrier's north included angle and attitude angle. It has the characteristics of light weight, small size and high accuracy. [0003] North finder generally uses two-position method, four-position method, and multi-position method to work in north finder. Among them, north finder using the principle of four-position method is more commonly used. In this four-position north finder device, a single gyroscope and double accelerometer are generally set on the indexing system. After the indexing system is rotated to four positions, the gyroscope and accelerometer are used to measure the north finder, and then the north finder north direction is calculated. Find no...

AI Technical Summary

Problems solved by technology

[0004] 1. The existing north finder devices generally use mechanical gyroscopes as the core components of north seeker, but mechanical gyroscopes have poor reliability, short life, and are easily affected by acceleration, resulting in insufficient test accuracy and poor stability

2. At the same time, 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. The photoelectric encoder has the defects of large volume 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, which eventually leads to the north finder having a large volume and low cost. high defect

The cables of the rotating part and the fixed part are connected through the center of the bearing. Since two bearings are used, it has a certain adverse effect on the miniaturization of the system.

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