Method for fast calibration of medium-and-low-precision optical fiber inertia units

A calibration method and optical fiber technology, applied in the inertial field, can solve the problems of long calibration time and large amount of data, and achieve the effect of good consistency, high parameter accuracy and short test time

Inactive Publication Date: 2016-10-12
BEIHANG UNIV
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Problems solved by technology

[0006] In order to solve the problems of large amount of data and long calibration time in existing calibration methods, the present invention provides a fast calibration method for optical fiber inertial groups with medium and low precision

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  • Method for fast calibration of medium-and-low-precision optical fiber inertia units
  • Method for fast calibration of medium-and-low-precision optical fiber inertia units
  • Method for fast calibration of medium-and-low-precision optical fiber inertia units

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Embodiment Construction

[0021] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0022] The optical fiber inertial group is composed of a fiber optic gyroscope and an accelerometer. The error of a single instrument is also the object of calibration. The output of the instrument is proportional to the actual value of the measurement, which is called the scaling factor. When the actual value of the measurement is zero, the output of the instrument is not zero. , called zero bias. The essence of calibration is the acquisition and compensation of scale factor and zero offset.

[0023] The basic principle of inertial measurement unit (IMU) testing is to use external input signal excitation to obtain the output data of gyroscopes and accelerometers at various positions or speeds, and substitute them into the calibration model equation to calculate the error parameters of gyroscopes and accelerometers. The calibration method of the pres...

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Abstract

The invention provides a method for fast calibration of medium-and-low-precision optical fiber inertia units and belongs to the technical field of inertia measurement. The method comprises the steps of controlling a turntable rotation inertia measurement unit according to a designed calibration path, and measuring output data of the east-north-up orientation, down-north-east orientation, down-east-south orientation and east-up-south orientation and output data during orientation conversion in sequence; then calibrating the scale factors and null biases of a fiber-optic gyroscope and an accelerometer according to mathematic models of the fiber-optic gyroscope and the accelerometer. By the adoption of the method, the null biases and scale factors of the fiber-optic gyroscope and accelerometer, twelve error coefficients in total, can be calibrated accurately within a short period of time, calibration efficiency is high, and calibration is easy. The method is suitable for fast calibration of the medium-and-low-precision optical fiber inertia units produced in bulk, and can promote the application and popularization of other medium-and-low-precision inertial devices.

Description

technical field [0001] The invention relates to a calibration method, which relates to the technical field of inertia, in particular to a fast calibration method for a medium and low-precision optical fiber inertial measurement unit. Background technique [0002] The inertial measurement unit (IMU) is composed of medium and low-precision fiber optic gyroscopes and quartz flexible accelerometers. It has a wide range of applications in the military and civilian fields, such as helicopters, drones, air-to-air missiles, and camera stabilization systems. Companies such as JEA in Japan, Honeywell in the United States, and Litton in the United States have mass-produced various levels of fiber optic gyroscopes. Medium and low-precision fiber optic gyroscopes have entered the stage of productization, and have been widely used in military and civilian fields such as aerospace, automobile industry, electromechanical industry, electronic technology, control science and information techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 高爽李慧鹏张晓娇蔡晓雯王文杰张维睿李胜臣
Owner BEIHANG UNIV
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