Calibration method of optical inertial measurement unit with redundant oblique shaft of carrier rocket

Abstract

The invention discloses a calibration method of an optical inertial measurement unit with a redundant oblique shaft of a carrier rocket. The calibration method comprises the following steps: step one, leveling of a marble slab: placing a level gauge on the marble slab, and repeatedly adjusting the levelness of the marble slab until meeting the requirements; step two, electrifying and preheating of an inertial measurement unit: after installing the inertial measurement unit in a regular hexahedral tool, connecting a testing cable for preheating; step three, calibrating a scale factor and an installation error of a gyroscope through a velocity method; step four, calibrating zero bias of the gyroscope and a scale factor, an installation error and zero bias of an accelerometer through a position method; step five, data processing and analysis: solving the scale factors, the installation errors and the zero bias of the gyroscope and the accelerometer through methods of least square fit and the like.

Description

technical field [0001] The invention relates to a test method, in particular to a method for calibrating an optical fiber inertial group with redundant oblique axes of a launch vehicle. Background technique [0002] The fiber optic gyroscope is a new type of gyroscope developed based on the Sagnac effect. The inertial group using the fiber optic gyroscope is called the fiber optic inertial group. The calibration method based on the turntable is a relatively mature inertial group calibration method, and it is one of the main technologies of the strapdown inertial navigation system. Through calibration, the mathematical model parameters of the inertial navigation system can be accurately obtained, such as scale factor, installation error, zero offset, etc. , to compensate the calibrated parameters in the navigation solution, and the calibration accuracy will affect the navigation accuracy. [0003] The characteristics of the optical fiber inertial unit for transportation are ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a method for calibration of optical fiber inertial sets with redundant inclined axes for carrying models, and this method can solve the problem that traditional calibration methods must rely on expensive high-precision three-axis turntables and The calibration result will be affected by factors such as the speed accuracy of the turntable

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