Systematic temperature compensation method for laser inertial measurement unit based on spline interpolation iterative correction

Abstract

A systematic temperature compensation method for a laser inertial measurement unit based on spline interpolation iterative correction, provided by the invention, comprises the following steps: (1) obtaining gyro and accelerometer zero offset and scale factors corresponding to different temperature points in a preset temperature range; (2) establishing the initial temperature model of the gyro andaccelerometer zero offset and scale factors by using a cubic spline interpolation technology; (3) offline compensating obtained gyro and accelerometer pulse output values; (4) calculating the zero offset and scale factors corresponding to all the temperature points after the compensation according to the compensated gyro and accelerometer pulse output values; (5) establishing the secondary temperature model of the gyro and accelerometer zero offset and scale factors; (6) normalizing the initial temperature model and the secondary temperature model to obtain a gyro and accelerometer zero offsetand scale factor optimized temperature model; and (7) offline compensating and outputting the actually measured pulse output values of the gyro and the accelerometer by using the optimized temperature model. The method improves the systematic precision of the laser inertial measurement unit.

Description

technical field [0001] The invention relates to a laser inertial group system-level temperature compensation based on spline interpolation iterative correction, and belongs to the technical field of laser inertial navigation. Background technique [0002] Laser inertial groups have been successfully used in launch vehicles, satellites, aircraft, ships and other civilian fields, providing angular velocity and acceleration information for launch vehicles, satellites, aircraft, ships, etc., and are their key equipment. At present, the requirements for the startup time of the laser inertial group are getting higher and higher, and the stabilization time of the inertial group is related to the accuracy of the inertial instrument. Temperature change is the main external factor that affects the performance and stabilization time of inertial instruments. Therefore, the key to shortening the start-up time of inertial units lies in the research on temperature error compensation techno...

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide an easy-to-implement full-parameter system-level temperature compensation method for laser inertial groups, to solve the problems of numerous traditional temperature compensation tests, low test efficiency, and time-consuming problems, while reducing Compensation accuracy error caused by modeling fit error

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