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《Micronanoelectronic Technology》 2017-02
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Two-Step Calibration Method Based on the MIMU Measurement System

Liu Zhiwen;Zhang Xiaoming;Ma Xihong;Science and Technology on Electronic Test and Measurement Laboratory,North University of China;  
The three-axis accelerometer is an important component of the micro inertial measurement unit(MIMU)measurement combination,and its measurement accuracy directly affects the attitude algorithm accuracy of the system.Therefore,it is necessary to analyze and compensate for the zero-bias error,scale factor error,non-orthogonal error of the three-axis accelerometer and the installation error between the sensor and test unit of the three-axis accelerometer.A twostep calibration method was proposed,the error model of the micro inertial measurement combination was analyzed by using the MIMU on-the-spot rapid calibration method of the ellipsoid hypothesis to obtain the zero bias,scale factor and non-orthogonal angle of the accelerometer firstly.Then the installation error of the accelerometer was calibrated by the four-position method.The method is simple in the actual operation with no need for high-precision auxiliary equipment.The experimental results of the test platform show that the method can effectively improve the measurement data accuracy of three components,and can be applied to the calibration of the accelerometer in MIMU attitude measurement systems.
【Key Words】: micro inertial measurement unit(MIMU) attitude algorithm ellipsoid fitting four-position method error calculation
【Fund】: 国家自然科学基金资助项目(51375463)
【CateGory Index】: TN96
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