为解决微惯性测量单元(microinertialmeasurementunit,MIMU)中惯性器件的零位输出和灵敏度随时间推移而变化的问题,提出了一种基于椭球拟合的现场快速标定方法。通过建立椭球约束模型、设计现场标定方案、求解二次曲面方程得到了MIMU中加速度计零位、灵敏度等待标定参数;对比实验验证了该标定方法的准确性和有效性,试验结果表明该标定方法可在没有精密标定设备的环境下(如靶场)进行现场标定,其标定精度与转台标定结果精度相当,具有一定的工程应用价值。

In view of the problem of zero position and sensitivity of inertial device in MIMU are not stable and vary with time slowly, a field fast calibration method based on ellipsoid fitting was proposed in this paper. Parameters like zero position and sensitivity of accelerometers in MIMU were got after establishing ellipsoid constraint model, the program of field calibration was designed and the quadric surface equation was solved: The accuracy and the validity of the calibration method were verified by comparative experiments, the test results show that this field calibration method can be used in the environment without precision calibration equipments (such as shooting range) for field calibration, and the accuracy of this method is equivalent to the calibration results with precise turntable, which is valuable in engineering application.