基于谐波分析的捷联惯导系统加速度计组件标定技术

惯性器件误差是影响捷联惯性导航系统(SINS)精度的主要原因之一，任何由加速度计和陀螺构建的SINS在使用之前都须进行精确标校，以建立起惯性器件静态误差补偿模型。首先根据三轴加速度计组件的输出建立起加速度计输出模型；然后利用三角谐波的正交特性，设计了1 g重力场下的多位置转台翻滚试验，分离出加速度计组件的各项静态误差系数的解析表达式；最后，分析了由基准误差引入的参数标定误差。利用双轴位置转台对标定方法进行验证，结果证明此方法能够有效标定出三轴加速度计组件的刻度因数、交叉耦合系数和零位偏置，满足系统设计指标要求。

Calibration Techniques for SINS Accelerometer Unit Based on Harmonic Analysis

Inertial sensor error is one of the major error sources to affect the precision of strap-down inertial navigation system (SINS),any SINS combined of accelerometers and gyroscopes must be calibrated elaborately before using,as to establish the static error model for compensation.Firstly,the output model of the three-axis accelerometer unit is established.And then,based-on the triangular harmonic orthogonal property,a multi-position calibration experimental under 1 g gravity field based on the bi-axis turntable is designed,all of the coefficients in analytic expression are deduced.At last,the calibration error aroused by reference panel error is analyzed.A verification calibration test is carried out,the calibration experiment result demonstrates the validity of this method,the sensor scale factor,cross-coupling and zero offset can be calculate easily form the analytic formula.The error accumulation value after compensation achieves the nominal accuracy and satisfies the design requirements.