实验数据表明，数控车床的几何误差值可以大大超过人们估计的值；
The experiment data indicate that the value of a CNC lathe's geometric errors could be far larger than the value expected.
在GPS信号不可用时，利用SINS和GPS得到数据所形成的误差值来驱动卡尔曼滤波器估计系统误差。
Once the GPS signal is effective, the data gained from SINS and GPS can calculate error value which drives Kalman filter and estimates system error.
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