针对平台式惯性导航系统陀螺仪和加速度计在动态使用过程中更换无法重新精确标定的问题,文中提出了利用舒勒周期振荡确定陀螺仪和加速度计标度系数的方法.采用FFT算法实现了系统振荡周期计算,在FFT算法无法满足测量精度的条件下,采用线性调频z变换大大提高了振荡周期测量精度.计算机仿真和试验结果表明:该方法能快速、准确地实现对惯性元件标度系数的标定.
A new method is provided to recalibrate the scale factor for a gyroscope and accelerometer used in ship navigation systems. The Schuler oscillate period was measured by using fast Fourier transform (FFT) method and measurement precision was enhanced greatly by using chirp z-transform (CZT). Computer simulations and experiment results show that this method can recalibrate the scale factor of an inertial sensor quickly and accurately.