加速度表动态模型辨识和误差补偿

本文讨论全液浮陀螺加速度表的动态模型辨识及应用辨识所得模型进行动态跟踪误差补偿的方法。文章首先根据陀螺加速度表的动态模型估算了全程跟踪误差,其次介绍了脉冲传递函数参数的最小二乘估计和应用AIC准则来确定MA噪声的滑动阶数的原理。接下来讨论了用内环力矩器输入试验来实现辨识的可行性和实现辨识的一些问题。然后探讨了补偿动态跟踪误差的一些方法。最后对于一阶MA噪声情况应用增广最小二乘法进行了辨识仿真实验。仿真实验结果表明,全液浮陀螺加速度表的动态模型是可以辨识的。

ACCELEROMETER DYNAMIC MODEL IDENTIFICATION AND ERROR COMPENSATION

This paper addresses the identification of the dynamic model of a floated PIGA (Pendulous Integrating Gyro Accelerometer) and compensation methods of the dynamic tracking error with the acquired model. At first, the tracking error within the whole trajectory is estimated according to the dynamic model of a PIGA. Secondly, the least-squares estimation of the parameters of the pulse transfer function and the philosophy of determining the order of the MA (moving average) noise with AIC criterion are described. After that, the feasibility and some problems to realize the identification by the inner gimbal torquer test are discussed. Then, some methods to compensate the dynamic tracking error are introduced. At last,computer simulation experiments of the identification of the dynamic model with the generalized least-squares for MA noise of first order are carried out. The simulation results show that the dynamic model of a PIGA is identifiable.