静基座转动修正战车加速度计零偏方法研究

为提高战车捷联惯导系统的初始对准精度,研究了二位置转动修正加速度计零偏的方法。通过对捷联惯导系统静基座的误差方程作Lyapunov变换,得到转动过程中加速度计零偏误差的传播方程,利用等效转动矢量的方法推导出方程的解析解,分析解的稳定性得出二位置对准的最优转动角度。

旋转惯导系统误差自补偿原理分析及试验验证

为分析旋转惯导系统误差自补偿原理,分别推导陀螺漂移的随机常值分量、时间相关分量以及随机游走分量在捷联惯导系统和旋转惯导系统中造成的角度误差及其统计特性,并进行对比。结果表明,旋转可将陀螺漂移中的常值分量完全调制并能抑制时间相关分量的影响,但对随机游走分量造成的误差无调制效果。采用0.1(°)/h漂移率的陀螺和0.2mg偏置的加速度计研制旋转惯导系统样机并进行导航试验,试验结果表明,该系统可以达到0.2nmile/h导航精度。

Multiple dependent reliability estimation of large range MEMS accelerometers in high temperature environment

In the past,only one performance parameter was considered in the reliability estimation of micro-electro-mechanical system (MEMS) accelerometers,resulting in a one-sided reliability evaluation. Aiming at the failure condition of large range MEMS accelerometers in high temperature environment,the corresponding accelerated degradation test is designed. According to the degradation condition of zero bias and scale factor,multiple dependent reliability estimation of large range MEMS accelerometers is carried out. The results show that the multiple dependent reliability estimation of the large range MEMS accelerometers can improve the accuracy of the estimation and get more accurate results.