加速度计的动态特性对无陀螺微惯性测量组合性能影响的研究

本文以压阻式加速度计为例,探讨了其动态特性对无陀螺微惯性测量组合的影响.首先,建立了9个加速度计的无陀螺微惯性测量组合模型,并推导了该模型的导航方程,然后根据加速度计的动态特性改进了其导航方程,最后进行了仿真验证.从仿真结果可以看出,对于相同的加速度计,输入信号的动态特性越强,惯性组合的误差越大.因而选用动态特性好的加速度计有助于提高无陀螺微惯性测量组合的性能.本文为无陀螺微惯性测量组合走向实用化,提供了理论依据.

A STUDY ON THE DYNAMIC CHARACTERISTICS OF ACCELEROMETERS WORKING ON GYRO FREE MICRO INERTIAL MEASUREMENT UNITS

The dynamic characteristics of accelerometers working on gyro free micro inertial measurement units was discussed, with a piezoresistive accelerometer as an example. A model of gyro free micro inertial measurement units with nine accelerometers was first set up and used to calculate the navigational equations and to improve on it based on the dynamic characteristics of accelerometers, and simulation validation was finally processed. For the same accelerometer, the stronger the dynamic characteristics of input signal, the larger the error of inertial unit will appears as the result of simulation. So the selection of accelerometers having the best dynamic characteristics helps to improve the features of gyro free micro inertial measurement units. A theoretical basis was established for the practicability of gyro free micro inertial measurement unit.