一种高动态使用微惯性测量单元的实现

针对在振动和高速自旋条件下使用MIMU的问题,提出了一种具备高动态环境适应能力的MIMU设计。采用国产微加速度计和微陀螺作为微惯性传感器,由Honeywell HMC2003完成地磁场测量。采用力学仿真方法分析了随机振动对MIMU本体结构的影响,优化设计后,加速度功率谱密度抑制比达到98.9%;在高速自旋状态下,采用地磁场组合解算方法弥补轴向微陀螺量程饱和所产生的失效数据,300(°)/s以上角速率误差小于1(°)/s。经飞行试验验证,该设计保证了微惯性传感器在高动态环境下的正常工作。

Realization of micro inertial measurement unit used in high dynamic environment

In view of the problems in applying MIMU in vibration and high-speed spin conditions,an MIMU was designed which can work in high dynamic environment.The geomagnetic measurements are implemented with Honeywell HMC2003 by using home-made micro-accelerometers and micro-gyroscopes as micro inertial sensors.Random vibration’s influences on MIMU self structure were analyzed by mechanical simulation,the acceleration power spectral density restrain ratio reaches 98.9% by using the optimized design.Under high-speed spin condition,the geomagnetism combination resolution can be used to compensate the disabled data caused by micro-gyroscope range saturation.The experiment results show that,after compensation,the angle-rate measurement error is less than 1°/s when the angle-rate error is over 300 o/s.The flight experiment verifies that this design can ensure the normal operation of micro inertial sensors in high dynamic condition.