十二加速度计阵列解耦算法研究

Study on Decoupling Algorithm of Twelve-Accelerometer Array

在无陀螺惯性测量组合中,加速度计敏感轴偏差使得加速度计能敏感到垂直于敏感轴方向上的加速度,由此产生的耦合效应是导致加速度计输出误差增大的重要因素.针对敏感轴偏差产生的耦合效应提出了相应的解耦算法,并制作了十二加速度计惯性测量组合模型及高精度同步数据采集实验系统.在三轴转台上进行的仿真实验结果表明了解耦算法的有效性.经过解耦,加速度计输出精度达到选用加速度计的分辨率级精度-1-0 3g,比未解耦的输出提高了2个数量级,从源头上降低了无陀螺惯性测量组合的误差.

In non-gyro inertial measurement unit, the coupling effect caused by accelerators＇ sensing axis misalignment can sense the acceleration of vertical direction, which increases the accelerometers＇ output error. To solve the problem, a decoupling algorithm was proposed and a 12-accelerometer inertial measurement unit and a high-precision synchronous signal acquisition system was created. The simulation experiment results based on tri-axial rotating table illustrate that the decoupling algorithm is valid. The accelerometers＇ output precision after decoupling can be up to the selected inertial device＇s resolution precision-- 10^-3 g, which is increased about 100 times. The non-gyro inertial measurement unit＇s error can be decreased from initial source.