基于捷联惯性系统的轨道长波不平顺检测

Detection of Track Long-wave Irregularity Based on SINS

将航空航天飞行器制导中的捷联惯性系统应用于轨道长波不平顺的检测。利用四阶龙格-库塔法求解四元素姿态矩阵微分方程;采用积分滤波器对加速度信号进行二次积分,从而实时获取物体的运动轨迹。为提高系统的稳定性和抗噪性,在积分前利用小波变换对加速度信号进行去噪处理。最后采用XW-IMU5250惯性测量单元实测一个物体的运动,得到了物体精确的运动轨迹,通过对比不同时期测量结果即可得到轨道的长波不平顺信息。

The SINS （strap down inertial navigation system） for detecting long-wave irregularity of track is presented; the Four-order Range-Kuttle method is adopted to calculate the attitude matrix＇s quaternion differential equations; and the real-time displacement information is obtained from the acceleration signals by the integration filter. In order to improve the stability and anti-noise ability of the system, the acceleration is processed by wavelet transform before integration. Finally, with the inertial measurement unit XW-IMU5250, more precise displacement data could be ac- quired from the algorithm, and the information of long- wave irregularity could also be obtained by comparing these results in different periods.