机载分布式POS传递对准建模与仿真

Modeling and simulation of transfer alignment for distributed POS

为了提高机载分布式POS中子POS的测量精度,补偿机翼的挠曲变形,提出了一种机载环境下传递对准方法。为验证该方法的有效性,搭建了机载分布式POS地面演示系统。针对该地面演示系统,提出了运用ANSYS辅助力学建模的方法建立了模拟机翼杆挠曲运动模型,并将由机翼挠曲运动产生的挠曲变形角和挠曲变形角速度增广为卡尔曼滤波的状态变量。在此基础上,详细推导了考虑挠曲变形时姿态误差量测方程,设计了基于"速度+姿态"匹配方式的卡尔曼滤波器。仿真结果表明,采用该挠曲变形补偿方法进行传递对准,水平失准角精度优于3?,方位失准角精度优于5?。仿真结果验证了该方案的可行性,为机载分布式POS提供了工程应用参考。

To improve the precision of slave POS（position and orientation system） in distributed POS and compensate for the wing＇s flexure deformation of aircraft, a novel transfer alignment method was proposed. The ground-demo of the distributed POS was set up to test the proposed method. A mechanical method with the aid of the ANSYS software was used to establish the motion equation of the model wing. Then the flexure angle and its angular rate were added to the state variables of the Kalman filter. Based on this, the attitude error measurement equation was deduced with considering the flexure. The Kalman filter using the ＂velocity＋attitude＂ matching algorithm was designed. The simulation results show that the precisions of horizontal angle and azimuth angle are superior to 3＇ and 5＇ respectively by the proposed method. All these characteristics show that the scheme is feasible ahd can provide references for the engineering application of the distributed POS.