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借助于鲁棒观测器或卡尔曼-布西滤波器去估计飞行状态参数不仅可以取得那些测量精度不高或实际不可测量的状态参数,而且可以提供多余度信息,以提高飞行控制及导航系统的安全性。至今已研究了估计飞行力学的迎角及测滑角的各种结构的纵横向运动耦合的非线性观测器,并数字仿真了它们在各种机动飞行的估计特性。本文通过离线飞行试验验证这些数字仿真结果,试验结果证实了数字仿真结果的正确性。特别引人注目的是,具有线性加速度反馈的简化二阶的纵横向运动耦合的非线性观测器在各种机动飞行下迎角及侧滑角的估计值与相应的测量值均令人惊疑的一致,其估计精度达到了实际飞行控制及导航系统要求的0.2°范围内,而且试验也证实了这种观测器具有很好的抗大气紊流干扰及抗工作点(飞行状态)变化的鲁棒性。这些为在线的实际应用创造了条件。
Using the robust observer or the Kalman-Bouss filter to estimate flight state parameters not only makes it possible to obtain state parameters that are not highly accurate or virtually unmeasurable, but also provide redundant information to improve the flight control and navigation system’s safety. To date, nonlinear observers coupled with longitudinal and transverse motions of various structures that estimate the angle of attack and slip angle of flight mechanics have been studied and their estimated characteristics of various maneuvers have been numerically simulated. In this paper, we verify these digital simulation results through off-line flight test. The experimental results confirm the correctness of the numerical simulation results. Particularly noticeable is that both the estimated and the measured values of the attack angle and the side slip angle under various maneuvering flights are all alarming for the simplified second-order longitudinal and transverse kinematic coupled nonlinear observer with linear acceleration feedback The accuracy of this observer is within 0.2 ° of the actual flight control and navigation system requirements. Experiments have also proved that this observer has good robustness against atmospheric turbulence and changes in the working point (flight state) Sex. These create the conditions for the practical application online.