一种减少失速保护虚警率的混合滤波方法

针对飞机失速保护设计过程中易出现虚警的情况,提出一种基于FIR和传统滤波器相结合的混合滤波方法。结合飞机本体的运动特征,对参与失速保护逻辑运算的两个重要参数,即侧向加速度和迎角信号进行频率分析,基于信号的特征设计混合滤波器,然后采用Simulink滤波工具箱设计滤波器对信号进行滤波处理。仿真结果表明该方法能够减少虚警率的发生,特别是大背景噪声下的虚警率能够得到较好抑制,验证了滤波器设计正确性,从而提高失速保护功能对适航条款符合性。该滤波器设计方法,不但可以有效解决本文提到的问题,对于其他涉及信号处理的系统设计同样具有借鉴意义。

A Mixed Method for Reducing Stall Warning Nuisance

A mixed method based on FIR and traditional low-pass filter is proposed to fix the warning nuisance in aircraft stall protection device. Combined with longitudinal and lateral aircraft maneuvering characteristic, the signal frequency of attack of angle and lateral acceleration of two important parameters used in stall warning logic is analyzed for the mixed filter design, and then Simulink Filter toolbox is used for the filter design. Simulation results show that the stall warning nuisance can be greatly reduced, especially for the strong background noise,and demonstrated the compliance for the stall warning regulation. The proposed method is not only beneficial to reduce the warning nuisance, but also it is beneficial to solve the similar problems.