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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。
Aiming at the situation that the false alarm is easy to occur during the design of aircraft stall protection, a hybrid filtering method based on FIR and traditional filter is proposed. Combining with the motion characteristics of the aircraft body, frequency analysis of two important parameters involved in the logic operation of stall protection, namely lateral acceleration and angle of attack, was carried out. The hybrid filter was designed based on the characteristics of the signal, then the filter pair was designed by Simulink filter kit The signal is filtered. The simulation results show that this method can reduce the false alarm rate, especially the false alarm rate under large background noise, and verify the correctness of the filter design so as to improve the compliance of the stall protection function to the airworthiness clause. The filter design method can not only effectively solve the problems mentioned in this article, but also have reference significance to other system designs involving signal processing.