互补滤波技术在飞机侧滑角融合修正中的研究与应用

Research and application of complimentary filter in the fusion and correction of angle of sideslip

现代飞机采用先进的嵌入式或分布式大气数据系统获取高精度的侧滑角。针对某型飞机在高速状态下受到外型结构影响导致侧滑角精度下降的问题,提出了一种互补滤波器解算方法。该方法以压力传感器输出的侧滑角为基础,将L型压力受感器组件输出的侧滑角作滤波修正。通过对压力传感器输出的侧滑角进行功率谱密度分析,设计了合理的滤波器结构。理论分析与实验验证表明,算法在充分保留压力传感器低频有用信号和压力受感器组件高频有用信号的同时,有效滤除了各自的噪声分量,使侧滑角误差保持在0.2°范围内,保证了侧滑角解算精度,并已应用于某型飞机。

Advanced FADS or distributed ADS are applied in Modern aircrafts to acquire angle of sideslip（AOSS）with high accuracy.Aiming at the problem of the decline of AOSS accuracy caused by the shape of the aircraft at high speed,a complimentary filter method is proposed which is based on the AOSS acquired by pressure sensor unit and using the AOSS acquired by ＂L＂shape pressure transport to correct the former one.Through the analysis of PSD of AOSS calculated by pressure sensor,a reasonable filter is designed.Theory analyze and experimentation shows that with application of the complimentary filter method,both useful signals of pressure sensor unit and the＂L＂shape pressure transport unit are captured fully while the noise of them are filtered separately.As a result,the error of AOSS is within0.2°and the accuracy of AOSS is guaranteed.The algorithm is applied successfully on our aircraft.