全相位FFT在导弹自动驾驶仪测试中的应用

Application of All-phase FFT Method in Test of Missile Autopilot

自动驾驶仪是导弹的姿态控制系统,其性能好坏决定了导弹飞行的稳定性。为了精确测量其性能,对导弹自动驾驶仪测试原理和方法进行了研究,进行了正弦信号测量方法的分析,提出了基于全相位FFT数据处理方法,并结合时移相位差校正方法实现正弦形式信号的频率、幅度和相位等参数的精确测量;利用LabVIEW图形化编程软件设计了算法软件,通过仿真试验考察了该算法在无噪、低噪和大噪环境下信号测量精度,结果表明全相位FFT方法在信号频谱测量方面具有精度高、抗噪能力强等优点,满足自动驾驶仪的测试需求。

Autopilot is the attitude control system of missile, whose performance determines the stability of the missile flight. In order to accurately measure the performance of the missile autopilot, its testing principle and method are studied. The data processing method based on all phase FFT is proposed , with the analysis of methods of measuring sine signal. It realizes the accurate measurement of the parameters of sinusoidal signals in the form of frequency, amplitude and phase, combined with the time shift phase difference correction method. The software algorithm is designed, using the LabVIEW graphical programming software. The measurement accuracy of the algorithm in noise free, low noise and environmental noise signal is investigated through the simulation experiment. The all phase FFT method has high preci- sion and strong anti noise ability in terms of signal spectrum measurement, which satisfy the test requirements of missile autopilot.