高精度小型无人机空速测量系统设计

Design of airspeed measuring system of high precision small unmanned aerial vehicle

空速是无人机重要测量参数之一,介绍了无人机空速测量原理,论述了系统硬件组成和软件设计。针对指示空速和动压之间的非线性函数关系,提出非均匀线性插值算法进行拟合,在解决单片机计算能力不足的基础上保证了解算精度。实验表明:该系统相对误差小于0.15%,具有精度高、体积小、稳定性和抗干扰性强等特点,满足空速测量系统设计要求。

Airspeed is one of the important measuring parameters of UAV. The principle of the UAV airspeed measuring is introduced. The hardware and software of measuring system are elaborated. Aiming at the nonlinear function relation of indicated airspeed and dynamic pressure,inhomogeneous linear interpolation algorithm fitting is presented. On the basis of solving micro-controller unit computing power shortage of foundation ensures calculating precision. The result shows that the system relative error is less than 0. 15 %. The design system has high precision, small size, strong stability and anti-jamming, it can satisfy the requirement of measuring system.