Paper Title
High-Accuracy Ultrasonic Anemometer Base on STM32 Microcontroller

Abstract
This paper presents a high-accuracy and steady anemometer. By using the fact that the Time of Flight (ToF) of ultrasound vary in tailwind and headwind, the system computes the ToF delay in different signals, and convert that into wind speed. STM32 is used in the system as the control core, and the ultrasonic transducers play roles to transmit and receive ultrasound propagate between two transducers. Among all algorithms in the paper, the “FFT phase algorithm” is a relatively different one. FFT phase algorithm computes the wind speed with, in compare of the traditional method, frequency domain data decomposed from the time domain, applying the time shifting properties of Fourier transform, and finally convert the time delay into the wind speed. Instead of directly analyzing the time domain signals, the FFT phase algorithm successfully breaks the limit of the sampling frequency. The proposed system is designed to have better accuracy and lower cost in contrast to anemometer that available. Keywords - Anemometer, time of flight, ToF, transducers, FFT.