Design Of Ultrasonic Three-dimensional Wind Speed And Direction Dynamic Measurement System Based On Mobile Platform

The information of wind speed,direction and pitch angle is not only an important reference data to ensure the safe navigation of the ship,but also can make the ship obtain the maximum sailing speed as long as it is used reasonably,which can reduce the consumption of nonrenewable energy such as oil.However,in the process of ship sailing,due to the change of the movement direction of the ship itself,the error of the measurement results of traditional wind measuring instruments will be large.Therefore,in order to measure the wind speed and direction in a moving state,an ultrasonic wind speed and wind direction dynamic measurement system based on the time difference method and a regular tetrahedral non-orthogonal structure is designed.The design of this system makes the dynamic measurement of wind speed and direction of great significance to ensure the safe navigation of ships and solve problems such as energy crisis.According to the measurement method and principle of ultrasonic wind speed,wind direction and pitch angle,on the basis of detailed analysis of the technical advantages and disadvantages of the existing ultrasonic wind measurement devices,an innovative method to measure the tetrahedral non-orthogonal structure of ultrasonic transducers is proposed.method and dynamic compensation method of magnetometer for wind direction under moving platform.The combination of ultrasonic speed measurement technology,high-precision time-to-digital conversion technology and magnetic sensor compensation technology adopted in this system is determined,and the scheme design of ultrasonic wind speed and direction dynamic measurement based on time difference method is completed.The overall measurement scheme of the system mainly includes the design of the system hardware circuit,the software design of the lower computer and the software design of the upper computer.The hardware design part mainly includes the minimum system circuit design of STM32 microcontroller,MS1022 highprecision time measurement circuit design,ultrasonic echo signal conditioning circuit design,AK8963 C magnetometer compensation circuit design,Lo Ra wireless transmission circuit design and power supply circuit design;lower computer software The design part mainly includes the relevant register configuration of the MS1022 chip,the timing analysis of the SPI communication protocol,the measurement and conversion of the wind speed and direction measurement data,and the design of the magnetometer compensation and filtering algorithm;the software design part of the upper computer mainly includes the layout of the humancomputer interaction interface,data reading The configuration of retrieval and display,data saving and playback,etc.After the design of the system hardware circuit and software program is completed,the measurement function of the system is verified by building a test environment.Tests show that the dynamic measurement of wind speed,direction and pitch angle can be achieved by using ultrasonic speed measurement technology,high-precision time-to-digital conversion technology and magnetic sensor compensation technology.Analysis of the measurement results shows that the system wind speed measurement error is within ±1m/s,the wind direction measurement deviation does not exceed 0.8°,and the pitch angle measurement deviation does not exceed 1°.The system can effectively reduce the influence of the ship's movement direction on the measurement of wind speed,direction and pitch angle,and improve the measurement accuracy.