Wind Speed And Direction Measurement Method Based On MVDR Beamforing Algorithm

There is a close relationship between wind with people's real life.The measurement of wind information has practical significance for meteorology,aviation,and navigation.Many scholars at home and abroad have conducted a lot of relevant research on wind measurement.Due to its wide measuring range,fast measurement speed,and high accuracy,ultrasonic has been widely recognized for its use in wind speed measurement.Ultrasonic wind measurement technology is mainly based on the time difference method to start research.The time differ ence method needs to measure the time of flight(TOF)required for the ultrasonic signal to travel between the transmitting and receiving ends of the ultrasonic sensor.When the environment is complicated,the environmental noise increases,and the measure ment of the transit time(TOF)becomes more difficult and may even cause some methods to fail.This dissertation studies the advantages of array signal processing to effectively suppress interference noise and combines the measurement of wind speed and direction with the MVDR beamforming algorithm.The main contents of this paper are as follows:1.It derived the array flow pattern of the four-arc ultrasonic sensor array structure.The quaternary arc ultrasonic sensor array was extended to an array of N-arc ultrasonic sensor arrays,and its array flow pattern was deduced.For the N-arc ultrasonic sensor array,the resolution range,the relationship between the resolving power and the array structure,and the expression of the Cramereau boundary are discussed.Based on the N-arc ultrasonic sensor array structure and MVDR beamforming algorithm,the wind speed and direction are estimated.Simulation experiments verify the effectiveness of the algorithm.3.The MVDR beamforming algorithm based on curved ultrasonic sensor arrays can be improved to simplify the calculation results.Simulation experiments verify its effectiveness and rapidity.4.For the problem that the conventional beamforming algorithm may be limited by the Rayleigh limit,the virtual array element method is used to increase the number of virtual array elements to expand the array aperture to improve the resolution.