Three-dimensional wind speed and direction measuring method based on multiple signal classification algorithm

Abstract

The invention proposes a three-dimensional wind speed and direction measuring method based on a multiple signal classification algorithm. The method comprises the following steps: arranging ultrasonicsensors in a certain manner, and establishing an appropriate mathematical relationship between the speed, pitch angle and azimuth information of wind in a three-dimensional space; calculating time delay information when each sensor receives the information; and using the multiple signal classification algorithm to carry out subspace classification on a covariance matrix of information data received by a sensor array, calculating a spectral function and searching for a spectral peak value to obtain information about the speed, azimuth and pitch angle of the wind, so that the wind in the three-dimensional space can be accurately measured. The three-dimensional wind speed and direction measuring method based on the multiple signal classification algorithm provided by the invention does not rely on a time difference that an actual signal arrives at each sensor in the case of downwind and headwind, but uses a mathematical relationship between a wind vector and each sensor to calculate thedelay of an emission signal arriving at each receiving sensor. The method is simple to implement, does not require timing, and is less influenced by human and environmental factors.

Description

technical field [0001] The invention belongs to the field of wind speed and direction measurement, and in particular relates to a three-dimensional wind speed and direction measurement method based on a multi-signal classification algorithm. Background technique [0002] At present, for the measurement of wind speed and direction, the main measuring instruments are anemometers based on the principle of heat dissipation, cup anemometers and ultrasonic anemometers. Among them, the ultrasonic anemometer has the advantages of reliability, high accuracy, low loss, long service life, strong anti-interference ability, etc., and is most widely used in practice. [0003] The most commonly used method for measuring wind speed is the Time of Flight (TOF) method, which is based on the principle that when the propagation distance is determined, the wind speed is inversely proportional to the flight time. However, when using an ultrasonic anemometer for measurement, the propagation speed...

AI Technical Summary

Problems solved by technology

However, when using an ultrasonic anemometer for measurement, the propagation speed of the ultrasonic wave in the air will be superimposed with the airflow speed in the wind direction. If the propagation direction of the ultrasonic wave is the same as the wind direction, the ultrasonic wave propagation speed will be accelerated; otherwise, the propagation speed will be slowed down.

So the same wind speed may correspond to different measurement results

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