Research On Data Processing Of 1.55 ?M Coherent Laser Wind Radar

The atmospheric wind field has important significance for the environment we live in.It not only affects our daily life,but also has important applications in aerospace and civil use.All-fiber coherent laser wind-gathering radars,due to their use of fiber-optic structures,can reduce the complexity of the system significantly.They can be miniaturized,easy to operate and suitable for different situations.At the same time,it also has the advantages of high speed accuracy,wide measurement range,and real-time measurement.Firstly,the background and significance of the topic are introduced.Then the researching status of the domestic and foreign dry laser radars are introduced and analyzed.At the same time,the data processing methods are investigated and the main research contents of this paper are put forward.Second,the basic principles of coherent laser wind radar,including the principle of Doppler shift and heterodyne coherent detection,are introduced.It describes the source of noise and noise power in the experimental system.The basic methods of data processing are introduced Fast Fourier transforms and Gaussian fitting to improve accuracy.Third,radar system data processing and speed accuracy testing are introduced.The principle of signal processing is analyzed to verify the correctness of the data processing method.Through the simulation of the echo signal,the relationship between the number of superimposed frames and the spectrum stability is obtained.The measurement accuracy of the system is tested.The measurement accuracy of the system is 0.26 m/s by measuring the speed motor.Finally,the noise spectrum stability and noise power are analyzed.At the same time,a data processing plan is put forward,and a wind test is conducted before the500 m building.