Coherent Wind Radar Wind Velocity Measurement Method

Abstract

The invention provides a coherent windfinding radar wind speed measurement method. The air speed resolution ratio and air speed measurement speed can be remarkably increased by using the method. By means of the technical scheme, the coherent windfinding radar wind speed measurement method includes the steps that a photoelectric detector receives optical signals, generates simulation time-domain signals in the expression form of voltage and inputs the simulation time-domain signals into high-speed analog-digital conversion circuit to be processed in a quantification mode to obtain corresponding digital time-domain signals, and the digital time-domain signals are conveyed to a field-programmable gate array (FPGA) circuit through asynchronous first-in first-out (FIFO); in the FPGA circuit, complex modulation frequency shift is carried out on the digital time-domain signals at the local frequency band close to a predicted frequency shift angle through a complex modulation module by a Zoom FFT operation module to obtain imaginary part sine and real part cosine signals; a DSP circuit inputs characteristic frequency rough measurement values obtained by a global frequency spectrum analysis module and characteristic frequency accurate measurement values obtained by a zoom spectrum analysis module into a comprehensive analysis module and sends calculated accurate speed to a display component.

Description

technical field [0001] The invention relates to a digital signal processing method used when an airborne continuous laser coherent wind measuring radar performs the task of measuring the relative wind speed between the aircraft and the atmospheric environment under the high-speed flight environment of the aircraft. Background technique [0002] Lidar is a modern optical remote sensing technology that obtains target-related information by detecting the scattered light characteristics of long-distance targets. With its high operating frequency, narrow beam, high resolution, non-contact measurement and other excellent performance and characteristics, laser wind radar has obvious technical advantages in high-precision wind speed measurement, and has become an ideal remote sensing wind speed measurement instrument. Laser Doppler wind radar adopts optical method for non-contact real-time measurement, which is an active measurement system, which mainly uses the Doppler frequency sh...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a Doppler with high data refresh rate and spectral resolution, which can improve airspeed resolution and calculation speed, aiming at the problem of low speed resolution of coherent wind measuring radar and the deficiencies of the prior art. Le shift signal processing method

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