Method for Determination of Wind Speed ​​by Wind Profiler Radar

A technology of wind profiler radar and measurement method, applied in the field of wind profiler radar, can solve the problems of limiting the accuracy of signal center frequency estimation, limited signal spectral resolution, etc. Effect

Inactive Publication Date: 2018-02-23
CHENGDU UNIV OF INFORMATION TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Due to the limited transmit pulse width, the resolution of the signal spectrum after Fourier transform is limited, which limits the accuracy of signal center frequency estimation

Method used

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  • Method for Determination of Wind Speed ​​by Wind Profiler Radar
  • Method for Determination of Wind Speed ​​by Wind Profiler Radar
  • Method for Determination of Wind Speed ​​by Wind Profiler Radar

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Embodiment

[0041] Set the emission pulse as a high-frequency laser pulse with a fixed frequency, its wavelength λ=1.55μm, the difference between the emission pulse and the local oscillator frequency, namely f 1 It is 81.5MHz, assuming that the frequency shift of 1MHz is generated due to the influence of wind speed after the transmission pulse is transmitted, so the center frequency f after the down-conversion of the reception pulse is 2 It is 82.5MHz, that is, △f=f 2 -f 1 =82.5-81.5=1MHz, the wind speed is In order to verify the effectiveness of the algorithm proposed by the present invention, a sine signal with a frequency of 82.5 MHz is simulated to represent the echo pulse signal after down-conversion. In order to simulate the real detection environment, Gaussian noise is added to the pulse signal, and the signal Sampling frequency is 400MHz, after sampling, carry out center frequency with traditional method and the method that the present invention proposes respectively to seek, a...

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Abstract

The invention relates to wind profile radar. The invention discloses a wind profile radar wind speed determination method. The wind profile radar wind speed determination method of the invention comprises the steps of: a. receiving an echo signal and processing the echo signal to obtain an intermediate frequency signal; b. performing data sampling for the intermediate frequency signal; c. performing Hamming window weighted approach for the sampling signal; d. performing quick Fourier transform for the weighted signal; e. performing batten function interpolation for the signal after Fourier transform and finding the frequency spectrum amplitude maximum value f2; and f. calculating the average wind velocity Vr according to the following equation shown in the description, wherein f1 is the slip frequency between the emitted signal and the local oscillator frequency; Lamda is the wave length of the emitted signal; and f2-f1=Delta f is doppler frequency shift. The wind profile radar wind speed determination method of the invention enables the frequency spectrum information to be more precise by means of the frequency spectrum interpolation based on a spline function, and the center frequency estimation for the frequency spectrum after application of spline interpolation is more accurate than a traditional center frequency measuring method, thus greatly improving the accuracy for determining the wind profile radar wind speed.

Description

technical field [0001] The invention relates to a wind profile radar, in particular to a wind speed measurement method of the wind profile radar. Background technique [0002] The wind profiler radar measures the wind field information by transmitting single-frequency pulse signals, and the average wind speed information is realized by measuring the Doppler frequency shift of the center frequency of the transmitted pulse, such as the shift of the spectrum center of the measured transmitted pulse and received pulse ( Doppler frequency shift) is △f=f 2 -f 1 , where f 1 and f 2 are the center frequencies of the transmitted signal and the received signal respectively, then the average wind speed V r According to the wind speed formula: [0003] [0004] calculated. In the formula, λ is the wavelength of the transmitted signal. [0005] Usually, the center frequency f of the transmitted signal 1 It is the difference between the transmitted pulse and the local oscillato...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/95
CPCG01S7/02G01S13/95Y02A90/10
Inventor 王海江张福贵刘玟宏张双
Owner CHENGDU UNIV OF INFORMATION TECH
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