Raindrop spectrum acquisition method and device based on coherent Doppler laser radar

A technology of Doppler laser and acquisition method, applied in the field of raindrop spectrum acquisition based on coherent Doppler lidar

Active Publication Date: 2021-07-06
江苏光在科技有限公司
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Problems solved by technology

[0003] Surface raindrop spectrometers can only provide point measurements of DSD

Method used

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  • Raindrop spectrum acquisition method and device based on coherent Doppler laser radar
  • Raindrop spectrum acquisition method and device based on coherent Doppler laser radar
  • Raindrop spectrum acquisition method and device based on coherent Doppler laser radar

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Embodiment

[0057] Such as figure 1 As shown, the present invention discloses a raindrop spectrum acquisition method based on coherent Doppler lidar, including:

[0058] S1. Acquire raw echo data of coherent Doppler lidar under rainfall conditions.

[0059] Specifically, the present invention applies all-fiber coherent Doppler lidar to precipitation detection in vertical staring mode. The compact all-fiber CDL operates at an eye-safe wavelength of 1.5 μm. It has been used in studies of atmospheric boundary layer heights, gravity waves and turbulence. During the precipitation experiments, the CDL was set to operate in vertical staring mode with a temporal resolution of 1 second. In this application, CDL stands for Coherent Doppler Lidar.

[0060] S2. Perform fast Fourier transform on the original echo data to obtain a power spectrum S(v). in,

[0061] S(v)=S' air (v)+S' air (v)*S rain (v);

[0062] In the formula, S' air (v) is the aerosol signal spectrum, v is the Doppler veloc...

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Abstract

The invention discloses a raindrop spectrum acquisition method and device based on a coherent Doppler laser radar. A real raindrop reflectivity spectrum is obtained by adopting an iterative deconvolution method, and a rainfall reflectivity spectrum can be solved only by performing deconvolution operation once by using an aerosol signal model considering a window effect and constructing an aerosol signal spectrum S 'air (v); meanwhile, according to the method, the theoretical backscattering cross section of the raindrops to the laser band is creatively applied to the coherent Doppler laser radar to obtain raindrop spectrum distribution, and the accuracy and robustness of raindrop spectrum calculation are improved. On the basis that only one coherent Doppler laser radar is used, the rainfall raindrop spectrum distribution is obtained according to the laser radar power spectrum. The method is of great significance to atmospheric meteorological modes, aviation safety and the like.

Description

technical field [0001] The invention relates to the fields of wind laser radar and atmospheric detection, in particular to a raindrop spectrum acquisition method and device based on coherent Doppler laser radar. Background technique [0002] The size distribution of raindrops is a basic microscopic physical property of precipitation. Its vertical profile helps reveal precipitation formation and evolution processes such as collision, coalescence, melting, rupture and evaporation. Additionally, in weather radar applications, information on the raindrop size distribution (DSD for short) can be used to calibrate the rainfall rate (R) estimate derived from radar reflectivity (Z) based on a formula commonly known as the Z-R relationship. [0003] Surface raindrop spectrometers can only provide point measurements of DSD. The vertical distribution of DSD can be obtained from the relationship between the terminal velocity of raindrops and their size using Doppler radar with normal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/14G01S17/95G01S7/48
CPCG01W1/14G01S17/95G01S7/4802Y02A90/10
Inventor 赵自豪潘宁
Owner 江苏光在科技有限公司
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