Cloud and rain microphysical parameter inversion method based on space-borne three-frequency millimeter wave radar

A millimeter wave radar and physical parameter technology, applied in the field of remote sensing, to achieve the effect of small cost function, high spatial and temporal resolution, and fine inversion results

Active Publication Date: 2019-10-22
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

At present, there is no method for inverting cloud and rain microphysical parameters for spaceborne W, Ka and Ku three-frequency millimeter-wave radars. The

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  • Cloud and rain microphysical parameter inversion method based on space-borne three-frequency millimeter wave radar
  • Cloud and rain microphysical parameter inversion method based on space-borne three-frequency millimeter wave radar
  • Cloud and rain microphysical parameter inversion method based on space-borne three-frequency millimeter wave radar

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Embodiment

[0066] combine figure 1 , the present invention is based on the inversion method of cloud and rain microphysical parameters of spaceborne triple-frequency millimeter-wave radar, comprising the following steps:

[0067] Step 1. Based on a large number of ground-based and airborne millimeter-wave radar cloud and rain detection data, statistical analysis is made on the temporal and spatial distribution characteristics of cloud and raindrop particles, and the spectral functions of cloud and raindrops under various typical weather conditions are fitted and summarized;

[0068] Step 2. Perform space-time matching on the satellite-earth detection data, and perform cloud detection based on the threshold method; use the generalized Gamma distribution function to characterize the distribution of cloud and raindrop particles, and perform parameterization, as follows:

[0069] Step 2.1. Match the space-borne W, Ka and Ku tri-frequency millimeter-wave radar data and the ground-based millim...

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Abstract

The invention discloses a cloud and rain microphysical parameter inversion method based on a space-borne three-frequency millimeter wave radar. The method comprises the following steps of firstly, calculating and analyzing cloud and rain particle temporal and spatial distribution characteristics and summarizing, using a generalized Gamma distribution function to characterize cloud raindrop particle distribution and carrying out parameterization; then, based on an idea of a Bayesian estimation theory, establishing an inversion model, presetting prior distribution of the parameters, inputting space-borne W, Ka and Ku three-frequency millimeter wave radar reflectivity factors into a physical model, inputting space-time matching ground-based millimeter-wave radar data as an adjustment factor,carrying out posterior, after iterative calculation, continuously correcting prior probability distribution to minimize the cost function and outputting an optimal inversion result; and finally, carrying out linear processing on an inversion result in each distance library to obtain the inversion result of an entire profile. In the invention, a space-time resolution is high, cost is low, the inversion result is fine and actual distribution of cloud and rain particles can be simultaneously inverted.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, in particular to a cloud and rain microphysical parameter inversion method based on a spaceborne triple-frequency millimeter-wave radar. Background technique [0002] Accurate measurement of cloud and rain microphysical parameters is a necessary guarantee for accurate weather forecasting, a key decision-making aid for analyzing various weather phenomena, and also plays a vital role in artificial weather modification operations. The detection of cloud and rain is mainly divided into direct measurement and remote sensing detection. Among them, direct measurement methods include radiosondes and airborne experiments to measure cloud and raindrop spectra, etc.; remote sensing detection methods use remote sensing instruments such as radars, lidars, and radiometers in various bands. Among them, the implementation of airsondes and airborne experimental measurements requires large material and man...

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Application Information

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IPC IPC(8): G01S13/95G01W1/10
CPCG01S13/95G01W1/10Y02A90/10
Inventor 胡雄余茁夫谭仲辉胡申森严卫
Owner NAT UNIV OF DEFENSE TECH
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