Rainfall inversion method based on synthetic aperture radar

A synthetic aperture radar and radar technology, which is applied in the directions of rainfall/precipitation meter, reflection/re-radiation of radio waves, and utilization of re-radiation, etc. Small volume and high precision

Active Publication Date: 2021-08-31
SHANGHAI OCEAN UNIV
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AI Technical Summary

Problems solved by technology

MOS algorithm is a statistical method, the theoretical derivation is not rigorous enough, there are a lot of statistical components, it can basically meet the actual needs in the inversion, but the accuracy needs to be further improved
These shortcomings limit the application of the algorithm; the VIE inversion algorithm is strictly derived based on the VIE integral equation, but the algorithm itself is complex and requires a large amount of calculation

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  • Rainfall inversion method based on synthetic aperture radar
  • Rainfall inversion method based on synthetic aperture radar
  • Rainfall inversion method based on synthetic aperture radar

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Embodiment Construction

[0038] Below according to the accompanying drawings figure 1 , give a preferred embodiment of the present invention, and give a detailed description, so that the functions and characteristics of the present invention can be better understood.

[0039] see figure 1 , a synthetic aperture radar-based rainfall retrieval method according to an embodiment of the present invention, comprising the steps of:

[0040]S1: Obtain the original spaceborne SAR image and the rainfall data measured by TRMM satellite; calculate and obtain the normalized radar backscatter cross section value of the original spaceborne SAR image;

[0041] The collection interval of the rainfall data measured by the TRMM satellite is 3 hours, and the resolution is 0.25°, which is about 25km; when the rainfall data measured by the TRMM satellite is matched with the original spaceborne SAR image, the time gap between the two is no more than 1 half an hour. This set of data is used to determine the relationship b...

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Abstract

The invention provides a rainfall inversion method based on a synthetic aperture radar. The rainfall inversion method comprises the following steps: S1, obtaining an original spaceborne SAR image and rainfall data measured by a TRMM satellite, and calculating to obtain a normalized radar back scattering cross section value of the original spaceborne SAR image; S2, using the improved composite surface radar backscattering model based on the Bragg scattering theory to simulate and obtain a simulated normalized radar backscattering cross section value; S3, determining a relationship between a difference value between the normalized radar backscattering cross section value and the simulated normalized radar backscattering cross section value and the rainfall capacity; and S4, constructing an inversion algorithm. The rainfall inversion method based on the synthetic aperture radar is high in precision and small in calculation amount.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a rainfall retrieval method based on synthetic aperture radar. Background technique [0002] In daily life, the impact of rainfall on human beings is ubiquitous. The location and time of rainfall distribution directly affect the ability of human beings to utilize fresh water resources and directly affect the quality of human life. The extreme rainfall weather accompanied by hurricanes, blizzards, floods, droughts and landslides has seriously affected the survival and development of human society. The observation of rainfall has been an important part of meteorology and hydrology throughout human history. Management of water resources such as agricultural irrigation, flood control, drought response, and freshwater supply all require accurate observation and forecasting of rainfall. Rainfall is not only crucial for water resources, but also plays an important ro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/95G01W1/14
CPCG01S13/9021G01S13/95G01W1/14Y02A90/10
Inventor 孙展凤邵伟增胡宇逸
Owner SHANGHAI OCEAN UNIV
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