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A Sea Surface Wind Velocity Retrieval Method Based on Imaging Altimeter Remote Sensing Data

A sea surface wind speed and inversion technology, applied in speed/acceleration/shock measurement, radio wave reflection/re-radiation, fluid velocity measurement, etc., can solve the problem of not applicable sea surface wind speed inversion model function, etc., to achieve data processing process Ease of use, high inversion accuracy and simple principle

Active Publication Date: 2021-09-24
THE PLA NAVY SUBMARINE INST
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  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a sea surface wind speed inversion method for imaging altimeter remote sensing data, to solve the problem that there is no sea surface wind speed inversion model function suitable for large swaths and large incident angles, and to more truly reflect the actual situation at the time of measurement. wind speed

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  • A Sea Surface Wind Velocity Retrieval Method Based on Imaging Altimeter Remote Sensing Data
  • A Sea Surface Wind Velocity Retrieval Method Based on Imaging Altimeter Remote Sensing Data
  • A Sea Surface Wind Velocity Retrieval Method Based on Imaging Altimeter Remote Sensing Data

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Embodiment 1

[0037] Example 1: Building a function model

[0038] S1: Matching data preparation:

[0039] S1-1: Simulation Dataset

[0040] S1-1-1: When the measured data cannot be obtained before the launch of the imaging altimeter satellite, the simulation data set can be used to construct the model function. The simulation data is obtained based on the theoretical formula of the sea surface backscatter coefficient combined with the observation conditions of the imaging altimeter, and the observation band, incident angle and sea surface wind speed are the input parameters.

[0041] S1-1-2: Assuming that the imaging altimeter observation conditions are: the observation band is the Ku band, the satellite orbit height is 850km, the sea surface observation swath is 160km, and the sub-satellite observation blank length is 10km, then the angle of incidence θ ranges from 0.67° to 11.3° ( See Figure 4 ).

[0042] S1-1-3: The formula for calculating the sea surface backscatter coefficient is ...

Embodiment 2

[0079] Example 2: Inversion of sea surface wind speed

[0080] S4-1: Perform quality control and grid processing on the imaging altimeter remote sensing data to provide basic data support for the inversion of sea surface wind speed;

[0081] S4-2: when the angle of incidence is less than 7°, the sea surface wind speed inversion selects the model function of the radar altimeter; within the angle of incidence of 7° to 11.3°, utilizes the newly established double-exponential wind speed model function to invert the wind speed;

[0082] S4-3: By setting the wind speed initial guess value and iteration method, utilize the maximum likelihood method criterion to invert the sea surface wind speed;

[0083] S4-4: The maximum likelihood method for sea surface wind field inversion, which determines the sea surface wind speed by comparing the difference between the backscatter coefficient calculated by the model function and the backscatter coefficient obtained by measurement.

[0084] Th...

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Abstract

The purpose of the present invention is to provide a sea surface wind speed inversion method for imaging altimeter remote sensing data, to solve the problem that there is no sea surface wind speed inversion model function suitable for large swaths and large incident angles, and to more truly reflect the actual situation at the time of measurement. wind speed. The method of the present invention can obtain more accurate actual wind speed information by using the new sea surface wind speed inversion mode function within the incident angle of 7°~11.3°, compared with the original wind speed mode function only based on the incident angle of 0°~7°. The wind speed at an incident angle of 7°-11.3° can reflect the actual wind speed to the greatest extent. The principle of the method is simple, the process of data processing is easy to realize, and the retrieval accuracy of sea surface wind speed is high.

Description

technical field [0001] The invention belongs to the technical field of sea surface wind speed remote sensing inversion, and specifically relates to a sea surface wind speed inversion method for imaging altimeter remote sensing data, which is based on the microwave scattering coefficient under the condition of small incident angle to construct a sea surface wind speed inversion mode function, which is used for imaging altimeter remote sensing Inversion of sea surface wind speed from the data. Background technique [0002] The sea surface wind field affects the dynamic process of the ocean. It regulates the sea-atmosphere change process, affects environmental elements such as waves, ocean currents, water masses, atmospheric temperature, gas molecules, and heat flow between the sea and the air, and maintains the regional and global climate. Sea surface wind field measurement is of great significance for marine environmental numerical forecasting, marine disaster monitoring, sea...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/95G01P5/00
CPCG01P5/00G01S13/882G01S13/95Y02A90/10
Inventor 王丹孔晓娟于振涛程普秦锋余路李婷婷陈捷迟铖
Owner THE PLA NAVY SUBMARINE INST