Calibration method and device of back scattering coefficient of space-borne scatterometer

Abstract

The invention provides a calibration method and device of the back scattering coefficient of a space-borne scatterometer. The calibration method comprises the following steps: obtaining a back scattering coefficient corresponding to a wind vector unit in the space-borne scatterometer, the observation geometry of the back scattering coefficient, and reanalysis wind field data matched with the back scattering coefficient and the observation geometry; according to the observation geometry and the reanalysis wind field data matched with the observation geometry, calculating a relative wind direction matched with the observation geometry; according to the relative wind direction, constructing the observation sample set of the obtained back scattering coefficients; and according to a preset standard sample set, calibrating the observation sample set to obtain a calibration result to show whether the back scattering coefficient measured by the space-borne scatterometer is correct or not. The reanalysis sea surface wind field data is used for developing a quick evaluation method of the back scattering coefficient of the dual-cosine distribution characteristics of the wind direction on the basis of the back scattering coefficient, the quick evaluation of the back scattering coefficient can be realized in short time, evaluation accuracy is high through the reanalysis data, and meanwhile, the evaluation method is high in universality.

Description

technical field [0001] The invention relates to the technical field of marine microwave remote sensing, in particular to a method and device for checking the backscatter coefficient of a spaceborne scatterometer. Background technique [0002] The ocean surface wind field is an active factor affecting waves, currents, and water masses, and a basic parameter of ocean dynamics. The monitoring of the global ocean wind field is used in disaster prevention and mitigation in coastal areas, marine environmental protection, and promotion of ocean-related scientific research. is of great significance. Satellite-borne microwave scatterometers (referred to as satellite scatterometers or spaceborne scatterometers) have become the most important means of observation of global sea surface wind fields due to their characteristics of all-day, all-weather, high temporal and spatial resolution, and large coverage. [0003] A satellite scatterometer is a calibrated radar that actively transmit...

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Problems solved by technology

[0005] However, the above-mentioned method of evaluating the backscatter coefficient obtained by the scatterometer measurement requires a long period (usually several months to obtain enough sample data), which cannot meet the requirements of the HY-2A satellite scatterometer when it is launched into the sky. After that, it is necessary to realize the requirement of fast evaluation of the backscatter coefficient under the condition of short data time series

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