Satellite-borne radar rainfall correction method based on active and passive microwave joint detection

Abstract

The invention discloses a satellite-borne radar rainfall correction method based on active and passive microwave joint detection, and the method comprises the steps: correcting the deviation between active radar observation data and passive radiometer observation data in the presence of rainfall through employing numerical prediction background field historical data and observation historical data; performing space-time matching on the corrected active radar observation data, the corrected passive radiometer observation data and the numerical forecasting background field atmosphere three-dimensional space distribution information; using the numerical forecasting background field atmosphere three-dimensional space distribution information as prior information, and using the corrected activeradar observation data and the corrected passive radiometer observation data for calculation to obtain an optimal analysis atmosphere cloud and rain profile; and calculating a related rainfall correction coefficient of the active radar according to the optimal analysis atmospheric cloud and rain profile. The method is suitable for various satellite-borne radar systems and passive microwave instruments, and the precision of the rainfall correction coefficient can be guaranteed.

Description

technical field [0001] The invention relates to the field of remote sensing data processing of a satellite radar system, in particular to a precipitation correction method of a spaceborne radar based on active and passive microwave joint detection. Background technique [0002] Microwave radar systems carried on oceanographic and meteorological satellites, such as spaceborne microwave scatterometers, microwave altimeters, and precipitation measurement radars, can provide global, high-resolution, high-frequency, and long-period medium- and small-scale surface wind fields, wave fields, Observational data such as vertical rainfall rate profiles are widely used in meteorological and oceanic scientific research fields such as severe weather forecast and early warning, ocean-meteorological interaction, and climate and numerical model data assimilation. The scatterometer and altimeter on the my country Haiyang No. 2 (HY-2) satellite in orbit have played great value in the applicati...

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Problems solved by technology

This method depends on a variety of ideal assumptions, and the accuracy is affected. The biggest problem is that it is only applicable to radar and radiometer systems with similar frequency bands. When it is applied to Ku-band scatterometers (13.5GHz), it can only be equipped with similar frequency bands (18.7GHz) simultaneously. and 37GHz) microwave imaging radiometers can only be applied, which is greatly constrained by the satellite load planning. When the microwave imager for synchronous observation cannot be carried due to the limitation of the satellite platform (such as Fengyun-3E satellite), this method will fail

At the same time, this method is difficult to apply to precipitation measurement radar. Some scholars try to apply it based on the joint iterative solution method combined with radiation transfer, but the correction accuracy is not high

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