Satellite-borne microwave double-oxygen detection channel equal-weight conjugate rainfall detection method and system

Abstract

The invention discloses a satellite-borne microwave double-oxygen detection channel equal-weight conjugate rainfall detection method and system. The method comprises the steps: inputting 118GHz actualobservation brightness temperature, an instrument scanning angle and surface elevation into a pre-trained clear sky brightness temperature prediction model, and respectively outputting learning brightness temperature of thirteen channels from 50 GHz to 60 GHz; and if the difference between the learning brightness temperature of one channel and the actual observation brightness temperature of thechannel is greater than the rainfall identification threshold of the channel in thirteen channels of 50-60GHz, determining that rainfall cloud pollution exists on the observation pixel of the channel,otherwise, determining that the channel is not influenced by rainfall. According to the method, the data utilization rate is effectively improved, the dependence on window area channel radiation in the temperature observation data application process is eliminated, channel-by-channel rainfall detection of satellite remote sensing temperature detection data in the atmosphere radiation transmissionmeaning is achieved, and the assimilation application accuracy of microwave thermometer data in an atmosphere temperature profile inversion and numerical weather prediction system is improved.

Description

technical field [0001] The invention relates to the field of passive microwave remote sensing, in particular to a method and system for detecting precipitation with equal weight conjugates of satellite-borne microwave double oxygen detection channels. Background technique [0002] Microwave thermometer is a passive microwave remote sensing instrument, which can obtain all-day and all-weather global atmospheric temperature information, and plays an important role in atmospheric detection and ocean observation. Its detection data can be widely used in meteorology, agriculture, forestry, geology, marine environment monitoring and military condition forecasting and so on. [0003] In the past ten years, one of the most important reasons for the rapid improvement of the global numerical prediction quality is the improvement of the initial field of numerical prediction by satellite data assimilation. Among them, the assimilation of spaceborne microwave data, especially microwave ...

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the above-mentioned traditional precipitation detection method which only uses the observation radiation of the window area channel to carry out the precipitation identification problem, and proposes a precipitation detection method based on the radiation characteristics of the temperature detection channel itself.

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