Earth surface influence suppression method based on microwave dual-frequency polarization difference ratio

Abstract

The invention relates to an earth surface influence suppression method based on a microwave dual-frequency polarization difference ratio. The earth surface influence suppression method comprises the following steps: calculating atmospheric transmittance of a 0-200GHz microwave spectrum; selecting a microwave spectrum band suitable for monitoring atmosphere temperature and humidity change characteristics; under the condition of the same earth surface feature, selecting two microwave channels with obvious earth surface emissivity difference under different polarization conditions; calculating the microwave radiation brightness temperature of the same microwave channel under different polarization conditions; calculating microwave radiation brightness temperature difference values of the same microwave channel under different polarization conditions; constructing a dual-frequency polarization difference ratio factor R; and establishing a lookup table of the R and the boundary layer temperature and humidity, and inverting boundary layer temperature and humidity information by using the R. By fine spectrum polarization channel combination, namely, a polarization channel difference value and a ratio of different channels, a new observed quantity R independent of earth surface characteristics is constructed, and inversion of a temperature and humidity profile of a boundary layer (0-4 km) is realized.

Description

technical field [0001] The invention relates to the field of microwave hyperspectral detection and inversion algorithm design, in particular to a ground surface impact suppression method based on microwave dual-frequency polarization difference ratio. Background technique [0002] After half a century of hard work, my country has successfully launched 17 meteorological satellites, 7 of which are currently in orbit, forming a comprehensive earth observation capability that takes into account imaging detection, covering visible infrared microwave and other spectrum bands, and has become the world's largest meteorological satellite with both polar orbit and One of the few countries that has stationary two series of operational meteorological satellites. my country's domestic microwave detection instruments started in the 1960s. my country's second-generation Fengyun meteorological satellite, Fengyun-3, was equipped with two atmospheric microwave detection instruments, including ...

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Problems solved by technology

However, the existing technology lacks an effective method for extracting weak signals in the boundary layer

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