Satellite-borne terahertz atmospheric limb sounder

Abstract

The invention discloses a satellite-borne terahertz atmospheric limb sounder. The sounder comprises an antenna feed system, a scanning driving mechanism, a calibrator, a receiver, a rear-end spectrometer, and a digital control unit, wherein the antenna feed system is used to receive atmospheric limb radiation signals and radiation signals of the calibrator and send the signals to the receiver, andcomprises an offset paraboloid reflecting antenna and independent feed sources for four frequencies; the scanning driving mechanism is used to drive the antenna feed system to achieve one-dimensionalreciprocating oscillation and complete atmospheric limb scanning in a direction parallel to a satellite traveling direction; the receiver comprises four sounding channels, and each sounding channel carries out down-conversion, amplification and filtering on radiation signals of one feed source; the rear-end spectrometer is used for spectral analysis on signals output by the sounding channels of the receiver, so that inversion of the contents and vertical distributions of various atmospheric components can be subsequently achieved; and the digital control unit is used to control the working state of the whole sounder.

Description

technical field [0001] The invention relates to an atmospheric limb detector in the field of microwave remote sensing technology, in particular to a spaceborne terahertz atmospheric limb detector. Background technique [0002] Terahertz atmospheric limb detection technology can be used to monitor ozone and detect the global distribution and aerosol concentration distribution of atmospheric ozone layer, greenhouse effect trace gases, trace gases that have important influences in tropospheric and stratospheric ozone chemistry, etc. The compositional changes of various atmospheric trace gases and their effects on the radiation budget and atmospheric state parameters can be studied, which helps scientists understand the long-distance transport of pollutants and their complexity, and better understand how the hole in the ozone layer affects future advection In response to the cooling of the stratosphere, it provides scientists with a new understanding of the physical and chemical...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the existing atmospheric limb detectors such as large frequency division and insertion loss, high error and backward spectrum analysis technology, and to provide a brand-new design of the atmospheric limb detector. The terahertz atmospheric limb detector has The antenna feed system adopts a single reflector plus a discrete feed source, the integrated design of the receiver, and the use of digital spectrometers for spectrum analysis of the detection channels.

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