Satellite-borne dual-polarization millimeter wave radiometer adopting quasi-optic technique

Abstract

The invention provides a satellite-borne dual-polarization millimeter wave radiometer adopting a quasi-optic technique, and is characterized by comprising a parabolic antenna reflecting surface, a feed source, a polarization separator with a waveguide structure and two millimeter wave receivers, wherein the antenna reflecting surface comprises a parabolic primary reflecting surface and a plane secondary reflecting surface which have a certain distance with the parabolic primary reflecting surface; the plane secondary reflecting surface is used for reflecting the horizontal or vertical polarization waves after polarization separation to one millimeter wave receiver; the polarization separator adopts a quasi-optic polarization aperture plate which is formed by fixing metal wires in parallel distribution on a metal frame; g<lambda/2 and d<g, wherein the g represents the spacing between the adjacent metal wires, the d represents the diameter of the metal wires, and the lambda represents the wavelength of the incidence waves; the polarization separator is positioned below the plane secondary reflecting surface; the plane with the polarization separator and the horizontal plane form a certain included angle, and the range of the included angle is 30-60 DEG; and the polarization separator is used for separating the signals which are reflected by the primary reflecting surface into two paths of refraction and reflection signals which respectively enter the two millimeter wave receivers to be processed.

Description

technical field [0001] The invention relates to the technical field of space-borne millimeter-wave radiometers, in particular, the invention relates to a space-borne dual-polarization millimeter-wave radiometer using quasi-optical technology. Background technique [0002] The space-borne millimeter-wave radiometer is a passive microwave remote sensor, which is used for all-day and all-weather observation of global atmospheric temperature and humidity, water vapor content, rainfall and other space weather data. Global climate and environmental changes, realizing medium and long-term numerical weather forecasting, improving the accuracy of weather forecasting, and reducing the loss of life and property caused by disastrous weather phenomena such as typhoons and storms have important application values. [0003] Space-borne millimeter-wave radiometers require high detection accuracy, stable system operation, and high reliability. This radiometer is designed to meet the above re...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the large insertion loss of the polarization separator of the traditional millimeter wave device, and the higher the frequency, the greater the loss, resulting in the decrease of system sensitivity, and the complexity of the internal design of the polarization separator of the waveguide structure The processing precision is very high, and it is easy to cause defects such as mechanical interface mismatch and affect system performance. Therefore, a spaceborne dual-polarization millimeter-wave radiometer using quasi-optical technology is proposed.

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