Calibration source microwave window of microwave radiometer

Abstract

The invention discloses a calibration source microwave window of a microwave radiometer. The calibration source microwave window comprises a tapered gradual change array (1), a tapered hollow gradual change array (2) and a fastening frame (3), wherein the tapered hollow gradual change array (2) is formed by combining 2*n subunits; the tapered gradual change array (1) is molded by integrally machining a whole piece of polystyrene; and the fastening frame (3) is molded by integrally machining polystyrene. 2*n subunits are arranged together so as to form the tapered hollow gradual change array (2); a bright temperature signal radiated from a microwave radiator firstly passes through the tapered hollow gradual change array (2) which is tightly contacted with the microwave radiator, subsequently passes through the tapered gradual change array (1), and finally reaches an outfit plane of the calibrated radiometer so as to accomplish the calibration of the radiometer. The calibration source microwave window has the characteristics of good heat insulation effect, flexible combination mode and strong generality; and moreover, the smooth transition from air characteristic impedance to polystyrene characteristic impedance is achieved; and the measurement error of reflection coefficient of the radiator is reduced effectively.

Description

technical field [0001] The invention relates to a calibration source microwave window, in particular to a microwave radiometer calibration source microwave window. Background technique [0002] With the continuous development of my country's major aerospace science and technology projects represented by high-resolution earth observation and lunar exploration projects, a large number of microwave radiometers have been carried on "Fengyun-3", "Ocean-2", "Chang'e-1", On satellite-based platforms such as "Chang'e-2", my country's microwave passive remote sensing has achieved a leap from scientific experiment type to business application type. The microwave radiometer is essentially a high-sensitivity receiver that passively receives the temperature radiation of natural objects. Because microwave itself has the ability to penetrate clouds, fog, light rain, vegetation and soil, the microwave radiometer has the irreplaceable detection ability of other frequency band remote sensing ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a microwave window for the calibration source of a microwave radiometer, which solves the problems of unsatisfactory filling uniformity, poor versatility and flexibility, and large emissivity measurement error of the microwave window formed in the traditional way.

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