Variable-temperature source device for full-polarization microwave radiometers

Abstract

The invention relates to a variable-temperature source device for full-polarization microwave radiometers. The variable-temperature source device comprises a cold source, a heat source, a polarization grid and a phase delay board the center points of which are positioned on the same horizontal surface, wherein the cold source is used for providing a low brightness temperature; the heat source is used for providing a high brightness temperature; the polarization grid is used for outputting a variable linear polarization microwave radiation brightness temperature; the phase delay board is used for outputting a variable circular polarization microwave radiation brightness temperature; the cold source and the heat source are respectively arranged on both sides of the polarization grid; the center of the polarization grid, the center of the phase delay board, and the center of a microwave radiometer test antenna are on the central axis of the system; and the phase delay board is perpendicular to the central axis of the system. The invention is characterized in that the polarization grid can rotate by using the central axis perpendicular to the plane in which the polarization grid is positioned as the center; and the phase delay board can rotate by using the central axis perpendicular to the plane in which the phase delay board is positioned as the center. The invention has the advantage of that calibration and testing can be carried out by the full-polarization microwave radiometer rapidly.

Description

technical field [0001] The invention relates to a variable temperature source device of a microwave radiometer, in particular to a variable temperature source device of a fully polarized microwave radiometer. Background technique [0002] The fully polarized microwave radiometer is a new type of passive microwave remote sensor, which can realize the global all-day, all-weather observation of the ocean, which can be used to establish the ocean circulation, the exchange mechanism of air and sea water, and the atmospheric model. Compared with the traditional dual-polarization microwave radiometer, the full-polarization microwave radiometer can measure four Stokes parameters of the target at one time, which is another powerful method for target feature extraction. [0003] Whether it is a ground, airborne or spaceborne full-polarization microwave radiometer, a variable temperature source is required during debugging and calibration, so that the receiver can be debugged and calib...

AI Technical Summary

Problems solved by technology

In addition, it is necessary to solve the problem of inconvenient and quick operation of the existing fully polarized microwave radiometer

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