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Calibration device and method for fully polarized microwave radiometer

A microwave radiometer and fully polarized technology, applied in the field of microwave radiometers, can solve the problem that the fully polarized microwave radiometer cannot be satisfied.

Active Publication Date: 2018-12-07
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0009] The above can only be used for horizontally polarized brightness temperature T H and vertically polarized brightness temperature T V Two channels are calibrated, which cannot meet the requirements of the fully polarized microwave radiometer for T 3 , T 4 (stokes parameter) Scaling of the two related channels

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  • Calibration device and method for fully polarized microwave radiometer
  • Calibration device and method for fully polarized microwave radiometer
  • Calibration device and method for fully polarized microwave radiometer

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as figure 1As shown, the present invention proposes a novel fully polarized microwave radiometer calibration device, the calibration device is a polarization calibration source, the polarization calibration source is mainly composed of a polarized wire grid and a microwave black body, the polarization The wire grid is covered on the microwave black body, and the polarized calibration source is used in combination with the non-polarized calibration heat source and the non-polarized calibration cold source (the cold space reflector can be used to replace it in spaceborne) to realize the fully polarized microwave Radiometer calibration.

[0041] When in use, there is periodic relative motion between the polarization calibration source and the antenna and receiving unit of the fully polarized microwave radiometer, that is, the antenn...

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Abstract

The invention discloses a calibration device for a fully polarized microwave radiometer, which is used for calibrating a fully polarized microwave radiometer. The calibration device comprises a non-polarized calibration heat source and a non-polarized calibration cold source. The calibration device further comprises a polarized calibration source, wherein the polarized calibration source includesa polarized wire grating and a microwave blackbody, and the polarized line grating covers the microwave blackbody. The invention further provides a calibration method for the fully polarized microwaveradiometer. The method comprises the steps of obtaining a set of calibration reference brightness temperatures by using the calibration device; determining the gain and offset of horizontal and vertical channels by adopting two-point calibration, and obtaining a brightness temperature TV of the horizontal channel and a brightness temperature TH of the vertical channel; and realizing the calibration for brightness temperatures T3 and T4 of another two channels of full polarization by using the system noise temperature of correlation coefficient of the radiometer by adopting a Y- factor method.The device and method disclosed by the invention can enable the polarization measurement accuracy to reach high requirements and be better than 0.25K so as to solve the problems of coupling and amplitude and phase imbalance between different receiving channels.

Description

technical field [0001] The invention relates to the field of microwave radiometers, in particular to a calibration device and method based on fully polarized microwave radiometers. Background technique [0002] The microwave radiometer detects by receiving electromagnetic radiation or reflection from ground objects, and is a passive microwave remote sensor. Compared with infrared and visible light remote sensors, microwave radiometer has the advantages of longer wavelength and strong penetrating ability, and can work all day and all day, especially suitable for observing geophysical parameters. Microwave radiometers are playing an increasingly important role in Earth observation and daily life. It can be used not only in marine environment monitoring, atmospheric and meteorological observation, agricultural monitoring, geological exploration and military reconnaissance, but also in missile terminal guidance, radio astronomy, medical pathology research and other fields. Mic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01V13/00
CPCG01R35/007G01V13/00
Inventor 李彬王振占佟晓林
Owner NAT SPACE SCI CENT CAS
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