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A Brightness Temperature Correction Method Based on Microwave Radiometer Antenna Temperature Detection

An antenna pattern and antenna technology, applied in radiation pyrometry, optical radiation measurement, measuring devices, etc., can solve the problem of low calibration accuracy

Active Publication Date: 2020-06-12
NAT SATELLITE METEOROLOGICAL CENT
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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem of low calibration accuracy of the brightness temperature correction method of the existing microwave radiometer antenna temperature detection method, and propose a brightness temperature correction method based on the microwave radiometer antenna temperature detection

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  • A Brightness Temperature Correction Method Based on Microwave Radiometer Antenna Temperature Detection

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Embodiment 1

[0087] This embodiment illustrates the specific implementation of a brightness temperature correction method based on microwave radiometer antenna temperature detection in the present invention.

[0088] figure 1 It is a schematic diagram of energy distribution in Step 2 of a brightness temperature correction method based on microwave radiometer antenna temperature detection of the present invention.

[0089] figure 1 A, B, C and D in the figure correspond to the main reflector A of the antenna, the first secondary reflector B, the second secondary reflector C and the satellite body D respectively. Among them, TAij on A is the distribution of temperature detection points TAij on the main antenna reflection surface A, and its antenna pattern is f1; TBij on B is the distribution of temperature detection points TBij on the first secondary reflection surface B, and the antenna pattern is f2; TCij on C is the distribution of temperature detection points TCij on the second seconda...

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Abstract

The invention relates to a brightness temperature correction method based on microwave radiometer antenna temperature detection, and belongs to the technical field of microwave radiometer calibration. In the calibration method, the working band of the microwave radiometer carried by the satellite is in the microwave band 1-1000GHz, and the 3dB beam width of the main beam of the antenna is less than 0.25 degrees; the calibration method comprises the following steps: Step 1, on the main reflection surface of the antenna A, secondary reflector BC and satellite body D install temperature monitoring device; Step 2, analyze the radiation energy ratio of antenna main reflector, secondary reflector and satellite body in their respective observation ranges; Step 3, calculate the receiver received Atmospheric brightness temperature TT. has the advantages of high precision, low cost and easy promotion, and is suitable as a calibration method for spaceborne large-aperture antenna microwave radiometers.

Description

technical field [0001] The invention relates to a brightness temperature correction method based on microwave radiometer antenna temperature detection, and belongs to the technical field of microwave radiometer calibration. Background technique [0002] In the microwave and millimeter wave bands, in order to improve the sufficient spatial resolution to observe the earth, the microwave radiometers carried by satellites have to use large-aperture antennas to reduce the beam width of the antennas. The antenna apertures often reach several meters or even tens of meters. The main reflector and sub-reflector of the antenna will be affected by solar radiation to produce temperature changes, and these temperature changes will affect accurate calibration. Contents of the invention [0003] The purpose of the present invention is to propose a brightness temperature correction method based on microwave radiometer antenna temperature detection for the technical problem of low calibrat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/00
CPCG01J5/00G01J5/80
Inventor 安大伟张志清
Owner NAT SATELLITE METEOROLOGICAL CENT
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