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Brightness temperature correction method based on microwave radiometer antenna temperature detection

A microwave radiometer and antenna pattern technology, applied in the field of brightness temperature correction, can solve problems such as low calibration accuracy

Active Publication Date: 2019-11-15
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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  • 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.The working wave band of a microwave radiometer carried by a satellite in a calibration method is in a microwave wave band of 1-1000GHz, and the 3dB beam width of an antenna main beam is less than 0.25 degrees; the calibration method comprises the following steps of step 1, installing a temperature monitoring device on each of an antenna main reflection surface A, auxiliary reflection surfaces BCand a satellite body D; step 2, analyzing the radiation energy ratio of the antenna main reflection surface, the auxiliary reflection surfaces and the satellite body in respective observation ranges;and step 3, calculating the atmospheric brightness temperature TT received by a receiver. The method is high in precision, low in cost and convenient to popularize, and is suitable for being used asa satellite-borne large-caliber antenna microwave radiometer calibration method.

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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IPC IPC(8): G01J5/00
CPCG01J5/00G01J5/80
Inventor 安大伟张志清
Owner NAT SATELLITE METEOROLOGICAL CENT
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