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Antenna cross polarization correction method for satellite-borne polarized related completely-polarized microwave radiometer

A technology of microwave radiometer and correction method, which is applied in the field of microwave remote sensing, and can solve the problems that the cross-polarization correction method cannot be applied

Active Publication Date: 2011-07-27
中国人民解放军理工大学气象学院
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Problems solved by technology

Due to the different receiving systems of traditional radiometers and WindSat, their cross-polarization correction methods cannot be applied
Therefore, for the cross-polarization correction of the space-borne polarization-dependent fully-polarized microwave radiometer, there is no strictly in-orbit operation example for reference, and it is necessary to find a cross-polarization method that can ensure observation accuracy and correction efficiency Correction method

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  • Antenna cross polarization correction method for satellite-borne polarized related completely-polarized microwave radiometer
  • Antenna cross polarization correction method for satellite-borne polarized related completely-polarized microwave radiometer
  • Antenna cross polarization correction method for satellite-borne polarized related completely-polarized microwave radiometer

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Embodiment

[0076] Take 10.7GHz as an example to illustrate the cross-polarization correction process of the satellite-borne correlation type fully polarized microwave radiometer antenna. The present invention uses the atmospheric and ocean environment parameter set obtained by simulation as the earth scene data set for the input of the forward model of fully polarized radiation transmission. Earth scene data set S i As shown in Table 1:

[0077] Table 1 Earth scene data set

[0078]

Sea surface wind speed

Sea wind direction

Sea surface temperature

Water vapor content

Cloud water content

variation range

0-20m / s

0-360°

270-305K

0-70mm

0-0.2mm

Variable interval

1m / s

20°

1K

2mm

0.01mm

[0079] The environmental parameter changes in the data set are within a reasonable range, and a total of 8,820,000 earth scene data sets are generated to generate the corresponding antenna temperature. The spatial distribution of atmospheric and ocean environmental parameters in the earth s...

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Abstract

The invention discloses an antenna cross polarization correction method applicable to a satellite-borne polarized related completely-polarized microwave radiometer. The method comprises the following steps of: re-deducing an antenna temperature equation comprising four Strokes parameters, obtaining a 4*4 cross polarization M matrix by adopting an antenna temperature simulation technology, and finally realizing antenna cross polarization correction for a completely-polarized radiometer which runs on a track. The method is different from cross polarization correction which is performed in an antenna design and optimization stage and is applicable to final correction of the radiometer running on the track. By the method, the antenna cross polarization correction for the satellite-borne polarized related completely-polarized microwave radiometer is realized.

Description

Technical field [0001] The invention belongs to the technical field of microwave remote sensing, and particularly relates to a cross-polarization correction method for a satellite-borne polarization-related full-polarization microwave radiometer antenna. Background technique [0002] The essence of microwave radiometer antenna cross-polarization correction is the process of solving the antenna temperature equation. Because the antenna temperature equation is an ill-conditioned Fredholm integral equation of the first kind, its solution is oscillating and unstable, so obtaining a stable optimal solution is the difficulty of antenna cross-polarization correction. Early traditional dual-polarization radiometer antennas have low main beam efficiency and high antenna temperature contributed by side lobes. Antenna cross-polarization corrections mostly use methods that directly solve integral equations, such as successive approximation methods and Fourier transform methods. Iterative me...

Claims

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Application Information

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IPC IPC(8): G01S7/40
Inventor 严卫陆文施健康黄云仙艾未华
Owner 中国人民解放军理工大学气象学院
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