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One-dimensional interference-type microwave radiometer image reconstruction method

A microwave radiometer and interferometric technology, which is applied in the field of radiometer imaging, can solve problems such as large antenna pattern errors, and achieve the effect of improving accuracy and avoiding brightness temperature inversion errors.

Active Publication Date: 2016-11-09
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that the existing one-dimensional interferometric microwave radiometer image inversion method will introduce large antenna pattern errors, thereby providing a method that can effectively improve the accuracy of inversion target brightness temperature

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[0042] The present invention will be further described now in conjunction with accompanying drawing.

[0043] In the following embodiments, the one-dimensional interferometric microwave radiometer image inversion method of the present invention is illustrated by taking the ocean salinity measurement system of the spaceborne L-band as an example. In other embodiments, the method of the present invention can also be used for One-dimensional interferometric microwave radiometer measurement system for other bands.

[0044] The one-dimensional interferometric microwave radiometer image inversion method of the present invention can be specifically described as:

[0045] Step 101), measuring the two-dimensional antenna pattern of each unit antenna in the one-dimensional interferometric microwave radiometer, and sparsely arranging the antenna unit array to form a baseline coverage that meets imaging requirements.

[0046] Step 102), performing amplitude normalization processing on th...

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Abstract

The invention relates to a one-dimensional interference-type microwave radiometer image reconstruction method. The method comprises steps: a two-dimensional antenna pattern of each unit antenna in the one-dimensional interference-type microwave radiometer is measured, and sparse arrangement is carried out on an antenna unit array to form baseline coverage meeting imaging requirements; the two-dimensional antenna pattern is converted to a one-dimensional antenna pattern, and the one-dimensional antenna pattern obtained through conversion is used for calculating and acquiring a measurement system response matrix for the one-dimensional interference-type microwave radiometer; and according to the measurement system response matrix for the one-dimensional interference-type microwave radiometer and a visibility function after measurement and calibration by the system, image reconstruction is carried out to obtain a high-precision brightness temperature image.

Description

technical field [0001] The invention relates to the field of radiometer imaging, in particular to a one-dimensional interferometric microwave radiometer image inversion method. Background technique [0002] The measurement principle of the interferometric synthetic aperture microwave radiometer is different from the traditional true aperture microwave radiation measurement. It is not a direct measurement of brightness temperature in the spatial domain, but an indirect measurement. The interferometric microwave radiometer first measures the spatial spectrum of the target, and then inverts the brightness temperature information of the target through Fourier transform. [0003] Due to the above-mentioned indirect measurement method, the brightness temperature measurement error of the interferometric synthetic aperture microwave radiometer not only comes from the error of the hardware system itself, but also comes from the inversion from the original measurement data in the spa...

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Application Information

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IPC IPC(8): G01J5/60
CPCG01J5/60G01K11/006
Inventor 武林刘浩金梦彤张成吴季
Owner NAT SPACE SCI CENT CAS
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