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A self-calibrating near-field imaging method and system based on a two-unit scanning interferometer

A scanning interference and near-field imaging technology, applied in radio wave measurement systems, instruments, radio wave reflection/re-radiation, etc., can solve problems such as phase errors that cannot be solved, and achieve fast imaging speed, simple operation, and computational complexity. low effect

Active Publication Date: 2022-03-08
NAT SPACE SCI CENT CAS
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AI Technical Summary

Problems solved by technology

However, the existing near-field imaging method is a near-field imaging method based on a reference point source, which cannot solve the technical problem of phase error in the above-mentioned two-unit scanning interferometer.

Method used

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  • A self-calibrating near-field imaging method and system based on a two-unit scanning interferometer
  • A self-calibrating near-field imaging method and system based on a two-unit scanning interferometer
  • A self-calibrating near-field imaging method and system based on a two-unit scanning interferometer

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Embodiment 1

[0130] The two-unit scanning interferometer in this example uses the movement of the receiver placed on the carriage in both horizontal and vertical directions to generate different baselines on the carriage, and all the baselines form a lattice of rectangular grid distribution, which is equivalent to The effect of sampling on a T-shaped antenna array.

[0131] Next, the near-field target imaging experiment is carried out using the two-unit interferometer. Use the two-unit interferometer to detect the small sun (heater) with an observation distance of 5.5m in the dark room, use two receivers to perform complex correlation calculation on the sampled data received by the two antenna units, and obtain the corresponding The visibility function VF of the visibility function value of , the phase of VF corresponding to v=0 is as follows figure 2 shown. The brightness temperature image results reconstructed based on the visibility function VF, such as image 3 shown.

[0132] fro...

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Abstract

The invention belongs to the technical field of near-field target detection and imaging, and relates to a self-calibration near-field imaging method based on a two-unit scanning interferometer. Perform complex correlation operation on the data to obtain the visibility function value corresponding to each baseline, and generate a visibility function value set as the visibility function; perform receiver channel phase error correction and near Field phase error correction to obtain the near-field error-corrected visibility function; based on the Fourier transform relationship between the two-dimensional brightness temperature image of the near-field field of view to be observed and the near-field error-corrected visibility function, Taking the two-dimensional brightness temperature image of the near-field field of view to be observed as the input variable, using the visibility function corrected by the near-field error, according to different antenna array configurations, different fast inverse Fourier transform algorithms are used to perform image reflection. to obtain the brightness temperature image of the near-field observation field.

Description

technical field [0001] The invention belongs to the technical field of passive microwave remote sensing and near-field target detection and imaging, and in particular relates to a self-calibrating near-field imaging method and system based on a two-unit scanning interferometer. Background technique [0002] The interferometric synthetic aperture radiometer is one of the main technical means to realize microwave radiation measurement in the field of passive microwave remote sensing. The system obtains the visibility function by measuring the spatial frequency domain distribution of the brightness temperature of the observed scene. Then, the Fourier transform relationship between the brightness temperature distribution of the observed scene and the visibility function is used to reconstruct the brightness temperature distribution of the observed scene. Compared with the traditional real aperture radiometer, the biggest advantage of the interferometric synthetic aperture micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/40
CPCG01S13/9023G01S13/9056G01S7/40
Inventor 周燕晖刘浩张成
Owner NAT SPACE SCI CENT CAS