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Reflection-board-combination-based imaging method of mirror-image synthetic aperture radiometer

A technology that integrates aperture and imaging methods, applied in the direction of radio wave reflection/re-radiation, using re-radiation, and direction finders using radio waves, etc., which can solve poor imaging quality, rank deficiency of linear equations, and accuracy of cosine visibility Low-level problems, to achieve the effect of improving accuracy and improving imaging quality

Active Publication Date: 2018-08-07
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a mirrored synthetic aperture radiometer imaging method based on the combination of reflectors, thereby solving the problem of rank deficiency of linear equations, low accuracy of cosine visibility, and Technical issues with poor image quality

Method used

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  • Reflection-board-combination-based imaging method of mirror-image synthetic aperture radiometer
  • Reflection-board-combination-based imaging method of mirror-image synthetic aperture radiometer
  • Reflection-board-combination-based imaging method of mirror-image synthetic aperture radiometer

Examples

Experimental program
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Effect test

Embodiment 1

[0095] Example 1: Scene brightness temperature image obtained by simulating a 24-unit double-L array

[0096] In this example, Figure 7 For the array used in the simulation, it is a 24-element double-L array, adding system noise (bandwidth 200M, integration time 0.32s, channel noise 300K). Figure 8 The ideal scene brightness temperature image for testing consists of an exhibition source, which is used to simulate land, ocean, and cold air.

[0097] Specific steps are as follows:

[0098] (1) For the 24-element double-L array, the distance between the reflector and the first antenna of the antenna array is set to 0.5λ, and only the reflector in the x direction is placed to obtain the linear equation system formed by the correlation function output by the antenna array;

[0099] (2) Add a reflector in the y direction to obtain a linear equation system composed of the correlation function output by the antenna array;

[0100] (3) Remove the reflector in the x-direction, and ob...

Embodiment 2

[0105] Example 2: Bright temperature image of electric heater scene obtained by experiment

[0106] In this embodiment, experimental verification is carried out for the imaging method of reflecting plate combination, Figure 11 The array used in the experiment is a 24-unit double-L array. Figure 12 For the target scene for testing, it is an electric heater.

[0107] Specific steps are as follows:

[0108] (1) For the 24-element double-L array, the distance between the reflector and the first antenna of the antenna array is 0.5λ, and only the reflector in the x direction is placed to obtain the linear equation system composed of the correlation function output by the antenna array;

[0109] (2) Add a reflector in the y direction to obtain a linear equation system composed of the correlation function output by the antenna array;

[0110] (3) Remove the reflector in the x-direction, and obtain the linear equation system composed of the correlation function output by the anten...

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Abstract

The invention discloses a reflection-board-combination-based imaging method of a mirror-image synthetic aperture radiometer. The method comprises: according to an antenna array and an x-direction reflection board, a first linear equation group formed by first correlation functions outputted by an antenna array; on the basis of the antenna array and reflection boards in the x direction and y direction, a second linear equation group formed by second correlation functions outputted by the antenna array is obtained; on the basis of the antenna array and the reflection board in the y direction, athird linear equation formed by third correlation functions outputted by the antenna array; the three linear equation groups are combined to obtain a target linear equation group including scene brightness temperature image information; the target linear equation group including scene brightness temperature image information is calculated to obtain a cosine visibility function; and with the cosinevisibility function, inverse cosine transform is carried out to rebuild a scene brightness temperature image. Therefore, the accuracy of the cosine visibility function is improved and thus the imaging quality is enhanced.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and detection, and more particularly relates to an imaging method of a mirror image synthetic aperture radiometer based on a combination of reflectors. Background technique [0002] The synthetic aperture radiometer combines multiple small antennas into an equivalent large antenna aperture, and adopts a sparse array arrangement, which reduces the weight and volume of the antenna and resolves the inherent contradiction between resolution and aperture size. But this advantage comes at the cost of system structure and signal processing complexity, especially in large SAR systems, such as spaceborne SAR. [0003] Mirrored Synthetic Aperture Radiometers can be used to reduce the number of antenna elements or to improve spatial resolution. Compared with the synthetic aperture radiometer, under the same number of antennas, the mirrored synthetic aperture radiometer can obtain more spati...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S3/02
Inventor 李青侠窦昊锋桂良启李育芳吴袁超雷振羽
Owner HUAZHONG UNIV OF SCI & TECH
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