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Mirror Synthetic Aperture Radiometer Imaging Method Based on Reflector Combination

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: 2020-07-28
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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  • Mirror Synthetic Aperture Radiometer Imaging Method Based on Reflector Combination
  • Mirror Synthetic Aperture Radiometer Imaging Method Based on Reflector Combination
  • Mirror Synthetic Aperture Radiometer Imaging Method Based on Reflector Combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094]Example 1: Scene brightness temperature image obtained by simulating a 24-unit double L array

[0095] In this example, Figure 7 The array used in the simulation is a 24-unit 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 is composed of an extended source, which is used to simulate land, ocean, and cold air.

[0096] Specific steps are as follows:

[0097] (1) For the 24-unit double-L array, set the distance between the reflector and the first antenna of the antenna array to be 0.5λ, and only place the reflector in the x direction to obtain a linear equation set composed of correlation functions output by the antenna array;

[0098] (2) increase the reflector in the y direction to obtain the linear equations formed by the correlation function output by the antenna array;

[0099] (3) Remove the reflector in the x direction to obtain the linear equatio...

Embodiment 2

[0104] Example 2: The brightness temperature image of the electric heater scene obtained from the experiment

[0105] In this embodiment, the imaging method of reflecting plate combination is experimentally verified, Figure 11 The array used in the experiment is a 24-unit double L array. Figure 12 The target scene for testing is an electric heater.

[0106] Specific steps are as follows:

[0107] (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 equations composed of the correlation functions output by the antenna array;

[0108] (2) increase the reflector in the y direction to obtain the linear equations formed by the correlation function output by the antenna array;

[0109] (3) Remove the reflector in the x direction to obtain the linear equations formed by the correlation functions output by the antenna array;

[0110] (...

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Abstract

The invention discloses an imaging method for a mirrored synthetic aperture radiometer based on a reflection plate combination, which comprises: a first linear equation group composed of a first correlation function output by the antenna array according to the antenna array and a reflection plate in the x direction; Obtain the second linear equation group composed of the second correlation function output by the antenna array with the reflector in the x direction and the y direction; obtain the third linear equation composed of the third correlation function output by the antenna array according to the reflector in the antenna array and the y direction group; combine the three linear equations to obtain the target linear equations containing the scene brightness temperature image information; obtain the cosine visibility function by solving the target linear equations containing the scene brightness temperature image information; use the cosine visibility function to perform inverse cosine transformation, Reconstruct the scene brightness temperature image. The invention improves the accuracy of the cosine visibility function, thereby improving the imaging quality.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and detection, and more specifically relates to an imaging method of a mirror image synthetic aperture radiometer based on a reflection plate combination. Background technique [0002] The synthetic aperture radiometer synthesizes multiple small antennas into an equivalent large antenna aperture, and arranges them in a sparse array, which reduces the weight and volume of the antenna, and solves 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 synthetic aperture radiometer systems, such as spaceborne synthetic aperture radiometers. [0003] Mirrored aperture synthetic radiometers can be used to reduce the number of antenna elements or to increase spatial resolution. Compared with the synthetic aperture radiometer, in the case of the same number of antennas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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