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Mirroring synthetic aperture radiometer inversion method

A comprehensive aperture, radiometer technology, applied in the direction of using re-radiation, reflection/re-radiation of radio waves, instruments, etc., can solve problems such as performance degradation of inversion results

Inactive Publication Date: 2016-02-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0005] The invention provides an image inversion method of a mirror synthetic aperture radiometer, aiming to solve the problem that the performance of the inversion result is degraded by using non-optimal regularization parameters in the existing mirror synthetic aperture inversion method

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Embodiment Construction

[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] The mirror image synthesis aperture microwave radiometer image inversion method provided by the embodiment of the present invention is based on Bayesian regression estimation, which can effectively reduce the computational complexity for the real-time application of mirror image synthesis aperture imaging, and is a method that can automatically select the optimal A method for mirroring synthetic aperture image inversion of the model. This embodiment takes a 16-unit one-dimensional mirrored synthetic aperture array MIAS as an example, including a one-dimensional minimum redundant linear array...

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Abstract

The invention discloses a mirroring synthetic aperture radiometer inversion method. The method comprises the steps of: according to an output cross-correlation value vector R of an MIAS array and an impact response matrix G of the MIAS array, obtaining a probability measurement initial value [beta] of the array output cross-correlation value vector R and a probability measurement initial value [alpha]i of each pixel point Ti of a brightness temperature image; calculating a mean value [mu] of posterior probabilities and a covariance Z of the posterior probabilities, iteratively updating [beta] and [alpha], and judging whether a probability measurement updated value [beta]new of the array output cross-correlation value vector R and a probability measurement updated value [alpha]new of each brightness temperature Ti are simultaneously convergent; if yes, using [mu]=[beta]*Z*G'R obtained by the last iteration as an estimated value of the brightness temperature image T, outputting [mu], and obtaining the brightness temperature image distribution T; and if not, returning, and further calculating [mu] and Z. By adopting the method, the complexity of the calculation for obtaining an optimal model is effectively lowered, and optimal model parameters are automatically selected for brightness temperature inversion; and the method is a novel mirroring synthetic aperture brightness temperature reconstruction method, and the brightness temperature image of an original scene can be effectively reconstructed.

Description

technical field [0001] The invention belongs to the technical field of microwave remote sensing and detection, and more specifically relates to an image inversion method of a mirror image synthetic aperture radiometer (MIAS array). Background technique [0002] The mirror synthetic aperture radiometer is a radiometer system composed of an antenna array, so it is also called MIAS array. The mirror synthetic aperture theory and the mirror synthetic aperture microwave radiation imaging theory MIAS were proposed by Dr. Chen Liangbing of Huazhong University of Science and Technology. This theory is to solve the contradiction between the high resolution of the existing synthetic aperture system and the large system complexity. It adopts a smaller array and a microwave reflector, so that it can be obtained without increasing the number of antenna elements. A higher cosine visibility sampling frequency is used to improve the spatial resolution of the system. The mirror synthetic a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/295
CPCG01S7/295G01S13/90G01S3/02
Inventor 陈柯胡孔勇李青侠桂良启郎量郭伟靳榕
Owner HUAZHONG UNIV OF SCI & TECH