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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >An FFT-Based CLEAN Deconvolution Method for Interferometric Microwave Radiometers With Spatially Variable Beam Pattern
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An FFT-Based CLEAN Deconvolution Method for Interferometric Microwave Radiometers With Spatially Variable Beam Pattern

机译:具有空间可变光束图案的干涉微波辐射仪的基于FFT基础折叠方法

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摘要

A modification to the extended CLEAN deconvolution method for passive microwave interferometric radiometers is presented to account for the interferometer beam patterns that vary depending on the source position within the interferometer field of view. This method is developed for the newly proposed multisatellite rotating microwave interferometric radiometer concept for geostationary atmospheric sounding, which is found to have a spatially varying beam pattern. The proposed method is implemented by the piecewise application of Fast Fourier Transform (FFT)-based convolution, i.e., the image is divided into discrete segments, where the beam pattern is assumed to be constant within each segment. This approach allows the proposed method to exploit the speed advantage of the FFT. Applying this method to the proposed multisatellite interferometer shows a twofold improvement in the radiometric accuracy of the restored brightness temperature map, as compared with the constant beam pattern CLEAN.
机译:提出了对被动微波干涉辐射射线计的扩展干净解卷积方法的修改,以解释根据干涉仪视场内的源位置而变化的干涉仪波束图案。该方法是为新提出的多卫星旋转微波干涉辐射计概念开发的用于地球静止大气探测,其被发现具有空间变化的光束图案。所提出的方法是通过基于快速傅里叶变换(FFT)的卷积的分段应用来实现,即,图像被分成离散段,其中假设光束图案在每个段内是恒定的。这种方法允许提出的方法利用FFT的速度优势。与恒定光束图案清洁相比,将该方法应用于所提出的多卫星干涉仪,显示出恢复亮度温度图的辐射精度的两倍改善。

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