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遥感技术与应用  2005, Vol. 20 Issue (4): 420-424    DOI: 10.11873/j.issn.1004-0323.2005.4.420
图像处理     
小波离散点插值处理在综合孔径微波辐射计中的应用
傅春霞,吴 季

(1.中国科学院空间科学与应用研究中心,北京  100080;2.中国科学院研究生院,北京  100039)
A Wavelet Based Scattering Data Interpolation in Synthetic Aperture Microwave Radiomter
FU Chun-xia, WU Ji
(1.Center for Space Science and Applied Research,Chinese Academy of Science,Beijing100080,China;
2.Graduate School of Chinese Academy of Sciences,Beijing100039,China)
 全文: PDF 
摘要:

土壤湿度和海水盐度是影响全球气候和水体循环的重要因素,但是对土壤湿度和海水盐度的测量都需要较低的微波测量频率,这时天线孔径和空间分辨率的矛盾就更加突出,而应用综合孔径微波辐射计就是在减小天线孔径和重量的前提下提高空间分辨率的一项新兴的被动微波遥感技术。综合孔径微波辐射计测量的是视场范围内亮温分布对于天线阵中不同基线的干涉天线单元之间的可见度函数分量,根据测得的可见度函数可以反演得到亮温图像。在综合孔径微波辐射计设计中,天线阵列设计和成像反演算法是两项关键技术。提出一种基于小波变换的离散点插值方法,它对二维综合孔径微波辐射计的Fourier成像反演算法进行了修正处理。

关键词: 综合孔径微波辐射计可见度函数小波变换插值成像反演    
Abstract:

Soil moisture and ocean salinity are two important parameters for water cycle and climate change studies. The best way to measure these two parameters is to use microwave radiometer at low frequency band, such as P or L band. However, at these frequencies, the physical size of the antenna is very big in order to reach a modest spatial resolution. To scan such kind of large antenna is also difficult. Further more, if the antenna beam become very narrow, the integration time of each resolution cell will become small which will lead to poor measurement sensitivity.
      To overcome all difficulties mentioned above, the synthetic aperture microwave radiometer technology is proposed. This technology uses both thinned array antenna and electrical scan. Therefore not only the large/heavy antenna aperture problem is solved, but also the integration time will not be related to the spatial resolution any more. It is therefore a very promising technology for low frequency band microwave radiometers and can be implemented for soil moisture and ocean salinity applications.
     The basic concept of synthetic aperture radiometer is to measure spatial frequency of the scene instead of the image itself. The output of the spatial frequency is usually called the visibillity function (VF).While all the spatial frequency outputs or VF are measured, corresponding to all baselines with different length and orientation, the image of the scene is a mathematical transformation of the VF.This paper put forward an interpolation method based on wavelet transform, whose role is to give a modification to the Fourier image reconstruction arithmetic of 2-D microwave synthetic aperture radiometer.

Key words: Synthetic aperture    Microwave radiometer    Wavelet transform    Interpolation    Scattering data
收稿日期: 2005-01-04 出版日期: 2011-10-27
:  TP 732.1  
作者简介: 傅春霞(1979-),女,硕士,主要从事综合孔径微波辐射计成像机理和算法的研究。
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引用本文:

傅春霞,吴 季. 小波离散点插值处理在综合孔径微波辐射计中的应用[J]. 遥感技术与应用, 2005, 20(4): 420-424.

FU Chun-xia, WU Ji. A Wavelet Based Scattering Data Interpolation in Synthetic Aperture Microwave Radiomter. Remote Sensing Technology and Application, 2005, 20(4): 420-424.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2005.4.420        http://www.rsta.ac.cn/CN/Y2005/V20/I4/420

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