SPECKLE STATISTICS IN 4-LOOK SYNTHETIC APERTURE RADAR IMAGERY

被引：9

作者：

APRIL, GV ^{[1
]}

HARVEY, ER ^{[1
]}

机构：

[1] UNIV LAVAL,CTR OPT PHOTON & LASER,QUEBEC CITY G1K 7P4,QUEBEC,CANADA

来源：

OPTICAL ENGINEERING | 1991年 / 30卷 / 04期

关键词：

SPECKLE; SPECKLE STATISTICS; SYNTHETIC APERTURE RADAR IMAGERY;

D O I：

10.1117/12.55816

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Speckle noise in high-resolution synthetic aperture radar (SAR) images is generated by the coherent processing of radar signals and exists in all types of coherent imaging systems. We study the statistical properties of speckle noise in a four-look SEASAT SAR image concentrating on homogeneous areas of the image. Experimental determination of the signal-to-noise ratio and of the probability density of the recorded intensity is performed showing evidence of correlation between underlying looks. Based on a model taking into account the weighting and possible correlation between the underlying looks, a theoretical expression for the effective number of independent looks is proposed and the corresponding probability density function of the intensity is compared to the experimentally extracted histograms of intensity fluctuations.

引用

页码：375 / 381

页数：7

共 19 条

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