Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data

doi:10.1007/s13131-015-0601-3

	Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data
	Wang Yunhua 1; Liu Xiaoyan 1; Li Huimin 1; Zhang Yanmin 2,3
刊名	ACTA OCEANOLOGICA SINICA
	2015-01
卷号	34 期号:1 页码:85-93
关键词	azimuth ambiguities polarimetric SAR CFAR detection algorithm
ISSN号	0253-505X
DOI	10.1007/s13131-015-0601-3
英文摘要	Azimuth ambiguities (ghost targets) discrimination is of great interest with the development of a synthetic aperture radar (SAR). And the azimuth ambiguities are often mistaken as actual targets and cause false alarms. For actual targets, HV channel signals acquired by a fully polarimetric SAR are approximately equal to a VH channel in magnitude and phase, i.e., the reciprocity theorem applies, but shifted in phase about +/-pi for the first-order azimuth ambiguities. Exploiting this physical behavior, the real part of the product of the two cross-polarized channels, i.e. (S (HV) S (VH)*), hereafter called A (12r), is employed as a new parameter for a target detection at sea. Compared with other parameters, the contrast of A (12r) image between a target and the surrounding sea surface will be obviously increased when A (12r) image is processed by mean filtering algorithm. Here, in order to detect target with constant false-alarm rates (CFARs), an analytical expression for the probability density function (pdf) of A (12r) is derived based on the complex Wishart-distribution. Because a value of A (12r) is greater/less than 0 for real target/its azimuth ambiguities, the first-order azimuth ambiguities can be completely removed by this A (12r)-based CFAR technology. Experiments accomplished over C-band RADARSAT-2 fully polarimetric imageries confirm the validity.
资助项目	National Natural Science Foundation of China[41376179] ; National Natural Science Foundation of China[41106153]
WOS关键词	AZIMUTH AMBIGUITIES ; IMAGERY ; STATISTICS ; REMOVAL
WOS研究方向	Oceanography
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000347679900012
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/27428]
专题	自然资源部第一海洋研究所
通讯作者	Wang Yunhua
作者单位	1.Ocean Univ China, Ocean Remote Sensing Inst, Qingdao 266100, Peoples R China 2.Ocean Univ China, Coll Informat Sci & Engn, Qingdao 266100, Peoples R China 3.First Inst Oceanog, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Wang Yunhua,Liu Xiaoyan,Li Huimin,et al. Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data[J]. ACTA OCEANOLOGICA SINICA,2015,34(1):85-93.
APA	Wang Yunhua,Liu Xiaoyan,Li Huimin,&Zhang Yanmin.(2015).Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data.ACTA OCEANOLOGICA SINICA,34(1),85-93.
MLA	Wang Yunhua,et al."Targets detecting in the ocean using the cross-polarized channels of fully polarimetric SAR data".ACTA OCEANOLOGICA SINICA 34.1(2015):85-93.