Inversion for atmosphere duct parameters using real radar sea clutter

	Inversion for atmosphere duct parameters using real radar sea clutter
	Sheng Zheng; Fang Han-Xian
刊名	CHINESE PHYSICS B
	2012
卷号	21 期号:2 页码:29301
关键词	atmosphere duct radar clutter refractivity from clutter genetic algorithm
ISSN号	1674-1056
通讯作者	Fang, HX (reprint author), PLA Univ Sci & Technol, Inst Meteorol, Nanjing 211101, Jiangsu, Peoples R China.
中文摘要	This paper addresses the problem of estimating the lower atmospheric refractivity (M profile) under nonstandard propagation conditions frequently encountered in low altitude maritime radar applications. The vertical structure of the refractive environment is modeled using five parameters and the horizontal structure is modeled using five parameters. The refractivity model is implemented with and without a priori constraint on the duct strength as might be derived from soundings or numerical weather-prediction models. An electromagnetic propagation model maps the refractivity structure into a replica field. Replica fields are compared with the observed clutter using a squared-error objective function. A global search for the 10 environmental parameters is performed using genetic algorithms. The inversion algorithm is implemented on the basis of S-band radar sea-clutter data from Wallops Island, Virginia (SPANDAR). Reference data are from range-dependent refractivity profiles obtained with a helicopter. The inversion is assessed (i) by comparing the propagation predicted from the radar-inferred refractivity profiles with that from the helicopter profiles, (ii) by comparing the refractivity parameters from the helicopter soundings with those estimated. This technique could provide near-real-time estimation of ducting effects.
英文摘要	This paper addresses the problem of estimating the lower atmospheric refractivity (M profile) under nonstandard propagation conditions frequently encountered in low altitude maritime radar applications. The vertical structure of the refractive environment is modeled using five parameters and the horizontal structure is modeled using five parameters. The refractivity model is implemented with and without a priori constraint on the duct strength as might be derived from soundings or numerical weather-prediction models. An electromagnetic propagation model maps the refractivity structure into a replica field. Replica fields are compared with the observed clutter using a squared-error objective function. A global search for the 10 environmental parameters is performed using genetic algorithms. The inversion algorithm is implemented on the basis of S-band radar sea-clutter data from Wallops Island, Virginia (SPANDAR). Reference data are from range-dependent refractivity profiles obtained with a helicopter. The inversion is assessed (i) by comparing the propagation predicted from the radar-inferred refractivity profiles with that from the helicopter profiles, (ii) by comparing the refractivity parameters from the helicopter soundings with those estimated. This technique could provide near-real-time estimation of ducting effects.
学科主题	空间物理
收录类别	SCI
资助信息	National Natural Science Foundation of China [41105013]; Natural Science Foundation of Jiangsu Province, China [BK2011122]; Specialized Research Fund for State Key Laboratories, China [201120FSIC-03]
语种	英语
公开日期	2014-12-15
内容类型	期刊论文
源URL	[http://ir.nssc.ac.cn/handle/122/3167]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Sheng Zheng,Fang Han-Xian. Inversion for atmosphere duct parameters using real radar sea clutter[J]. CHINESE PHYSICS B,2012,21(2):29301.
APA	Sheng Zheng,&Fang Han-Xian.(2012).Inversion for atmosphere duct parameters using real radar sea clutter.CHINESE PHYSICS B,21(2),29301.
MLA	Sheng Zheng,et al."Inversion for atmosphere duct parameters using real radar sea clutter".CHINESE PHYSICS B 21.2(2012):29301.