An Improved Adaptive Regularization Method for Forward Looking Azimuth Super-Resolution of a Dual-Frequency Polarized Scatterometer

	An Improved Adaptive Regularization Method for Forward Looking Azimuth Super-Resolution of a Dual-Frequency Polarized Scatterometer
	Liu, Liling; Dong, Xiaolong; Zhu, Jintai; Zhu, Di
	2016
会议名称	IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
会议日期	JUL 26-31, 2015
会议地点	Milan, ITALY
关键词	Azimuth super-resolution dual-frequency polarized scatterometer (DFPSCAT) reconstruction accuracy snow water equivalent (SWE)
页码	2145-2159
通讯作者	Dong, XL (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, Key Lab Microwave Remote Sensing, Beijing 100190, Peoples R China.
英文摘要	Dual-frequency polarized scatterometer (DFPSCAT) is a pencil-beam rotating scatterometer which is designed for snow water equivalent (SWE) measurement, and Doppler beam sharpening (DBS) technique is proposed for DFPSCAT to achieve the azimuth resolution. However, the DBS technique is inapplicable for the forward-looking and afterward-looking regions. Based on an approximate aperiodic model of scatterometer echo signal, an improved adaptive regularization deconvolution algorithm with gradient histogram preservation (GHP) constraint is implemented to settle the problem. To investigate its performance of resolution enhancement and resulted accuracy, both a synthetic backscattering coefficient (sigma(0)) field reconstruction and SWE sigma(0) reconstruction are carried out. The results show that the proposed method can recover the truth signal and achieve azimuth resolution of 2 km with the designed scatterometer system, which is required by the SWE retrieval. Moreover, the relative errors of reconstructed sigma(0) are less than 0.5 dB that satisfy the accuracy requirement for SWE retrieval, and comparisons with observed results show that the error reduction is more than 0.03 dB. Meanwhile, a comparison between the proposed algorithm and some existing resolution enhancement methods is analyzed, which concludes that the proposed method can obtain a comparable resolution enhancement as L-1 method and has less noise. The technique is also verified with advanced scatterometer (ASCAT) scatterometer data.
收录类别	CPCI
会议主办者	IEEE
会议录	IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
会议录出版者	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
语种	英语
ISSN号	1939-1404
内容类型	会议论文
源URL	[http://ir.nssc.ac.cn/handle/122/5560]
专题	国家空间科学中心_微波遥感部
推荐引用方式 GB/T 7714	Liu, Liling,Dong, Xiaolong,Zhu, Jintai,et al. An Improved Adaptive Regularization Method for Forward Looking Azimuth Super-Resolution of a Dual-Frequency Polarized Scatterometer[C]. 见:IEEE International Geoscience and Remote Sensing Symposium (IGARSS). Milan, ITALY. JUL 26-31, 2015.