Initial results of China's GNSS-R airborne campaign: soil moisture retrievals

	Initial results of China's GNSS-R airborne campaign: soil moisture retrievals
	Wan, Wei 1; Bai, Weihua 1; Zhao, Limin 1; Long, Di 1; Sun, Yueqiang 1; Meng, Xiangguang 1; Chen, Hua 1; Cui, Xiai 1; Hong, Yang 1
刊名	SCIENCE BULLETIN
	2015
卷号	60 期号:10 页码:445-453
关键词	GNSS-R Soil moisture Airborne campaign The Yellow River GPS
通讯作者	Zhao, LM (reprint author), Chinese Acad Sci, Inst Remote Sensing & Digital Earth, Beijing 100101, Peoples R China.
英文摘要	The global navigation satellite system reflectometry (GNSS-R) technique has been proven to be a powerful tool for retrieving geophysical parameters of ocean and land/hydrology processes. The ultimate goal for such GNSS-R applications is to achieve large-scale, all-weather, and full-time mapping using spaceborne platforms. In order to ensure both GNSS-R receiver and algorithm meet the requirements of spaceborne observations, airborne experimental campaigns need to be first carried out for early testing and validation purposes. This paper presents a first comprehensive overview of China's airborne GNSS-R campaign conducted on May 30, 2014. There were two objectives for this campaign: (1) to examine the capability of the GNSS-R receiver developed by the National Space Science Center, Chinese Academy of Sciences, for airborne observations and (2) to study algorithms for soil moisture and altimetry retrievals. In this paper, initial results of soil moisture retrievals are presented. The left-hand circularly polarized-predominant satellite information was successfully used to retrieval soil moisture over the cropland. The right-hand circularly polarized components of the reflected signals were also received and examined. The GPS-derived soil moisture results, on the one hand, correctly represented the spatial variations of the soil moisture along the tracking of the flight; on the other hand, the results underestimated the ground-truth. Errors from the retrieval model and from the positioning and effects from the vegetation layer and from the atmospheric water vapor were the primary causes of the uncertainties in soil moisture retrievals using the airborne GNSS-R data. This airborne experimental campaign firstly investigate that China has the capability to perform airborne GNSS-R observation using the self-developed receiver, although the receiver developed by the NSSC needs to be further examined for its capability for spaceborne observation. The early findings of this study will provide illustrations for planned future airborne campaigns.
研究领域[WOS]	Multidisciplinary Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000354640900009
内容类型	期刊论文
源URL	[http://ir.ceode.ac.cn/handle/183411/38445]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	1.[Wan, Wei 2.Long, Di 3.Hong, Yang] Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China 4.[Wan, Wei 5.Long, Di 6.Hong, Yang] Tsinghua Univ, Dept Hydraul Engn, Beijing 100084, Peoples R China 7.[Bai, Weihua 8.Sun, Yueqiang 9.Meng, Xiangguang 10.Chen, Hua] Chinese Acad Sci, Natl Space Sci Ctr, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wan, Wei,Bai, Weihua,Zhao, Limin,et al. Initial results of China's GNSS-R airborne campaign: soil moisture retrievals[J]. SCIENCE BULLETIN,2015,60(10):445-453.
APA	Wan, Wei.,Bai, Weihua.,Zhao, Limin.,Long, Di.,Sun, Yueqiang.,...&Hong, Yang.(2015).Initial results of China's GNSS-R airborne campaign: soil moisture retrievals.SCIENCE BULLETIN,60(10),445-453.
MLA	Wan, Wei,et al."Initial results of China's GNSS-R airborne campaign: soil moisture retrievals".SCIENCE BULLETIN 60.10(2015):445-453.