干旱区生态环境知识资源中心(Arid): 星载雷达高度计沙漠散射特性及定标方法研究

Arid

	星载雷达高度计沙漠散射特性及定标方法研究
其他题名	Research on the Backscatter Characteristic and Calibration Methodology of Satellite Radar Altimeter over Desert Surface
	徐曦煜; 刘和光; 杨双宝
来源期刊	遥感技术与应用
ISSN	1004-0323
出版年	2016
卷号	31 期号:5 页码:893-899
中文摘要	为了提高星载雷达高度计海面风速产品的精度并更好地修正海况偏差的影响,有必要对高度计测量的后向散射系数进行定标。分布目标是星载雷达散射系数定标的有效手段,而沙漠的散射特性特别适于高度计的散射系数定标。检验了Jason-2卫星高度计的沙漠回波波形,在澳大利亚辛普森沙漠和我国的塔克拉玛干沙漠选取了适当的区域,收集了在这些区域长达7a的Jason-2高度计数据。基于这些数据,研究了Jason-2卫星雷达高度计在沙漠上的散射系数特性,并提出了基于沙漠的散射系数定标方法,分析了其原理、可行性和试验方案,探讨了高度计和现场定标散射计足迹匹配等关键技术,并对其定标误差进行了分析,论证了沙漠定标场可实现优于0.5dB的定标精度。该方法有助于进一步提升海洋2号(HY-2A)卫星风速和海况偏差产品的质量和应用前景。
英文摘要	>To improve the precision of the satellite altimeter wind speed and sea state bias products,it is necessary to calibrate the backscatter coefficient measured by the radar altimeter.Distributed targets are good candidates in satellite backscatter calibration,and deserts which have constant backscatter characteristic are pretty suitable for the calibration of nadir-looking radar altimeters.In this paper the echo waveforms of Jason- 2altimeter from desert regions were checked and proper areas in the Simpson Desert,Australia and Takla Makan Desert,Xinjiang,China were chosen.Jason-2altimeter data of seven years were collected in these areas.Afterwards,the characteristic of the altimeter backscatter coefficient over desert surface were investigated based on the data prepared,and a method of backscatter coefficient calibration based on the desert areas was proposed.The principle,feasibility and experiment plan were described,the key technologies such as the matching of the altimeter and calibrating scatterometer footprint were discussed,and the calibration errors were analyzed.It was shown that a 0.5dB calibration precision specification could be achieved. The method proposed in this paper would significantly contribute in the HY-2Amission by improving the qualities of wind speed and sea state bias products.
中文关键词	高度计 ; 散射系数 ; 沙漠 ; 定标
英文关键词	Altimeter Backscatter coefficient Desert Calibration
语种	中文
国家	中国
收录类别	CSCD
WOS类目	REMOTE SENSING
WOS研究方向	Remote Sensing
CSCD记录号	CSCD:5844285
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235217
作者单位	中国科学院国家空间科学中心, 中国科学院微波遥感技术重点实验室, 北京 100190, 中国
推荐引用方式 GB/T 7714	徐曦煜,刘和光,杨双宝. 星载雷达高度计沙漠散射特性及定标方法研究[J],2016,31(5):893-899.
APA	徐曦煜,刘和光,&杨双宝.(2016).星载雷达高度计沙漠散射特性及定标方法研究.遥感技术与应用,31(5),893-899.
MLA	徐曦煜,et al."星载雷达高度计沙漠散射特性及定标方法研究".遥感技术与应用 31.5(2016):893-899.