Physical Reflectivity and Polarization Characteristics for Snow and Ice-Covered Surfaces Interacting with GPS Signals
文献类型：期刊论文
| 作者 | Najibi, Nasser1,2; Jin, Shuanggen1
|
| 刊名 | REMOTE SENSING
 |
| 出版日期 | 2013-08-01 |
| 卷号 | 5期号:8页码:4006-4030 |
| 关键词 | snow ice reflectivity polarization GPS antenna height satellite elevation angle convolution function |
| 英文摘要 | The Global Positioning System (GPS) reflected signal has been demonstrated to remotely sense the oceans, land surfaces and the cryosphere, including measuring snow depth, soil moisture, vegetation growth and wind direction. Since the Earth surface's characteristics are very complex, the surface reflectivity process and interaction with GPS signals is not well understood. In this study, we investigate the surface's reflectivity and variability of snow and ice surfaces interacting with GPS L1 and L2 signals in order to retrieve multipath signals and infer surface characteristics by using the direct and reflected polarizations of each signal. Firstly, the effects of both GPS satellite elevation angle and GPS receiver's antenna height variations on the multipath signal variability have been investigated by numerical formulations. Secondly, the specular reflection coefficients' features and the total surface polarization for liquid and solid surfaces are discussed. Moreover, the linear polarization and circular polarizations (co-polarized and cross-polarized) as well as their corresponding convolution functions are developed horizontally and vertically. The results show that the multipath signals are more sensitive to the satellite elevation angle variations than to changes in the GPS receiver's antenna height. The convolution function demonstrates that the snowy surface has a minimum reflectance in circular polarization but maximum reflectance in linear polarization. GPS signals reflecting from an ice-covered surface show a maximum value in circular polarization reflectance and a minimum for linear polarization reflectance. Moreover, the values for reflection from soils are between those for snow and ice in all polarization types. The placement of soil surface reflectance values between snowy and icy surface ones may be noteworthy in new remote sensing applications. |
| WOS标题词 | Science & Technology ; Technology |
| 类目[WOS] | Remote Sensing |
| 研究领域[WOS] | Remote Sensing |
| 关键词[WOS] | REFLECTANCE ; MODEL ; AIRBORNE ; SOIL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000328626100016 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/19312]  |
| 专题 | 上海天文台_天文地球动力学研究中心 |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Najibi, Nasser,Jin, Shuanggen. Physical Reflectivity and Polarization Characteristics for Snow and Ice-Covered Surfaces Interacting with GPS Signals[J]. REMOTE SENSING,2013,5(8):4006-4030. |
| APA | Najibi, Nasser,&Jin, Shuanggen.(2013).Physical Reflectivity and Polarization Characteristics for Snow and Ice-Covered Surfaces Interacting with GPS Signals.REMOTE SENSING,5(8),4006-4030. |
| MLA | Najibi, Nasser,et al."Physical Reflectivity and Polarization Characteristics for Snow and Ice-Covered Surfaces Interacting with GPS Signals".REMOTE SENSING 5.8(2013):4006-4030. |
入库方式： OAI收割
来源：上海天文台
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