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摘要:
GNSS-R是利用导航卫星的反射信号对地物参数进行遥感的新兴对地观测方式。针对其特有的圆极化散射方式,以双站散射的高级积分方程模型为工具,利用极化合成的方法将随机粗糙地表面圆极化散射模型转换为可以计算各种极化的微波散射模型。重点模拟分析了不同土壤水分含量下,裸土在不同观测几何时的圆极化散射特性。随机粗糙地表面圆极化散射模型的发展在某种程度上填补了GNSS-R领域机理模型的空缺,为后续土壤水分的进一步反演提供了机理工具。
Abstract:GNSS-R is a new way of earth observation that uses the reflected signals of navigation satellites to remotely sense the geophysical parameters. Its unique feature is the circular polarization scattering. This paper employs the advanced integral equation model of bistatic scattering as a tool, and uses polarization synthesis to convert the random rough surface scattering model into a microwave scattering model that can calculate various polarizations. Simulation and analysis of the circular polarization scattering characteristics of bare soil under different observation geometries and different soil moisture contents are carried out. To some extent, the development of the random rough surface circular polarization scattering model fills the gap in the GNSS-R mechanism, and provides a tool for the subsequent further inversion of soil moisture.
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Key words:
- GNSS-R /
- soil moisture /
- polarization /
- random rough surface scattering model /
- observation geometry
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[1] WOOD E F.Global scale hydrology:Advances in land surface modeling[J].Reviews of Geophysics, 1991, 29(S1):193-201. doi: 10.1002/rog.1991.29.s1.193 [2] KERR Y H, WALDTEUFEL P, WIGNERON J P, et al.Soil moisture retrieval from space:The soil moisture and ocean salinity (SMOS) mission[J].IEEE Transactions on Geoscience and Remote Sensing, 2001, 39(8):1729-1735. doi: 10.1109/36.942551 [3] ENTEKHABI D, NJOKU E G, O'NEILL P E, et al.The soil moisture active passive (SMAP) mission[J].Proceedings of the IEEE, 2010, 98(5):704-716. doi: 10.1109/JPROC.2010.2043918 [4] ZAVOROTNY V U, GLEASON S, CARDELLACH E, et al.Tutorial on remote sensing using GNSS bistatic radar of opportunity[J].IEEE Geoscience and Remote Sensing Magazine, 2014, 2(4):8-45. doi: 10.1109/MGRS.2014.2374220 [5] CARDELLACH E, FABRA F, NOGUES-CORREIG O, et al.GNSS-R ground-based and airborne campaigns for ocean, land, ice, and snow techniques:Application to the GOLD-RTR data sets[J].Radio Science, 2011, 46(6):1-16. doi: 10.1029/2011RS004683 [6] CHEW C, SHAH R, ZUFFADA C, et al.Demonstrating soil moisture remote sensing with observations from the UK TechDemoSat-1 satellite mission[J].Geophysical Research Letters, 2016, 43(7):3317-3324. doi: 10.1002/2016GL068189 [7] CHEW C C, SMALL E E.Soil moisture sensing using spaceborne GNSS reflections:Comparison of CYGNSS reflectivity to SMAP soil moisture[J].Geophysical Research Letters, 2018, 45(9):4049-4057. doi: 10.1029/2018GL077905 [8] 吴学睿, 李颖.GNSS-R陆面遥感中反射信号的极化特性研究[J].地球科学进展, 2012, 27(8):895-900. http://www.cnki.com.cn/Article/CJFDTotal-DXJZ201208008.htmWU X R, LI Y.GNSS-R land remote sensing about reflected signal's polarization characteristics[J].Advances in Earth Science, 2012, 27(8):895-900(in Chinese). http://www.cnki.com.cn/Article/CJFDTotal-DXJZ201208008.htm [9] WU X, JIN S.GNSS-Reflectometry:Forest canopies polarization scattering properties and modeling[J].Advances in Space Research, 2014, 54(5):863-870. doi: 10.1016/j.asr.2014.02.007 [10] MASTERS D, AXELRAD P, KATZBERG S.Initial results of land-reflected GPS bistatic radar measurements in SMEX02[J].Remote Sensing of Environment, 2004, 92(4):507-520. doi: 10.1016/j.rse.2004.05.016 [11] KATZBERG S J, TORRES O, GRANT M S, et al.Utilizing calibrated GPS reflected signals to estimate soil reflectivity and dielectric constant:Results from SMEX02[J].Remote Sensing of Environment, 2006, 100(1):17-28. doi: 10.1016/j.rse.2005.09.015 [12] ZAVOROTNY V, MASTERS D, GASIEWSKI A, et al.Seasonal polarimetric measurements of soil moisture using tower-based GPS bistatic radar[C]//IEEE International Geoscience & Remote Sensing Symposium.Piscataway: IEEE Press, 2003: 7962360. http://ieeexplore.ieee.org/xpls/icp.jsp?arnumber=1293916 [13] RODRIGUEZ-ALVAREZ N, BOSCH-LLUIS X, CAMPS A, et al.Soil moisture retrieval using GNSS-R techniques:Experimental results over a bare soil field[J].IEEE Transactions on Geoscience and Remote Sensing, 2009, 47(11):3616-3624. doi: 10.1109/TGRS.2009.2030672 [14] RODRIGUEZ-ALVAREZ N, CAMPS A, VALL-LLOSSERA M, et al.Land geophysical parameters retrieval using the interference pattern GNSS-R technique[J].IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(1):71-78. doi: 10.1109/TGRS.2010.2049023 [15] RODRIGUEZ-ALVAREZ N, MARCHAN-HERNANDEZ J F, CAMPS A, et al.Soil moisture retrieval using GNSS-R techniques: Measurement campaign in a wheat field[C]//IEEE International Geoscience and Remote Sensing Symposium.Piscataway: IEEE Press, 2009: 10445297. http://ieeexplore.ieee.org/document/4778973/ [16] ALONSO-ARROYO A, CAMPS A, AGUASCA A, et al.Improving the accuracy of soil moisture retrievals using the phase difference of the dual-polarization GNSS-R interference patterns[J].IEEE Geoscience and Remote Sensing Letters, 2014, 11(12):2090-2094. doi: 10.1109/LGRS.2014.2320052 [17] EGIDO A, PALOSCIA S, MOTTE E, et al.Airborne GNSS-R polarimetric measurements for soil moisture and above-ground biomass estimation[J].IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014, 7(5):1522-1532. doi: 10.1109/JSTARS.2014.2322854 [18] JIA Y, SAVI P.Sensing soil moisture and vegetation using GNSS-R polarimetric measurement[J].Advances in Space Research, 2017, 59(3):858-869. doi: 10.1016/j.asr.2016.11.028 [19] HSIEH C Y.Polarimetric bistatic scattering from random rough surfaces along azimuth angle[C]//International Conference on Microwave & Millimeter Wave Technology.Piscataway: IEEE Press, 1999: 591-594. doi: 10.1002/(SICI)1098-2760(20000520)25:4%3C271::AID-MOP14%3E3.0.CO;2-A/pdf [20] VORONOVICH A G, ZAVOROTNY V U.Full-polarization modeling of monostatic and bistatic radar scattering from a rough sea surface[J].IEEE Transactions on Antennas and Propagation, 2014, 62(3):1362-1371. doi: 10.1109/TAP.2013.2295235 [21] HALLIKAINEN M T.Microwave dielectric behavior of wet soil.Part I:Empirical models and experimental observations[J].IEEE Transactions on Geoscience and Remote Sensing, 1985, 23(1):25-34. doi: 10.1109/tgrs.1985.289497 [22] DOBSON M C.Microwave dielectric behavior of wet soil.Part Ⅱ:Dielectric-mixing models[J].IEEE Transactions on Geoscience and Remote Sensing, 1985, 23(1):35-46. http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4072240 [23] FUNG A K.Microwave scattering and emission models and their applications[M].Norwood:Artech House, 1994. [24] CHEN K, WU T, TSANG L.Emission of rough surfaces calculated by the integral equation method with comparison to three-dimensional moment method simulations[J].IEEE Transactions on Geoscience and Remote Sensing, 2003, 41(1):90-101. doi: 10.1109/TGRS.2002.807587 [25] ULABY F T, ELACHI C.Radar polarimetry for geoscience applications[M].Norwood:Artech House, 1990.