Received date: 2005-11-11
Revised date: 2006-04-18
Online published: 2006-07-15
]Soil moisture plays a significant role in the research of hydrology, climatology, and agriculture. As a new tool, this remote sensing method using reflected GPS signals has attracted much more attention. The GPS broadcasts a carrier signal at 1.57542GHz which is an optimal frequency for remote sensing soil moisture. The reflected GPS signal as a function of permittivity relates to the soil moisture. The experimental result proves that the reflected GPS signal is sensitive to the surface soil moisture characteristic. The reflectivity is corrected under the vegetation effects and comparison of the GPS and the other model is investigated. Developing the high gain antenna, correcting the effects of signal fluctuation and improving the method of remote sensing soil moisture are the main issues we should resolve in future work.
Key words： Soil moisture; Reflected GPS signal; GPS bistatic radar.
Guan Zhi, Zhao Kai, Song Dongsheng . Measuring Soil Moisture Using Reflected GPS Signals[J]. Advances in Earth Science, 2006 , 21(7) : 747 -750 . DOI: 10.11867/j.issn.1001-8166.2006.07.0747
[1] Jackson T, Schmugge J, Engman E. Remote sensing applications to hydrology: Soil moisture [J]. Hydrological Sciences, 1996, 41(4):517-530.
[2] Njoku E, O’Neill P. Multifrequency radiometer measurements of soil moisture [J]. IEEE Transactions on Geoscience and Remote Sensing,1982,20:468-475.
[3] Liu Zhiming, Zhang Bai, Yan Ming, et al. Some research advances and trends on soil moisture and drought monitoring by remote sensing [J]. Advances in Earth Science,2003,18(4):576-583.[刘志明, 张柏,晏明,等. 土壤水分与干旱遥感研究的进展与趋势[J]. 地球科学进展,2003,18(4):576-583.]
[4] Masters D, Katzberg S, Axelrad P. Airborne GPS bistatic radar soil moisture measurements during SMEX02[C]∥Proceeding of International IEEE Geoscience and Remote Sensing Symposium(IGARSS′03), Toulouse, France. 2003.
[5] Dallas Masters, Penina Axelrad, Stephen Katzberg. Initial results of land-reflected GPS bistatic radar measurements in SMEX02[J]. Remote Sensing of Environment, 2004, 92: 507-520.
[6] Masters D, Zavorotny V, Katzberg S. GPS signal scattering from land for moisture content determination[C]∥Proceeding of International IEEE Geoscience and Remote Sensing Symposium (IGARSS′00), Honolulu, HI.2000.
[7] De Roo R, Ulaby F. Bistatic specular scattering from rough dielectric surfaces[J]. IEEE Transactions on Antennas and Propagation, 1994, 42(2): 220-231.
[8] Beckmann P, Spizzichino A. The Scattering of Electromagnetic Waves from Rough Surfaces [M]. Norwood, MA: Artech House, 1987.
[9] Choudhury B, Schmugge T, Chang A, et al. Effect of surface roughness on the microwave emission from soils[J]. Journal of Geophysical Research,1979,84 (C9): 5 699-5 706.
[10] Zavorotny V, Voronovich A. Scattering of GPS signals from the ocean with wind remote sensing application [J]. IEEE Transactions on Geoscience and Remote Sensing, 2000, 38(2):951-964.
[11] Ulaby F T, Richard K M, Fung A K. Microwave Remote Sensing-Active and Passive, Vol. Ⅲ[C]. Michigan: Aztech Hous, 1986.
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