Advances in Earth Science ›› 2012, Vol. 27 ›› Issue (8): 895-900. doi: 10.11867/j.issn.1001-8166.2012.08.0895

• Articles • Previous Articles     Next Articles

GNSS-R Land Remote Sensing about Reflected Signal’s Polarization Characteristics

Wu Xuerui 1,2,3, Li Ying 1   

  1. 1.College of Environment Information, Dalian Maritime Universtiy,Dalian〓116026,China;
    2.Department of Environment Resources and Management,Chifeng College,Chifeng〓024400,China;
    3.State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing〓100875, China
  • Received:2012-03-07 Revised:2012-05-22 Online:2012-08-10 Published:2012-08-10

Wu Xuerui, Li Ying. GNSS-R Land Remote Sensing about Reflected Signal’s Polarization Characteristics[J]. Advances in Earth Science, 2012, 27(8): 895-900.

GNSS-R is a new promising remote sensing technique due to the advantages of low cost, small power and high spatial and time resolutions. GNSS constellation transmits the Right Hand Circular Polarization (RHCP) signals, which bring some useful information of the earth surface properties and reflect from it. They are received by the special designed GNSS-R receiver. Compared with the direct signals, the reflected ones are weaker and their polarizations have been changed, so a suitable receiver should be designed using the corresponding polarizations antenna to reduce polarized loss and increase the strength of received reflected signals. In principal, GNSS-R is a kind of bistatic radar. This paper provides some research based on the microwave scattering model. Bare surface and vegetation theoretical simulations were taken as the transmitted signals is RHCP and the received ones are RHCP, LHCP, H and V polarizations. As for bare surface, specular reflectivity model and PO model are used, the Bistatic mimics (Bimimics) is developed based  on the backscattering model Mimics (Michigan Microwave Canopy Scattering Model) by adding the azimuth and zenith scattering angles. The simulations indicate that there is scattering values only at large incident angles (small elevation angles) as for the received polarization is LHCP. But linear polarizations exist for all the scattering angles(10°~70°). Scattering response of V polarization is the largest one.Therefore, it is good for surface characteristics research. In theory, our theoretical simulations provide some useful information for receiver’s polarization design.

No related articles found!
Full text