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ACKNOWLEDGEMENTS 
This work was supported by funds from CAS and NSFC under 
grants kzcx2-yw-301 and 40671140. The EnviSat ASAR data 
were provided by ESA through the Category-1 ID:1406.The 
authors would like to thank ESA supplying the ERS-1/2 data 
and the Delft Institute of Earth Oriented Space Research 
supplying the satellite precise orbit data and the fortran program 
getorb for our studies.