TY - GEN
T1 - Research on method of flat earth effect removal based on refined local fringe frequency
AU - Lin, Chun Yan
AU - Chen, Liang
AU - Ge, Shi Qi
PY - 2013
Y1 - 2013
N2 - As is well known, interferometric synthetic aperture radar (InSAR) has been widely used in remote sensing field, which can reflect actual topographic trend or surface deformation. The precision of interferometric phase is crucial to the final measurement. Due to the orbit attitude influence, the flatearth phase usually causes the interferogram dense and difficult to be used in further procedures. So before phase unwrapping, interferogram must be flattened accurately. Nevertheless, some flat-earth phase is still left in the flattened interferogram with the traditional methods. In this paper, two refined algorithms of flat earth effect removal are proposed which are based on precise local fringe frequency. They are respectively the algorithm of Fast Fourier Transform (FFT) and cubic spline interpolation as well as that of FFT and Chirp-Z transform (CZT). Finally, both simulated and actual data are presented to validate the feasibility and practicality of the refined flattening algorithms proposed in this paper.
AB - As is well known, interferometric synthetic aperture radar (InSAR) has been widely used in remote sensing field, which can reflect actual topographic trend or surface deformation. The precision of interferometric phase is crucial to the final measurement. Due to the orbit attitude influence, the flatearth phase usually causes the interferogram dense and difficult to be used in further procedures. So before phase unwrapping, interferogram must be flattened accurately. Nevertheless, some flat-earth phase is still left in the flattened interferogram with the traditional methods. In this paper, two refined algorithms of flat earth effect removal are proposed which are based on precise local fringe frequency. They are respectively the algorithm of Fast Fourier Transform (FFT) and cubic spline interpolation as well as that of FFT and Chirp-Z transform (CZT). Finally, both simulated and actual data are presented to validate the feasibility and practicality of the refined flattening algorithms proposed in this paper.
KW - Chirp-Z transform
KW - Cubic spline interpolation
KW - Flat earth effect
KW - InSAR
KW - Local fringe frequency
UR - http://www.scopus.com/inward/record.url?scp=84894534092&partnerID=8YFLogxK
U2 - 10.1049/cp.2013.0178
DO - 10.1049/cp.2013.0178
M3 - Conference contribution
AN - SCOPUS:84894534092
SN - 9781849196031
T3 - IET Conference Publications
BT - IET International Radar Conference 2013
T2 - IET International Radar Conference 2013
Y2 - 14 April 2013 through 16 April 2013
ER -