Precision estimation of local offsets between pairs of SAR SLCs and detected SAR images

Measurement of the offsets between SAR images is required for SAR applications including multitemporal studies, change detection, radargrammetry (stereo), interferometry, and surface deformation. Offsets between SAR images are measured in slant range and azimuth (alongtrack) directions. Applications requiring offset information can be classed into those that require only a global offset function and those, such as radar stereo and deformation mapping that require localized individual measurements. This paper describes our investigation to improve the accuracy of single measurements. The offset estimation algorithm is described. Over-sampling of the Single-Look Complex (SLC) data prior to estimating the offsets improves accuracy substantially. Estimates of the offset errors including offset dependent bias are evaluated using data from ERS.

[1]  P. Vachon,et al.  InSAR results from the RADARSAT Antarctic Mapping Mission data: estimation of glacier motion using a simple registration procedure , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).

[2]  R. Hanssen.  Radar Interferometry: Data Interpretation and Error Analysis , 2001 .

[3]  Thierry Toutin,et al.  State-of-the-art of elevation extraction from satellite SAR data , 2000 .

[4]  D. Agnew,et al.  The complete (3‐D) surface displacement field in the epicentral area of the 1999 MW7.1 Hector Mine Earthquake, California, from space geodetic observations , 2001 .

[5]  Margrit Gelautz,et al.  A COMPARATIVE STUDY OF RADAR STEREO AND INTERFEROMETRY FOR DEM GENERATION , 2004 .

[6]  GAMMA SAR AND INTERFEROMETRIC PROCESSING SOFTWARE , 2000 .

[7]  Søren Nørvang Madsen,et al.  Synthetic aperture radar interferometry-Invited paper , 2000 .

[8]  Ian Joughin,et al.  Ice-sheet velocity mapping: a combined interferometric and speckle-tracking approach , 2002, Annals of Glaciology.

[9]  C. K. Yuen,et al.  Theory and Application of Digital Signal Processing , 1978, IEEE Transactions on Systems, Man, and Cybernetics.

[10]  Jean Taboury,et al.  Measuring near field coseismic displacements from SAR images: Application to the Landers Earthquake , 1999 .

[11]  T. Strozzi,et al.  Radargrammetry and space triangulation for DEM generation and image ortho-rectification , 2003, IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477).

[12]  Urs Wegmüller,et al.  Flashing Fields! A Preliminary Investigation , 2005 .

[13]  U. Wegmuller,et al.  Automated terrain corrected SAR geocoding , 1999, IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293).

[14]  Urs Wegmüller,et al.  Glacier motion estimation using SAR offset-tracking procedures , 2002, IEEE Trans. Geosci. Remote. Sens..