An analysis of the effect of motion and phase errors on the implementation of interferometric processing by synthetic aperture sonar

An end-to-end simulated processing chain related to an existing synthetic aperture sonar (SAS) system is developed and described, to include motion compensation, efficient image formation, and autofocus procedures. The processing is extended to include interferometric height estimation steps. The system is analyzed in a novel way with respect to motion errors and the subsequent damaging effects to both imaging and height estimation. Both real and simulated results are presented. High resolution SAS imaging coupled with interferometric height estimation for seafloor imaging has military applicability in mine detection or classification and in topographic mapping in preparation for an amphibious assault. Civilian uses would include surveying and seabed mapping.

[1]  C.F.N. Cowan,et al.  Interferometric synthetic aperture sonar for high resolution 3-D mapping of the seabed , 1997 .

[2]  L. C. Graham,et al.  Synthetic interferometer radar for topographic mapping , 1974 .

[3]  C. D. Loggins,et al.  Measurement of the temporal phase stability of the medium , 1982 .

[4]  D. W. Stowe,et al.  Stability of the Acoustic Pathlength of the Ocean Deduced from the Medium Stability Experiment. , 1974 .

[5]  Matthew A. Nelson.  Recent results from the DARPA synthetic aperture sonar , 1997 .

[6]  M. P. Bruce,et al.  A processing requirement and resolution capability comparison of side-scan and synthetic-aperture sonars , 1992 .

[7]  P. T. Gough,et al.  A short history of synthetic aperture sonar , 1998, IGARSS '98. Sensing and Managing the Environment. 1998 IEEE International Geoscience and Remote Sensing. Symposium Proceedings. (Cat. No.98CH36174).

[8]  Louis J. Cutrona,et al.  Comparison of sonar system performance achievable using synthetic‐aperture techniques with the performance achievable by more conventional means , 1975 .

[9]  Richard M. Goldstein,et al.  Studies of multibaseline spaceborne interferometric synthetic aperture radars , 1990 .

[10]  P. de Heering.  Alternate schemes in synthetic aperture sonar processing , 1984 .

[11]  Charles V. Jakowatz,et al.  Phase gradient autofocus-a robust tool for high resolution SAR phase correction , 1994 .

[12]  M. Brussieux,et al.  Towards development of autofocusing schemes for phase compensation of synthetic aperture sonars , 1997, Oceans '97. MTS/IEEE Conference Proceedings.

[13]  F. Rocca,et al.  SAR data focusing using seismic migration techniques , 1991 .