By Sergio Rui Silva
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Extra resources for Advances in Sonar Technology (2009)
The near-edge elevation1 angle θe is the elevation angle at minimum range, the elevation beam width and the height of the sonar with respect to the seafloor determine the size of the ensonified swath width. As the platform moves, a projector transmits acoustic pulses and a hydrophone listens for the echoes. The time delay of each echo provides a measure of slant range, while the ping-to-ping motion of the projector gives the along-track image dimension. As the seafloor is imaged, the data are recorded and represented in the slant range plane.
18 2008. Tomiyasu, K. (1978). 5, pp. 563-583, May 1978. ; Chapman, S. ; Bugler, D. ; Hétet, A. (2001). "InSAS’00: interferometri SAS and INS aided SAS imaging", Proceeding of the IEEE Oceans 2001 Conference, volume 1, pp. 179-187, MTS/IEEE, 2001. ; Gumerov, N. ; Davis, L. (2003). “Improved Fast Gauss Transform and Efficient Kernel Density Estimation”, Proceedings of the Ninth IEEE International Conference on Computer Vision (ICCV’03), 2003, pp. 1. 3 Motion Compensation in High Resolution Synthetic Aperture Sonar (SAS) Images R.
Future work Synthetic aperture sonar imagery is a powerful technique for underwater imaging that is becoming widespread as the problems and difficulties inherent to it are solved. The use of multiple receiver systems will enable a higher area coverage ratio and ease navigation system precision requirements through the use of micronavigarion techniques. With the maturing of image formation algorithms, real-time image formation will further extend the application possibilities of synthetic aperture sonar systems.