by Enson Chang
Dynamics Technology Inc.
3-4pm
Friday, January 9th, 2004
Refreshments served at 2:45pm
Munk Conference Room
Cecil and Ida M. Green Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
University of California, San Diego
http://mahi.ucsd.edu/seminar/
Abstract:
Synthetic aperture sonar (SAS) is the underwater acoustic analog of SAR. Under ideal conditions it is also capable of producing range and wavelength-independent azimuthal resolution. However, the underwater environment is more complicated (compared to free space for radar) with significant sound speed fluctuations. The longer integration time and slower platform speed also imply greater motion-induced phase errors. High-frequency SAS in the 10's of kHz to 100's of kHz regime have been demonstrated convincingly in the recent years due to the use of data-driven motion compensation and autofocus algorithms. SAS in the several hundred to several kHz regime using flexible towed array receivers, however, is still under development. We will review some of the theoretical arguments of why SAS should work in spite of strong medium fluctuations in this regime. We will also present some of the recent experimental results.