Details of Grant 

EPSRC Reference:	GR/J81082/01
Title:	SYNTHETIC APERTURE SONAR: INTERFEROMETRY AND MOTION COMPENSATION
Principal Investigator:	Griffiths, Professor H
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Department:	Electronic and Electrical Engineering
Organisation:	UCL
Scheme:	Standard Research (Pre-FEC)
Starts:	01 March 1994	Ends:	28 February 1997	Value (£):	117,369
EPSRC Research Topic Classifications:	RF & Microwave Technology
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Summary on Grant Application Form
1. To develop algorithms for compensation errors in synthetic aperture sonar (SAS);2. To develop algorithms for 3D imaging of sea bed features using SAS interferometry;3. To develop algorithms for imaging of moving targets using SAS;4. To test algorithms in real time in a sonar test tank.Progress:This work is being carried out in collaboration with the Department of Electronic and Electrical Engineering at Loughborough University of Technology (GR/J71106).In the first year a simulation program has been written to show the distortion in images of point tartets caused by various types of platform motion error, and the consequent errors in 3-dimensional reconstruction of the target. This is now being further developed to determine how the motion errors can be estimated, and hence corrected, from the distortions. A theory of interferometric SAS imaging has been established, showing how the ambiguities associated with reconstruction of the 3-D image may be resolved. An experimental interferometric synthetic aperature sonar system has been built and tested in the tank at Loughborough. 3-D images of various types of target have been obtained, and these agree well with the expected target shapes, demonstrating the validity of the technique. So far this system does not include any platform motion errors, but now it can be developed to deliberately include such errors to demonstrate how they can be estimated and corrected. Some initial progress has been made on the theory of SAS imaging of moving targets, showing that because of the lower propagation velocity this is significantly more difficult than the equivalent problem in synthetic aperture radar.
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