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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1, Number 3, May 2009

Issue on Electrical & Electronics

Page(s): 324-327

Seafloor Imaging via Synthetic Aperture Technology

R.Sathishkumar, A.Vimalajuliet and Dhilsha Rajapan

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Abstract

Synthetic Aperture imaging techniques have been applied to Radar for several decades. The development of Synthetic Aperture Sonar (SAS) has been slow compared to the equivalent radar (SAR) systems. The large computation time needed for exact time domain inversion can be avoided by using one of a number of frequency domain techniques such as the Chirp Scaling or Range Doppler algorithms. Frequency domain techniques generally work well if the synthetic aperture is evenly sampled and linear. Deviations occur in sonar data can be shown to seriously degrade the image produced. The frequency domain technique offers flexibility in terms of choosing the area and resolution of the scene to be imaged. The Fast Factorized Back Projection (FFBP) technique is a fast time domain technique can be varied allowing image quality to be traded with computation time. We look at the problem of SAS from the point of view of applying radar techniques to sonar. This paper converse the application of FFBP to SAS and present a method to apply for real experimental data.

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