By Sergio Rui Silva
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Additional resources for Advances in Sonar Technology (2009)
1999). “SAMI: A Low-Frequency Prototype for Mapping and Imaging of the Seabed by Means of Synthetic Aperture”, IEEE Journal of Oceanic Engineering, vol. 24, no. 1, pp. 4-15, January 1999. ; Silva, S. (2007). "ZARCO - An Autonomous Craft for Underwater Surveys", Proceedings of the 7th Geomatic Week, Barcelona, Spain, Feb 2007. Cutrona, L. J. (1975), “Comparison of sonar system performance achievable using syntheticaperture techniques with the performance achievable by more conventional means”, The Journal of the Acoustical Society of America, Volume 58, Issue 2, August 1975, pp.
The analytic representation of the function still contains a carrier term exp(iω0t), where ω0 represents the carrier radian frequency. Demodulated functions are subscripted with a b to indicate a base band function. The processing of base banded data is the most efficient method, as it represents the smallest data set for both the FFT (Fast Fourier Transform) and any interpolators. Many synthetic aperture systems perform pulse compression of the received reflections in the receiver before storage.
Auto-focus Since the available navigation data sources, be it DGPS or INS systems, cannot provide enough precision to enable synthetic aperture processing of high resolution (high frequency) 34 Advances in Sonar Technology sonar data [Bellettini et al (2002); Wang et al (2001)], the phase errors caused by the unknown motion components and medium turbulence must be estimated to prevent image blurring. Auto-focus algorithms exploit redundancy and or statistical properties in the echo data to estimate certain image parameters that lead to a better quality image.
Advances in Sonar Technology (2009) by Sergio Rui Silva