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By Edited by: Sergio Rui Silva

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In practical terms is not always possible to use high pulse repetition frequencies due to range ambiguity. With several receiver transducers the PRF can be lower, but the system cost is considerably higher not only due to the transducer array itself but also because of the data acquisition and signal processing system increased complexity. 4. System description The complete system setup ([Silva, S. (2007a)]) is constituted by a control base station, a surface craft and the sonar itself (Fig. 1).

5. Motion compensation is the main key to obtain high-resolution SAS images, which are in turn indispensable to be able to perform not only reliable small target detection but also classification and identification. The prime concept solving the micronavigation issue is called Displaced Phase Centre Array (DPCA) that exploits in a unique way the spatial and temporal 48 Advances in Sonar Technology coherence properties of the seafloor backscatter in a multiple receiver array configuration. The DPCA concept will be explained and illustrated on simulated data in section 5.

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. 336-348. Douglas, B. ; Lee, H. (1993) “Synthetic-aperture Sonar Imaging with Multiple-element Receiver Array”, IEEE International Conference on Acoustics, Speech, and Signal Processing, vol.

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