By Sergio Rui Silva
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Additional info for Advances in Sonar Technology (2009)
The shore base station accesses this data through a high-speed digital radiolink making available the surveyed data. 24 Advances in Sonar Technology Fig. 8. FGPA system detail. 5. Navigation system The accurate target area image formation process depends on the precise knowledge of the sensor position as it traverses the aperture. One of the major strengths of using a surface vessel is the use of satellite systems for navigation. Since the used wavelengths are in the order of centimetres, this is the level of relative accuracy that is required for the vessel along the length of the synthetic aperture.
15). g. fit for interferometric imagery). Motion compensation can be applied to the acquired data in two levels: compensation of the known trajectory deviations and fine corrections trough reflectivity displacement, auto-focus or phase-retrieval techniques. The deviations from a supposed linear path are compensated thorough phase and range shift corrections in the echo data. Velocity variations can be regarded as sampling errors in the along-track direction, and compensated through resampling of the original data ([Fornaro, G.
The time delay of each echo provides a measure of slant range, while the ping-to-ping motion of the projector gives the along-track image dimension. As the seafloor is imaged, the data are recorded and represented in the slant range plane. In Fig. 1. e. nadir). 1 Slant range processing for SLS and SAS In SAS, along track and across track processing are completely disentangled. For both SLS and SAS systems, the slant range processing is identical and often also called across track processing. This processing is performed to obtain range information from the seafloor.