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- W1963584062 abstract "ABSTRACT Borrowing from exploration seismology the basic common reflection point stacking process (CRP)1 and from remote sensing the analogous synthetic aperture method2 it should be possible to develop a far-seeing side scanning sonar system. A preliminary system of this nature, FARSSSS, is described in the following text. Although the entire analysis for the system is based on first order assumptions, it should be possible using FARSSSS to obtain sonic images of the sea bottom (and if desired - the upper subsea bottom) in nominal real time. For a survey vessel moving at 6 knots, the transverse scan extent should be about 5 mm on either side of the vessel with an effective resolution of about 75 ft. All components proposed for the system are standard items and the digital processing techniques are analogous to those used in exploration seismic data processing. In addition, the data acquired should contain information of importance to more sophisticated studies which attempt to determine the acoustic characteristics of the sea floor and upper strata of the subsea bottom. INTRODUCTION A vessel which travels at 6 knots is proposed as the vehicle for the digital FARSSSS survey. Figure 1 shows a diagram of the vessel along with its towed hydrophone streamer. A two-sided transducer array is shown attached to a fin below the vessel and later on some elementary theory relating to the array design will be presented. At 15 second intervals the source array is activated, alternately to the starboard and portsides of the vessel. Hence each side of the survey track is insonified at 15 second intervals corresponding to a distance along course of about 150 ft. Owing to the multiplicity and regularity of reception paths however, an effective resolution along course of about 75 ft. can be obtained after digital processing. The transducer array suggested operates at a central frequency of 200 Hz corresponding in good approximation to a 25 ft. wavelength in water. Since such frequencies propagate well in water, problems of sufficiency of energy (or equivalently considerations of range) become secondary matters. However, these frequencies propagate well also in the sea bottom and sub-bottom reflected energy will be returned along with the side-looking scans of the ocean floor. We shall distinguish between sea floor events and subsea reflections by their ‘move-out’ characteristics in appropriately gathered collections of reflection traces. By summing such traces along selected wavefronts, the sea floor events are enhanced at the expense of all other signals be they incoherent or coherent along other wavefronts. The essentials of this technique and its derivation from the common reflection point and synthetic aperture methods will be developed in the next section." @default.
- W1963584062 created "2016-06-24" @default.
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- W1963584062 date "1973-04-28" @default.
- W1963584062 modified "2023-09-25" @default.
- W1963584062 title "Elementary Theoretical Considerations for a Digital Far-Seeing Side Scanning Sonar System (FARSSSS)" @default.
- W1963584062 doi "https://doi.org/10.4043/1847-ms" @default.
- W1963584062 hasPublicationYear "1973" @default.
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