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SECTION 1: Overview
The 3200-XS Sub-Bottom Profiling System is a high resolution wideband frequency
modulated (FM) sub-bottom profiler that uses EdgeTech’s proprietary Full Spectrum chirp
technology to generate cross sectional images of the seabed and collect digital normal
incidence reflection data over many frequency ranges. The 3200-XS transmits an FM pulse
(also called a "chirp pulse") that is linearly swept over a full spectrum frequency range. The
reflections measured by the system are displayed as shades of gray or color on a
computer monitor and may be printed on a continuous feed thermal printer. Data are stored
in real time onto a large capacity hard drive and can be archived to a DVD.
1.1 Company Background
EdgeTech (formerly EG&G Marine Instruments) traces its history in underwater data
acquisition and processing back to 1966. EdgeTech has designed, developed and
manufactured products, instruments and systems for the acquisition of underwater data,
including marine, estuarine and coastal applications for over 35 years. It has responded to
the needs of the scientific, Naval and offshore communities by providing equipment, such
as sub-bottom profilers, side scan sonar, acoustic releases, current meters, and positioning
systems that have become standards in the industry. Equally as significant is the
company's ability to anticipate and respond to future needs through an active research and
development program. Current efforts are focused on the application of cutting edge chirp,
DSP and acoustic technology.
1.2 Advantages of Full Spectrum Chirp Technology
EdgeTech's Full Spectrum chirp technology has several distinct advantages over
conventional sub-bottom profiling systems. These benefits include use of separate
acoustic projectors and receivers to enable simultaneous transmission and reception of
acoustic signals, high repeatability of the transmitted signals to enable sediment
classification, high signal-to-noise ratio (SNR) for improved acoustic imagery, high
resolution for measurement of fine sediment layering, additional processing gain for energy
efficiency, Gaussian shaped amplitude spectrum of the outgoing pulse to preserve
resolution with sediment penetration, and reduction of side lobes for minimal destructive
signal scattering caused by the sediment when profiling near the bottom.
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