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1.0 OVERVIEW
The next-generation 4205 is a versatile side scan sonar system that can be configured for almost any
survey application from shallow to deepwater operations. The 4205 utilizes EdgeTech’s Full Spectrum®
CHIRP technology to provide crisp, high-resolution imagery at ranges up to 50% greater than non-CHIRP
systems, thus allowing customers to cover larger areas and save money spent on costly surveys.
In addition to the high-resolution imagery that EdgeTech is known for, the 4205 comes with several new
features that make the system even more flexible and powerful in offshore operations. The 4205 is
available in either a tri-frequency side-scan sonar configuration or motion tolerant and multi-pulse
configuration. The tri-frequency version allows surveyors the option to operate any two frequencies
simultaneously from the tri-frequency system. Long-range operations, for example, can be achieved with
a selection of 230/540kHz combination. Then, on-demand the system can be changed to a 540/850kHz
system for an even higher resolution survey.
The 4205 Motion Tolerant Configuration with Multi-Pulse (MPMT) provides surveyors the ability to
operate either at faster survey speeds or in more adverse weather conditions while still obtaining high-
quality underwater imagery. This configuration can also be operated in a single pulse high-resolution
mode for those operations that require a highly detailed view of the seafloor. In both the SP and MP
configurations, the two frequencies are transmitted simultaneously. In the MP configuration, multi-pulse
operation doubles the repetition rate. This allows for increased tow speeds of up to 9.6 knots, while still
meeting the NOAA and IHO-44S Shallow Water Survey Specification of three pings on a 1-meter cubed
target at 100 meters.
In both the Tri-Frequency and Motion Tolerant/Multi-Pulse configurations, towfish and target positioning
have been improved with the integration of a more accurate heading sensor that can be coupled with an
optional USBL beacon. Additionally, all systems now come with Increased Towfish power to support a
wider range of additional third-party sensors. All EdgeTech 4205 systems are comprised of a topside
system and a reliable stainless-steel towfish. Topside processors come in a choice of configurations from
Portable to Rack Mounted units. The easy-to-use Discover software is supplied with every unit.
Dual-Frequency Sonar Options include 120/410 kHz, 230/540 kHz, and 230/850 kHz, while Tri-Frequency
Sonar Options include 120/410/850 kHz and 230/540/850 kHz. In all configurations, the frequencies are
transmitted as linearly-swept, wide-band, high energy acoustic pulses. The received echoes are processed
into high Signal-to-Noise Ratio (SNR) images that can be directly displayed as shades of gray or one of
many varying color palettes on a computer monitor.
The 4205 has a variety of features, including:
• Tri-Frequency Side Scan Sonar
• Motion Tolerant Mode
• Improved Target Positioning
• Crisp, High-Resolution CHIRP images
• Increased Towfish power to support a wider range of additional Third-Party Sensors
• Single-pulse high-resolution mode
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