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The EdgeTech 4125 Series Dual-frequency Side Scan Sonar System is a frequency-modulated (FM), dual-
frequency, side scan sonar that uses EdgeTech’s proprietary Full Spectrum “chirp” technology to generate
high-resolution, side scan imagery at longer ranges than conventional continuous-wave (CW) systems.
The system is designed primarily for search and recovery operations, along with surveys in shallow water.
The 4125 Series is available in two, dual simultaneous frequency configurations depending on the
application: 400/900 kHz and 600/1600 kHz. For shallow water survey applications, the 400/900-kHz
frequency set is the best choice, as it provides an ideal combination of range and resolution. For ultra-
high resolution imagery at shorter ranges, the 600/1600 kHz set is the recommended choice.
In both configurations, the frequencies are transmitted as linearly-swept, wide-band, high energy acoustic
pulses, and the received echoes are processed into high signal-to-noise (SNR) images that can be directly
displayed as shades of gray or color on a computer monitor. The SNR images can also be printed on a
continuous feed thermal printer, or stored in real time onto a large capacity hard drive and archived onto
a DVD.
Applications for the 4125 Series Dual-frequency Side Scan Sonar System are many, including:
x Hydrographic surveys
x Geological surveys
x Search and recovery
x Channel conditioning/clearance surveys
x Bridge, pier, and harbor wall inspections
x Hull inspections
x Port security
x Archaeological surveys
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