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Side Scan Sonar - Dual frequency

Dual Frequency Side Scan Sonar
Dual Frequency Side Scan Sonar towfish and tranceiver for seabed feature mapping offering flexibility and high quality results.

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A reliable sonar for general purpose surveys

Dual Frequency Side Scan Sonar system is the ideal tool for seabed feature mapping, offering high quality results in a simple and reliable package.

It offers switch selectable dual frequency operation (114 / 410 kHz), which when combined with multiplexed data transmission enables a low-drag coaxial cable to be used. The versatility, ease of operation and reliability have made it a popular choice for navies and commercial survey companies alike.

Key features

  • 1000 m depth rating
  • Switch selectable dual frequency (114 / 410 kHz)
  • High bandwidth and resolution
  • Multiplexed data transmission over long cables
  • Easy to operate
  • High reliability (MBTF > 10,000 hours)
  • High efficiency / low power
  • Simple maintenance

System components

The standard system employs a lightweight towfish (Model 159D), which is easily deployed by one person. The towfish houses a multiplexer (Model SS982), allowing data transmission over long cables, as well as the two dual frequency transducers (model 196D port and starboard). The transceiver unit (model SS981) outputs a signal compatible with all major acquisition systems.


The sonars deck unit allows the operator a simple means to select operation parameters such as operating frequency, Gain, Time Varying Gain (TVG) and Automatic Gain Control (AGC), with duplicated controls for the port and starboard channel.


The sonar towfish was designed as an easily deployable stable platform for versatile operations.


The Multiplexer is the sub-sea processing unit. It holds all transmit, receive and multiplexing electronics and uses standard sub-sea connectors to the transducers and tow cable, thereby ensuring that transmission power is not lost over the tow-cable and reducing the risks of high voltage defects.


  • 2000 m rated towfish
  • Stainless steel towfish
  • Range of winches and tow cables
  • Heading, pitch and roll sensor
  • Responder for acoustics tracking
  • Height of bottom measurement
  • Depth sensor
  • Magnetometer interface

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