Acoustic Communications News

Image Courtesy: Sonardyne

MTR100: Sonardyne International Ltd.

Chelsea Technologies, and Danish maritime survey software and construction firm EIVA. Both organizations are to remain independently run and with their own brands.Sonardyne’s recent focus includes collaborations with manufacturers of marine autonomous systems (MAS). This spring, its acoustic communications technology has been used onboard an unmanned surface vessel (USV) operating in the North Sea to harvest data from seabed sensor nodes in what is believed to be the first over-the-horizon operation by a UK-based oil major.  Around the same time, the company’s BlueComm optical modems

(Photo: Proserv)

Imenco Buys Proserv's Nautronix Unit

Controls technology company Proserv said it has sold its through-water digital acoustic communications and positioning systems business, Nautronix, to Imenco, a Norwegian supplier of subsea electronic and mechanical products.The divested unit will become a division within Imenco, which will continue to be known as Imenco UK Ltd. The exact terms of the deal were not disclosed.“Nautronix has enjoyed almost four years within the Proserv portfolio but this opportunity to link up with Imenco is an exciting one and we look forward to developing our business within Geir’s wider team,” said

Thyssenkrupp’s MUM concept. Image from Thyssenkrupp.

Robotics: The Next Gen in Subsea Vehicles

the moment, as the fuel cell system has its strengths for enduring underwater tasks.For long range communication, on long missions, Thyssenkrupp MS is looking to use self-propelled modems, or autonomous communication nodes, with bi-directional data transmission capability, to create long-range acoustic communications through a chain of these nodes, as well as local navigation or 3D positioning via USBL modems. These are being developed under a sub-project called NaviMUM by EvoLogics and would be deployed from a revolver magazine on the MUM.EvoLogics calls the concept a self-organising mobile underwater

Figure 6: A DOLPHIN Sonar trial result, SAS at three times Nyquist speed. Image: QinetiQ North America

DOLPHIN: Enabling Technology for Acoustic Systems

- a patented method using analog cancellation that eliminates receiver saturation and enables simultaneous transmit and receive.  Figure 1 describes this concept.Figure 1: The basic concept of DOLPHIN. Image: QinetiQ North AmericaApplication to Underwater TelemetrySince the beginning of acoustic communications, the state of the art technology has been limited to half-duplex signals: transmit with the receiver off and then turn the transmitter off and receiver on and wait to receive, because the direct transmission at the source saturates the receiver electronics if they are enabled simultaneously

Broadcasting from the deep on the Nekton First Descent mission using a BlueComm UV. (Photo: Sonardyne)

World First: Video Broadcast Live from Underwater

which means overcoming the challenges of signal interference.“Without BlueComm, this could not be done,” said Darryl Newborough, Sonarydne’s Technical Director. “The submersibles have no cable connection to the vessel, so they cannot send their video feed through a cable. Acoustic communications technologies work well, and over long distances, but their bandwidth is not wide enough to support live video streaming. BlueComm is the only option.”In fact, BlueComm is the only commercially available technology that enables wireless transmission of high bandwidth data, including

Mike Read (Photo: Teledyne Marine)

5 Minutes with Mike Read, President, Teledyne Marine

Bowtech’s LED-K-Series lamp now includes four lumen outputs; 2,100, 3,200, 4,200 or 5,000 lumens.Teledyne Marine InstrumentsThe Teledyne Marine Instruments provides subsea and surface sensors that span a range of technologies, including: navigation; ocean currents/waves measurements; CTDs; acoustic communications, positioning and releases; pipe and cable tracking; corrosion monitoring, and more. Instruments brands include: Benthos, Cormon, Oceanscience, RD Instruments, and TSS, and new tech in 2018 includes:Teledyne TSS reports high demand for its compact new 660 Pipe Tracker, enabling smaller electrical

(Photo: ASV Global)

Symbiotic Autonomy for Deep Water Survey

and control, with high-speed through-water data transfer also lays the ground work for long-range, over-the-horizon autonomous underwater vehicle survey operations,” he added.Matthew Kingsland Senior Robotics Systems Engineer, NOC, said, “We are now able to send down new missions via acoustic communications to avoid the ALR having to surface from 6 kilometers deep. We are not only tracking, we are getting quality data back from the system via acoustics, so we can make informed decisions.”“Under this project, we have demonstrated a novel autonomous behavior running under the Neptune

ATM-900 Series Modem (Image: Teledyne Benthos)

Teledyne Benthos Acoustic Modems Meet NATO’s New JANUS Interoperability Standard

between equipment from the various ACOMMS manufacturers.To address this need, over the past 10 years the Centre for Maritime Research and Experimentation has been leading the efforts to develop a digital underwater coding standard aimed at providing a baseline common denominator for underwater acoustic communications. This new standard is called JANUS, named after the Greek God in control of beginnings and transitions. As of March 2017, JANUS is now recognized as a NATO standard referred to as STANAG, a Standardization Agreement by all the NATO Nations.According to a recent CMRE press release, once adopted

WiSub CEO Mark Bokenfohr (Photo: WiSub)

WiSub’s Universal AUV Connector

waves. Microwaves are defined to operate in the 300MHz to 300GHz frequency range; the other technologies applied in the field of underwater communication typically operate at far lower frequencies, and correspondingly lower data rates. Data speeds of kbps (kilobits per second) are possible with acoustic communications. Radio-frequency communication links (within the 3 KHz to 300 GHz range) are able to achieve similar data speeds over some meters. Inductive links used for power transfer are often also used for data transfer, with small separation between frequencies, which presents some risk of interference

Image: NATO

JANUS: First Digital Underwater Communication Standard

of new game-changing robotic technologies. That is why the NATO STO Centre for Maritime Research and Experimentation (CMRE), based in La Spezia (Italy), has started about 10 years ago to develop a digital underwater coding standard aimed at providing a baseline common denominator for underwater acoustic communications. It is called JANUS and it has been now recognized as a NATO standard, called a STANAG for Standardization Agreement, by all the NATO Nations. This marks the first time ever for a digital underwater communication protocol to be acknowledged at international level, and it opens the way for

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