Time filter

Source Type

Berlin, Germany

Cruz N.A.,INESC Porto | Ferreira B.M.,INESC Porto | Kebkal O.,Evologics Gmbh | Matos A.C.,INESC Porto | And 3 more authors.
Marine Technology Society Journal

In this paper, we investigate the creation of an underwater acoustic network to support marine operations based on static and mobile nodes. Each underwater device combines communication, networking, and sensing capabilities and cooperates with the other devices in coordinated missions. The proposed system is built upon the SUNSET framework, providing acoustic communications and networking capabilities to autonomous underwater vehicles, autonomous surface vessels, and moored systems, using underwater acoustic modems. Specific solutions have been developed and tested to control the underwater nodes acoustically and to instruct the vehicles on keeping a given formation using acoustic links. One of the novelties of our approach has been the development and utilization of a realistic simulation infrastructure to provide a very accurate representation of all the dynamic systems involved in the network, modeling the vehicle dynamics, the acoustic channel, and the communication messages. This infrastructure has been extensively used to investigate and validate the proposed solutions under different environmental conditions before the actual deployment of devices. Several experiments were then conducted in the laboratory and in the field. The experimental results have confirmed the effectiveness of the proposed solutions and the reliability of the proposed simulation framework in estimating system performance. Source

The market of unmanned surface vehicles (USVs) is expanding, with more and more remotely controlled and autonomous USVs becoming available as commercial products. While environmental monitoring and data collection remain the primary target for lightweight USVs, EvoLogics recently tried out a rather untypical, but very promising approach for using its Sonobot: the vehicle turned out to be well suited for calibration and testing of long-baseline (LBL) positioning systems, opening a wide range of new applications. Source

Evologics Gmbh | Date: 2011-03-03

The invention relates to a release apparatus for a load on a device, in particular on an underwater device, having a hook device, with which a hook is mounted on a hook-holding device such that it can rotate about a rotational axis and can be displaced between a closed and a released position by rotation about the rotational axis with the aid of a hook actuation mechanism, a load rest, which is formed on the hook and in which a holding element of the load rests when in the non-released state, and a restricted guidance device, which is configured to guide the load in an ejection direction when released, wherein, when the holding element of the load rests on the load rest, the hook in the closed position is torque-free with respect to a torque exerted by the load on the hook in relation to the rotation about the rotational axis. An underwater device having the release apparatus is also created.

Agency: Cordis | Branch: H2020 | Program: RIA | Phase: ICT-23-2014 | Award Amount: 3.97M | Year: 2015

The WiMUST (Widely scalable Mobile Underwater Sonar Technology) project aims at expanding and improving the functionalities of current cooperative marine robotic systems, effectively enabling distributed acoustic array technologies for geophysical surveying with a view to exploration and geotechnical applications. Recent developments have shown that there is vast potential for groups of marine robots acting in cooperation to drastically improve the methods available for ocean exploration and exploitation. Traditionally, seismic reflection surveying is performed by vessel towed streamers of hydrophones acquiring reflected acoustic signals generated by acoustic sources (either towed or onboard a vessel). In this context, geotechnical surveying for civil and commercial applications (e.g., underwater construction, infrastructure monitoring, mapping for natural hazard assessment, environmental mapping, etc.) aims at seafloor and sub-bottom characterization using towed streamers of fixed length that are extremely cumbersome to operate. The vision underlying the WiMUST proposal is that of developing advanced cooperative and networked control / navigation systems to enable a large number (tens) of marine robots (both on the surface and submerged) to interact by sharing information as a coordinated team (not only in pairs). The WiMUST system may be envisioned as an adaptive variable geometry acoustic array. By allowing the group of surface and submerged vehicles to change their geometrical configuration, an end-user can seamlessly change the geometry of the virtual streamer trailing the emitter, something that has not been achieved in practice and holds potential to drastically improve ocean surveying. The project brings together a group of research institutions, geophysical surveying companies and SMEs with a proven track record in autonomous adaptive and robust systems, communications, networked cooperative control and navigation, and marine robot design and fabrication.

Agency: Cordis | Branch: FP7 | Program: CP | Phase: ICT-2013.1.7 | Award Amount: 6.49M | Year: 2013

We must learn to both sustainably exploit & protect our vast oceans, provider of oxygen, food, hydrocarbons & other resources. A solution lies in sensing & interacting through an Internet of Things, with distributed networks of intelligent sensors & actuators. Unfortunately, we currently lack a marine Internet, crucial to achieve distributed, coordinated & adaptive control, due to the rapid absorption of light & radio waves in seawater.\n\nThe SUNRISE objectives are to develop:\n5 federated underwater (UW) communication networks (CommsNet), based on pilot infrastructure already designed, built & deployed by consortium partners, in diverse environments, web-accessible & interfaced with existing FIRE facilities to experiment with Future Internet technologies.\nA software-defined open-architecture modem & protocol stack that will empower open collaborative developments.\nStandard platforms for simulation, emulation & replay testing to estimate CommsNet performance at a fraction of current at-sea experiments, validated by tests conducted on the SUNRISE networks over a variety of applications & environments.\nA user-friendly interface for diverse users to interact with SUNRISE systems to conduct trials & benefit from databases of CommsNet performance data gathered over long periods from the SUNRISE infrastructure.\n\nSUNRISE directly addresses FIRE objectives by combining technology with novel paradigms in new, open experimental facilities, integrating physical systems with software development in a new physical domain. SUNRISE will provide a way to select UW CommsNet standards based on objective measures of performance, strengthening as more sites are added in the future. The SUNRISE network will remain key for UW Internet development long after the project ends, with broad involvement of researchers, manufacturers & users ensuring that appropriate technologies are developed, selected & implemented in products that support sustainable maritime exploitation and management.

Discover hidden collaborations