SeaModem: A low-cost underwater acoustic modem for shallow water communication

Cario, Gianni; Casavola, Alessandro; Lupia, Marco; Rosace, Claudio

doi:10.1109/oceans-genova.2015.7271721

Cited by 37 publications

(15 citation statements)

References 4 publications

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“…All aforementioned manufacturers that produce LF devices also develop MF acoustic modems. In addition to them, other companies also supply commercial off-the-shelf products in this range, such as the Popoto Modem [36], the Applicon Seamodem [37], Sonardyne 6G [38], DSPComm Aquacomm Gen2 [39], SubNero [40], and the Blueprint Subsea [41] acoustic modem. In low-noise scenarios, a vertical communication link with an MF modem can reach a bit rate up to tens of kbps [42], depending on the modem manufacturer, while in horizontal communications in very shallow water, they can provide a communication link with a bit rate spanning from 500 bps up to few kbps.…”

Section: Underwater Acoustic Communicationsmentioning

confidence: 99%

Wireless Remote Control for Underwater Vehicles

Campagnaro

Signori

Zorzi

2020

JMSE

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Nowadays, the increasing availability of commercial off-the-shelf underwater acoustic and non-acoustic (e.g., optical and electromagnetic) modems that can be employed for both short-range broadband and long-range low-rate communication, the increasing level of autonomy of underwater vehicles, and the refinement of their underwater navigation systems pave the way for several new applications, such as data muling from underwater sensor networks and the transmission of real-time video streams underwater. In addition, these new developments inspired many companies to start designing hybrid wireless-driven underwater vehicles specifically tailored for off-shore operations and that are able to behave either as remotely operated vehicles (ROVs) or as autonomous underwater vehicles (AUVs), depending on both the type of mission they are required to perform and the limitations imposed by underwater communication channels. In this paper, we evaluate the actual quality of service (QoS) achievable with an underwater wireless-piloted vehicle, addressing the realistic aspects found in the underwater domain, first reviewing the current state-of-the-art of communication technologies and then proposing the list of application streams needed for control of the underwater vehicle, grouping them in different working modes according to the level of autonomy required by the off-shore mission. The proposed system is finally evaluated by employing the DESERT Underwater simulation framework by specifically analyzing the QoS that can be provided to each application stream when using a multimodal underwater communication system specifically designed to support different traffic-based QoSs. Both the analysis and the results show that changes in the underwater environment have a strong impact on the range and on the stability of the communication link.

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Section: Underwater Acoustic Communicationsmentioning

confidence: 99%

Wireless Remote Control for Underwater Vehicles

Campagnaro

Signori

Zorzi

2020

JMSE

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“…There is an acknowledgement‐based link layer with IPv4 and IPv6 support at the network layer. As alternatives to the SDR approach, Cario et al have implemented their modem on a DSP board, whereas Benson et al did it on field‐programmable gate array. More recent results on underwater modem design include the work of Goncalves et al on OFDM and Demirors et al on high‐speed communications.…”

Section: Related Workmentioning

confidence: 99%

Tuning the demodulation frequency based on a normalized trajectory model for mobile underwater acoustic communications

Ahmad

Barbeau

García-Alfaro

et al. 2019

Trans Emerging Tel Tech

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We have developed a demodulator for low data rate, asynchronous frame, and narrow bandwidth underwater acoustic communication. We aim at operation under harsh conditions, ie, low signal-to-noise ratio, and across long distances.In this paper, we pay a special attention to the efficiency of mobility support.Mobility results into the Doppler effect, which, for a demodulator, makes the carrier frequency drift arbitrarily during attempts to decode frames. The chances of success are better when the demodulator can tune into the drifted carrier frequency. This can be achieved by trying a range of possible drifted carriers. We introduce the novel idea of normalized trajectory. Each normalized trajectory produces a unique Doppler shift pattern that can be applied to tune into a drifted carrier. We demonstrate that this improvement is theoretically sound. From a practical point of view, the search space is potentially reduced. The actual gain in performance is application-specific and depends on the actual sets of trajectory parameters that are considered. We introduce the concept of normalized trajectory, discuss its integration into the demodulator, and review the performance of the new design.Trans Emerging Tel Tech. 2019;30:e3712.wileyonlinelibrary.com/journal/ett

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“…Since radio waves suffer from heavy absorption in water, and poor visibility in many waters excludes optical approaches, only acoustic communication appears suitable. Unfortunately, we found that available acoustic modems [10,16,24,26,27,50,65,70,72,86] cannot be easily integrated in μAUVs such as MONSUN [48] or HippoCampus [30] with tight constraints on size, battery capacity, modifiability, and cost (we elaborate on this in Section 2) or due to availability problems. Furthermore, real-world experiments involving acoustic communication-as, e.g., carried out in References [21,52]-are essential for developing and assessing practical MAC and routing protocols as well as distributed underwater localization and swarm algorithms.…”

Section: Introductionmentioning

confidence: 99%

ahoi

Renner

Heitmann

Steinmetz

2020

ACM Trans. Sen. Netw.

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The recent development of small, cheap AUVs enables a plethora of underwater near-and inshore applications. Among these are monitoring of wind parks, detection of pollution sources, water-quality inspection, and the support of divers during disaster management. These tasks profit from online reporting, control, and AUV swarm interaction; yet they require underwater communication. Unfortunately, commercial devices are prohibitively expensive and typically closed-source, hampering their application in affordable products and research. Therefore, we developed the open-source 1 ahoi acoustic modem. It is (i) small enough to be carried by micro AUVs, (ii) consumes little enough energy to not diminish operation times of its host, (iii) comes at an attractive unit cost below $600, (iv) can reliably communicate at distances of 150 m and more, and (v) supports ranging without additional hardware. Due to its modular build, the modem can be customized and is suitable as research platform to analyze, e.g., MAC and routing protocols. We conducted extensive real-world studies and present results of communication range, packet reception rate, ranging accuracy, and efficient and reliable self-localization. Finally, we draw conclusions regarding acoustic communication, ranging, and localization with inexpensive and low-power devices that go beyond a particular device. Our study, hence, encompasses general insights, observations, and recommendations.

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SeaModem: A low-cost underwater acoustic modem for shallow water communication

Cited by 37 publications

References 4 publications

Wireless Remote Control for Underwater Vehicles

Wireless Remote Control for Underwater Vehicles

Tuning the demodulation frequency based on a normalized trajectory model for mobile underwater acoustic communications

ahoi

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