Wireless radio link design to improve near-shore communication with surface nodes on tidal waters

Gaitán, Miguel Gutiérrez; d’Orey, Pedro M.; Santos, Pedro M.; Ribeiro, Manuel Alector; Pinto, Luis Ramos; Almeida, Luís; Sousa, João Borges de

doi:10.23919/oceans44145.2021.9706046

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…II due to higher flooding velocities in that part of the tidal cycle. Note also that previous work [7] has shown that centimeter-level differences in antenna height can have a significant impact on the channel characteristics.…”

Section: Environmental Dynamicsmentioning

confidence: 82%

Empirical evaluation of short-range wifi vessel-to-shore overwater communications

d’Orey

Gaitán

Santos

et al. 2022

Proceedings of the 16th ACM Workshop on Wireless Network Testbeds, Experimental Evaluation &Amp; CHaracterization

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Unmanned vehicles used in ocean science, defense operations and commercial activities collect large amounts of data that is further processed onshore. For real-time information exchange, the wireless link between the unmanned vehicle and onshore devices must be reliable. In this work, we empirically evaluate a WiFi link between an autonomous underwater vehicle on the surface and an onshore device under real-world conditions. This work allowed i) collecting a large-scale realistic dataset and ii) identifying major factors impairing communication in such scenarios. The TX-RX antenna alignment, the operation mode (manual vs automatic) and varying reflecting surface induced by AUV mobility lead to sudden changes (e.g. nulls) in the received signal strength that can be larger than 20 dB. This study provides useful insights to the design of robust vessel-to-shore short-range communications.

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Section: Environmental Dynamicsmentioning

confidence: 82%

Empirical evaluation of short-range wifi vessel-to-shore overwater communications

d’Orey

Gaitán

Santos

et al. 2022

Proceedings of the 16th ACM Workshop on Wireless Network Testbeds, Experimental Evaluation &Amp; CHaracterization

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“…This section revisits the two-ray propagation model from the perspective of shore-to-shore (S2S) and shore-to-vessel (S2V) RF communication links subject to variations in the water surface level. A similar analysis has been presented before in the literature [23]- [27], but using a simplified version of the two-ray model, and without considering the impact of the intertidal zone. Thus, this section also discusses the geometrical aspects determining if the reflection point (from the two-ray model viewpoint) falls within the intertidal zone, and how this situation may influence the modeling approach.…”

Section: Two-ray Channel Modelmentioning

confidence: 85%

“…Despite some aspects of this phenomenon having been effectively described by the tworay model (e.g. [23]- [27]), further investigations on diverse environmental settings (e.g., estuaries and wetlands), using emerging communication technologies (e.g., LoRa) and/or incorporating precise tidal modeling methods, are still scarce.…”

Section: A Tidal Fadingmentioning

confidence: 99%

“…These different implementation settings imply tides can induce changes on the water level that are in the order of magnitude of the antenna height, possibly intensifying tidal fading and other propagation effects. Although being addressed by a few works in the literature [25]- [27], [29], [31], [32], this issue has been largely ignored in practice and thus represents one of the main targets of our research.…”

Section: A Tidal Fadingmentioning

confidence: 99%

“…From the two-ray model perspective, the rise and fall of water levels will impact the link geometry whenever at least one of the (relative) antenna heights to the surface is modified by the impact of tides [25]- [27]. This can be interpreted as the influence of a water level variation ∆ h that shifts either h t , h r , or both, depending on whether it is an S2S or an S2V link scenario, as shown in Fig.…”

Section: B Two-ray Model Over Tidal Watersmentioning

confidence: 99%

See 2 more Smart Citations

Modeling LoRa Communications in Estuaries for IoT Environmental Monitoring Systems

et al. 2022

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Low-power wide-area networks are extending beyond the conventional terrestrial domain. Coastal zones, rivers, wetlands, among others, are nowadays common deployment settings for Internet-of-Things nodes where communication technologies such as LoRa are becoming popular. In this article, we investigate large-scale fading dynamics of LoRa line-of-sight links deployed over an estuary with characteristic intertidal zones, considering both shore-to-shore and shore-to-vessel communications. We propose a novel methodology for path loss prediction which captures i) spatial, ii) temporal and iii) physical features of the RF signal interaction with the environmental dynamics, integrating those features into the two-ray propagation model. To this purpose, we resort to precise hydrodynamic modeling of the estuary, including the specific terrain profile (bathymetry) at the reflection point. These aspects are key to accounting for a reflecting surface of varying altitude and permittivity as a function of the tide. Experimental measurements using LoRa devices operating in the 868~MHz band show major trends on the received signal power in agreement with the methodology's predictions.

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Two-Ray Model Analysis for Overwater Communication at 28 GHz with Different Heights

Celades-Martínez,

Rodríguez,

Gaitán

et al. 2023

2023 IEEE MTT-S Latin America Microwave Conference (LAMC)

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Wireless radio link design to improve near-shore communication with surface nodes on tidal waters

Abstract: Wireless radio link design to improve near-shore ...

Cited by 4 publications

References 27 publications

Empirical evaluation of short-range wifi vessel-to-shore overwater communications

Empirical evaluation of short-range wifi vessel-to-shore overwater communications

Modeling LoRa Communications in Estuaries for IoT Environmental Monitoring Systems

Two-Ray Model Analysis for Overwater Communication at 28 GHz with Different Heights

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