A5052422740- Underwater Vehicles and Communication Systems
- Underwater Acoustics Research
- Energy Efficient Wireless Sensor Networks
- Energy Harvesting in Wireless Networks
- Distributed Control Multi-Agent Systems
- Indoor and Outdoor Localization Technologies
- Cryospheric studies and observations
- Target Tracking and Data Fusion in Sensor Networks
- Marine animal studies overview
- Fish Ecology and Management Studies
- Maritime Ports and Logistics
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Opportunistic and Delay-Tolerant Networks
- Maritime Navigation and Safety
- Coral and Marine Ecosystems Studies
- Adaptive Control of Nonlinear Systems
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
Stockholm University
2024-2025
KTH Royal Institute of Technology
2017-2022
Swedish Defence Research Agency
2019-2022
In this article, the problem of collaborative tracking an underwater target using autonomous surface vehicles (ASVs) is studied. Distance-based formation control with a collision-avoidance potential function employed as solution. A protocol devised and applied to problem. With protocol, form desired around moving in order continuously estimate its position, while centroid tracks target. Almost global stability proved for case three agents. fully operational platform four ASVs was built...
ABSTRACT In Arctic alpine regions, glacio‐lacustrine environments respond sensitively to variations in climate conditions, impacting, for example,glacier extent and rendering former ice‐contact lakes into ice distal vice versa. Lakefloors may hold morphological records of past glacier extent, but remoteness long periods cover on such make acquisition high‐resolution bathymetric datasets challenging. Lake Tarfala Kebnepakte Glacier, located the Kebnekaise mountains, northern Sweden, comprise...
With regards to energy constrained Autonomous Underwater Vehicles (AUVs), and difficulties inherent the acoustic underwater communication channel, a non-coherent method is investigated in order improve consumption reliability over traditional Frequency Shift Keying (FSK), without increasing bandwidth. A proposed of adapting Trellis Coded Modulation (TCM) constant amplitude Permutated (PFSK) symbol constellations evaluated. system implementation two PFSK methods simulated an Additive White...
This paper addresses the source localization problem of an acoustic fish-tag using Time-of-Arrival measurement signal, transmitted by fish-tag. The measurements denote pseudo-range information between receiver and fish-tag, except that Time-of-Transmission signal is unknown. Starting with equation, a globally valid quasi-linear time-varying model presented independent signal. Using this model, Uniformly Globally Asymptotically Stable (UGAS), three stage estimation strategy (eXogenous Kalman...
This paper proposes a distributed, JANUS-based protocol that enables an underwater acoustic network to reach consensus on arbitrary local opinions as numeric state variables. An envisioned scenario where nodes shall agree parameters describing the environment is used evaluate protocol. The exemplifies protocol's potential in future applications use description decide appropriate modulation and coding schemes. evaluation based numerical simulations sea experiments challenging environment....
The Sjuøyane archipelago is the northernmost land area of Svalbard; thus, it provides a window to study terrestrial glacial history and dynamics Svalbard–Barents Sea Ice Sheet complement marine geological studies in region. To reconstruct Sjuøyane, we describe coastal sedimentary sections Quaternary sediments constrain their chronology by radiocarbon optically stimulated luminescence ages. Erratic boulders bedrock are sampled for 10 Be cosmogenic exposure dating, aiming determine...
In this study, we present the first iteration of DPower, an energy conserving method for use in underwater acoustic networks. The encompasses a straightforward transmission power calibration procedure and adaptive level selection. was evaluated combination with DFlood, known validated constrained flooding protocol developed applications. Simulations network given prerequisites have shown that, acceptable increase packet loss, presented can dramatically reduce consumption thus improve life-time
To make full use of the underwater acoustic channel, a high degree adaptivity is typically required. A novel framework for efficient evaluation link adaptation employing channel replay simulation with Watermark and lookup table proposed. The approach used to compare based on SNR CRC feedback using measured sea data. best performance obtained criterion since it detects if communication has poor behaviour. method further improved by introducing memory mechanism that disables repeated low reliability.
Systems of heterogeneous underwater vehicles and sensor platforms are being used in various applications. Although these systems still deployed at a relatively small scale, rapid technological development is progress, significant impact approaching. To large degree, this driven by desire to utilize the oceans for sustainable food, energy, environmental monitoring. Vehicles communicate wirelessly using acoustic signals due limited range radio signals. form networks, must same frequency use...