Advancements in oceanic research have resulted in a plethora of activities such as undersea oil/gas exploration, environmental monitoring, sonar-based coastal surveillance, which have each increased the acoustic noise levels in the ocean and have raised concerns in the scientific community about the effect of human-generated sounds on marine life. Knowledge of the statistical characteristics of...

Underwater Acoustic (UWC) Communication techniques are an interesting area of communication research, in which achieving high data rate, low latency and high throughput is challenging task. In this paper, we used the OFDM multicarrier modulation technique which is suitable for underwater acoustic communication for highly limited bandwidth to enhance the data rate at the receiver. We used effici...

In this paper, an underwater ambient noise (UWAN) removing framework based on generative adversarial network (GAN) to recover underlying ship-engine data is proposed. Unlike previously reported GAN-based denoising techniques, the proposed ambient-noise GAN (UWAR-GAN) modelled using both, log magnitudes as well phase information with significant time-frequency resolution. The as-developed integr...

Passive acoustic detection is being increasingly used to monitor visually cryptic cetaceans such as Blainville's beaked whales (Mesoplodon densirostris) that may be especially sensitive to underwater sound. The efficacy of passive acoustic detection is traditionally characterized by the probability of detecting the animal's sound emissions as a function of signal-to-noise ratio. The probability...

The ambient sound field contains information about the processes generating the sound and the intervening media modifying the sound. This research seeks to demonstrate measurement of useful ocean surface processes using passive measurements of the high frequency underwater ambient sound field. This will allow passive monitoring of environmental conditions from simple and robust sensors, namely ...

In the ocean, the dominant seismoacoustic noise source mechanism varies greatly across frequencies from ocean wave generated microseisms (0.05Hz-0.2Hz) to sea-surface noise (above 1kHz), including noise generated by human or biological activities. Though incoherent imaging with ocean ambient noise has been demonstrated (e.g. daylight imaging), a goal of this research is to use ambient noise, an...

Underwater ambient noise measurements were carried out in a shallow (15-20 m) brackish water in the archipelago of the Gulf of Finland for period of 1 year. The absence of traffic noise made it possible to study wind driven effects in ambient noise at lower frequencies. The ambient noise comes mostly from local sources and the propagation effects are shown to be negligible. The ambient noise de...

The objective of this project is to develop an ambient noise sonar system which can be mounted to an autonomous underwater vehicle or used as a stand alone platform to carry out noise surveys, track vehicles, to use sources of opportunity for target detection and image bubbles underneath breaking waves. The system is also being used to study the ambient noise in the South Florida Test Facility....

Underwater acoustic communication is a core enabling technology with applications in ocean monitoring using remote sensors and autonomous underwater vehicles. One of the more challenging underwater acoustic communication channels is the medium-range very shallow warm-water channel, common in tropical coastal regions. This channel exhibits two key features-extensive time-varying multipath and hi...

Underwater optical environments are seriously affected by various optical inputs, such as artificial light, sky light, and ambient scattered light. The latter two can block underwater object segmentation tasks, since they inhibit the emergence of objects of interest and distort image information, while artificial light can contribute to segmentation. Artificial light often focuses on the object...