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A new algorithm for a compact mobile four-hydrophone array “RAPID Array” that displays the dolphin's real-time direction data on a graphical user interface (GUI) was proposed to accurately estimate the number of Ganges river dolphins from acoustic data recorded during the census. By considering the trajectory changes in dolphins' click data depending on the time (t) and azimuth (θ) in the coordinate...
For increasing the accuracy of quantitative analysis of the census data of Ganges river dolphins that inhabit and migrate over a long tract of the river stretches in the Ganges river system, a balloon with a video camera system was developed for supporting the census using fusion of acoustic and visual census which was previously proposed by authors [1]. The developed balloon with the camera system...
An advanced and accurate census methodology that fuses acoustic and visual census of the freshwater dolphins has been successfully introduced for the Ganges river dolphins that inhabit and migrate in a long tract of the Ganges river system. In order to conduct an accurate census of the dolphins, an acoustic array system with provision to display the dolphin's real-time direction data on a GUI (Graphical...
Around 15–20 Ganges river dolphins (platanista gangetica) inhabit the 12-km stretch from Karnavas to Narora Barrage in the Ganges river system. However, more than 10 dolphins were carried away downstream after the flood of June-July 2013. In order to urgently conduct a quick census to secure the dolphins in the original habitat, the existing compact four-hydrophone array system (J-Array) was remodeled...
The authors have been developing an acoustic observation system that can record the high-frequency bio-sonar clicks of Ganges river dolphins and can estimate their 3D location in real time. In order to expand the coverage of the acoustic measurement, we deployed and installed one more hydrophone array system about 100 meters away from the original observation system. Combining the measurement results...
For understanding the Ganges river dolphin's (Platanista gangetica) echolocation strategies and underwater behavior for a long-term span, targeting 15–18 Ganges river dolphins including calves, the annual long-term in-situ monitoring using the passive acoustic system (a 6-hydrophone array) has been conducted for 4 consecutive seasons, i.e. four monitoring phases, since November 2008. Recorded data...
The authors have been developing an acoustic observation system that can record the high frequency bio-sonar clicks of the Ganges river dolphins and can estimate their 3-D location in real-time. In order to expand the coverage of the acoustic measurement, a new integrated observation system, which consists of one main array system and the newly developed multiple small array system, is proposed. For...
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