Long-term real-time monitoring system for Ganges river dolphins using two sets of 6-hydrophone array systems

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 of the two array systems, we successfully obtained improved estimates of acoustic positions of the sound source compared to using a single standalone measurement.