Title :
Marine mammal echolocation provides a model of forthcoming bio-oriented sonar
Author :
Akamatsu, Tomonari ; Wang, Ding ; Wang, Kexiong
Author_Institution :
National Res. Inst. of Fisheries Eng., Fisheries Res. Agency, Ibaraki
Abstract :
Cetacean´s sonar is an appropriate model of underwater acoustical sensing technology. Sonar behavior of three free-ranging finless porpoises in an oxbow of the Yangtze River was observed by microdata logger systems attached on the animals. Newly developed acoustic data logger could record porpoise´s sonar pulse events 1000 times every second with the amplitude information. Close correlation between sonar effort and behavioral context could be observed. Frequent use of sonar with various inter-pulse intervals was recorded during quick body movements characterized by spiky change of heaving acceleration. The inter-pulse intervals were precisely controlled to adjust the distance to a remote target, which was similar to the terminal phase in bat´s sonar behavior
Keywords :
bioacoustics; data loggers; oceanographic techniques; sonar; underwater sound; Yangtze River; acoustic data logger; amplitude information; bio-oriented sonar; body movements; cetacean sonar; finless porpoises; inter-pulse intervals; marine mammal echolocation; microdata logger systems; sonar behavior; sonar pulse events; underwater acoustical sensing technology; Acceleration; Acoustic pulses; Animals; Aquaculture; Band pass filters; Flash memory; Frequency; Rivers; Sonar; Underwater acoustics;
Conference_Titel :
OCEANS '04. MTTS/IEEE TECHNO-OCEAN '04
Conference_Location :
Kobe
Print_ISBN :
0-7803-8669-8
DOI :
10.1109/OCEANS.2004.1406514
