caa a22 4500 397550901 CHVBK 20180308164750.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.1006/jmsc.1996.0028 doi (NATIONALLICENCE)oxford-10.1006/jmsc.1996.0028 Potential improvements to current methods of recognizing single targets with a split-beam echo-sounder [Elektronische Daten] [Michael Soule, Ian Hampton, Manuel Barange] The precision of in situ target-strength (TS) estimates generated by TS analysers is directly related to the ability of single-target detectors to reject multiple echoes in dense aggregations. The rejection performance of five single-target detection algorithms, utilizing phase, amplitude, and echo duration information from a split-beam echo-sounder as rejection criteria, were tested by simulation for target pairs randomly generated in a three-dimensional resolution volume. Each algorithm was also tested for selection bias. It was found that all five algorithms accept multiple echoes preferentially when they are in phase. Of the phase methods, that which used the standard deviation in phase rejected the multiples most effectively, while the echo duration method performed relatively poorly. A method which relies on the magnitude of amplitude differences between split-beam elements performed well, particularly for stronger targets. Another advantage of this method is that it also preferentially accepts out-of-phase multiples, thus partly compensating for its bias towards multiples which are in phase. We conclude that implementation of algorithms using either the standard phase deviation or the amplitude difference will lead to a significant improvement in single-target detection. The performance of the amplitude difference technique is particularly encouraging, considering the potential improvements possible by using averaging techniques to minimize the influence of noise. © 1996 International Council for the Exploration of the Sea Regular Articles nationallicence simulation nationallicence split-beam nationallicence target strength nationallicence Soule Michael Sea Fisheries Research Institute, Private Bag X2, Roggebay, Cape Town, 8012, South Africa aut Hampton Ian Sea Fisheries Research Institute, Private Bag X2, Roggebay, Cape Town, 8012, South Africa aut Barange Manuel Sea Fisheries Research Institute, Private Bag X2, Roggebay, Cape Town, 8012, South Africa aut ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 237-243 1054-3139 53:2<237 1996 53 icesjms https://doi.org/10.1006/jmsc.1996.0028 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1006/jmsc.1996.0028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Soule Michael Sea Fisheries Research Institute, Private Bag X2, Roggebay, Cape Town, 8012, South Africa aut NATIONALLICENCE 700 1- Hampton Ian Sea Fisheries Research Institute, Private Bag X2, Roggebay, Cape Town, 8012, South Africa aut NATIONALLICENCE 700 1- Barange Manuel Sea Fisheries Research Institute, Private Bag X2, Roggebay, Cape Town, 8012, South Africa aut NATIONALLICENCE 773 0- ICES Journal of Marine Science Oxford University Press 53/2(1996-04), 237-243 1054-3139 53:2<237 1996 53 icesjms Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford