Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786991
C. Desportes, E. Obligis, L. Eymard
In order to correct the altimeter range for tropospheric humidity, a Microwave Radiometer is added to altimetry missions (Envisat/MWR, Jason/JMR, TOPEX-Poseidon/TMR). Over open ocean, the combination altimeter/radiometer is satisfactory. This is not the case in coastal zones, where the signal coming from the surrounding land surfaces contaminates the radiometer measurement and makes the humidity retrieval method unsuitable. In this paper, a radiometer simulator is built. This simulator is used to perform sensitivity tests and to evaluate the current methods to retrieve the wet tropospheric correction in transition areas. After examining simple corrections, we evaluated the feasibility and performances of a method which proposes to take into account the land surface effect in the brightness temperature estimation.
{"title":"On the wet tropospheric correction for altimetry in coastal regions","authors":"C. Desportes, E. Obligis, L. Eymard","doi":"10.1109/PASSIVE.2008.4786991","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786991","url":null,"abstract":"In order to correct the altimeter range for tropospheric humidity, a Microwave Radiometer is added to altimetry missions (Envisat/MWR, Jason/JMR, TOPEX-Poseidon/TMR). Over open ocean, the combination altimeter/radiometer is satisfactory. This is not the case in coastal zones, where the signal coming from the surrounding land surfaces contaminates the radiometer measurement and makes the humidity retrieval method unsuitable. In this paper, a radiometer simulator is built. This simulator is used to perform sensitivity tests and to evaluate the current methods to retrieve the wet tropospheric correction in transition areas. After examining simple corrections, we evaluated the feasibility and performances of a method which proposes to take into account the land surface effect in the brightness temperature estimation.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125969454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786996
N. Juennard, C. Jauffret, B. Xerri
An underwater telescope has been set off Toulon, named Antares for Astronomy with a Neutrino Telescope and Abyss RESearch, composed by vertical hydrophones lines. It is used for the detection and the estimation of direction of arrival of very high energy neutrinos. Very high energy neutrinos can be detected due to a shower they produce in the sea water. This shower is the source of a very short acoustic signal, called Antares signal. We have constructed a global passive detection and localisation system devoted to the acoustic signal emitted after the collision of very high energy particles in sea water. The presented results are encouraging but must be confirmed with sea data.
{"title":"Detection and localization of very high energy neutrinos by a passive underwater acoustic telescope","authors":"N. Juennard, C. Jauffret, B. Xerri","doi":"10.1109/PASSIVE.2008.4786996","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786996","url":null,"abstract":"An underwater telescope has been set off Toulon, named Antares for Astronomy with a Neutrino Telescope and Abyss RESearch, composed by vertical hydrophones lines. It is used for the detection and the estimation of direction of arrival of very high energy neutrinos. Very high energy neutrinos can be detected due to a shower they produce in the sea water. This shower is the source of a very short acoustic signal, called Antares signal. We have constructed a global passive detection and localisation system devoted to the acoustic signal emitted after the collision of very high energy particles in sea water. The presented results are encouraging but must be confirmed with sea data.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132135564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786989
F. Maussang, F. Daout, G. Ginolhac, F. Schmitt
This paper presents research results in space-surface multistatic synthetic aperture radar (SS-MSAR) with non cooperative GPS satellites. The goal of this paper is to characterize such a system in an ISAR context, with a moving ground target.point spread function (PSF) are defined and used in this work to estimate the performance in term of resolution. These criteria are computed, and compared, for several scenarios with targets of different velocities.
{"title":"GPS ISAR passive system characterization using Point Spread Function","authors":"F. Maussang, F. Daout, G. Ginolhac, F. Schmitt","doi":"10.1109/PASSIVE.2008.4786989","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786989","url":null,"abstract":"This paper presents research results in space-surface multistatic synthetic aperture radar (SS-MSAR) with non cooperative GPS satellites. The goal of this paper is to characterize such a system in an ISAR context, with a moving ground target.point spread function (PSF) are defined and used in this work to estimate the performance in term of resolution. These criteria are computed, and compared, for several scenarios with targets of different velocities.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114957535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786993
I. Urazghildiiev, C. Clark
The problem of robust smoothing of position estimates provided by passive localization methods is considered. A new robust statistic is introduced, and the smoothing algorithm is represented in the closed form. The proposed technique is based on a priori information regarding the maximum speed of the animal and the typical accuracy provided by the measuring system. The test results demonstrate that the proposed smoother provides a high degree of position estimate accuracy when more than 50% of the initial position estimates are contaminated by outliers.
{"title":"Robust smoothing to improve position estimates of vocalizing marine mammals","authors":"I. Urazghildiiev, C. Clark","doi":"10.1109/PASSIVE.2008.4786993","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786993","url":null,"abstract":"The problem of robust smoothing of position estimates provided by passive localization methods is considered. A new robust statistic is introduced, and the smoothing algorithm is represented in the closed form. The proposed technique is based on a priori information regarding the maximum speed of the animal and the typical accuracy provided by the measuring system. The test results demonstrate that the proposed smoother provides a high degree of position estimate accuracy when more than 50% of the initial position estimates are contaminated by outliers.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"60 41","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120816837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786995
E. Delory, C. Waldmann, J. Fredericks
The rise of deep-sea observatories across the planet (e.g. NEPTUNE, ESONET/EMSO, MARS, VENUS, DONET) offers an unprecedented opportunity to view ocean acoustic and marine mammal monitoring from a global perspective. It is expected that these observatories will be equipped with hydrophone arrays that will enable real-time acquisition of acoustic data, the amount of which will inevitably accelerate the need for efficient algorithms to reduce the time-bandwidth product to be broadcast over the internet. Though it is expected that the on-going research in acoustic pattern recognition will probably meet the milestone, a major issue remains to make these data computer-usable on a global scale. In order to enhance the potential of marine mammal passive monitoring tools it is therefore necessary that the hosted acoustic monitoring platforms be interoperable, i.e. sensors be discoverable from the internet, data catalogues and sensor metadata be accessible in standard format. Sensor-web enablement (OGC) currently offers an integrated solution through a set of recently approved standards. How these standards may be applicable to the task of interest is discussed and as a result, a global framework and architecture for marine mammal monitoring is presented from the perspective of a globally distributed acoustic monitoring network.
{"title":"A proposed architecture for marine mammal tracking from globally distributed ocean acoustic observatories","authors":"E. Delory, C. Waldmann, J. Fredericks","doi":"10.1109/PASSIVE.2008.4786995","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786995","url":null,"abstract":"The rise of deep-sea observatories across the planet (e.g. NEPTUNE, ESONET/EMSO, MARS, VENUS, DONET) offers an unprecedented opportunity to view ocean acoustic and marine mammal monitoring from a global perspective. It is expected that these observatories will be equipped with hydrophone arrays that will enable real-time acquisition of acoustic data, the amount of which will inevitably accelerate the need for efficient algorithms to reduce the time-bandwidth product to be broadcast over the internet. Though it is expected that the on-going research in acoustic pattern recognition will probably meet the milestone, a major issue remains to make these data computer-usable on a global scale. In order to enhance the potential of marine mammal passive monitoring tools it is therefore necessary that the hosted acoustic monitoring platforms be interoperable, i.e. sensors be discoverable from the internet, data catalogues and sensor metadata be accessible in standard format. Sensor-web enablement (OGC) currently offers an integrated solution through a set of recently approved standards. How these standards may be applicable to the task of interest is discussed and as a result, a global framework and architecture for marine mammal monitoring is presented from the perspective of a globally distributed acoustic monitoring network.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123801091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4787006
S. S. Picart, N. Reul, S. Guimbard, B. Chapron, D. Vandemark
Measurement of ocean surface salinity (SSS) dynamics from space involve precise determination of the dielectric characteristics of seawater through low-noise passive microwave (MW) radiometer measurement of the oceans brightness temperature (TB), optimally performed at a low frequency near 1.4 GHz (L-band). The future SMOS mission is based on such principles and will aim at retrieving SSS with an accuracy of the order of 0.1 psu (practical salinity units). This represents numerous engineering and scientific challenges, in particular because competing terms carried in the ocean TB measurements, foremost being sea surface temperature (SST) and ocean surface roughness, must be accounted for in a new and more robust manner. Prior to launch, we analyze the sensitivity of the future measurements to these factors by looking at somewhat higher frequency C and X-band data (6.8 and 10.7 versus the L-band 1.4 GHz) that are readily available from several recent MW imagers (AMSR-E, TMI, WindSAT). The shift to C and X-bands lowers TB sensitivity to changes in salinity by a large factor of 10-20. To compensate, we performed our study over the Amazon plume region where there are large (100-200 km) and persistent salinity contrasts that exceed the 0.1 psu science salinity requirement by a factor of 10-40 [1]-[2]. This region is of great importance within the salinity mission context due to the large freshwater flux and northward propagating eddies from retroreflection of the North Brazil Current (NBC). The validity of the emissivity/scattering models developed for SMOS at L-band are analyzed at these higher frequencies and our ability to detect these world largest salinity gradients is assessed.
{"title":"Assessing ocean salinity retrieval using WindSAT data over the Amazone river plume and North Brazil Current retroflection","authors":"S. S. Picart, N. Reul, S. Guimbard, B. Chapron, D. Vandemark","doi":"10.1109/PASSIVE.2008.4787006","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4787006","url":null,"abstract":"Measurement of ocean surface salinity (SSS) dynamics from space involve precise determination of the dielectric characteristics of seawater through low-noise passive microwave (MW) radiometer measurement of the oceans brightness temperature (TB), optimally performed at a low frequency near 1.4 GHz (L-band). The future SMOS mission is based on such principles and will aim at retrieving SSS with an accuracy of the order of 0.1 psu (practical salinity units). This represents numerous engineering and scientific challenges, in particular because competing terms carried in the ocean TB measurements, foremost being sea surface temperature (SST) and ocean surface roughness, must be accounted for in a new and more robust manner. Prior to launch, we analyze the sensitivity of the future measurements to these factors by looking at somewhat higher frequency C and X-band data (6.8 and 10.7 versus the L-band 1.4 GHz) that are readily available from several recent MW imagers (AMSR-E, TMI, WindSAT). The shift to C and X-bands lowers TB sensitivity to changes in salinity by a large factor of 10-20. To compensate, we performed our study over the Amazon plume region where there are large (100-200 km) and persistent salinity contrasts that exceed the 0.1 psu science salinity requirement by a factor of 10-40 [1]-[2]. This region is of great importance within the salinity mission context due to the large freshwater flux and northward propagating eddies from retroreflection of the North Brazil Current (NBC). The validity of the emissivity/scattering models developed for SMOS at L-band are analyzed at these higher frequencies and our ability to detect these world largest salinity gradients is assessed.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116512362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786984
X. Mouy, D. Leary, B. Martin, M. Laurinolli
JASCO Applied Sciences provided acoustic data collection services to Shell Offshore Incorporated in support of their explorations of the Chukchi and Beaufort Seas during the summer of 2007. A total of 37 ocean bottom hydrophones data recording systems were deployed resulting in a data set in excess of 5 TB. This data equates to almost 5 years of continuous sound recording. This campaign provided information on the migration routes of the marine mammals, which include bowhead, beluga, humpback, gray whales and walruses. Given the large amount of data, manual analysis of the recordings was not feasible. A method to detect and classify the marine mammal vocalizations automatically in a reasonable amount of time had to be developed. The processing is structured in several steps, (1.) the detection of energy events, (2.) the feature extraction, and (3.) the classification into a species variety. This paper focuses on combining the Gaussian mixed models (GMM) algorithm for classification with attributes taken from two different feature extraction algorithms: cepstral coefficients and wavelets. Combinations of these different algorithms are compared using classification operating characteristic (COC) curves for each species tested. This paper compares the performance of these algorithms and their parameters against a large training data set.
{"title":"A comparison of methods for the automatic classification of marine mammal vocalizations in the Arctic","authors":"X. Mouy, D. Leary, B. Martin, M. Laurinolli","doi":"10.1109/PASSIVE.2008.4786984","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786984","url":null,"abstract":"JASCO Applied Sciences provided acoustic data collection services to Shell Offshore Incorporated in support of their explorations of the Chukchi and Beaufort Seas during the summer of 2007. A total of 37 ocean bottom hydrophones data recording systems were deployed resulting in a data set in excess of 5 TB. This data equates to almost 5 years of continuous sound recording. This campaign provided information on the migration routes of the marine mammals, which include bowhead, beluga, humpback, gray whales and walruses. Given the large amount of data, manual analysis of the recordings was not feasible. A method to detect and classify the marine mammal vocalizations automatically in a reasonable amount of time had to be developed. The processing is structured in several steps, (1.) the detection of energy events, (2.) the feature extraction, and (3.) the classification into a species variety. This paper focuses on combining the Gaussian mixed models (GMM) algorithm for classification with attributes taken from two different feature extraction algorithms: cepstral coefficients and wavelets. Combinations of these different algorithms are compared using classification operating characteristic (COC) curves for each species tested. This paper compares the performance of these algorithms and their parameters against a large training data set.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124446502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4787003
A. Coatanhay, R. Garello, B. Chapron, F. Ardhuin
The main purpose of this paper is to present a new project of research called MOPS dedicated to the use of the GNSS signals for the oceanography and the sea surface monitoring.
本文的主要目的是提出一个新的研究项目，称为MOPS，致力于利用GNSS信号进行海洋学和海面监测。
{"title":"Project MOPS marine opportunity passive systems","authors":"A. Coatanhay, R. Garello, B. Chapron, F. Ardhuin","doi":"10.1109/PASSIVE.2008.4787003","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4787003","url":null,"abstract":"The main purpose of this paper is to present a new project of research called MOPS dedicated to the use of the GNSS signals for the oceanography and the sea surface monitoring.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122414702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786979
O. Carrière, J. Hermand, Y. Stéphan
This work presents a feasibility test of acoustic data assimilation in a basic feature model of the Ushant front, west off Brittany, enabling the tracking of the principal characteristics of the front. Two monitoring applications are presented for tracking the tidal variations of the front and its seasonal variations (from April to July). The data assimilation method is based on ensemble Kalman filtering, enabling the process of the nonlinearity between front parameters and acoustic measurements. To prevent from the resolvability problem inherent to travel-time tomography method in shallow water, the proposed scheme considers full-field acoustic data and a normal-mode propagation model taking into account the seabottom properties. The complex field on a vertical array of receivers is assimilated in the front model to continuously correct the prediction of the front parameters. Simulation results demonstrate the feasibility of the method.
{"title":"Passive tomography in coastal areas: A feasibility study of the Ushant front monitoring","authors":"O. Carrière, J. Hermand, Y. Stéphan","doi":"10.1109/PASSIVE.2008.4786979","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786979","url":null,"abstract":"This work presents a feasibility test of acoustic data assimilation in a basic feature model of the Ushant front, west off Brittany, enabling the tracking of the principal characteristics of the front. Two monitoring applications are presented for tracking the tidal variations of the front and its seasonal variations (from April to July). The data assimilation method is based on ensemble Kalman filtering, enabling the process of the nonlinearity between front parameters and acoustic measurements. To prevent from the resolvability problem inherent to travel-time tomography method in shallow water, the proposed scheme considers full-field acoustic data and a normal-mode propagation model taking into account the seabottom properties. The complex field on a vertical array of receivers is assimilated in the front model to continuously correct the prediction of the front parameters. Simulation results demonstrate the feasibility of the method.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122630704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-01DOI: 10.1109/PASSIVE.2008.4786986
V. Kandia, Y. Stylianou
In this paper we present an alternative way to usual energy based approaches for detecting whale clicks. We suggest the use of the phase spectrum since the information about the location of clicks is very well represented in phase spectra. The method is referred to as the phase slope function. It is shown that the phase slope function is robust to additive noise while it offers simplicity in click detection since it is independent of the click source level. We further discuss its properties regarding the mono-pulse and multi-pulse character of clicks by introducing the notion of center of gravity for clicks. To evaluate the suggested phase based whale click detector we labeled clicks by hand in recordings of sperm and beaked whales provided by the Atlantic Undersea Test and Evaluation Center (AUTEC). Conducting detection tests demonstrate that 88% (on average) of the hand labeled mono-pulsed clicks were detected within an accuracy of less than 1 ms. Regarding the detection of multi-pulsed clicks we were able to detect over 95% of them by considering a multi-pulsed click as one acoustic event and not as a series of pulses.
{"title":"A phase based detector of whale clicks","authors":"V. Kandia, Y. Stylianou","doi":"10.1109/PASSIVE.2008.4786986","DOIUrl":"https://doi.org/10.1109/PASSIVE.2008.4786986","url":null,"abstract":"In this paper we present an alternative way to usual energy based approaches for detecting whale clicks. We suggest the use of the phase spectrum since the information about the location of clicks is very well represented in phase spectra. The method is referred to as the phase slope function. It is shown that the phase slope function is robust to additive noise while it offers simplicity in click detection since it is independent of the click source level. We further discuss its properties regarding the mono-pulse and multi-pulse character of clicks by introducing the notion of center of gravity for clicks. To evaluate the suggested phase based whale click detector we labeled clicks by hand in recordings of sperm and beaked whales provided by the Atlantic Undersea Test and Evaluation Center (AUTEC). Conducting detection tests demonstrate that 88% (on average) of the hand labeled mono-pulsed clicks were detected within an accuracy of less than 1 ms. Regarding the detection of multi-pulsed clicks we were able to detect over 95% of them by considering a multi-pulsed click as one acoustic event and not as a series of pulses.","PeriodicalId":153349,"journal":{"name":"2008 New Trends for Environmental Monitoring Using Passive Systems","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132494475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：