Please use this identifier to cite or link to this item: http://dlib.scu.ac.ir/handle/1956/2215
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DC FieldValueLanguage
dc.creatorAskeland, Bjørn-
dc.creatorHobæk, Halvor-
dc.creatorMjelde, Rolf-
dc.date2007-04-18T07:41:32Z-
dc.date2007-04-18T07:41:32Z-
dc.date2007-03-
dc.date.accessioned2019-07-20T06:44:09Z-
dc.date.available2019-07-20T06:44:09Z-
dc.identifierMarine Geophysical Researches 2007 28(2): 109-117-
dc.identifierhttp://hdl.handle.net/1956/2215-
dc.identifier10.1007/s11001-007-9018-5-
dc.identifier.urihttps://bora.uib.no/handle/1956/2215-
dc.descriptionThere has been an ongoing debate for years of how dangerous seismic surveys are with respect to marine life. Marine seismics is today dominated by airgun technology, where high energy is generated by a release of compressed air into the water. The objective of the “Time coded impulse seismic technique” project is to examine whether a new low energy acoustic source can be used for seismic purposes. If the method turns out to be successful, the low output energy and continuous operation will make the source suitable in environmental sensitive areas. The Low level Acoustic Combustion Source (LACS) is a petrol driven pulsed underwater acoustic source. It operates at a few meters depth, and each shot can be digitally controlled from the surface by a computer located in the mother vessel. A presentation of the recorded LACS signal characteristics, the modulation, the Pseudo Noise coding/decoding principles and field test results, is given. The importance of using an optimized code with fine resolution and the near field recording as correlator sequence was demonstrated. Clear correlation peaks could then be seen from the bottom and sub bottom reflectors.-
dc.descriptionPeer reviewed-
dc.descriptionAccepted version-
dc.format798182 bytes-
dc.formatapplication/pdf-
dc.languageeng-
dc.publisherSpringer-
dc.subjectCorrelation-
dc.subjectDirect sequence-
dc.subjectImpulse seismics-
dc.subjectPseudo noise-
dc.subjectSeismic source-
dc.subjectTime coding-
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450-
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434-
dc.titleMarine seismics with a pulsed combustion source and Pseudo Noise codes-
dc.typeJournal Article-
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Full metadata record
DC FieldValueLanguage
dc.creatorAskeland, Bjørn-
dc.creatorHobæk, Halvor-
dc.creatorMjelde, Rolf-
dc.date2007-04-18T07:41:32Z-
dc.date2007-04-18T07:41:32Z-
dc.date2007-03-
dc.date.accessioned2019-07-20T06:44:09Z-
dc.date.available2019-07-20T06:44:09Z-
dc.identifierMarine Geophysical Researches 2007 28(2): 109-117-
dc.identifierhttp://hdl.handle.net/1956/2215-
dc.identifier10.1007/s11001-007-9018-5-
dc.identifier.urihttps://bora.uib.no/handle/1956/2215-
dc.descriptionThere has been an ongoing debate for years of how dangerous seismic surveys are with respect to marine life. Marine seismics is today dominated by airgun technology, where high energy is generated by a release of compressed air into the water. The objective of the “Time coded impulse seismic technique” project is to examine whether a new low energy acoustic source can be used for seismic purposes. If the method turns out to be successful, the low output energy and continuous operation will make the source suitable in environmental sensitive areas. The Low level Acoustic Combustion Source (LACS) is a petrol driven pulsed underwater acoustic source. It operates at a few meters depth, and each shot can be digitally controlled from the surface by a computer located in the mother vessel. A presentation of the recorded LACS signal characteristics, the modulation, the Pseudo Noise coding/decoding principles and field test results, is given. The importance of using an optimized code with fine resolution and the near field recording as correlator sequence was demonstrated. Clear correlation peaks could then be seen from the bottom and sub bottom reflectors.-
dc.descriptionPeer reviewed-
dc.descriptionAccepted version-
dc.format798182 bytes-
dc.formatapplication/pdf-
dc.languageeng-
dc.publisherSpringer-
dc.subjectCorrelation-
dc.subjectDirect sequence-
dc.subjectImpulse seismics-
dc.subjectPseudo noise-
dc.subjectSeismic source-
dc.subjectTime coding-
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450-
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434-
dc.titleMarine seismics with a pulsed combustion source and Pseudo Noise codes-
dc.typeJournal Article-
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Full metadata record
DC FieldValueLanguage
dc.creatorAskeland, Bjørn-
dc.creatorHobæk, Halvor-
dc.creatorMjelde, Rolf-
dc.date2007-04-18T07:41:32Z-
dc.date2007-04-18T07:41:32Z-
dc.date2007-03-
dc.date.accessioned2019-07-20T06:44:09Z-
dc.date.available2019-07-20T06:44:09Z-
dc.identifierMarine Geophysical Researches 2007 28(2): 109-117-
dc.identifierhttp://hdl.handle.net/1956/2215-
dc.identifier10.1007/s11001-007-9018-5-
dc.identifier.urihttps://bora.uib.no/handle/1956/2215-
dc.descriptionThere has been an ongoing debate for years of how dangerous seismic surveys are with respect to marine life. Marine seismics is today dominated by airgun technology, where high energy is generated by a release of compressed air into the water. The objective of the “Time coded impulse seismic technique” project is to examine whether a new low energy acoustic source can be used for seismic purposes. If the method turns out to be successful, the low output energy and continuous operation will make the source suitable in environmental sensitive areas. The Low level Acoustic Combustion Source (LACS) is a petrol driven pulsed underwater acoustic source. It operates at a few meters depth, and each shot can be digitally controlled from the surface by a computer located in the mother vessel. A presentation of the recorded LACS signal characteristics, the modulation, the Pseudo Noise coding/decoding principles and field test results, is given. The importance of using an optimized code with fine resolution and the near field recording as correlator sequence was demonstrated. Clear correlation peaks could then be seen from the bottom and sub bottom reflectors.-
dc.descriptionPeer reviewed-
dc.descriptionAccepted version-
dc.format798182 bytes-
dc.formatapplication/pdf-
dc.languageeng-
dc.publisherSpringer-
dc.subjectCorrelation-
dc.subjectDirect sequence-
dc.subjectImpulse seismics-
dc.subjectPseudo noise-
dc.subjectSeismic source-
dc.subjectTime coding-
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450-
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434-
dc.titleMarine seismics with a pulsed combustion source and Pseudo Noise codes-
dc.typeJournal Article-
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.