Please use this identifier to cite or link to this item: http://localhost:80/handle/1956/2215
Title: Marine seismics with a pulsed combustion source and Pseudo Noise codes
subject: Correlation;Direct sequence;Impulse seismics;Pseudo noise;Seismic source;Time coding;VDP::Matematikk og Naturvitenskap: 400::Geofag: 450;VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434
Publisher: Springer
Description: There 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.
Peer reviewed
Accepted version
URI: http://localhost:80/handle/1956/2215
More Information: Marine Geophysical Researches 2007 28(2): 109-117
http://hdl.handle.net/1956/2215
10.1007/s11001-007-9018-5
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Marine seismics with a pulsed combustion source and Pseudo Noise codes
subject: Correlation;Direct sequence;Impulse seismics;Pseudo noise;Seismic source;Time coding;VDP::Matematikk og Naturvitenskap: 400::Geofag: 450;VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434
Publisher: Springer
Description: There 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.
Peer reviewed
Accepted version
URI: http://localhost:80/handle/1956/2215
More Information: Marine Geophysical Researches 2007 28(2): 109-117
http://hdl.handle.net/1956/2215
10.1007/s11001-007-9018-5
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Marine seismics with a pulsed combustion source and Pseudo Noise codes
subject: Correlation;Direct sequence;Impulse seismics;Pseudo noise;Seismic source;Time coding;VDP::Matematikk og Naturvitenskap: 400::Geofag: 450;VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Elektromagnetisme, akustikk, optikk: 434
Publisher: Springer
Description: There 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.
Peer reviewed
Accepted version
URI: http://localhost:80/handle/1956/2215
More Information: Marine Geophysical Researches 2007 28(2): 109-117
http://hdl.handle.net/1956/2215
10.1007/s11001-007-9018-5
Appears in Collections:Department of Earth Science

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