Seafloor positioning system with GPS-acoustic link for crustal dynamics observation—a preliminary result from experiments in the sea—

Obana, Koichiro; Katao, Hiroshi; Ando, Masataka

doi:10.1186/bf03352253

Cited by 26 publications

(11 citation statements)

References 15 publications

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“…The resulting experiment demonstrated horizontal positioning repeatability (precision) of less than 5 cm, where the center of a transponder array was estimated to infer crustal motion. Other studies have used similar methods combining high‐precision ship‐based GPS and acoustic range estimation to position transponders in arrays or as single units (Fujita et al, 2006; Obana, Katao, & Ando, 2000; Osada et al, 2003; Sweeney, Chadwell, Hildebrand, & Spiess, 2005; Yamada et al, 2002). The experimental results illustrate that the position of the seafloor instruments can be estimated with a repeatability of better than 20 cm, with some reported precision values of better than 5 cm.…”

Section: Background and Closely Related Workmentioning

confidence: 99%

Passive and active acoustics using an autonomous wave glider

Bingham

Kraus

Howe

et al. 2012

Journal of Field Robotics

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The recently developed wave glider has the potential to be an effective unmanned platform for acoustic applications. We present the results of a variety of experiments that quantify this potential. The radiated self‐noise of the autonomous platform is evaluated using an integrated passive acoustic recorder during a set of field trials off the coast of Hawaii. We present the radiated noise spectra from these trials to illustrate the dependence on hydrophone location and sea state. Using the same instrumentation, we demonstrate the ability of a modified wave glider to detect marine mammals using passive acoustic monitoring techniques. We also evaluate the performance of the wave glider operating as an active acoustic gateway, highlighting the potential of this platform to serve as a navigation reference and communications relay for scientific, industrial, and military subsea assets. To demonstrate the potential of the wave glider platform to support acoustic navigation, we assess the performance of time‐of‐flight range estimation and seafloor transponder localization. These tests were performed using commercial off‐the‐shelf acoustic positioning hardware integrated with the wave glider to illustrate that the low self‐noise of the wave glider makes it possible to achieve acoustic positioning performance similar to previously reported results. Finally, we show that the glider can operate as a station‐keeping surface communications gateway and provide recommendations for its use. © 2012 Wiley Periodicals, Inc.

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Section: Background and Closely Related Workmentioning

confidence: 99%

Passive and active acoustics using an autonomous wave glider

Bingham

Kraus

Howe

et al. 2012

Journal of Field Robotics

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“…The two methods complement each other. Observations of seafloor crustal deformation based on this method have been carried out by many groups (e.g., Spiess et al, 1998;Obana et al, 2000;Asada and Yabuki, 2001; Tadokoro et al, 2001 Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…They collect ranges from the center of the array on the sea surface so that coherent temporal changes in sound speed do not affect the horizontal positioning of the reference point. On the other hand, the approach adopted by Obana et al (2000) and Tadokoro et al (2001) involves positioning of a single seafloor transponder by moving the ship around the seafloor station, as shown schematically in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Error evaluation in acoustic positioning of a single transponder for seafloor crustal deformation measurements

et al. 2014

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The observation of seafloor crustal deformation is very important to understand plate motions, nucleation processes and mechanisms of great interplate earthquakes as well as the activities of submarine volcanoes. We have been developing an observation system for seafloor crustal deformation. This system consists of two main components; (1) kinematic GPS positioning of an observation vessel and (2) accurate acoustic measurements of distances between a transponder attached on the side of the vessel (onboard station) and one located on the ocean bottom (seafloor station). In this study, we performed numerical simulations to estimate measurement errors with acoustic positioning assuming acoustic velocities in the sea water and the distribution of observation points around the single seafloor station. We found that the position of the seafloor station which we can obtain by analyzing travel-time data might have around 18-cm discrepancy with respect to its "true" position. Colombo et al. (2001) reported that the position of the vessel can be determined with about 10-cm error by kinematic GPS positioning. These results indicate that the system should be able to detect seafloor crustal deformation much larger than 28 cm, including pre-, co-, and post-seismic slips due to the large earthquakes at subduction zones, slow and silent earthquakes, etc. Therefore, we emphasize the importance of continuous observations with a nationwide geodetic observational network for seafloor crustal deformation.

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“…Spiess, 1980Spiess, , 1985aPurcell et al, 1990;Fujimoto et al, 1995;Chadwell et al, 1998;Fujimoto et al, 1998;Spiess et al, 1998;Obana et al, 2000;Asada and Yabuki, 2001;Yamada et al, 2002;Chadwell, 2003). The technique consists of two basic components: (i) precise kinematic GPS; and (ii) precise underwater acoustics.…”

Section: T1 T2 T3mentioning

confidence: 99%

Precise, three-dimensional seafloor geodetic deformation measurements using difference techniques

Ando

Tadokoro

2005

Earth Planet Sp

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Crustal deformation on land can now be measured and monitored routinely and precisely using space geodetic techniques. The same is not true of the seafloor, which covers about 70 percent of the earth surface, and is critical in terms of plate tectonics, submarine volcanism, and earthquake mechanisms of plate boundary types. We develop new data processing strategies for quantifying crustal deformation at the ocean floor: single-and double-difference methods. Theoretically, the single difference method can eliminate systematic errors of long period, while the double difference method is able to almost completely eliminate all depth-dependent and spatialdependent systematic errors. The simulations have shown that the transponders on the seafloor and thus the deformation of the seafloor can be determined with the accuracy of one centimeter in the single point positioning mode. Since almost all systematic errors (of temporal or spatial nature) have been removed by the double difference operator, the double difference method has been simulated to be capable of determining the threedimensional, relative position between two transponders on the seafloor even at the accuracy of sub-centimeters by employing and accumulating small changes in geometry over time. While the surveying strategy employed by the Scripps Institution of Oceanography (SIO) requires the ship maintain station, our technique requires the ship to move freely. The SIO approach requires a seafloor array of at least three transponders and that the relative positions of the transponders be pre-determined. Our approach directly positions a single transponder or relative positions of transponders, and thus measures deformation unambiguously.

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Seafloor positioning system with GPS-acoustic link for crustal dynamics observation—a preliminary result from experiments in the sea—

Cited by 26 publications

References 15 publications

Passive and active acoustics using an autonomous wave glider

Passive and active acoustics using an autonomous wave glider

Error evaluation in acoustic positioning of a single transponder for seafloor crustal deformation measurements

Precise, three-dimensional seafloor geodetic deformation measurements using difference techniques

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