Accurate GPS measurement of the location and orientation of a floating platform

Purcell, G. H.; Young, Larry; Wolf, Susan Kornreich; Meehan, T. K.; Duncan, Courtney; Fisher, Sharon; Spiess, Fred N.; Austin, G. L.; Boegeman, D. E.; Lowenstein, C. D.

doi:10.1080/15210609009379668

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The positions of seafloor references are determined from these observations and sound-speed structure model of the seawater. This system is basically the same as that described by Purcell et al (1991) and Spiess and Hildebrand (1995). Their system used a circular acoustic transponder array installed on the seafloor and performed acoustic ranging between sea surface and seafloor above the center of the transponder array.…”

Section: System Configurationmentioning

confidence: 99%

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

2014

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Many active plate boundaries, such as mid-ocean ridges and trenches, are under the sea. Seafloor crustal deformation data will contribute significantly to understanding the nature of the tectonic processes at these plate boundaries. We have developed a seafloor positioning system with a GPS-acoustic link. This system consists of two main components; (1) the surface positioning by differential GPS to on-land reference and (2) the precise acoustic ranging using the M-sequence between the surface and seafloor references. The position and attitude of the surface GPS-acoustic link unit are determined from the GPS observations. Simultaneously, the acoustic ranging between the surface unit and seafloor references are carried out. The positions of the seafloor references are determined from these observations and a sound-speed structure model of the seawater. We performed preliminary seafloor positioning experiments. In these experiments, simple 1-D structure models are assumed for the sound-speed in the sea. The results show that the positions of the seafloor references are estimated with an accuracy on order of 10 cm. The residuals for acoustic ranging imply that there are systematic differences between the assumed and real sound-speed structure. It is necessary to reduce the uncertainties of sound-speed structures for more accurate positioning.

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Section: System Configurationmentioning

confidence: 99%

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

2014

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“…Through a combination of GPS and acoustics, this capability can be extended to the seafloor. The GPS-Acoustic (GPSA) approach combines campaign style kinematic GPS on a floating platform (ship or buoy) and acoustic signals from the platform to an array of seafloor transponders (Spiess, 1985;Purcell et al, 1991;Spiess et al, 1998;Osada et al, 2003). Each transponder is interrogated from the center of the array, creating uniformly spaced raypaths at the surface, where the sound speed is most variable.…”

Section: Introductionmentioning

confidence: 99%

Relocation of a seafloor transponder—Sustaining the GPS-Acoustic technique

Gagnon

Chadwell

2007

Earth Planet Sp

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Rigid seafloor arrays of three to four precision acoustic transponders have been repeatedly positioned with the GPS-Acoustic technique to measure horizontal plate motion. In the event that one transponder becomes inactive, a replacement transponder must be precisely located relative to the existing array. Here we present a technique to determine the geodetic azimuth and baseline between the inactive and replacement transponders. We include three examples of relocations between 2002 and 2003 on the Juan de Fuca plate and near the Peru-Chile trench, which add ±16-29 mm uncertainty to the GPS-Acoustic estimated position. A simulation of optimal network geometry shows that the relocation's contribution to uncertainty can be as low as ±10 mm.

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Tsunamis

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Accurate GPS measurement of the location and orientation of a floating platform

Cited by 5 publications

References 2 publications

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

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

Relocation of a seafloor transponder—Sustaining the GPS-Acoustic technique

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