FN Archimer Export Format
PT J
TI High-Resolution Gravity Measurements on Board an Autonomous Underwater Vehicle: Data Reduction and Accuracy Assessment
BT 
AF Vu, Dinh Toan
   Verdun, Jérôme
   Cali, José
   Maia, Marcia
   Poitou, Charles
   Ammann, Jerome
   Roussel, Clement
   D’Eu, Jean-François
   Bouhier, Marie-Edith
AS 1:1,2,3;2:2;3:2;4:1;5:1;6:1;7:2;8:4;9:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:PDG-DFO-SM-PRAO;
C1 Geo-Ocean, UMR 6538 CNRS-IFREMER-UBO-UBS, IUEM, University of Brest, 29280 Plouzané, France
   Laboratoire Géomatique et Foncier (GeF) UR 4630, Conservatoire National des Arts et Métiers (Cnam), HESAM Université, École Supérieure d’Ingénieurs Géomètres Topographes (ESGT), 1 Boulevard Pythagore, 72000 Le Mans, France
   Geodesy and Environment Research Group (GaE), Department of Geodesy, Hanoi University of Mining and Geology, Hanoi 10000, Vietnam
   Mappem Geophysics, Bâtiment Tech-Iroise, 1 rue des Ateliers, Zone de Mespaol, 29290 Saint-Renan, France
   Service Positionnement, Robotique, Acoustique et Optique (PDG-DFO-SM-PRAO), IFREMER Centre Méditerranée, Zone Portuaire de Brégaillon, CEDEX CS20 330, 83507 La Seyne-sur-Mer, France
C2 UBO, FRANCE
   CNAM ESGT, FRANCE
   UNIV HANOI, VIETNAM
   MAPPEM GEOPHYSICS, FRANCE
   IFREMER, FRANCE
SI TOULON
SE PDG-DFO-SM-PRAO
UM GEO-OCEAN
IN WOS Ifremer UPR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 5
TC 1
UR https://archimer.ifremer.fr/doc/00875/98648/108121.pdf
LA English
DT Article
DE ;underwater gravimeter;underwater gravimetry;downward continuation;temperature correction;temperature stabilisation;Kalman filter;submarine structures
AB Gravity on Earth is of great interest in geodesy, geophysics, and natural resource exploration. Ship-based gravimeters are a widely used instrument for the collection of surface gravity field data in marine regions. However, due to the considerable distance from the sea surface to the seafloor, the spatial resolution of surface gravity data collected from ships is often insufficient to image the detail of seafloor geological structures and to explore offshore natural minerals. Therefore, the development of a mobile underwater gravimetry system is necessary. The GraviMob gravimeter, developed for a moving underwater platform by Geo-Ocean (UMR 6538 CNRS-Ifremer-UBO-UBS), GeF (UR4630, Cnam) and MAPPEM Geophysics, has been tested over the last few years. In this study, we report on the high-resolution gravity measurements from the GraviMob system mounted on an Autonomous Underwater Vehicle, which can measure at depths of up to several kilometres. The dedicated GraviMob underwater gravity measurements were conducted in the Mediterranean Sea in March 2016, with a total of 26 underwater measurement profiles. All these measurement profiles were processed and validated. In a first step, the GraviMob gravity measurements were corrected for temperature based on a linear relationship between temperature and gravity differences. Through repeated profiles, we acquired GraviMob gravity measurements with an estimated error varying from 0.8 to 2.6 mGal with standard deviation after applying the proposed temperature correction. In a second step, the shipborne gravity data were downward continued to the measurement depth to validate the GraviMob measurements. Comparisons between the corrected GraviMob gravity anomalies and downward continued surface shipborne gravity data revealed a standard deviation varying from 0.8 to 3.2 mGal and a mean bias value varying from −0.6 to 0.6 mGal. These results highlight the great potential of the GraviMob system in measuring underwater gravity. 
PY 2024
PD FEB
SO Remote Sensing
SN 2072-4292
PU MDPI AG
VL 16
IS 3
UT 001159141500001
DI 10.3390/rs16030461
ID 98648
ER

EF