A5058707479- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Geophysical and Geoelectrical Methods
- Reservoir Engineering and Simulation Methods
- GNSS positioning and interference
- Geology and Paleoclimatology Research
- Inertial Sensor and Navigation
- Methane Hydrates and Related Phenomena
- Ionosphere and magnetosphere dynamics
- Oceanographic and Atmospheric Processes
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Frequency and Time Standards
- Geological formations and processes
- Geological and Geophysical Studies
- Health Systems, Economic Evaluations, Quality of Life
- Magnetic Field Sensors Techniques
- nanoparticles nucleation surface interactions
- Soil Geostatistics and Mapping
- Pickering emulsions and particle stabilization
- Seismic Imaging and Inversion Techniques
- Radioactive Decay and Measurement Techniques
- Optical Polarization and Ellipsometry
- Groundwater and Isotope Geochemistry
- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
Service Hydrographique et Océanographique de la Marine
2010-2024
Electronic Product Services (Czechia)
2009
Institut Jean Lamour
2009
École Nationale Supérieure des Mines de Paris
1995
Abstract Measuring gravity from an aircraft or a ship is essential in geodesy, geophysics, mineral and hydrocarbon exploration, navigation. Today, only relative sensors are available for onboard gravimetry. This major drawback because of the calibration drift estimation procedures which lead to important operational constraints. Atom interferometry promising technology obtain absolute gravimeter. But, despite high performances obtained static condition, no precise measurements were reported...
We report an airborne gravity survey with absolute gravimeter based on atom interferometry and two relative gravimeters: a classical LaCoste\&Romberg (L\&R) novel iMAR strap-down Inertial Measurement Unit (IMU). estimated measurement errors for the quantum ranging from 0.6 to 1.3 mGal depending flight conditions filtering used. Similar are obtained strapdown but long term stability is five times worse. The traditional L\&R platform shows larger (3 - 4 mGal). Airborne measurements have been...
Abstract Global gravity models from satellite altimetry missions have widely contributed to the improvement of knowledge over oceans. However, few are available with a validated accuracy model, as most recent V21 V32 Scripps Institution Oceanography (SIO). The aim this paper is propose method estimate any free air anomaly model derived marine data sets. main idea correlate error mean roughness on precise measurement areas. relationship obtained then generalized each point model. This grid...
Abstract We investigate using the GIRAFE cold-atom gravimeter during an airborne gravity survey for improving field and quasigeoid modelling. The study is conducted over Bay of Biscay, France. Geoid/quasigeoid determination usually a major challenge such coastal areas due to scarce inconsistent data. In first step, dataset analysed compared with available surface data as well global altimetry models from UCSD DTU. comparisons indicate that DTU model better than within around 10 km coastline....
Over the past 3 decades, satellite altimetry has been a key tool for dynamic ocean studies and accurately estimating sea surface heights. The geodetic reference surface—the “geoid”—can be approximated as mean height of an corrected terms such tides currents. It is equipotential gravity field; variations this field are quantified free‐air anomalies, from which density heterogeneities oceanic basement can inferred. Using data in combination with other geophysical data, scientists have improved...
Many models describing the Earth's magnetic field exist and are maintained by international research organizations. However, no clear general overview of cross-compared quality these is available. An evaluation internal component anomaly as estimated a selection nine geomagnetic with global coverage presented here. Anomaly also compared an external, independently processed marine dataset extracted from Shom's (the French Hydrographic Oceanographic Service) geophysical database. The...
An iterative Extended Kalman Filter (EKF) approach is proposed to recover a regional set of topographic heights composing an undersea volcanic mount by the successive combination large numbers gravity measurements at sea surface using altimetry satellite-derived grids and taking error uncertainties into account. The integration non-linear Newtonian operators versus radial angular distances (and its first derivatives) enables estimation process accelerate requires only few iterations, instead...
Current profilers and current meters have a magnetic compass tilt sensors for relating measurements to terrestrial reference frame. As compasses are sensitive their environment, they must be calibrated in the configuration which will used. A calibration platform was built, based on method developed 2007, correct angular errors guarantee measurement uncertainty instruments mounted mooring cages.
During the last decades, several inversion approaches have been proposed to derive sea floor topography from satellite-based gravity data. Unfortunately, most accurate non linear ones are based on iterative schemes that remain very time-consuming, especially if number of topographic heights be fitted is important, e.g. when oceanic domain large and/or data geographically dense and thus maximum grid resolution accessible high. Our strategy computation decompose total area into geographical...
Tesseroid and radial columns decomposition of the undersea relief strategies have been considered to recover seafloor topography by Kalman Filter (KF) inversion gravity data in case Great Meteor seamount located North Atlantic ocean. These both modeling approaches are shown be equivalent at high grid sampling rate (<1'). Different types functionals for geoid height anomaly, vertical component gradient (or tensor) analyzed spectral combined retrieve most detailed 3-D solutions, as provide...
Numerical tesseroid and radial-type approaches are presented compared in terms of their efficiency for deriving the regional geoid height, vertical gravity, gradiometric anomalies from sea floor topography grids. The gradient function is particularly suitable representing shorter wavelengths typically less than 10 km. These two modeling methods were applied to Great Meteor guyot Atlantic Ocean using its bathymetry. To optimize computation high-resolution gravity anomalies, Armadillo, GSL,...
Instruments used to measure speed and direction of sea currents are equipped with magnetic compass tilt sensors, in order be able reference their data a terrestrial referential.Compass being sensible environment, it is necessary calibrate currentmeters using configuration.In this order, non-magnetic platform has been built.Reference directions expended uncertainties reached equipment respectively 1 ° 0.32 °. Results obtained during different trials current profilers exposed.
Les applications des phenomenes interfaciaux sont extremement nombreuses et d'une importance economique considerable, pour exemple la catalyse heterogene en petroleochimie, ou miniaturisation systemes industrie electronique. En effet, les atomes se trouvant a surface d'un solide liquide presentent une coordinence moins importante que ceux situes au cœur de ce systeme : ils conferent proprietes tout fait specifiques. Cet article introduit notions thermodynamique surfaces avant focaliser sur...