F. Gibert
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View article: Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses
Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses Open
LISA Pathfinder was a mission designed to test key technologies required for gravitational wave detection in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime, which corresponds to …
View article: Precision measurements of the magnetic parameters of LISA Pathfinder test masses
Precision measurements of the magnetic parameters of LISA Pathfinder test masses Open
International audience
View article: Improved Inland Water Level Estimates with Sentinel-6 Fully Focused SAR Processing: A Case Study in the Ebre River Basin
Improved Inland Water Level Estimates with Sentinel-6 Fully Focused SAR Processing: A Case Study in the Ebre River Basin Open
The observation of small to medium inland water targets with nadir radar altimeters is currently limited by the along-track resolution of UnFocused SAR (UFSAR) altimetry, which is approximately 300 m for Delay-Doppler processors. In this s…
View article: Accelerated Algorithm for Back-Projection Fully Focused SAR Altimetry
Accelerated Algorithm for Back-Projection Fully Focused SAR Altimetry Open
Fully focused synthetic aperture radar (SAR) back-projection algorithms for radar altimetry have gained attention in the altimetry community due to their improved azimuth resolution compared to traditional methods, such as the delay/Dopple…
View article: Tilt-to-length coupling in LISA Pathfinder: Long-term stability
Tilt-to-length coupling in LISA Pathfinder: Long-term stability Open
The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We sho…
View article: In-depth analysis of LISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for LISA
In-depth analysis of LISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for LISA Open
We present an in-depth analysis of the LISA Pathfinder differential acceleration performance over the entire course of its science operations, spanning approximately 500 days. We find: (1) The evolution of the Brownian noise that dominates…
View article: Tilt-to-length coupling in LISA Pathfinder: long-term stability
Tilt-to-length coupling in LISA Pathfinder: long-term stability Open
The tilt-to-length coupling during the LISA Pathfinder mission has been\nnumerically and analytically modeled for particular timespans. In this work, we\ninvestigate the long-term stability of the coupling coefficients of this noise.\nWe s…
View article: Precision measurements of the magnetic parameters of LISA Pathfinder test masses
Precision measurements of the magnetic parameters of LISA Pathfinder test masses Open
A precise characterization of the magnetic properties of LISA Pathfinder free falling test-masses is of special interest for future gravitational wave observatory in space. Magnetic forces have an important impact on the instrument sensiti…
View article: Nano-Newton electrostatic force actuators for femto-Newton-sensitive measurements: System performance test in the LISA Pathfinder mission
Nano-Newton electrostatic force actuators for femto-Newton-sensitive measurements: System performance test in the LISA Pathfinder mission Open
Electrostatic force actuation is a key component of the system of geodesic reference test masses (TM) for the LISA orbiting gravitational wave observatory and in particular for performance at low frequencies, below 1 mHz, where the observa…
View article: Ocean-wave retrieval from Sentinel-6 radar altimeter cross-spectra
Ocean-wave retrieval from Sentinel-6 radar altimeter cross-spectra Open
Swell, as a fundamental component of wave dynamics, plays an important role in oceanographic systems. These long-period waves, generated by distant storms and weather systems, travel vast distances across open waters, impacting coastal env…
View article: Sensor noise in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>L</mml:mi><mml:mi>I</mml:mi><mml:mi>S</mml:mi><mml:mi>A</mml:mi></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>P</mml:mi><mml:mi>a</mml:mi><mml:mi>t</mml:mi><mml:mi>h</mml:mi><mml:mi>f</mml:mi><mml:mi>i</mml:mi><mml:mi>n</mml:mi><mml:mi>d</mml:mi><mml:mi>e</mml:mi><mml:mi>r</mml:mi></mml:mrow></mml:math>: Laser frequency noise and its coupling to the optical test mass readout
Sensor noise in : Laser frequency noise and its coupling to the optical test mass readout Open
The (LPF) mission successfully demonstrated the feasibility of the technology needed for the future space borne gravitational wave observatory LISA. A key subsystem under study was the laser interferometer, which measured the changes in re…
View article: A Fully Focused SAR Omega-K Closed-Form Algorithm for the Sentinel-6 Radar Altimeter: Methodology and Applications
A Fully Focused SAR Omega-K Closed-Form Algorithm for the Sentinel-6 Radar Altimeter: Methodology and Applications Open
The 2-D frequency-based omega-K method is known to be a suitable algorithm for fully focused SAR (FF-SAR) radar altimeter processors, as its computational efficiency is much higher than equivalent time-based alternatives without much perfo…
View article: NanoNewton electrostatic force actuators for femtoNewton-sensitive measurements: system performance test in the LISA Pathfinder mission
NanoNewton electrostatic force actuators for femtoNewton-sensitive measurements: system performance test in the LISA Pathfinder mission Open
Electrostatic force actuation is a key component of the system of geodesic reference test masses (TM) for the LISA orbiting gravitational wave observatory and in particular for performance at low frequencies, below 1 mHz, where the observa…
View article: HYDROCOASTAL SAR Altimetry Final Product: L3
HYDROCOASTAL SAR Altimetry Final Product: L3 Open
View article: Tilt-to-length coupling in LISA Pathfinder: A data analysis
Tilt-to-length coupling in LISA Pathfinder: A data analysis Open
We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass…
View article: Charging of free-falling test masses in orbit due to cosmic rays: Results from <i>LISA Pathfinder</i>
Charging of free-falling test masses in orbit due to cosmic rays: Results from <i>LISA Pathfinder</i> Open
A comprehensive summary of the measurements made to characterize test-mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the gra…
View article: Water Surface Height Measurements with Sentinel-6 Fully-Focussed SAR Over Inland Targets
Water Surface Height Measurements with Sentinel-6 Fully-Focussed SAR Over Inland Targets Open
The Sentinel-6 mission, launched in November 2020 is a satellite mission carrying an altimeter operating in open-burst, the Poseidon-4 altimeter. This altimeter has a PRF of approximately 9 kHz, able to perform focussing of whole target ob…
View article: ¿Why should we process Fully-Focused Radar Altimetry data in near real time? Improving the computational efficiency of FF-SAR using Omega-K based algorithm.
¿Why should we process Fully-Focused Radar Altimetry data in near real time? Improving the computational efficiency of FF-SAR using Omega-K based algorithm. Open
The Copernicus Sentinel-6 mission was planned to keep studying the sea-surface height and ocean state measurements and since April 2022 its first satellite, the Sentinel-6 Michael Freilich (S6MF), has become the current reference altimetry…
View article: Water Extent Measurements with Sentinel-6 Fully - Focussed SAR data
Water Extent Measurements with Sentinel-6 Fully - Focussed SAR data Open
The Sentinel-6 mission, launched in November 2020, carries a radar altimeter operating in open burst with a PRF high enough (~9kHz) to perform the focussing of whole target observation echoes in a fully coherent way. Furthermore, such a fe…
View article: A Trihedral Corner Reflector for Radar Altimeter Calibration
A Trihedral Corner Reflector for Radar Altimeter Calibration Open
A trihedral corner reflector has been used to evaluate the capability of passive reflectors to calibrate radar altimeters such as the Poseidon-4 altimeter on board Sentinel-6A. The reflector location, placed on the top of a mountain ridge …
View article: Sensor noise in <i>LISA Pathfinder</i>: An extensive in-flight review of the angular and longitudinal interferometric measurement system
Sensor noise in <i>LISA Pathfinder</i>: An extensive in-flight review of the angular and longitudinal interferometric measurement system Open
In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA’s LISA Pathfinder mission, and have shown the residual sensor noise to be on the level of 32.0+2.4?1.7 fm/?Hz. This review p…
View article: Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin Open
We present an in depth analysis of the transient events, or glitches, detected at a rate of about one per day in the differential acceleration data of LISA Pathfinder. We show that these glitches fall in two rather distinct categories: fas…
View article: Results of the Dragon 4 Project on New Ocean Remote Sensing Data for Operational Applications
Results of the Dragon 4 Project on New Ocean Remote Sensing Data for Operational Applications Open
This paper provides an overview of the Dragon 4 project dealing with operational monitoring of sea ice and sea surface salinity (SSS) and new product developments for altimetry data. To improve sea ice thickness retrieval, a new method was…
View article: Sensor Noise in <i>LISA Pathfinder</i>: In-Flight Performance of the Optical Test Mass Readout
Sensor Noise in <i>LISA Pathfinder</i>: In-Flight Performance of the Optical Test Mass Readout Open
We report on the first subpicometer interferometer flown in space. It was part of ESA's Laser Interferometer Space Antenna (LISA) Pathfinder mission and performed the fundamental measurement of the positional and angular motion of two free…
View article: In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic
In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic Open
View article: Analysis of the accuracy of actuation electronics in the laser interferometer space antenna pathfinder
Analysis of the accuracy of actuation electronics in the laser interferometer space antenna pathfinder Open
The Laser Interferometer Space Antenna Pathfinder (LPF) main observable, labeled Δg, is the differential force per unit mass acting on the two test masses under free fall conditions after the contribution of all non-gravitational forces ha…
View article: Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder
Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder Open
LISA Pathfinder (LPF) has been a space-based mission designed to test new technologies that will be required for a gravitational wave observatory in space. Magnetically driven forces play a key role in the instrument sensitivity in the low…
View article: LISA Pathfinder
LISA Pathfinder Open
Since the 2017 Nobel Prize in Physics was awarded for the observation of gravitational waves, it is fair to say that the epoch of gravitational wave astronomy (GWs) has begun. However, a number of interesting sources of GWs can only be obs…
View article: Novel methods to measure the gravitational constant in space
Novel methods to measure the gravitational constant in space Open
We present two novel methods, tested by LISA Pathfinder, to measure the gravitational constant G for the first time in space. Experiment 1 uses electrostatic suspension forces to measure a change in acceleration of a test mass due to a dis…
View article: Micrometeoroid Events in LISA Pathfinder
Micrometeoroid Events in LISA Pathfinder Open
The zodiacal dust complex, a population of dust and small particles that pervades the solar system, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. We present a new set of data ob…