A5076004073- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Adaptive optics and wavefront sensing
- Optical Wireless Communication Technologies
- GNSS positioning and interference
- Astro and Planetary Science
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Optical Systems and Laser Technology
- Gamma-ray bursts and supernovae
- Spacecraft Design and Technology
- Advanced Frequency and Time Standards
- Solar and Space Plasma Dynamics
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Space Exploration and Technology
- Ocular and Laser Science Research
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Scientific Measurement and Uncertainty Evaluation
- History and Developments in Astronomy
- Impact of Light on Environment and Health
- Satellite Communication Systems
- Inertial Sensor and Navigation
Observatoire de la Côte d’Azur
2012-2023
Institut de Recherche pour le Développement
2020-2023
Centre National de la Recherche Scientifique
2015-2023
Université Côte d'Azur
2020-2023
Géoazur
2012-2019
For many years, lunar laser ranging (LLR) observations using a green wavelength have suffered an inhomogeneity problem both temporally and spatially. This paper reports on the implementation of new infrared detection at Grasse LLR station describes how telemetry improves this situation. Our first results show that permits us to densify allows measurements during full Moon periods. The link budget improvement leads homogeneous telemetric each retro-reflector. Finally, surprising result is...
Abstract Based on a fully passive space segment, the lunar laser ranging experiment is last of Apollo Lunar Surface Experiments Package to operate. Observations from Grasse station have been made daily basis since first echoes obtained in 1981. In this paper, first, we review principle and technical aspects ranging. We then give brief summary progress at facility (Observatoire de la Côte d'Azur, Calern Plateau French Riviera) echoes. The current performance, driven by use an infrared...
A first free space optical communication campaign was established during June-October 2015 between the NICT SOTA [1], [2] (Small Optical TrAnsponder) instrument flying on Low Earth Orbit satellite SOCRATES and Ground Station (OGS) MeO belonging to Observatoire de la Côte d'Azur (OCA) - GeoAzur. Several links at 10 Mbps have been done 1549 976 nm. The main objectives of this experiment are study laser beam propagation through atmosphere design all sub-systems constituting OGS. This has...
This paper presents a direct comparison between two satellite time transfer techniques: common-view (CV) of satellites from the global positioning system (GPS) constellation, and by laser link (T2L2) through low orbiting Jason-2. We describe briefly both techniques, together with independent relative calibration campaigns links involving four European laboratories. Between same remote scale reference points, mean values calibrated differences GPS CV T2L2 are below 240 ps, standard deviations...
Abstract We present the results of first series successful two-way laser ranging experiments from a ground station, Lunar Laser Ranging (LLR) station in Grasse, France, to spacecraft at lunar distance, Reconnaissance Orbiter (LRO). A 15 × 18 5 cm, 650-g array twelve 32-mm diameter solid corner cubes is mounted on its anti-nadir deck. this small retro-reflector onboard orbiter was challenge compared larger surface retro-reflectors. Grasse measured 67 returns two 6-min sessions September 4,...
T2L2 (Time Transfer by Laser Link), developed both CNES and OCA permits the synchronization of remote ultra stable clocks over intercontinental distances. The principle is derived from laser telemetry technology with a dedicated space equipment deigned to record arrival times pulses at satellite. Using instead radio frequency signals used in classical time transfer techniques (GPS, TWSTFT), realize some links between distant stability few picoseconds accuracy better than 100 ps. From launch...
In collaboration between CNES, NICT, Geoazur, the first successful lasercom link micro-satellite SOCRATES and an OGS in Europe has been established. This paper presents some results of telecom scintillation data analysis for 4 links June & July 2015 SOTA terminal MEO optical ground station (OGS) at Caussols France. The have continuously recorded during passes by using a detector developed laboratory. An irradiance 190 nW/m<sup>2</sup> 430 nW/m<sup>2 </sup>has detected 1549 nm 976...
This article exposes how we improved (by more than a factor of four) the green Lunar Laser Ranging instrumental sensitivity French telemetric station "Observatoire de la Côte d'Azur" in 2012. The primary reason for this success is doubling pulse energy our Nd:YAG laser, reaching now 200 mJ at 10 Hz. first gain due to replacement (inside oscillator cavity) dye cell with CR4+:YAG crystal saturable absorber. Complementary spatial beam profile improvements are also described, regarding...
In collaboration between CNES, NICT, Geoazur, the first successful lasercom link micro-satellite SOCRATES and a non-Japanese OGS has been established. This paper presents some results of telecom scintillation data analysis for 4 links in June & July 2015 SOTA terminal Meo optical ground station (OGS) at Caussols France. The have continuously recorded during passes by using detector developed laboratory. An irradiance 190 nW/m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We report on the implementation of a new infrared detection at Grasse lunar laser ranging station and describe how telemetry improves situation. present our first results reflectors show that permits us to densify observations allows measurements during full moon periods. also benefit obtained Global Navigation Satellite System (GNSS) satellites RadioAstron which have very elliptic orbit.
&lt;p&gt;Geodetic observatories play a fundamental role in the determination of International Terrestrial Reference System releases. They host several geodetic permanent instruments whose coordinates can be determined at centimeter level or better. comprise Global Navigation Satellite (GNSS) antenna/receivers, Laser Ranging (SLR) stations, Very Long Baseline Interferometry (VLBI) telescope and Doppler Orbitography Integrated by (DORIS) beacons. The Calern site Observatoire de la...