EXERTIER , P.

The Earth is a specific body in the Universe. Nowadays, thanks to the high accuracy of the measurements obtained by different techniques of geodesy, its shape, as well as its gravity field, can be described and characterized in a very precise way, with thousands of parameters: the Earth is a spherical body only in a very first approximation!

A short‐arc orbit technique was developed, and a very precise and efficient tool for regional orbit determination with a rigorous error budget is proposed for analyzing the TOPEX/POSEIDON (T/P) and ERS 1 missions. The purpose is to be able to determine very accurately, in some conditions, the local orbit, with a very small error in the radial...

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The study of the relative motion between two very-close non-massive objects has been usually done through Hill equations. More recent approaches use the differences of orbital elements to extrapolate relative motion. In this paper, we present another possible representation of the relative motion. This representation takes advantage of the very...

Celestial Mechanics and Dynamical Astronomy, v. 94, n. 1, p. 83-104, 2006. http://dx.doi.org/10.1007/s10569-005-1472-2

The laser‐based short‐arc technique has been developed in order to avoid local errors which affect the dynamical orbit computation, such as those due to mismodeling in the geopotential. It is based on a geometric method and consists in fitting short arcs (about 4000 km), issued from a global orbit, with satellite laser ranging tracking...

A real alternative to Lagrange point very low perturbed orbits, for universe observation missions, is high eccentric Earth orbits. Combination of high eccentricity and very large semi-major axis leads to orbits with an important part of flight time far from Earth and its perturbations. Modeling this particular relative motion is the scoop of...

The Corsica region of the western Mediterranean, including sites at Ajaccio-Aspretto, Cape Senetosa, and Capraia (Italy), hosts a dedicated, long-term experiment to support absolute calibration of space-borne radar altimeters. The objective of the experiment is to continuously monitor the bias and drift of the altimeter measurement systems. In...

The T2L2 (Time Transfer by Laser Link) project, developed by CNES and OCA will permit the synchronization of remote ultra stable clocks and the determination of their performances over intercontinental distances. The principle of the experiment derives from Satellite Laser Ranging (SLR) technology with dedicated space equipment. T2L2 was...

International audience

Advances in Space Research, v. 36, n. 3, p. 402-411, 2005. http://dx.doi.org/10.1016/j.asr.2005.04.056

Marine Geodesy, v. 27, n. 3-4, p. 631-655, Special Issue on Jason-1 Calibration/Validation, 2004. http://dx.doi.org/10.1080/01490410490902106