Study of a wide-angle laser ranging system for relative positioning of ground-based benchmarks with millimeter accuracy |
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Authors: | O Bock M Kasser C Thom J Pelon |
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Institution: | (1) Ecole Supérieure des Géomètres et Topographes-Conservatoire National des Arts et Métiers, Le Mans, France, FR;(2) Lab. d'Optoélectronique et de Microinformatique-Institut Géographique National, 2 av. Pasteur, F-94165 Saint Mandé Cedex, France Tel: +33 1 43 98 83 92; fax: + 33 1 43 98 85 81; e-mail: Olivier.Bock@ign.fr, FR;(3) Service d'Aéronomie-Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Paris, France, FR |
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Abstract: | A wide-angle airborne laser ranging system (WA-ALRS) is developed at the Institut Géographique National (IGN), France, with
the aim of providing a new geodesy technique devoted to large (100 km2) networks with a high density (1 km−2) of benchmarks. The main objective is to achieve a 1-mm accuracy in relative vertical coordinates from aircraft measurements
lasting a few hours. This paper reviews the methodology and analyzes the first experimental data achieved from a specific
ground-based experiment. The accuracy in relative coordinate estimates is studied with the help of numerical simulations.
It is shown that strong accuracy limitations arise with a small laser beam divergence combined with short range measurements
when relatively few simultaneous range data are produced. The accuracy is of a few cm in transverse coordinates and a few
mm in radial coordinates. The results from ground-based experimental data are fairly compatible with these predictions. The
use of a model for systematic errors in the vehicle trajectory is shown to be necessary to achieve such a high accuracy. This
work yields the first complete validation of modelization and methodology of this technique. An accuracy better than 1 mm
and a few mm in vertical and horizontal coordinates, respectively, is predicted for aircraft experiments.
Received: 19 June 1997 / Accepted: 17 February 1998 |
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Keywords: | , Laser ranging,Airborne,Multilateration |
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