Study of a wide-angle laser ranging system for relative positioning of ground-based benchmarks with millimeter accuracy

Autor: M. Kasser, Olivier Bock, C. Thom, Jacques Pelon
Přispěvatelé: École supérieure des géomètres et topographes (ESGT-CNAM), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Laboratoire d'opto-électronique et de micro-informatique (LOEMI), Ecole nationale des sciences géographiques (ENSG), Institut géographique national [IGN] (IGN)-Institut géographique national [IGN] (IGN), Université Pierre et Marie Curie - Paris 6 (UPMC)
Jazyk: angličtina
Rok vydání: 1998
Předmět:
Zdroj: Journal of Geodesy
Journal of Geodesy, 1998, 72 (7-8), pp.442-459. ⟨10.1007/s001900050184⟩
ISSN: 0949-7714
1432-1394
DOI: 10.1007/s001900050184⟩
Popis: A wide-angle airborne laser ranging system (WA-ALRS) is developed at the Institut Geographique 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.
Databáze: OpenAIRE
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