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Impact of the atmospheric drag on Starlette, Stella, Ajisai, and Lares Orbits / Krzysztof Sosnica in Artificial satellites, vol 50 n° 1 (March 2015)  

Public [article]  inArtificial satellites > vol 50 n° 1 (March 2015) . - pp 1 - 18 Titre : Impact of the atmospheric drag on Starlette, Stella, Ajisai, and Lares Orbits Type de document : Article/Communication Auteurs : Krzysztof Sosnica, Auteur Année de publication : 2015 Article en page(s) : pp 1 - 18 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] élément orbital [Termes IGN] freinage atmosphérique [Termes IGN] orbitographie [Termes IGN] satellite de télémétrie [Termes IGN] télémètre laser sur satellite [Termes IGN] télémétrie laser sur satellite Résumé : (auteur) The high-quality satellite orbits of geodetic satellites, which are determined using Satellite Laser Ranging (SLR) observations, play a crucial role in providing, e.g., low-degree coefficients of the Earth's gravity field including geocenter coordinates, Earth rotation parameters, as well as the SLR station coordinates. The appropriate modeling of non-gravitational forces is essential for the orbit determination of artificial Earth satellites. The atmospheric drag is a dominating perturbing force for satellites at low altitudes up to about 700-1000 km. This article addresses the impact of the atmospheric drag on mean semi-major axes and orbital eccentricities of geodetic spherical satellites: Starlette, Stella, AJISAI, and LARES. Atmospheric drag causes the semi-major axis decays amounting to about ▲a = -1.2, -.12, -.14, and -.30 m/year for LARES, AJISAI, Starlette, and Stella, respectively. The density of the upper atmosphere strongly depends on the solar and geomagnetic activity. The atmospheric drag affects the along-track orbit component to the largest extent, and the out-of-plane to a small extent, whereas the radial component is almost unaffected by the atmospheric drag Numéro de notice : A2015-287 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/arsa-2015-0001 En ligne : https://doi.org/10.1515/arsa-2015-0001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76406 [article]

Modernization of the method of line-line intersection using RTN GNSS technology for determining the position of corners of buildings / Robert Krzyzek in Artificial satellites, vol 50 n° 1 (March 2015)  

Public [article]  inArtificial satellites > vol 50 n° 1 (March 2015) . - pp 41 - 58 Titre : Modernization of the method of line-line intersection using RTN GNSS technology for determining the position of corners of buildings Type de document : Article/Communication Auteurs : Robert Krzyzek, Auteur Année de publication : 2015 Article en page(s) : pp 41 - 58 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] angle [Termes IGN] bâtiment [Termes IGN] intersection spatiale Résumé : (auteur) Carrying out measurements of buildings with RTN GNSS technology in difficult environmental conditions appears to be a major challenge for many surveyors. Achieving the required accuracy of the position of a building structure is often a difficult, and sometimes even an impossible task to perform. This paper presents an innovative solution to increase the reliability of determining the coordinates of building corners, by modernizing the results obtained from the indirect method of measurement of line-line intersection by the socalled half-angle method. Generally speaking, the half-angle method is to verify the angular values in determined points (corners of buildings) from the method of intersection of the base point lines. Optimization of this method involves reducing deformation of a building, which has been determined in real time, taking into account only the classical method of line-line intersection. In order to obtain optimized measurement results, the conversion of the obtained results to the convergent values relative to the most probable coordinates is performed. Based on a detailed comparative and statistical analyses, it can be concluded that the modernized method of line intersection, employed in the RTN GNSS mode with the half-angle method, greatly improves the reliability of determining corners of buildings (X and Y coordinates), as well as provides an exact reflection of the geometric shape of a structure. Numéro de notice : A2015-288 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/arsa-2015-0004 En ligne : https://doi.org/10.1515/arsa-2015-0004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76407 [article]