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Universaltheodolit und CCD-Kamera, ein unpersönliches Meßsystem für astronomisch-geodätische Beobachtungen / W. Schirmer (1994)

Public Titre : Universaltheodolit und CCD-Kamera, ein unpersönliches Meßsystem für astronomisch-geodätische Beobachtungen Titre original : [Théodolite universel et chambre DTC : un système de mesures à distance pour des observations astro-géodésiques] Type de document : Thèse/HDR Auteurs : W. Schirmer, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1994 Collection : DGK - C Sous-collection : Dissertationen num. 427 Importance : 93 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9470-3 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie [Termes IGN] chambre DTC [Termes IGN] étalonnage d'instrument [Termes IGN] étalonnage de chambre métrique [Termes IGN] instrumentation Kern [Termes IGN] théodolite électronique [Termes IGN] vidéothéodolite Index. décimale : 30.03 Instruments de géodésie Résumé : (Auteur) This doctoral thesis shows how to use an universal theodolite kern DKM 3-A and a ccd-camera as an impersonal measuring system for astro-geodetic observations. The measuring system is established here, calibrated and proved by simultaneous determination of latitude, longitude and azimuth. The first chapter introduces the subject with the given task and a glance at the relevant history. Next is an overview of the measuring system. Chapter 2 deals with the combination and calibration of universal theodolite and ccd-camera, starting with the basic functioning principle of charge coupled devices (ccd) and their use as image aquisitors in video cameras. There are several special items which have to be considered if ccd-sensors are applied to measurements in videometry. The imaging system used here is then described. The third chapter covers the theory of eccentric pointings, that means pointings not centered at the intersection point of the crosshairs of a (video) theodolite. Some existing considerations are reported and uniformly represented. Correct formulae for the transformation of eccentric observations in^o directions are derived in two different ways. They are compared to existing approximations. Some recommendations of how to observe with video theodolites follow from a consideration of pointings in different positions. Chapter 4 considers the special requirements for astro-geodetic observations with a video theodolite. Because stars are moving targets there are some considerations to be made concerning telescope properties, the video imaging techniques and time measurement. Next there is a point determination algorithm selected from existing methods. Its resolution and accuracy are adapted to the used instruments. Lastly, remarks about observation practice and calculation of the results are given. Finally, chapter 5 shows the results, which can be summarized by the characteristic accuracy for simul-taneous star observations: the standard deviations for latitude, longitude and azimuth are better than half an arc second. The differences of the values known from other determinations for the used observation point are also as accurate. Only for longitude (time) is there a systematic difference of 0.3 time seconds, however this can be calibrated. The concluding chapter 6 gives a summary and a short outlook for possible future ideas. Numéro de notice : 28061 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63408

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
28061-01	30.03	Livre	Centre de documentation	En réserve M-103	Disponible
28061-02	30.03	Livre	Centre de documentation	En réserve M-103	Disponible