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The use of doppler in regions with well defined classical networks, shown on the network of the Federal Republic of Germany / W. Ehrnsperger (31/12/1979)

Public Titre : The use of doppler in regions with well defined classical networks, shown on the network of the Federal Republic of Germany Type de document : Article/Communication Auteurs : W. Ehrnsperger, Auteur ; Helmut Hornik, Auteur ; W. Schlüter, Auteur Congrès : Congrès: IUGG - IAG 1979, 17th general assembly UGGI - AIG (3 - 15 décembre 1979; Canberra, Australie), Auteur Année de publication : 31/12/1979 Importance : 16 p. Format : 21 X 30 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] données Doppler [Termes IGN] République fédérale d'Allemagne [Termes IGN] réseau géodésique local [Termes IGN] traitement de données Index. décimale : 30.60 Géodésie spatiale Résumé : (Auteur) The classical network of the Federal republic of Germany as well as the Doppler campaign "Dödoc" are briefly described. As a first step toward a combined solution of both systems, some test computations on real data have been performed. Especially the question of strengthening and improving the classical net by the Doppler measurements is discussed. Numéro de notice : 52205 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64639

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
52205-01	30.60	Tiré à part	Centre de documentation	Géodésie	Disponible

Modelle zur Ausgleichung von Satellitentriangulationen unter besonderer Berücksichtigung des Zeitfehlers / W. Ehrnsperger (1976)

Public Titre : Modelle zur Ausgleichung von Satellitentriangulationen unter besonderer Berücksichtigung des Zeitfehlers Titre original : [Modèles pour la compensation de la spatiotriangulation en tenant compte des erreurs de temps] Type de document : Thèse/HDR Auteurs : W. Ehrnsperger, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1976 Collection : DGK - C Sous-collection : Dissertationen num. 218 Importance : 120 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9274-7 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] spatiotriangulation Index. décimale : 35.13 Prises de vues par capteurs spatiaux Résumé : (Auteur) On the occasion of practical tasks some problems of the triangu-lation by means of passive satellites are discussed. Firstly the general relations between the observed and the computed quanti-ties are given. Then some models already used are introduced. One of these models is enlarged by admitting timing errors. Two possibilities are investigated: Either the timing error is un-known and constant for each station, or it is unknown and con-stant during one pass only. In spite of the fact that the last statement yields values for the unknown coordinates, the resul-ting configuration is too weak, thus the mean square errors of the adjusted coordinates become too large. This difficulty is overcome by a combined model including timing errors and an ad-justment without timing errors. Two numerical examples for this combined solution are given. Since the accuracy of the stations involved in a geometrical adjustment are often varying rather much, some stochastic problems are investigated. Hence it is re-commended to compute weights and unknowns using two different ways . (Auteur) On the occasion of practical tasks some problems of the triangu-lation by means of passive satellites are discussed. Firstly the general relations between the observed and the computed quanti-ties are given. Then some models already used are introduced. One of these models is enlarged by admitting timing errors. Two possibilities are investigated: Either the timing error is un-known and constant for each station, or it is unknown and con-stant during one pass only. In spite of the fact that the last statement yields values for the unknown coordinates, the resul-ting configuration is too weak, thus the mean square errors of the adjusted coordinates become too large. This difficulty is overcome by a combined model including timing errors and an ad-justment without timing errors. Two numerical examples for this combined solution are given. Since the accuracy of the stations involved in a geometrical adjustment are often varying rather much, some stochastic problems are investigated. Hence it is re-commended to compute weights and unknowns using two different ways . Numéro de notice : 28190 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63537

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
28190-01	35.13	Livre	Centre de documentation	En réserve M-103	Disponible