On the Consistency of the Station Coordinates

Schriftenreihe
des Instituts für Geodäsie

Heft 20-1/1985


 
On the Consistency of the Station Coordinates
Derived from Satellite Doppler Observations

József Ádám
Satellite Geodetic Observatory, Budapest / Hungary

 

In: WELSCH, Walter M. / LAPINE, Lewis A. (Hrsg.) [1985]:
International Federation of Surveyors - FIG -
Proceedings Inertial, Doppler and GPS Measurements for National and Engineering Surveys
Joint Meeting of Study Groups 5B and 5C, July 1-3, 1985

Schriftenreihe Universitärer Studiengang Vermessungswesen, Universität der Bundeswehr München, Heft 20-1, Neubiberg, S. 123-144.
 



Abstract

The reliability of the satellite Doppler technique for accurate positioning has been proved in many national and international Doppler observation campaigns. Experiences with Doppler satellite geodetic techniques show that, with different models and softwares, slight differences in station coordinatee do occur. Very small differences in chord lenghts give a good impression of the internal consistency of the Doppler satellite networks. Observations at identical points during several campaigns result in coordinate variations from campaign to campaign using both Broadcast Ephemeris /BE/ and Precise Ephemeris /PE/. Time series analysis of the coordinates derived from long series of Doppler observation data at different sites indicates systematic variations on the station coordinates.

Since the availability of the PE is restrictive, for some countries and campaigns only the BE can be used for geodetic applications. Hence it is necessary to know what are the internal consistency, long-term stability and external errors of the station coordinates evaluated from the BE, what are the coordinate differences between the results of BE and PE solutions, etc. It is very important for us therefore to know what the resulting positions mean.

In this paper the results of some observation campaigns /Hungarian Doppler Observation Campaigns; HDOC80 and HDOC82 in particular/ from the viewpoint of internal consistency are outlined. The results of the least squares spectral analysis of Doppler station height coordinates at station Penc, Hungary as well as a multiple time series analysis of the height series of stations Bruxelles /Belgium/, Graz-Lustbühel /Austria/, Wettzell /FRG/ and Penc /Hungary/ are shortly summarized. The paper further deals with the precision and accuracy of both BE and PE coordinate systems obtained through Doppler surveys and also their interrelationship.
 



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