Heft 19/1986

des Instituts für Geodäsie

Heft 19/1986

LANDAU, Herbert /
HEIN, Günter W.

GPS Research 1985 at the Institute of Astronomical and Physical Geodesy

208 S.

Auflage:  800

ISSN:  0173-1009





Preface 3
Hein, Günter W. / Eissfeller, Bernd
     The Basic Observation Equations of Carrier Phase
     Measurements to the Global Positioning System
     Including General Orbit Modelling

Eissfeller, Bernd
     A Taylor Series Expansion for the Transformation
     Problem of Cartesian Baseline Components Into
     Ellipsoidal Coordiante Differences

Landau, Herbert / Eissfeller, Bernd
     Optimization of GPS Satellite Selection for High Precision
     Differential Positioning

Eissfeller, Bernd
     The Estimation of Orthometric Heights from GPS Baseline
     Vectors Using Gravity Field Information and Least-Squares

Landau, Herbert
     GPS Baseline Vectors in a Threedimensional Integrated
     Adjustment Approach

Landau, Herbert
     The IAPG Phase-Difference Processing Program
     - Modelling, Software Development and Results -

Landau, Herbert / Hagmaier, Dirk
     Analysis of the Required Force-Modelling for
     NAVSTAR/GPS Satellites



Although the availability of the Precise Positioning Service (PPS) of the Global Positioning System (GPS) in the future is still uncertain it seems to revolutionize geodesy and to replace classical surveying techniques even by only using the various other capabilities (Standard Positioning Service - SPS).

The Institute of Astronomical and Physical Geodesy (IAPG) of the University of the Federal Armed Forces Munich decided therefore mid of 1984 to concentrate its satellite research on the topic of GPS. The present report summarizes the investigations and achievements in 1985 in the form of seven papers.

Starting with basic physics and mathematics behind the analysis of GPS data the work covers aspects of GPS satellite selection in the field work, the incorporation of GPS baseline vectors in network adjustments with special emphasis of the determination of orthometric heights by combination with gravity data, and a description of one of the GPS analysis software products of IAPG, the phase-difference processing program. Finally, the required force-modelling for the orbit determination of GPS satellites is outlined, as it is used in our program system. Most of the theory written in the papers is accompanied by test computations.

The decision to publish the above mentioned papers in the green series of the University FAF Munich was mainly influenced by the fact, that knowledge and state-of-the-art in GPS research change very fast, and quick publication is therefore recommended in order to avoid duplication of work. Thus, it can happen, that described software is an "old hat" in one or two years. Nevertheless, let us hope, that some of the results reported here may be a small step towards the full use of the capability of GPS in geodesy and surveying, mainly in Germany.

We are indebted to Mrs. Grandl, Mrs. Grimm and Mrs. Zech for the patient and careful typing of the papers. We further acknowledge the Hessian Department of Surveys (Hessisches Landesvermessungsamt) in Wiesbaden, especially Dr.-Ing. Strauß, for making Macrometer field data available to us. Thanks also to the U.S. National Geodetic Survey, Rockville, Md., for providing data, and for assistance during the development of our own programs.

We further acknowledge the efforts of Miss Eggert who managed the editorial work.

Neubiberg, March 1986

Günter W. Hein

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