der Universität der Bundeswehr München
GPS Research 1985 at the Institute of Astronomical and Physical Geodesy
Editors: H. Landau, B. Eissfeller and G. W. Hein
Universität der Bundeswehr München, Neubiberg, 1986
Hein, G. W., Eissfeller, B.:
Landau, H., Eissfeller, B.:
Landau, H., Hagmaier, D.:
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 anlysis 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 programme. 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 dcision 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 use. 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.