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Acknowledgments ACKNOWLEDGMENTS I would like to express my sincere gratitude to my supervisor, Pr<strong>of</strong>. Dr.-Ing. Günter W. Hein for his guidance, valuable comments and improvement. Without his support, I cannot finish this work. My many thanks also give to Pr<strong>of</strong>. Dr.-Ing. Bernd Eissffeller and Pr<strong>of</strong>. Dr.-Ing. Erwin Groten for their comments and suggestions. The help and valuable information from Dr. John M. Dow, European Space Operation Center (ESOC) at Darmstadt, Germany; Dr. Eberhard Gill, Germany Space Operation Center (GSOC) at Wessling, Germany; Dr. TS Kelso, US Air Force Institute <strong>of</strong> Technology (AFIT) at Wright-Patterson AFB in Ohio, USA; Dr. Dirk Oscam, Astrium GmbH at Fridrichhafen, Germany; Dr. Herbert Landau, Mr. Daniel Grossmith and Ms. Monika Jennert, Trimble TerraSat GmbH at Höhenkirchen, Germany and Mr. Daniel König, University FAF Munich at Neubiberg, Germany are also great appreciated. The Education Ministry <strong>of</strong> Chinese government which supports my stay in Germany as visiting scholar from January 1996 to December 1996 is also acknowledged. 151