GPS-Based Precision Baseline Reconstruction for the TanDEM-X SAR-FormationThe TanDEM-X formation employs two separate spacecraft to collect interferometric Synthetic Aperture Radar (SAR) measurements over baselines of about 1 km. These will allow the generation ofa global Digital Elevation Model (DEM) with an relative vertical accuracy of 2-4 m and a 10 m ground resolution. As part of the ground processing, the separation of the SAR antennas at the time of each data take must be reconstructed with a 1 mm accuracy using measurements from two geodetic grade GPS receivers. The paper discusses the TanDEM-X mission as well as the methods employed for determining the interferometric baseline with utmost precision. Measurements collected during the close fly-by of the two GRACE satellites serve as a reference case to illustrate the processing concept, expected accuracy and quality control strategies.
Montenbruck, O. (Deutsches Zentrum fuer Luft- und Raumfahrt e.V. Wessling, Germany)
vanBarneveld, P. W. L. (Technische Hogeschool Delft, Netherlands)
Yoon, Y. (Deutsches Zentrum fuer Luft- und Raumfahrt e.V. Wessling, Germany)
Visser, P. N. A. M. (Technische Hogeschool Delft, Netherlands)
August 24, 2013
September 24, 2007
Publication: Proceedings of the 20th International Symposium on Space Flight Dynamics