Inter-agency comparison of TanDEM-X baseline solutions

摘要: Abstract TanDEM-X (TerraSAR-X add-on for Digital Elevation Measurement) is the first Synthetic Aperture Radar (SAR) mission using close formation flying bistatic SAR interferometry. The primary goal of to generate a global digital elevation model (DEM) with 2 m height precision and 10 m ground resolution from configurable interferometer space baselines few hundred meters. As key requirement interferometric processing, relative position, or baseline vector, two satellites must be determined an accuracy 1 mm (1D RMS) GPS measurements collected by onboard receivers. operational products are routinely generated German Research Center Geosciences (GFZ) Space Operations (DLR/GSOC) different software packages (EPOS/BSW, GHOST) analysis strategies. For further independent performance assessment, solutions at Astronomical Institute University Bern (AIUB) on best effort basis Bernese Software (BSW). Dual-frequency compared 1-month test period in January 2011. Differences reduced-dynamic exhibit representative standard deviation (STD) outside maneuver periods, while biases below all directions. achieved determination specification, but calibration data takes acquired over areas well known DEM previous missions will required fully meet 1D RMS target. Besides solutions, single-frequency tested. They benefit more robust ambiguity fixing show slightly better agreement STD, potentially affected errors caused incomplete compensation differential ionospheric path delays.