IEEE Transactions on Geoscience and Remote Sensing · 2001 · 69 citations · 10 references
Natural SciencesEarth SciencesGeoinformaticsGeodesyGlobal Navigation Satellite SystemsRemote SensingGeodetic SurveyingRadar CalibrationSatellite Data CalibrationSatellite InstrumentationSatellite OrbitsSatellite SensorsCorner ReflectorsGeodetic Data ProcessingGeometric CalibrationGeometric Parameter CalibrationLong-term Orbital StabilityLong-term StabilityRemote Sensing InstrumentationSynthetic Aperture Radar
Geometric calibration of ERS satellite SAR slant‑range images is essential for mapping areas lacking ground reference points and for automated processing. The study describes a descending‑and‑ascending orbit tandem pair at the ESA calibration site on Flevoland to enable researchers to geometrically calibrate their ERS SAR processors. SAR system parameters were calibrated using ESA transponders at Flevoland, verified with runway intersections and corner reflectors surveyed by differential GPS, and the tandem orbit pair was detailed for external use. The calibrated images achieve 10 m horizontal accuracy, and long‑term stability over seven‑year ERS‑1 and four‑year ERS‑2 series confirms a single calibration can cover the entire mission.
Geometric calibration of the European Remote Sensing (ERS) Satellite synthetic aperture radar (SAR) slant range images is important in relation to mapping areas without ground reference points and also in relation to automated processing. The relevant SAR system parameters are discussed and calibrated by using the European Space Agency (ESA) transponders at Flevoland. The resulting accuracy of the slant range images corresponds to 10 m horizontally on the ground. The results are verified by using runway intersections and corner reflectors surveyed with differential GPS techniques. Based on a seven-year ERS-1 and a four-year ERS-2 time series, the long term stability is found to be sufficient to allow a single calibration covering the entire mission period. A descending and an ascending orbit tandem pair of the ESA calibration site on Flevoland, suitable for calibration of ERS SAR processors, is described to allow other researchers to geometrically calibrate their processing systems.
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