Description: Das Projekt "High-resolution geodetic Earth observation (DLR Uni)" wird/wurde gefördert durch: Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt GmbH. Es wird/wurde ausgeführt durch: Technische Universität München, Institut für Astronomische und Physikalische Geodäsie.Combination of geometric (GNSS, altimetry, SAR) and gravimetric (GRACE, GOCE, terrestrial) information for detection of deformation and mass change signals. Geometric (GNSS, Altimetrie, SAR) and gravimetric (GRACE, GOCE, terrestrial) techniques deliver complimentary information on changes of system Earth at different temporal and spatial scales. Their consistent combination is the main objective of this project, which is performed in the frame of Munich Aerospace. The project comprises 3 main topics: (1) development of geodetic correction methods for SAR processing and validation; (2) establishing of a test network; (3) joint geometric and gravimetric modelling on various scales. The primary usage of space borne SAR (Synthetic Aperture Radar) is imaging, which is independent of the actual weather conditions, and precise detection of relative motions by analysing the phase measurements (SAR interferometry). By applying image correlation techniques, SAR can also be used as an absolute measurement technique. Concerning topic (1), the aim is the absolute pixel localisation, whose accuracy for TerraSAR-X shall be increased to the phase accuracy (centimetre to millimetre) by applying all geometrical, physical and geodetic corrections. Since at these accuracy levels the same distortions become relevant as with GNSS positioning (troposphere, ionosphere, tides, continental drift, etc.), the data used for the corrections shall be derived analogously to GNSS processing. Concerning task (2), the Wettzell experiment includes a corner cube reflector (side lengths 1.5 m), periodic radar records from TerraSAR-X (11 days period) and several GNSS receivers, with which the corrections are derived. The reference coordinates of the reflector have been derived by geodetic terrestrial surveying, which in this case are accurate to the millimetre range. By comparing the reference coordinates with the corrected measurements, the quality of the different corrections can be analysed systematically. Among other issues the influence of the ionosphere has to be considered with its strong spatial and temporal variations. The current analyses show, that TerraSAR-X is able to reach accuracy for geo location of a few centimetres.
SupportProgram
Origins: /Bund/UBA/UFORDAT
Tags: München ? Radar ? Pestizidabdrift ? Messtechnik ? Struktur-Wirkung-Beziehung ? Geoinformation ? Erdbeobachtung ? Daten ? Geodäsie ? Ionosphäre ? Systemtechnik ? Technik ? Troposphäre ? Modellierung ? Messung ? REACH ? Gezeiten ? Änderung ? VERGLEICHEN ? EXPERIMENT ? MISCHUNG ? Massenänderung ? NUTZUNG ? Netz ? Ortsbestimmung ? PIXEL ? RATIFIKATION ? REFERENZ ? SAR [Radar] ? SAR-Wert (Strahlenschutz) ? STANDORT ? STARK ? STELLE ? VERARBEITUNG ? DAUER ? Vermehrung ? WAND ? ZEITRAEUME ?
Region: Bayern
Bounding boxes: 12.53381° .. 12.53381° x 47.795° .. 47.795°
License: cc-by-nc-nd/4.0
Language: Englisch/English
Time ranges: 2011-10-01 - 2016-09-30
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