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Evaluating interferometric baseline performances in a close formation flight by using relative GRACE GPS navigation solutions

Kohlhase, Andreas and Kroes, Remko and D'Amico, Simone (2006) Evaluating interferometric baseline performances in a close formation flight by using relative GRACE GPS navigation solutions. In: 19th International Symposium on Space Flight Dynamics. 19th International Symposium on Space Flight Dynamics, 2006-04-06 - 2006-11-06, Kanazawa, Japan.

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Abstract

In this paper the impact of relative position errors on the interferometric baseline performance of multistatic Synthetic Aperture Radar (SAR) satellites flying in a close formation is analyzed and assessed. Based on accuracy results obtained from differential GPS (DGPS) observations between the twin Gravity Recovery and Climate Experiment (GRACE) satellites, baseline uncertainties are derived for three interferometric scenarios of a dedicated SAR mission. To assess the accuracy with respect to quality requirements of high-resolution DEMs, topographic height errors are derived from the estimated baseline uncertainties. The analysis reveals that the induced low-frequencymodulation (height bias) fulfills the relative vertical accuracy requirement (std. dev. less than 1 m linear point-to-point error) of a Digital Terrain Elevation Data model of level 3 (DTED-3) for most of the baseline constellations. DGPS can be used as an operational navigation tool for high-precise baseline estimation if a geodetic-grade dual-frequency spaceborne GPS receiver is assumed to be the primary instrument onboard the SAR satellites. To exemplarily demonstrate the error propagation into the inteferogram Orbital Phase Screens (OPS) are generated by differencing simulated interferograms. These are calculated from baselines of distinct GRACE error signatures and magnitudes.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Evaluating interferometric baseline performances in a close formation flight by using relative GRACE GPS navigation solutions
Authors:
AuthorsInstitution or Email of Authors
Kohlhase, AndreasUNSPECIFIED
Kroes, RemkoUNSPECIFIED
D'Amico, SimoneUNSPECIFIED
Date:June 2006
Journal or Publication Title:19th International Symposium on Space Flight Dynamics
Status:Published
Keywords:SAR interferometry, formation flying, baseline performance, DGPS, GRACE
Event Title:19th International Symposium on Space Flight Dynamics
Event Location:Kanazawa, Japan
Event Type:international Conference
Event Dates:2006-04-06 - 2006-11-06
Organizer:ISTS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Simone D'Amico
Deposited On:23 Jul 2007
Last Modified:12 Dec 2013 20:23

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