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Long-Term Validation of TerraSAR-X and TanDEM-X Orbit Solutions with Laser and Radar Measurements

Hackel, Stefan and Gisinger, Christoph and Balss, Ulrich and Wermuth, Martin and Montenbruck, Oliver (2018) Long-Term Validation of TerraSAR-X and TanDEM-X Orbit Solutions with Laser and Radar Measurements. Remote Sensing, 10 (762), pp. 1-20. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs10050762. ISSN 2072-4292.

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Official URL: http://www.mdpi.com/2072-4292/10/5/762


Precise orbit determination solutions for the two spacecrafts TerraSAR-X (TSX) and TanDEM-X (TDX) are operationally computed at the German Space Operations Center (GSOC/DLR). This publication makes use of 6 years of TSX and TDX orbit solutions for a detailed orbit validation. The validation compares the standard orbit products with newly determined enhanced orbit solutions, which additionally consider GPS ambiguity fixing and utilize a macro model for modeling non-gravitational forces. The technique of satellite laser ranging (SLR) serves as a key measure for validating the derived orbit solutions. In addition, the synthetic aperture radar (SAR) instruments on-board both spacecrafts are for the first time employed for orbit validation. Both the microwave instrument and the optical laser approach are compared and assessed. The average SLR residuals, obtained from the TSX and TDX enhanced orbit solutions within the analysis period, are at 1.6 ± 11.4 mm (1 sigma) and 1.2 ± 12.5 mm, respectively. Compared to the standard orbit products, this is an improvement of 33 % in standard deviation. The corresponding radar range biases are in the same order and amount to -3.5 ± 12.5 mm and 4.5 ± 14.9 mm. Along with the millimeter level position offsets in radial, along-track and cross-track inferred from the SLR data on a monthly basis, the results confirm the advantage of the enhanced orbit solutions over the standard orbit products.

Item URL in elib:https://elib.dlr.de/120050/
Document Type:Article
Additional Information:also reprinted in: Ten Years of TerraSAR-X - Scientific Results, ISBN 978-3-03897-725-4, MDPI 04/2019
Title:Long-Term Validation of TerraSAR-X and TanDEM-X Orbit Solutions with Laser and Radar Measurements
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gisinger, Christophchristoph.gisinger (at) dlr.deUNSPECIFIED
Balss, Ulrichulrich.balss (at) dlr.deUNSPECIFIED
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745X
Date:15 May 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3390/rs10050762
Page Range:pp. 1-20
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:TerraSAR-X; TanDEM-X; LEO; POD; SLR; SAR; Satellite Laser Ranging; radar ranging; satellite orbit; validation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training > Space Flight Technology
Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Hackel, Stefan
Deposited On:22 May 2018 10:38
Last Modified:11 Feb 2021 17:51

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