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

1
German Space Operations Center, Deutsches Zentrum für Luft- und Raumfahrt, 82230 Wessling, Germany
2
Remote Sensing Technology Institute, Deutsches Zentrum für Luft- und Raumfahrt, 82230 Wessling, Germany
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(5), 762; https://doi.org/10.3390/rs10050762
Received: 18 April 2018 / Revised: 9 May 2018 / Accepted: 13 May 2018 / Published: 15 May 2018
(This article belongs to the Special Issue Ten Years of TerraSAR-X—Scientific Results)
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Abstract

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 σ ) 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. View Full-Text
Keywords: TerraSAR-X; TanDEM-X; LEO; POD; SLR; SAR; Satellite Laser Ranging; radar ranging; satellite orbit; validation TerraSAR-X; TanDEM-X; LEO; POD; SLR; SAR; Satellite Laser Ranging; radar ranging; satellite orbit; validation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hackel, S.; Gisinger, C.; Balss, U.; Wermuth, M.; Montenbruck, O. Long-Term Validation of TerraSAR-X and TanDEM-X Orbit Solutions with Laser and Radar Measurements. Remote Sens. 2018, 10, 762.

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