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.
Highlights
The TerraSAR-X satellite mission [1,2] consists of the two spacecrafts: TSX and TDX, which are equipped with Synthetic Aperture Radar (SAR) instruments for active remote sensing
In 2012, the series exhibits a data gap in January, which is caused by a planned outage of Satellite Laser Ranging (SLR) tracking due to a spacecraft campaign
SAR and SLR are two active techniques, which allow measuring the distance to a point target, known as a Laser Retro Reflector (LRR) onboard the satellite in case of laser, or Corner Reflectors (CRs) on ground in case of radar observations
Summary
The TerraSAR-X satellite mission [1,2] consists of the two spacecrafts: TSX and TDX, which are equipped with Synthetic Aperture Radar (SAR) instruments for active remote sensing. Data obtained from various laser ranging stations for TSX and TDX, and the notably high ranking of the mission in the tracking priority list provide highly reliable SLR data. The derived SAR and SLR measurements are compared in terms of residuals, and estimated spacecraft position offsets. SLR allows estimation of the offsets in radial, along-, and cross-track direction, which is comparable to the range and azimuth residuals, obtained from the SAR analysis.
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