Precise Three-Dimensional Stereo Localization of Corner Reflectors and Persistent Scatterers With TerraSAR-X

Gisinger, Christoph; Balss, Ulrich; Pail, Roland; Zhu, Xiao Xiang; Montazeri, Sina; Gernhardt, Stefan; Eineder, Michael

doi:10.1109/tgrs.2014.2348859

Cited by 78 publications

(104 citation statements)

References 28 publications

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“…Eldhuset and Weydahl (2011) found a residual Doppler (equivalent to the azimuth offset), which was of the same order as the azimuth residual found in Gisinger et al (2015) in Figure 8 b for the TMSP v4.4 processor. The updated TMSP v4.5 and v4.6 were found to be more accurate.…”

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confidence: 56%

Combination of stereo SAR and InSAR for DEM generation using TanDEM-X spotlight data

Eldhuset

2017

International Journal of Remote Sensing

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The objective of this work is to generate accurate digital elevation models (DEMs) from synthetic aperture radar (SAR) interferograms using the spotlight and staring spotlight modes during the TanDEM-X (TDX) science phase. We use stereo SAR with TDX or TerraSAR-X (TSX) to estimate absolute heights of natural or manmade reflectors for input to the unwrapped interferograms. The accuracy of the absolute heights in the DEMs was a few decimetres in flat regions and a few metres in the hilly and rugged terrain. ARTICLE HISTORY

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confidence: 56%

Combination of stereo SAR and InSAR for DEM generation using TanDEM-X spotlight data

Eldhuset

2017

International Journal of Remote Sensing

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“…The remaining azimuth bias (mean azimuth ALE) of ~1.8 m for both types of SM products may possibly be influenced by a combination of (a) instrument timing mismatches (small difference between GPS and SAR instrument time); (b) orbital state vector estimation in ITRF; (c) orbital state vector interpolation accuracy; (d) satellite center of mass vs. SAR antenna phase center position; (e) uncertainties inherent in the azimuth time stamp annotations caused by quantization of the clock rate (e.g., for TerraSAR-X this effect contributes up to 6.5 cm azimuth error [21]); or (f) a bias in the relativistic Doppler correction for along-track motion. These potential influences may be subject to future studies in order to even further improve the already remarkable S1A geolocation accuracy.…”

Section: Discussionmentioning

confidence: 99%

Sentinel-1A Product Geolocation Accuracy: Commissioning Phase Results

et al. 2015

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Sentinel-1A (S1A) is an Earth observation satellite carrying a state-of-the-art Synthetic Aperture Radar (SAR) imaging instrument. It was launched by the European Space Agency (ESA) on 3 April 2014. With the end of the in-orbit commissioning phase having been completed at the end of September 2014, S1A data products are already consistently providing highly accurate geolocation. StripMap (SM) mode products were acquired regularly and tested for geolocation accuracy and consistency during dedicated corner reflector (CR) campaigns. At the completion of this phase, small geometric inconsistencies had been understood and mitigated, with the high quality of the final product geolocation estimates reflecting the mission's success thus far. This paper describes the measurement campaign, the methods used during geolocation estimation, and presents best estimates of the product Absolute Location Error (ALE) available at the beginning of S1A's operational phase.

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“…Expanding this concept to a more general method by employing least-squares parameter estimation, any number of radar images larger than one may be combined in a consistent estimation of the target position. This general approach is the core of our Stereo SAR method which is extensively discussed in [12]. In the following, we provide only a short summary and the reader interested in more details is referred to the paper.…”

Section: Sar Positioning With Stereo Sarmentioning

confidence: 99%

“…X s is provided with the SAR image annotation and it is kept fixed in the processing. The orbit is modelled through short arc polynomials [12], but the along-track relationship of the azimuth observation with the orbital state vector is fully maintained through the linearization. We do not introduce any a priori variance information for the individual measurements, but variance component estimation [14] is part of the solution process to infer a common variance for all the range Remote Sens.…”

Section: Sar Positioning With Stereo Sarmentioning

confidence: 99%

Measurements on the Absolute 2-D and 3-D Localization Accuracy of TerraSAR-X

Balss¹,

Gisinger²,

Eineder³

2018

Remote Sensing

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Abstract:The German TerraSAR-X radar satellites TSX-1 and TDX-1 are well-regarded for their unprecedented geolocation accuracy. However, to access their full potential, Synthetic Aperture Radar (SAR)-based location measurements have to be carefully corrected for effects that are well-known in the area of geodesy but were previously often neglected in the area of SAR, such as wave propagation and Earth dynamics. Our measurements indicate that in this way, when SAR is handled as a geodetic measurement instrument, absolute localization accuracy at better than centimeter level with respect to a given geodetic reference frame is obtained in 2-D and, when using stereo SAR techniques, also in 3-D. The TerraSAR-X measurement results presented in this study are based on a network of three globally distributed geodetic observatories. Each is equipped with one or two trihedral corner reflectors with accurately (<5 mm) known reference coordinates, used as a reference for the verification of the SAR measured coordinates. Because these observatories are located in distant parts of the world, they give us evidence on the worldwide reproducibility of the obtained results. In this paper we report the achieved results of measurements performed over 6 1/2 years (from July 2011 to January 2018) and refer to some first new application areas for geodetic SAR.

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Precise Three-Dimensional Stereo Localization of Corner Reflectors and Persistent Scatterers With TerraSAR-X

Cited by 78 publications

References 28 publications

Combination of stereo SAR and InSAR for DEM generation using TanDEM-X spotlight data

Combination of stereo SAR and InSAR for DEM generation using TanDEM-X spotlight data

Sentinel-1A Product Geolocation Accuracy: Commissioning Phase Results

Measurements on the Absolute 2-D and 3-D Localization Accuracy of TerraSAR-X

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