RADARSAT-2 system operations and performance

Chabot, M.; Decoust, C.; Lambert, Casey; Rolland, P.A.; Ledantec, P.; Williams, D.

doi:10.1109/igarss.2015.7326067

Cited by 2 publications

(4 citation statements)

References 1 publication

(2 reference statements)

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“…A disadvantage is that to enable a large RCS signal, it is necessary to use large CRs, especially at lower SAR frequencies, such as L-band. The peak theoretical RCS (that occurs along the boresight vector) σ peak of triangular trihedral CRs depends on the wavelength λ and the size of the reflector, given by the inner side length (inner leg dimension) a [20] σ triangle,peak = 4πa 4 3λ 2 .…”

Section: A Corner Reflector Installationsmentioning

confidence: 99%

“…For the SAR analysis of the Australian CR array, we benefit from several Australian GNSS receivers contributing to the global IGS network. 2 Because of these stations, the expected uncertainty of the ionospheric path delay correction derived for the SAR observations is in the order of 1-2 cm. The values apply for the Sentinel-1 C-band frequency of 5.405 GHz, which experiences a stronger delay by the dispersive ionosphere than the 9.65-GHz X-band frequency used by TerraSAR-X.…”

Section: B Sar Geolocation Analysis Proceduresmentioning

confidence: 99%

“…They typically aim for an ALE of half the pixel spacing to ensure accurate geolocation of the SAR scenes for direct comparison with other geospatial data sets. For Sentinel-1, RADARSAT-2, TerraSAR-X, and COSMO-SkyMed, this translates into official requirements for the guaranteed geolocation ranging from 1 m up to a few meters [2]- [6].…”

Section: Introductionmentioning

confidence: 99%

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In-Depth Verification of Sentinel-1 and TerraSAR-X Geolocation Accuracy Using the Australian Corner Reflector Array

Gisinger

Schubert

Breit

et al. 2021

IEEE Trans. Geosci. Remote Sensing

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This article shows how the array of corner reflectors (CRs) in Queensland, Australia, together with highly accurate geodetic synthetic aperture radar (SAR) techniques-also called imaging geodesy-can be used to measure the absolute and relative geometric fidelity of SAR missions. We describe, in detail, the end-to-end methodology and apply it to TerraSAR-X Stripmap (SM) and ScanSAR (SC) data and to Sentinel-1 interferometric wide swath (IW) data. Geometric distortions within images that are caused by commonly used SAR processor approximations are explained, and we show how to correct them during postprocessing. Our results, supported by the analysis of 140 images across the different SAR modes and using the 40 reflectors of the array, confirm our methodology and achieve the limits predicted by theory for both Sentinel-1 and TerraSAR-X. After our corrections, the Sentinel-1 residual errors are 6 cm in range and 26 cm in azimuth, including all error sources. The findings are confirmed by the mutual independent processing carried out at University of Zurich (UZH) and German Aerospace Center (DLR). This represents an improvement of the geolocation accuracy by approximately a factor of four in range and a factor of two in azimuth compared with the standard Sentinel-1 products. The TerraSAR-X results are even better. The achieved geolocation accuracy now approaches that of the global navigation satellite system (GNSS)-based survey of the CRs positions, which highlights the potential of the end-to-end SAR methodology for imaging geodesy.

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Section: A Corner Reflector Installationsmentioning

confidence: 99%

Section: B Sar Geolocation Analysis Proceduresmentioning

confidence: 99%

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In-Depth Verification of Sentinel-1 and TerraSAR-X Geolocation Accuracy Using the Australian Corner Reflector Array

Gisinger

Schubert

Breit

et al. 2021

IEEE Trans. Geosci. Remote Sensing

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“…Gaofen-3, the first C-band multipolarization synthetic aperture radar (SAR) satellite from China, was launched in August 2016 with a maximum resolution of 1 m 1 . It possesses many similarities with the Canadian Radarsat-2 regarding imaging and polarization modes 2 Table 1. lists the 12 imaging modes of Gaofen-3.…”

Section: Introductionmentioning

confidence: 99%

Multimode Gaofen-3 product long-term geolocation accuracy performance

Deng

Wang

Liu

et al. 2022

J. Appl. Rem. Sens.

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.Gaofen-3, the first high-resolution C-band multipolarization synthetic aperture radar satellite from China, has been in orbit for 5 years. It is significant for evaluating the positioning accuracy of Gaofen-3 products and determining the possibility of improvement. In this study, 338 Gaofen-3 images for six imaging modes from 16 test fields in China were selected, and 363 ground control points were used as independent checkpoints to verify positioning accuracy. The test results show that the average positioning accuracy of the six modes in the slant range direction was between −27.52 and −17.32 m. The average positioning accuracy of the six modes in the azimuth direction was between −17.21 and 2.4 m. The comparative experiments under the same imaging conditions demonstrate that the on-orbit state of Gaofen-3 is relatively stable. The internal electronic delay of the instrument and the azimuth “bistatic error” of the Gaofen-3 image rational function location model have not been eliminated. There is room for further improvement in the positioning accuracy of the Gaofen-3 standard product.

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RADARSAT-2 system operations and performance

Cited by 2 publications

References 1 publication

In-Depth Verification of Sentinel-1 and TerraSAR-X Geolocation Accuracy Using the Australian Corner Reflector Array

In-Depth Verification of Sentinel-1 and TerraSAR-X Geolocation Accuracy Using the Australian Corner Reflector Array

Multimode Gaofen-3 product long-term geolocation accuracy performance

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