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Characterization of Tropical Rainforest for X-Band Spaceborne SAR Calibration Using TanDEM-X Data

Dell Amore, Luca and Bueso Bello, Jose Luis and Klenk, Patrick and Reimann, Jens and Rizzoli, Paola (2023) Characterization of Tropical Rainforest for X-Band Spaceborne SAR Calibration Using TanDEM-X Data. IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2023-07-16 - 2023-07-21, Pasadena, USA.

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The radiometric calibration of spaceborne SAR products plays a key role for assuring a good performance of the whole end-to-end system and requires a precise knowledge of both the radar system and the illuminated target. For example, the shape of the antenna pattern in elevation can be directly estimated by analysing SAR detected images in presence of a homogeneous backscatter profile in the slant range dimension. To this aim, tropical rainforests have been established by the SAR community as well-known calibration sites for performing such an activity. Here, according to the hypothesis of isotropic scattering, the backscattering coefficient in terms of unit area perpendicular to the antenna, called gamma nought, is assumed to remain constant with respect to the incidence angle. Nevertheless, several studies using X- and C-band sensors have shown a slight dependency of the backscatter on the incidence angle, as well as on ground target properties and meteorological conditions. In this work, we present a detailed statistical characterization of radar backscatter at X-band over the Amazon rainforest using TanDEM-X high-resolution data, and we provide insights on how to best utilize radar backscatter data in this region for SAR calibration and modelling purposes. In particular, we concentrate on the dependence of the Amazon rainforest backscatter on the day-time of acquisition, which is directly related to the orbit direction of TanDEM-X. Furthermore, we analyse the seasonal variation of the radar backscatter, as well as possible variations with respect to different latitudes, characterized by different climate conditions and biomes. Finally, we provide a series of backscatter models for different scenarios, which can be used, e.g., for X-band spaceborne SAR system design and theoretical modelling.

Item URL in elib:https://elib.dlr.de/194844/
Document Type:Conference or Workshop Item (Speech)
Title:Characterization of Tropical Rainforest for X-Band Spaceborne SAR Calibration Using TanDEM-X Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dell Amore, LucaUNSPECIFIEDhttps://orcid.org/0000-0002-6731-1300146516645
Bueso Bello, Jose LuisUNSPECIFIEDhttps://orcid.org/0000-0003-3464-2186UNSPECIFIED
Klenk, PatrickUNSPECIFIEDhttps://orcid.org/0000-0002-8284-2265UNSPECIFIED
Reimann, JensUNSPECIFIEDhttps://orcid.org/0000-0002-0650-9073UNSPECIFIED
Rizzoli, PaolaUNSPECIFIEDhttps://orcid.org/0000-0001-9118-2732UNSPECIFIED
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Synthetic Aperture Radar (SAR), SAR Calibration, Amazon Rainforest, TanDEM-X
Event Title:IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
Event Location:Pasadena, USA
Event Type:international Conference
Event Dates:2023-07-16 - 2023-07-21
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - AI4SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Dell Amore, Luca
Deposited On:02 May 2023 10:44
Last Modified:13 Nov 2023 12:19

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