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Characterization of Nadir Echoes in Multiple Elevation-Beam SAR with Constant and Variable Pulse Repetition Interval

Villano, Michelangelo and Nogueira Peixoto, Maxwell (2021) Characterization of Nadir Echoes in Multiple Elevation-Beam SAR with Constant and Variable Pulse Repetition Interval. IEEE Transactions on Geoscience and Remote Sensing. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2021.3103266. ISSN 0196-2892.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://ieeexplore.ieee.org/document/9515360


Multiple-elevation-beam synthetic aperture radar (SAR) is a concept based on digital beamforming (DBF) in elevation and simultaneous recording of the echoes of multiple transmitted pulses. It enables high-resolution imaging of wide areas and is therefore ideal for the systematic observation of dynamic processes on the Earth’s surface. Furthermore, if the pulse repetition interval (PRI) is continuously varied (staggered SAR), it is possible to map a wide continuous swath rather than multiple subswaths separated by “blind” ranges. Within the design of multiple-elevation-beam SAR, however, it is fundamental to consider how nadir echoes affect the mapping capabilities of systems with constant PRI and the image quality of staggered SAR systems, where nadir echoes are intrinsically smeared due to the PRI variation. This paper addresses the characterization of nadir echoes in multiple-elevation-beam SAR with constant and variable PRI by presenting a parametric model for the nadir echo profile based on real radar measurements, a formulation of the nadir echo location and smearing in staggered SAR, and realistic simulations based on TerraSAR-X data, which show that nadir echo are likely to be barely visible in staggered SAR images. The results of this work are relevant to both the design of future SAR systems and the interpretation of the acquired data.

Item URL in elib:https://elib.dlr.de/143415/
Document Type:Article
Title:Characterization of Nadir Echoes in Multiple Elevation-Beam SAR with Constant and Variable Pulse Repetition Interval
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Villano, MichelangeloUNSPECIFIEDhttps://orcid.org/0000-0002-1769-6927UNSPECIFIED
Date:17 August 2021
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Digital beamforming, high-resolution wide-swath (HRWS) imaging, multiple-elevation-beam SAR, nadir echo, NASA-ISRO SAR (NISAR), staggered SAR, synthetic aperture radar (SAR), Tandem-L.
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 - SAR missions
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Villano, Dr.-Ing. Michelangelo
Deposited On:05 Aug 2021 13:50
Last Modified:18 Feb 2022 11:30

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