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A Waveform-Encoded SAR Implementation Using a Limited Number of Cyclically Shifted Chirps

Jeon, Se-Yeon and Glatz, Fabian and Villano, Michelangelo (2021) A Waveform-Encoded SAR Implementation Using a Limited Number of Cyclically Shifted Chirps. Remote Sensing, 13 (15), pp. 1-14. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs13153038. ISSN 2072-4292.

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Official URL: https://www.mdpi.com/2072-4292/13/15/3038


Synthetic aperture radar (SAR) provides high-resolution images of the Earth’s surfaceirrespective of sunlight and weather conditions. In conventional spaceborne SAR, nadir echoescaused by the pulsed operation of SAR may significantly affect the SAR image quality. Therefore,the pulse repetition frequency (PRF) is constrained within the SAR system design to avoid theappearance of nadir echoes in the SAR image. As an alternative, the waveform-encoded SAR conceptusing a pulse-to-pulse variation of the transmitted waveform and dual-focus postprocessing canbe exploited for nadir echo removal and to alleviate the PRF constraints. In particular, cyclicallyshifted chirps have been proposed as a possible waveform variation scheme. However, a largenumber of distinct waveforms is required to enable the simple implementation of the concept.This work proposes a technique based on the Eulerian circuit for generating a waveform sequencestarting from a reduced number of distinct cyclically shifted chirps that can be effectively exploitedfor waveform-encoded SAR. The nadir echo suppression performance of the proposed scheme isanalyzed through simulations using real TerraSAR-X data and a realistic nadir echo model thatshows how the number of distinct waveforms and therefore the system complexity can be reducedwithout significant performance loss. These developments reduce the calibration burden and makethe concept viable for implementation in future SAR systems.

Item URL in elib:https://elib.dlr.de/143402/
Document Type:Article
Title:A Waveform-Encoded SAR Implementation Using a Limited Number of Cyclically Shifted Chirps
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Villano, MichelangeloUNSPECIFIEDhttps://orcid.org/0000-0002-1769-6927UNSPECIFIED
Date:2 August 2021
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-14
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Keywords:Cyclically shifted chirps; Eulerian circuit; matched filtering; nadir echo; pulse repetition frequency (PRF); synthetic aperture radar (SAR); waveform diversity.
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
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Villano, Dr.-Ing. Michelangelo
Deposited On:03 Aug 2021 09:17
Last Modified:18 Feb 2022 11:30

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