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Motion Parameter Estimation of Doppler-Ambiguous Moving Targets in SAR-GMTI

Gabele, Martina and Sikaneta, Ishuwa (2007) Motion Parameter Estimation of Doppler-Ambiguous Moving Targets in SAR-GMTI. In: International Radar Symposium (IRS). IEEE. International Radar Symposium (IRS), 2007-09-05 - 2007-09-07, Köln, Germany.

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Abstract

In an along-track interferometric SAR system, the discrete sampling of moving target signals can give rise to two types of ambiguity: Doppler ambiguity, and interferometric angle ambiguity. These ambiguities lead to ambiguities in target velocity estimation. Range cell migration of moving targets is unambiguous in target velocity. Hence, it can be used for resolving the ambiguities in target velocity estimation mentioned above. The wave number domain algorithm as well as the chirp scaling algorithm is adapted to moving target signals. In order to focus moving target signals with arbitrary velocities both approaches are extended to arbitrary Doppler frequency ands. Moving target signals distributed over two neighbouring PRF bands are especially difficult to detect and analyze because the sgnal splits into two parts. It is shown that the two parts appear at different positions in the SAR image and have different ATI phases. They show up as two weaker targets since the energy is split between them. It is demonstrated how the two targets can be identified as possibly the same target, and how they can be properly focussed by adaptation of the SAR focussing algorithms.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Motion Parameter Estimation of Doppler-Ambiguous Moving Targets in SAR-GMTI
Authors:
AuthorsInstitution or Email of Authors
Gabele, MartinaUNSPECIFIED
Sikaneta, IshuwaDRDC
Date:31 July 2007
Journal or Publication Title:International Radar Symposium (IRS)
Refereed publication:No
In ISI Web of Science:No
Editors:
EditorsEmail
Rohling, HermannUNSPECIFIED
Publisher:IEEE
Status:Published
Keywords:Moving target motion parameter estimation, ATI, Doppler-ambiguities, range cell migration correction, wavenumber domain algorithm, chirp scaling algorithm
Event Title:International Radar Symposium (IRS)
Event Location:Köln, Germany
Event Type:international Conference
Event Dates:2007-09-05 - 2007-09-07
Organizer:German Institute of Navigation (DGON) and Technical University Hamburg-Harburg
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - ARGOS (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Martina Gabele
Deposited On:07 Oct 2008
Last Modified:12 Dec 2013 20:24

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