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

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Názov: Motion Parameter Estimation of Doppler-Ambiguous Moving Targets in SAR-GMTI
Autori: Gabele, Martina, Sikaneta, Ishuwa
Prispievatelia: Rohling, Hermann
Informácie o vydavateľovi: IEEE, 2007.
Rok vydania: 2007
Predmety: wavenumber domain algorithm, chirp scaling algorithm, range cell migration correction, 0211 other engineering and technologies, 0202 electrical engineering, electronic engineering, information engineering, Moving target motion parameter estimation, Doppler-ambiguities, ATI, 02 engineering and technology, Satelliten-SAR-Systeme, Institut für Hochfrequenztechnik und Radarsysteme
Popis: 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.
Druh dokumentu: Conference object
Popis súboru: application/pdf
Jazyk: English
Prístupová URL adresa: https://elib.dlr.de/48729/
Prístupové číslo: edsair.od......1640..4a560ec8dfd4f0b4b3a13554a193b80c
Databáza: OpenAIRE
Popis
Abstrakt: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.