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Multistatic UAV SAR Joint Synchronization Based on Multiple Direct Wave Pulses Exchange | IEEE Journals & Magazine | IEEE Xplore

Multistatic UAV SAR Joint Synchronization Based on Multiple Direct Wave Pulses Exchange


Abstract:

Multistatic unmanned aerial vehicle synthetic aperture radar (MUAV-SAR) 3-D imaging system suffers from the time and phase synchronization errors among multiple stations....Show More

Abstract:

Multistatic unmanned aerial vehicle synthetic aperture radar (MUAV-SAR) 3-D imaging system suffers from the time and phase synchronization errors among multiple stations. The classical two-way direct wave pulse exchange synchronization method introduces the \pi -ambiguity phase error and causes limited time–phase synchronization accuracy with multiple system nodes, leading to 3-D image defocusing. An MUAV-SAR joint synchronization method based on multiple direct wave pulses exchange is proposed to solve the \pi -ambiguity problem robustly and improve the synchronization accuracy significantly. First, the \pi -ambiguity phase error is estimated through the comparative calculation of delay-phase information extracted from direct wave pulses and the high estimated success probability (99.73%) of the \pi -ambiguity can be achieved through the noise smoothing. Second, the synchronization accuracy is improved, that is, the time and phase errors are reduced to about (2/N)^{1/2} of the existing method by utilizing N stations information fusion to jointly process redundant information of direct wave pulses from multiple synchronization links. Finally, a four-station UAV SAR real data experiment verifies the effectiveness of the proposed approach.
Published in: IEEE Geoscience and Remote Sensing Letters ( Volume: 21)
Article Sequence Number: 4005705
Date of Publication: 26 February 2024

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