SPS Webinar: Pol-InISAR Approach for 3D Imaging of Non-Cooperative Targets

Date: 8 May 2024
Time: 9:00 AM ET (New York Time)
Presenter(s): Dr. Ajeet Kumar

Original article: Download Open Access article


This webinar presentation will describe a Polarimetric Interferometry Inverse Synthetic Aperture Radar (Pol-InISAR)-based novel 3D imaging approach for detecting complex non-cooperative military targets in their true 3D form. 3D imaging overcomes the limitations of 2D imaging methods related to the unknown IPP (image projection plane) and the requirement of cross-range scaling. 3D imaging of non-cooperative targets becomes possible by combining additional information of interferometric phase along with conventional 2D ISAR imaging. In the previously reported single-polarimetry InISAR-based 3D imaging, only a single-channel interferometric phase is available, which can be exploited to reconstruct the 3D ISAR image. This limits the ability to obtain the full target's scattering response and, therefore, limits the estimation of an accurate interferometric phase. To overcome this constraint, full-polarimetry ISAR information is exploited, allowing the selection of the optimal polarimetric combination that provides the highest coherence. Higher coherence leads to a reduction, optimally a minimization, of the phase estimation error. Consequently, with optimal phase estimation, accurate 3D imaging of the target is possible. To validate this proposed Pol-InISAR-based 3D imaging approach, both simulated and real datasets are taken into consideration.


Ajeet Kumar (Member, IEEE) received the Ph.D. degree in RF and microwave engineering from the Department of Electronics and Communication Engineering, Indian Institute of Technology Roorkee, Roorkee, India, in October 2019.

He currently holds a permanent full-time Researcher (Researcher Level IV) position with the CNIT – National Laboratory of Radar and Surveillance Systems (RaSS), Pisa, Italy and has more than ten years of experience working with real satellite datasets for earth and planetary observations. From 2014 to 2017, he worked with the Indian Space Research Organization's (ISRO) mission of Radar Imaging Satellites (RISAT-1), which was the first earth observatory satellite in the world to produce hybrid-polarimetry SAR datasets. He was also involved in another ISRO space-borne mission of Chandrayaan-2 (CH-2), where he established a highly accurate dielectric estimation model for the lunar regolith. Since 2021, he has been working on the Office of Naval Research Global (ONR Global) sponsored project of ATR by means of Polarimetric ISAR Images and multi-view 3D InISAR. His research interests include Polarimetric SAR (PolSAR), Hybrid-Polarimetry SAR (Hybrid-pol SAR), Interferometry SAR (InSAR), and Inverse SAR (ISAR) based radar applications.

Dr. Kumar has published more than fifteen SCI journal papers and various reputed conferences. He serves as a reviewer for many reputed IEEE, IET, Elsevier, Taylor & Francis, and MDPI journals. He has recently been elevated to senior grade member of the International Union of Radio Science for his vital contribution as a radio scientist. He received the esteemed Young Scientist Award (YSA) from URSI in 2022.