Memorias de investigación
Communications at congresses:
New Technique for Static Target Detection in Dense-Multipath Urban Environments
Year:2011
Research Areas
  • Electronic technology and of the communications
Information
Abstract
Synthetic Aperture Radar (SAR) images a target region reflectivity function in the multi-dimensional spatial domain of range and cross-range with a finer azimuth resolution than the one provided by any on-board real antenna. Conventional SAR techniques assume a single reflection of transmitted waveforms from targets. Nevertheless, new uses of Unmanned Aerial Vehicles (UAVs) for civilian-security applications force SAR systems to work in much more complex scenes such as urban environments. Consequently, multiple-bounce returns are additionally superposed to direct-scatter echoes. They are known as ghost images, since they obscure true target image and lead to poor resolution. All this may involve a significant problem in applications related to surveillance and security. In this work, an innovative multipath mitigation technique is presented in which Time Reversal (TR) concept is applied to SAR images when the target is concealed in clutter, leading to TR-SAR technique. This way, the effect of multipath is considerably reduced -or even removed-, recovering the lost resolution due to multipath propagation. Furthermore, some focusing indicators such as entropy (E), contrast (C) and Rényi entropy (RE) provide us with a good focusing criterion when using TR-SAR.
International
Si
Congress
45th IEEE International Carnahan Conference on Security Technology (ICCST 2011)
960
Place
Mataró, Barcelona, España
Reviewers
Si
ISBN/ISSN
978-1-4577-0901-2
Start Date
18/10/2011
End Date
21/10/2011
From page
1
To page
7
Proceedings of the ICCST 2011
Participants
  • Autor: Imanol De Arriba Ruiz UPM
  • Autor: Felix Perez Martinez UPM
  • Autor: José María Muñoz Ferreras Universidad de Alcalá de Henares
Research Group, Departaments and Institutes related
  • Creador: Departamento: Señales, Sistemas y Radiocomunicaciones