Abstract
A new adaptive detection strategy for passive radar systems that fruitfully capitalizes on signals, simultaneously emitted by the same transmitter of opportunity at different carrier frequencies and collected by a set of differently polarized surveillance antennas is derived. Based on recent results that demonstrated the benefits provided by proper strategies to exploit polarimetric diversity, the authors aim at further improving the target detection performance by combining polarimetric and frequency diversity. Real data collected through an FM radio-based passive radar prototype is used to extensively demonstrate the effectiveness of the derived strategy with respect to state-of-the-art approaches. The conceived solution is proved to successfully enhance the capability to discriminate targets, thanks to an effective disturbance rejection performed at each frequency channel as well as a target echo enhancement and an increased robustness to the time-varying characteristics of the exploited source of opportunity.
Highlights
Passive bistatic radar (PBR), or passive coherent location (PCL), technology exploits signals emitted by illuminators of opportunity (IOs) to detect and localize targets [1, 2]
We refer to the case of a multi‐channel PCL system exploiting N signals in the FM radio band for aerial surveillance, and we report in Figure 11 the total number of required floating‐point operations (FLOPs) versus the employed CPI
In order to get a practical idea of how the different strategies compare, we report in Figure 13 the raw detections obtained for the same 50 consecutive scans used in Figure 13 with Pfa = 10−5
Summary
Department of Information Engineering, Electronics and Telecommunications (DIET), Sapienza University of Rome, Rome, Italy Funding information The work has been partially supported by MIUR (Italian Ministry of Education, University and Research) under the project “S4E – Safety & Security Systems for Sea Environment ” – identification code SCN 00393
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