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Broadband radar invisibility with time-dependent metasurfaces
V Kozlov1, D Vovchuk2, P Ginzburg2
1School of Electrical Engineering, Tel Aviv University, 69978, Tel Aviv, Israel. vitaliko@mail.tau.ac.il.
Scientific Reports
|July 10, 2021
Summary
This study introduces a novel radar countermeasure using signal processing to achieve object invisibility. A temporally modulated coating dynamically alters reflected radar signals, effectively hiding moving targets from detection systems.
Area of Science:
- Electromagnetics and Signal Processing
- Radar Countermeasures
- Metamaterials
Background:
- Radar surveillance systems are ubiquitous in modern security.
- Metamaterial-based invisibility cloaking faces limitations due to narrow bandwidth.
- Existing radar systems rely on signal processing for target detection.
Purpose of the Study:
- To develop a novel radar countermeasure for object concealment.
- To overcome the bandwidth limitations of traditional invisibility cloaking.
- To exploit signal-processing vulnerabilities in radar systems.
Main Methods:
- Proposed a signal-processing approach for radar invisibility.
- Developed a temporally modulated coating for dynamic phase adjustment.
- Demonstrated concealment by imposing a Doppler shift to negate target motion.
Main Results:
- Achieved complete concealment of a 0.25 m² moving metal plate.
- Operated across a broad frequency range (20% bandwidth around 1.5 GHz).
- Rendered the moving target undetectable by causing radar systems to perceive it as static.
Conclusions:
- Signal processing offers a viable alternative to metamaterial cloaking for radar invisibility.
- Temporally modulated coatings can effectively counter modern radar systems.
- Exploiting Doppler signatures is a key strategy for radar evasion.
