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Partially coherent radar unties range resolution from bandwidth limitations.
Rony Komissarov1, Vitali Kozlov1, Dmitry Filonov1
1School of Electrical Engineering, Tel Aviv University, Tel Aviv, 69978, Israel.
Nature Communications
|March 31, 2019
Summary
This study introduces a novel partially coherent radar system that achieves superior range resolution, significantly outperforming traditional coherent radars. This breakthrough offers enhanced target discrimination capabilities, even with limited bandwidth, benefiting industries like autonomous driving.
Area of Science:
- Physics
- Electrical Engineering
- Signal Processing
Background:
- Traditional radar systems rely on signal bandwidth for range resolution, limiting performance when bandwidth is constrained.
- Distinguishing closely situated targets (range resolution) is a critical challenge in various sensing applications.
Purpose of the Study:
- To demonstrate a novel ranging system with range resolution largely independent of bandwidth limitations.
- To experimentally validate a partially coherent radar approach for enhanced target discrimination.
Main Methods:
- Development of a partially coherent radar system that sweeps over the signal's coherence length.
- Experimental comparison of the novel system against standard coherent radars with identical bandwidths.
- Theoretical framework development to analyze resolution limits and trade-offs.
Main Results:
- The partially coherent radar demonstrated over an order of magnitude improvement in resolving targets compared to coherent radars of the same bandwidth.
- Superior range resolution was achieved with bandwidth limitations being almost entirely overcome.
- Theoretical analysis indicates potential for unbounded resolution improvement with a trade-off in sweep time.
Conclusions:
- Partially coherent radar offers a paradigm shift in achieving high range resolution, overcoming conventional bandwidth constraints.
- This technology presents viable solutions for applications demanding high accuracy and resolution in bandwidth-limited scenarios.
- Potential applications include autonomous vehicles, optical imaging, and astronomical observations.
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