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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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Microwave photonic radar system with improved SNR performance utilizing optical resonant amplification and random
Optics Express
|May 9, 2023
Summary
This study introduces a novel microwave photonic radar system that significantly enhances signal-to-noise ratio (SNR) for detecting weak targets. The improved radar system achieves better imaging quality by suppressing noise and amplifying weak echoes.
Area of Science:
- Microwave Photonics
- Radar Systems
- Signal Processing
Background:
- Microwave photonic (MWP) radar systems face challenges with detecting weak targets due to low signal-to-noise ratio (SNR).
- Existing methods struggle to effectively amplify weak echoes while suppressing noise in MWP systems.
Purpose of the Study:
- To propose and experimentally demonstrate an MWP radar system with enhanced SNR performance.
- To enable the detection and imaging of previously noise-hidden weak targets.
Main Methods:
- Designing novel radar waveforms using random Fourier coefficients for reconfigurable performance and reduced optical nonlinearity.
- Implementing resonant amplification in the optical domain to achieve high optical gain and in-band noise suppression.
- Conducting experiments to verify SNR improvement and imaging quality enhancement.
Main Results:
- Achieved a maximum SNR improvement of 3.6 dB with 28.6 dB optical gain for the proposed waveforms.
- Demonstrated significant quality enhancement in microwave imaging of rotating targets compared to linear frequency modulated signals.
- Verified the feasibility of SNR improvement across a wide input SNR range.
Conclusions:
- The proposed MWP radar system effectively improves SNR performance.
- The system shows great application potential in SNR-sensitive scenarios, enabling enhanced detection and imaging capabilities.
