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Performance investigation of an ambiguity function-shaped waveform (AFSW) using a photonics-based radar system
Optics Express
|February 14, 2023
Summary
This study introduces ambiguity function-shaped waveforms (AFSW) for millimeter-wave photonics radar, significantly improving target detection. AFSW achieved a 38.35 dB PSR, outperforming conventional FMCW radar.
Area of Science:
- Radar Systems Engineering
- Photonics and Optics
- Signal Processing
Background:
- Millimeter-wave (mmWave) radar systems are crucial for high-resolution sensing.
- Photonics-based radar offers unique advantages in signal generation and processing.
- Conventional frequency-modulated continuous wave (FMCW) radar suffers from limited peak-to-sidelobe ratio (PSR).
Purpose of the Study:
- To investigate the performance of ambiguity function-shaped waveforms (AFSW) in a 100 GHz photonics-based radar system.
- To compare AFSW performance against conventional FMCW radar.
- To analyze the impact of optical system impairments on AFSW performance.
Main Methods:
- Experimental implementation of an AFSW using a millimeter-wave photonics-based radar.
- Comparative performance analysis between AFSW and FMCW waveforms.
- Systematic evaluation of AFSW under optical modulator nonlinearity, bias drift, and sampling offset errors.
Main Results:
- AFSW achieved a significantly higher PSR of 38.35 dB compared to 14.5 dB for FMCW.
- Demonstrated the feasibility of AFSW in a practical photonics radar system.
- Quantified the effects of specific optical impairments on AFSW performance.
Conclusions:
- AFSW offers superior target detectability in photonics-based radar systems.
- The AFSW is a promising waveform for enhancing radar performance in challenging environments.
- Understanding and mitigating optical impairments are critical for robust AFSW operation in photonics radar.
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