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Photonic-based radar for distance and velocity measurement with multiformat waveforms
Applied Optics
|January 11, 2023
Summary
This study introduces a novel radar system using multiformat waveforms for precise distance and velocity measurements. The filterless design enhances bandwidth and achieves high accuracy, distinguishing target direction.
Area of Science:
- Radar Systems Engineering
- Optical Signal Processing
- Electromagnetics
Background:
- Traditional radar systems face limitations in bandwidth and interference suppression.
- Accurate measurement of distance and velocity is crucial for various applications.
- Optical modulation techniques offer potential for advanced radar signal generation.
Purpose of the Study:
- To propose and demonstrate a novel radar system capable of generating multiformat waveforms.
- To achieve high-precision measurements of distance and velocity.
- To enhance radar performance through an innovative, filterless optical design.
Main Methods:
- Utilizing a dual-polarization, dual-parallel Mach-Zehnder modulator (DP-DPMZM) for carrier-suppressed single-sideband (CS-SSB) modulation.
- Generating switchable down-, up-, dual-chirp, and amplitude shift keying (ASK) signals with flexible frequency and bandwidth.
- Incorporating an optical switch (MZM) for pulsed signal generation and dechirping interference suppression.
- Employing a dual-drive MZM (DDMZM) for the dechirping process without using filters.
Main Results:
- Successful generation of various waveforms including pulsed signals.
- Demonstrated suppression of continuous wave (CW) interference.
- Achieved distance measurement error of less than 2 cm.
- Achieved velocity measurement error of less than 0.180 m/s.
- Successfully distinguished the direction of the target.
Conclusions:
- The proposed filterless radar system effectively measures distance and velocity with high accuracy.
- The novel optical modulation approach enables flexible waveform generation and robust interference suppression.
- This technology offers significant advantages for advanced radar applications requiring extended bandwidth and precision.
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