研究目的
To propose and demonstrate a photonics-based multiband radar system capable of simultaneously generating and processing multiple linear frequency modulation (LFM) signals in different frequency bands with a simple structure and low-speed electronics for fast or real-time signal processing.
研究成果
The proposed photonics-based multiband radar system is feasible, offering a simple structure, good flexibility, and the ability to achieve high range resolution (approximately 5 cm) with low-speed electronics, making it a promising solution for multiband radar applications.
研究不足
The system's complexity and cost may be high due to the use of multiple optical and electronic components; bandwidth in each frequency band is constrained by the parameters of the AWG and RF source, and interference between bands must be carefully managed through proper frequency setting.
1：Experimental Design and Method Selection:
The system uses an optical frequency sweeping comb generated via a cascaded Mach-Zehnder modulator (MZM) and phase modulator (PM) to produce wideband LFM signals. Photonic dechirp receiving is employed for signal processing, enabling low-speed electronic sampling.
2：Sample Selection and Data Sources:
Not explicitly specified; the experiment involves generating and processing radar signals in K-band and Ka-band.
3：List of Experimental Equipment and Materials:
Includes laser diode (LD), optical couplers (OC), MZM, PM, optical band-pass filters (OBPF), photodetectors (PD), electrical amplifiers (EA), low noise amplifiers (LNA), low-pass filters (LPF), analog-to-digital converter (ADC), digital signal processing (DSP), arbitrary waveform generator (AWG), microwave signal generator, erbium-doped fiber amplifier (EDFA), and various specific models as listed in the products section.
4：Experimental Procedures and Operational Workflow:
Light from LD is split, modulated by MZM with LFM signal from AWG, filtered by OBPF, modulated by PM with RF signal, combined with optical carrier, photodetected to generate LFM signals, separated by BPFs, amplified, transmitted, received, dechirped via MZM modulation and PD conversion, filtered by LPF, sampled by ADC, and processed by DSP.
5：Data Analysis Methods:
Waveforms and power spectra of dechirped signals are analyzed using fast Fourier transform (FFT) to determine frequency peaks and bandwidths for range resolution estimation.
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Laser Diode
NLL04
TeraXion
Used as the light source in the optical system.
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Arbitrary Waveform Generator
8195A
Keysight
Generates the LFM signal that drives the MZM.
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Optical Spectrum Analyzer
AQ6370C
Yokogawa
Measures optical spectra with high resolution.
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Microwave Signal Generator
E8257D
Agilent
Generates RF signal to drive the phase modulator.
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Electrical Spectrum Analyzer
FSV40
R&S
Measures electrical spectra of generated signals.
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Real-Time Oscilloscope
DSO-X 92504A
Keysight
Samples and displays waveforms of dechirped signals.
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Mach-Zehnder Modulator
FTM7938EZ
Fujitsu
Modulates light with LFM signal for optical carrier suppressed modulation.
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Erbium-Doped Fiber Amplifier
Amonics Ltd.
Boosts optical power after modulation.
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Optical Band-Pass Filter
XTM-50
Yenista
Filters optical signals to select specific wavelengths.
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Phase Modulator
EOSPACE, Inc.
Modulates light with RF signal to generate optical comb.
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Photodetector
XPDV2120RA
u2t
Converts optical signals to electrical signals for frequency mixing.
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Electrical Amplifier
CMP-0.1G40G-3020-K
CONNPHY
Amplifies electrical signals before transmission.
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Low Noise Amplifier
Amplifies received radar echoes with low noise.
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Low-Pass Filter
Filters dechirped signals to select low-frequency components.
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Analog-to-Digital Converter
Samples electrical signals for digital processing.
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Photodetector
CONQUER Inc.
Used in the receiver for optical-to-electrical conversion during dechirp processing.
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