Target Detection Using Fused Unidentical Photonics-Based LFM Sub-Band Radar Signals With an Adaptive Feed Forward Network Equalizer
Nakarmi B. Islam S.M.R. Parajuli H.N. Ukaegbu I.A. Ashimbayeva A. Molardi C. Subash T.D. Wang X. Pan S.
2025Institute of Electrical and Electronics Engineers Inc.
IEEE Access
2025#1324080 - 24090 pp.
To address the challenges of costly frontend high frequency opto-electronics devices and the requirement of high bandwidth for improved range, resolution several band fusion techniques are proposed in this work. However, conventional band fusion techniques fuse the bands with identical bandwidth and same chirp rates. This paper proposes and experimentally demonstrates sub-bands fusion of photonically generated linear frequency modulated (Ph-LFM) radar signals with unidentical bandwidth and chirp rates using an adaptive, delay-less feed-forward network equalizer (FFNE). We demonstrate this using optical injection in a semiconductor laser to generate Ph-LFM signals at different IEEE X-KA radar sub-bands: 19.25-23.94 GHz and 24.06-28.31 GHz (bandgap 0.12 GHz), 19.69-23.06 GHz and 23.625-27 GHz (bandgap 0.56 GHz), and 8-11.5 GHz and 12.75-17 GHz (bandgap 1.25 GHz). Time-frequency analysis (TFA) was used to obtain sub-bandgap signals of 0.12 GHz, 0.56 GHz, and 1.25 GHz which are coherently fused using the FFNE with a particle swarm optimization (PSO) algorithm to optimize complex-valued weights. The method is evaluated by measuring the range resolution and peak-to-sidelobe level (PSL) in detecting two objects separated by 2 cm and 3 cm. The FFNE achieves significant improvement over 10 dB in PSL and resolves previously unresolvable distances, with maximum range resolutions of 1.8 cm, 2.2 cm, and 2 cm, closely matching theoretical values for full-band LFM signals with bandwidth of 9.06 GHz, 7.31 GHz, and 9 GHz, respectively. Experimental results demonstrate the FFNEs superior performance in enhancing range resolution and PSL in multi-sub-band radar systems compared to scenarios without FFNE.
coherent processing , feed-forward equalizer , linear frequency modulation , optical injection , photonic radar , Sub-band fusion
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Nanjing University of Aeronautics and Astronautics, Key Laboratory of Radar Imaging and Microwave Photonics, Ministry of Education, Nanjing, 210016, China
Nazarbayev University, Integrated Device Solutions and Nanophotonics Laboratory, School of Engineering and Digital Sciences, Astana, 010000, Kazakhstan
The University of West Alabama, Division of Engineering Technology, Livingston, 35470, AL, United States
Nazarbayev University, School of Engineering and Digital Sciences, Department of Electrical and Computer Engineering, Astana, 010000, Kazakhstan
Zhejiang Ocean University, School of Marine Engineering Equipment, Zhejiang, Zhoushan, 316000, China
Nanjing University of Aeronautics and Astronautics
Nazarbayev University
The University of West Alabama
Nazarbayev University
Zhejiang Ocean University
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