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Dechirping Compression Method for Nonlinear Frequency Modulation Waveforms
摘要： This letter proposes a novel dechirp processing method for wideband nonlinear frequency modulation (NLFM) waveform which enables low sampling rate of data. As we know, NLFM waveform can easily realize optimal shape of power spectral density which helps to achieve better pulse compression result with low range sidelobes without signal-to-noise ratio degradation caused by weighting as we usually do for LFM waveforms. In the approach, hamming window is adopted in the generation of the NLFM waveform for better balance on the low range sidelobes and a relative small bandwidth. In dechirp operation, the NLFM radar echoes are mixed with a local reference LFM signal, and thus narrowband signals are resulted and only low sampling rate is needed. The dechirped NLFM signals are then up-sampled and inverse dechirped by software and ?nally matched ?ltering is conducted to complete pulse compression. Both numerically simulated data and real radar data are processed to verify the effectiveness of the proposed method.
关键词： nonlinear frequency modulation (NLFM),sampling rate,pulse compression,Dechirp processing
更新于2025-09-23 15:23:52
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Photonics-based Multiband Radar Applying an Optical Frequency Sweeping Comb and Photonic Dechirp Receiving
摘要： A photonics-based multiband radar is proposed based on an optical frequency sweeping comb and photonic dechirp receiving. The proposed radar has a simple structure, and it is capable to simultaneously generate and process multiple in different frequency bands. Besides, the radar receiver can achieve fast or real-time signal processing with low-speed electronics. In the proof-of-concept experiment, a photonics-based dual-band radar working in K-band (19-22 GHz) and Ka-band (34-37 GHz) is demonstrated with a bandwidth of 3 GHz in each band and a sampling rate of 100 MSa/s in the receiver.
关键词： dechirp processing,multiband radar,optical frequency comb,microwave photonics
更新于2025-09-19 17:15:36