研究目的
Investigating the potential of ultrahigh range resolution enabled by synthetic linearly chirped THz photonic pulses.
研究成果
The proposed method successfully generates a linear frequency modulated pulse in the THz domain with a 40 GHz bandwidth, achieving an extremely high range resolution at mm-scale in multi-target positioning and ranging. This approach has great potential for ultrahigh resolution target detection and imaging.
研究不足
The system's performance is limited by the electronic THz receiver and amplifier, and the repetition rate of the pulse laser, which affects the achievable time-bandwidth products (TBWP) and ranging resolution.
1：Experimental Design and Method Selection:
The experiment involves generating dual-band THz LFM pulses using photonic frequency-to-time mapping (FTM) and photomixing, followed by digital synthesis to achieve a broader bandwidth.
2：Sample Selection and Data Sources:
Aluminum plates are used as targets for multi-target positioning and ranging.
3：List of Experimental Equipment and Materials:
Includes a mode-locked laser (MLL), dispersion compensation fiber (DCF), uni-travelling carrier photodiode (UTC-PD), THz lenses, and a digital sampling oscilloscope (DSO).
4：Experimental Procedures and Operational Workflow:
Optical pulses are shaped, filtered, and chirped before being converted to THz signals, transmitted, reflected by targets, and then detected and analyzed.
5：Data Analysis Methods:
Short-time Fourier transform (STFT) and cross-correlation processing are used for analyzing the reflected signals and determining target positions.
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