Terahertz frequency band single-photon radar system and target detection method thereof

Abstract

The invention relates to a terahertz frequency band single-photon radar system and a target detection method thereof. The system comprises a transmitting module, a receiving module, a signal processing module, a model generation module and an output module. Terahertz wave pulse signals are repeatedly generated at a transmitting end through a terahertz QCL source and are transmitted to a target; terahertz single photon echo signals are detected and received at a receiving end. The distance and Doppler frequency information of a target are obtained by performing single-photon counting statisticson echo signals; through establishing a detection target echo model based on terahertz frequency band single photons and analyzing time domain distribution characteristics, a target distance and Doppler frequency information acquisition method is finally obtained so that target detection sensitivity reaches a single photon magnitude. The terahertz radar technology and the single-photon detectiontechnology are organically combined, detection of extremely weak echo signals of a remote non-cooperative target can be achieved, and the bottleneck problem that the action distance is limited in existing terahertz target detection application is solved.

Description

technical field [0001] The invention relates to the technical field of terahertz single-photon detection and imaging, in particular to a terahertz frequency-band single-photon radar system and a target detection method thereof. Background technique [0002] Terahertz (THz) waves refer to electromagnetic waves with a frequency in the range of 0.1-10 THz and a wavelength in the range of 30-3000 μm, and the corresponding photon energy is 0.414-41.4 meV. Terahertz waves are between microwave and infrared, and are in the transition frequency band from electronics to optics. In recent years, with the gradual development of terahertz wave generation, detection, transmission and other technologies, the terahertz frequency band has become a new strategic commanding height for military high-tech competition, and terahertz radar experimental systems continue to emerge. Compared with microwave radar, terahertz radar has short wavelength and wide bandwidth, and has extremely high "space...

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Problems solved by technology

[0006] Based on this, it is necessary to provide a terahertz frequency band single-photon radar system and target detection method for the above technical problems, which can realize the detection of extremely weak target echoes at low signal-to-noise ratios, and solve the problem of existing terahertz target detection applications. Bottleneck issues such as limited distance

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