Millimeter wave and terahertz multi-band radar detection imaging system and method

Abstract

The invention discloses a millimeter wave and terahertz multi-band radar detection imaging system and method. The method is composed of a system method composed of a low-frequency-band radar signal generator, a millimeter wave and terahertz multi-frequency-band frequency multiplication link and amplification module, a millimeter wave and terahertz multi-frequency-band combiner, a millimeter wave and terahertz transmitting / receiving antenna, a millimeter wave and terahertz frequency band frequency divider, a millimeter wave and terahertz multi-frequency-band low-noise power amplifier and receiving link, an intermediate-frequency signal processing and acquisition module, a radar signal storage and image processor and the like, and a corresponding multi-frequency-band radar detection imaging algorithm module. Millimeter wave and terahertz multi-band combined emission and shunt receiving are adopted in the system method, and multi-band signal splicing and related processing methods are adopted in the signal processing and detection imaging algorithm level, so that the requirements of millimeter wave and terahertz band broadband signal generation, amplification and receiving on high-band devices are reduced, high-power, high-quality and flexible broadband millimeter wave and terahertz frequency band detection imaging can be realized, and a new realization way is provided for wide application of millimeter wave and terahertz frequency band refined detection imaging.

Description

technical field [0001] The invention relates to a millimeter wave and terahertz multi-band radar detection and imaging system and method, belonging to the technical field of millimeter wave and terahertz, and in particular to the millimeter wave and terahertz frequency band radar detection and imaging technology. Background technique [0002] Millimeter-wave and terahertz radar technologies are widely used in fields such as security inspection, non-destructive detection, airborne ground reconnaissance, space debris detection, cloud detection, and planetary landing due to their broadband high-resolution, miniaturization, and unique atmospheric transmission characteristics. For the application prospect of terahertz radar technology, see Wang H Q, Deng B, Qin Y L. Review of terahertz radar technology [J]. Journal of Radars, 2018, 7(1):1–21. At home and abroad, millimeter-wave and terahertz radar technologies have been widely concerned, and microwave up-conversion and optical do...

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Problems solved by technology

However, on the one hand, this method is limited by the frequency sweep source and the bandwidth of the multiplication link, and there is a bottleneck in the imaging resolution. On the other hand, after the up-conversion to the millimeter-wave and terahertz frequency bands, the signal bandwidth is wide, the amplification is difficult, and the signal quality is poor. , limiting the wide application of millimeter-wave and terahertz radar high-resolution imaging systems

Optical down-conversion obviously has ultra-broadband characteristics, and the frequency can range from 0.1 to 30THz. Zhao et al. reported that the resolution of ultra-broadband millimeter-wave and terahertz imaging generated by laser-induced gas plasma can reach 20 microns, which is about 38 minutes of the wavelength. One of them (Zhao Jiayu, Chuwei, Guo Lanjun et al., "Terahertz imaging with sub-wavelength resolution by femtosecond laser filament in air, Scientific Reports," 2014, 4(1): 3880), but optical down-conversion millimeter wave and Hertz signal power is usually low, and the working distance is short (usually no more than 1m). How to amplify such a wide signal is almost an insoluble problem, which directly limits the scope of application of this method.

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