Imaging system based on phase modulation active frequency selective surface and imaging method thereof
A frequency selective surface, phase modulation technology, applied in electrical components, electromagnetic wave detection, antennas, etc., can solve the problems of high cost and high power consumption, and achieve the effect of low power consumption, low hardware cost and high system flexibility
Active Publication Date: 2021-08-03
ZHEJIANG UNIV
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[0003] Traditional microwave imaging systems use phased array or synthetic aperture radar for beam scanning imaging, which has high cost and high power consumption
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[0055] An implementation process of the present invention will be described in detail below with reference to the drawings and embodiments.
[0056] The specific implementation is as figure 1 As shown, the imaging area 6 is located on the xoy plane, N active frequency selective surfaces are placed on a plane parallel to the imaging area, and N / 2 transmitting antennas 4 and N / 2 receiving antennas 5 are respectively arranged opposite to each other on N / After 2 transmitting active frequency selective surfaces 2 and N / 2 receiving active frequency selective surfaces 3, a single active frequency selective surface contains Ns units. N / 2 transmitting antennas 4 emit and irradiate the electromagnetic waves fed in from the output port of the transmitting power dividing network to the transmitting active frequency selective surface 2, and before the electromagnetic waves pass through the transmitting active frequency selective surface 2, the above surface is All phase modulation units...
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The invention discloses an imaging system based on a phase modulation active frequency selective surface and an imaging method thereof. The system comprises active frequency selection surfaces, a transmitting and receiving antenna, a phase control system, a radio frequency transmitting and receiving system and a transmitting and receiving power division network, and each active frequency selection surface is a two-dimensional surface formed by uniformly arranging phase modulation units capable of being programmed independently at intervals and has band-pass filtering characteristics for electromagnetic waves fed in space. And a varactor is added to carry out random binary phase modulation on the phase of the space feed electromagnetic wave. The system is used for randomly modulating an incident field generated by a transmitting antenna and randomly modulating a scattered field generated by an imaging target, realizes random irradiation of an imaging area and random receiving of scattered echoes, reduces redundancy between measurement in different random modes, is beneficial to improving imaging quality, and has the advantages of low hardware cost, high integration level, simple operation, fast imaging, expandable aperture and the like.
Description
technical field [0001] The invention relates to an imaging system and an imaging method, in particular to an imaging system and an imaging method based on a phase modulation active frequency selective surface. Background technique [0002] Microwave, millimeter wave, and terahertz imaging have been extensively studied in the past few decades, and their application scenarios include security inspection, medical imaging, geographic detection, through-wall imaging, etc. In recent years, with the increase of terrorist attacks, the demand for large-scale security inspection equipment in public places such as airports, stations, and shopping malls has continued to increase. Microwaves have good penetrability to clothing and will not cause harm to the human body, so they are very suitable in the security system. Researchers at home and abroad are also constantly exploring low-cost, high-resolution microwave security imaging systems. [0003] The traditional microwave imaging syst...
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Login to View More IPC IPC(8): H01Q15/00H01Q3/34G01V3/12
CPCH01Q15/002H01Q3/34G01V3/12
Inventor 张倩冉立新
Owner ZHEJIANG UNIV