近場毫米波成像和散射體電磁參數(shù)提取的研究
[Abstract]:In order to meet the urgent need of security, most of the new imaging systems adopt millimeter wave imaging technology. This paper starts with the theoretical foundation of the imaging algorithm, uses the near-field millimeter wave SAR imaging technology, systematically deduces its imaging algorithm formula, and carries on a series of simulation verification to the millimeter wave imaging algorithm. The acquisition of electromagnetic parameters of scattering objects and the construction of imaging system platform are studied in detail. The main work of this paper is as follows: (1) the basic millimeter wave imaging theory is studied. The principle, working mode and resolution of SAR imaging technology are studied. The theoretical basis of millimeter-wave imaging is studied, and the millimeter-wave holographic imaging algorithms for single-frequency and wideband imaging are derived, respectively. The image reconstruction parameters such as sampling interval and resolution are analyzed. (2) Cylindrical millimeter wave SAR imaging and its simulation verify that the formula of cylindrical millimeter wave SAR imaging algorithm is systematically derived for near-field conditions. The relationship among system bandwidth, maximum frequency interval and maximum angular interval is studied at different resolution. In this paper, the influence of angle interval of receiving antenna array and system bandwidth on imaging resolution is analyzed by using the simulation imaging of metal plate. Electromagnetic inverse scattering imaging of various shapes, metals and non-metallic materials is realized by simulation, and the algorithm can be used to reconstruct the images. Simulation has realized the imaging of human body carrying hidden objects, and the imaging algorithm can be used to distinguish the human body from the lossy medium. (3) the method of extracting electromagnetic parameters based on millimeter wave SAR imaging is proposed based on millimeter wave SAR imaging method. A method of extracting electromagnetic parameters based on millimeter wave SAR imaging is proposed, which is based on the variation of the relative dielectric constant of the dielectric body and the free space and the velocity of electromagnetic wave propagating in different media. The method is verified by simulation. For different lossless media and lossy medium, the relative dielectric constant deviation is about 15%. (4) the near-field millimeter wave SAR imaging system is designed and constructed, and the system of near-field millimeter wave SAR imaging platform is designed and constructed at 2GHz ~ (18 GHz), respectively. Under different frequency bands of 17GHz~26.5GHz, the mixture of metal plate, aluminum tank (containing liquid), metal and wood block were tested and reconstructed. The final imaging results are in good agreement with the simulation results and are similar to the expected results. The correctness of the simulation results and the feasibility of the algorithm are verified, and the correctness of the imaging system is also verified.
【學位授予單位】:南京航空航天大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TN957.52
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