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目前,国际上多个科研小组相继开展了太赫兹逆散射成像方面的研究,已开发出多个太赫兹逆散射成像系统。其电磁散射模型及成像处理方式多借鉴于其他辐射源已经成熟的研究成果,例如:雷达目标散射中心模型及ISAR/SAR,Born/Rytov近似模型及层析成像。但上述方法直接应用于太赫兹波段将导致成像质量的下降。首先简要介绍了太赫兹雷达成像和太赫兹层析成像之间的关系,在分析两种成像方法特点的基础上,重点研究了大孔径、大带宽条件下的太赫兹逆散射成像,提出了一种基于Range-Doppler算法的改进成像方法。最后,利用该方法对中物院研制的0.14 THz雷达样机实验数据进行成像,并给出了典型目标的成像结果,验证了新成像方法的有效性。
At present, many international research groups have carried out research on terahertz inverse scattering imaging one after another, and several terahertz inverse scattering imaging systems have been developed. Its electromagnetic scattering model and imaging processing methods draw on other mature sources of radiation research, for example: radar target scattering center model and ISAR / SAR, Born / Rytov approximate model and tomography. However, the above method applied directly to the terahertz band will result in a decrease of the imaging quality. Firstly, the relationship between terahertz radar imaging and terahertz tomography is briefly introduced. Based on the analysis of the characteristics of the two imaging methods, the terahertz inverse scattering imaging with large aperture and large bandwidth is studied emphatically. Improved imaging method based on Range-Doppler algorithm. Finally, the experimental data of 0.14 THz radar prototype developed by CAS was used for imaging and the typical imaging results were given. The effectiveness of the new imaging method was verified.