毫米波近程主动扫描成像研究

摘要

文章介绍了一套Ka波段毫米波近程成像系统。振荡器产生频率为35GHz的毫米波，通过透镜天线照射到目标各点进行扫描，检测目标各点回波信号的强弱，采集信号并传输数据给计算机，最终得到目标各点的反射特性，做成毫米波图像。成像原理，即对低噪放和检波放大模块进行了性能测试，利用成像系统对携有金属锉刀的人体模型进行了成像实验得到可辨别的图像。此系统可用于机场，车站，码头的安全检查中。%This paper introduces the ka-band millimeter wave near-field imaging system. The oscillator gives the millimeter wave with the frequency of 35GHz. The wave transmits by the lens antenna and irradiates the target points. The system detects the strength of the each point＇ s echo, samples the signal and transmits the date to the computer for obtaining the imaging. It states the imaging theory, tests the LNA and the detector and is used for imaging the artificial model which carries the metal. The imaging shows the shape of the metal, so it demonstrates that the system can be used for security check in the airports, the stations and the wharfs.