红外与毫米波学报, 2009, 28 (1): 11, 网络出版: 2010-12-13
3mm辐射成像研究
RESEARCH ON 3 mm RADIOMETRIC IMAGINGLI
被动毫米波成像 迪克式辐射计 超分辨 频谱外推 最大似 passive millimeter-wave imaging dicke-radiometer super-resolution spectral extrapolation maximum-likeli-hood
摘要
在研究毫米波无源成像原理的基础上,设计出了简洁的3mm超外差迪克式毫米波辐射计,并进行了成像实验.为了解决毫米波被动成像中由于天线孔径尺寸和衍射受限所带来的固有空间分辨率低的问题,采用了一种改进的最大似然超分辨算法进行频谱外推.实验结果表明该算法有很好的频谱外推能力,对图像分辨率的提高和超分辨性能的改善有明显效果.3mm迪克式辐射计的主要参数如下:中心频率为91.5GHz,带宽为4GHz,温度灵敏度为0.55K,线性度为0.9999.
Abstract
On the basis of studying the principle of passive millimeter wave (PMMW) imaging, a compact 3mm super-heterodyne Dicke-radiometer was developed and the imaging experiment was done. An improved maximum-likelihood (IML) super-resolution algorithm was proposed in order to solve the inherent problem of poor resolution imaging, which was caused by limited aperture dimensions and the consequent diffraction limit. Experiment results indicate that the algorithm is able to complete spectral extrapolation, and enhance super-resolution performance and spatial resolution. The primary parameters of the 3mm band radiometer are given as follow: the center frequency is 91.5 GHz, the system band-width is 4GHz, the sensitivity of temperature is 0.55K and the linearity is 0.9999.
李良超, 杨建宇, 姜正茂, 郑鑫. 3mm辐射成像研究[J]. 红外与毫米波学报, 2009, 28(1): 11. Liang-Chao, YANG Jian-Yu, JIANG Zheng-Mao, ZHENG Xin. RESEARCH ON 3 mm RADIOMETRIC IMAGINGLI[J]. Journal of Infrared and Millimeter Waves, 2009, 28(1): 11.