8mm band 2-dimensional synthetic aperture microwave radiometer (BHU-2D)
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摘要: 介绍了二维综合孔径微波辐射计BHU-2D成像原理、系统构成及性能指标、校正方法、部分成像实验及其成像结果.BHU-2D工作在8mm波段,共有10个接收单元,天线阵列为T形结构,接收机为二次变频超外差结构,I/Q解调及相关运算采用了数字方式并通过软件实现,采用点辐射源校正方法及背景对消反演算法校正系统通道间不一致、相关偏置及混叠误差.目前,BHU-2D已经研制完成,并进行了系统测试及成像实验,得到了室内人工场景及人物场景的辐射亮温分布图像.Abstract: The imaging principle, system structure and characteristics, calibration approach, several imaging experiments and imaging results of 2-dimensional synthetic aperture microwave radiometer BHU-2D (BeiHang University 2-Dimensional) were presented. BHU-2D operates at 8mm wave band and has 10 receiving channels. The antenna array of BHU-2D is T-shape; receivers- configuration is super heterodyne and has two down converters. I/Q demodulation and correlation of BHU-2D were carried out with digital method and by software; the channel unbalance, correlation bias and aliasing errors were calibrated with radiated point source and background drop inversion algorithm. At present, BHU-2D was accomplished and has been undergoing testing and imaging experiments, and the radiometric brightness distribution images of man-made scenes and the person in lab were obtained.
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Key words:
- microwave radiometer /
- 2-dimensional synthetic aperture /
- 8mm wave band /
- BHU-2D
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