Ka波段双极化直接检波式全功率辐射计研究

Research on Ka-band Dual-polarization Direct Detection Total Power Radiometer

提出一种新型的双极化毫米波(MMW)全功率辐射计结构,通过两路直接检波式接收机接收目标辐射信号的2个正交极化分量对目标进行检测识别。在论述其系统结构和工作原理基础上,对系统性能进行了分析。分析表明:此辐射计温度灵敏度高,输出信号信噪比好,作用距离远,并对存在水平、垂直极化视在温度差的虚假目标有较好的识别性能。

A novel dual-polarization millimeter wave （MMW） total power radiometer was proposed, which composed of two direct detection receivers used for receiving two orthogonal polarization components of the target radiation signals, to detect and identify the target. On the basis of discussing the theory and the configuration of the system, the performance of the system was analyzed. The analysed results show that the radiometer has high temperature sensitivity, good signal-to-noise ratio and large target detection range, and can identify the false target which has different apparent temperatures at vertical and horizontal-polarized radiations.