星载W波段毫米波辐射计研究

在863-2项目支持下,开展了W波段毫米波辐射计的研究。其工作中心频率为90.5 GHz,带宽为2 GHz,积分时间为200 ms时其系统灵敏度达到0.6 K,线性度优于0.999。这些技术指标基本达到了星载应用的要求。为配合扫描成像研制了两套天线系统,一套为Cassegrain天线,另外一套为二元光学天线,它是利用光学衍射原理制成的位相型Fresnel波带片。二元天线具有设计灵活、加工方便、体积小、重量轻、旁瓣电平低和安装方便等优点。W波段微波辐射计系统在实验室内进
行了扫描成像试验,取得了W波段微波辐射计扫描图像。

Study of Spaceborne W-band Millimeter Wave Radiometer

The W\|band millimeter wave radiometer has been successfully developed under the support of 863\|2 projects. The operating frequency is 90.5 GHz and the bandwidth is 2 GHz. The sensitivity of the system is 0.6K and the integration time is 200 ms. The linearity is better than 0.999. The technical index attains the goal to be used in space. Two sets of antenna system have been studied in order to accomplish the work of scanning and imaging. One is Cassegrain and another is binary optical antenna. The principle of the binary optical antenna is optical diffraction. This kind of antenna has some advantages: flexible design, easily to be processed, small volume, light weight, low sidelobe and easily to be assembled. The scanning and imaging experiments of the W\|band microwave radiometer have been done in the laboratory and successfully got some images.