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基于Matlab平台搭建一维综合孔径仿真系统,根据系统的组成结构及工作过程建立模型,主要包括目标场景生成模块、辐射计系统仿真模块和图像重构模块。目标场景生成模块输出天线视在亮温;辐射计系统仿真模块根据综合孔径辐射计测量原理并结合一维天线阵列,生成可见度函数;图像重构模块利用二维天线方向图转换的方法,实现可见度函数到亮温的转换。利用该系统能够仿真太阳和银河在视场中位置的年际变化,评估太阳和银河直射在一年中对系统输出亮温造成的干扰偏差。
Based on the Matlab platform, a one-dimensional synthetic aperture simulation system is set up, and the model is constructed according to the system structure and working process. The system mainly includes the target scene generation module, the radiometer system simulation module and the image reconstruction module. The target scene generating module outputs the apparent bright temperature of the antenna; the radiometer system simulation module generates the visibility function according to the measurement principle of the integrated aperture radiometer and the one-dimensional antenna array; the image reconstruction module realizes the visibility by using the method of the two-dimensional antenna pattern conversion Function to light temperature conversion. The system can be used to simulate the interannual variation of the solar and galactic positions in the field of view and to assess the interference deviation caused by the solar and the Milky Way direct output to the system during the year.