旋转镜像综合孔径空间频率均匀采样方法

The Method of Uniform Spatial Frequency Sampling in Rotating Mirrored Aperture Synthesis

在地球静止轨道卫星上实现高分辨率微波辐射测量是微波遥感的重要研究内容。综合孔径系统的较高复杂度和镜像综合孔径系统组合测量在卫星平台上实现困难等问题,使得高分辨率微波辐射测量难以实现。因此提出旋转镜像综合孔径空间频域均匀采样方法。其核心思想是采用两个反射面提高空间分辨率,通过阵列旋转固定角度获得均匀频率采样实现图像重建。理论和仿真结果均表明:旋转镜像综合孔径空间频域均匀采样方法采用较少的天线数目实现了高分辨率测量,获得较好反演结果,同时用阵列的转动代替反射面的平动解决镜像综合孔径微波辐射测量在卫星平台上实现困难的问题。

Realizing the high spatial resolution microwave radiometric measurement is a significant research content for geostationary satellite. The complexity of aperture synthesis system and the difficulty of the combination measurement for the mirrored aperture synthesis system make the high spatial resolution measurement difficult in geostationary orbit. In the paper,the method of the uniform spatial frequency sampling in rotating mirrored aperture synthesis is proposed. The key concept is that two reflectors are applied to improve the spatial resolution,and the uniform UV sampling is generated by means of rotating the antenna array a fixed angle. The theory and simulation results demonstrate that the method of uniform spatial frequency sampling in rotating aperture synthesis can achieve the high spatial resolution,and the quality of the reconstructed image is good,meanwhile,the rotation of the antenna array is replaced the moving of the reflectors,which is easy to be implemented in geostationary orbit.