一种扩大8mm波段综合孔径辐射计成像视场的方法

A method to enlarge the FOV for 8 mm band synthetic aperture radiometer

针对8 mm波段综合孔径辐射计射频前端电尺寸较大、采用常规Y形阵列布局系统成像视场范围小的缺点,首先提出了一种星形天线阵列布局,它使可视度函数采样点之间的间隔变为天线单元间隔的一半,从而使系统的成像视场扩大到原来的两倍;然后,针对星形阵列可视度函数采样点缺失的问题,研究了背景对消与凸集投影相结合的图像反演算法,并进行了成像仿真.仿真结果验证了该反演算法的有效性.

The field of view （FOV） of the 8 mm band synthetic aperture radiometer with regular Y-shaped array is small due to the relative large electronic scale of the RF front. To overcome this disadvantage, a kind of star-shaped array is presented. In the star-shaped array, the visible distance is only half of that of the antennas, so it doubles the imaging FOV. To deal with the missing visibilities of the star-shaped array, an image restoration method based on back-dropping and projecting onto convex set （POCS） is presented. Imaging simulations were carried out. The simulations validate the effectivity of the presented method.