射电成像中电离层扰动的最小熵校正方法

Minimum-entropy correction of phase errors caused by ionospheric disturbance

摘要:

在合成孔径射电成像中，电离层的扰动会在接收信号中引入相位误差，导致图像出现模糊和漂移。本文提出了一种新方法，以校正这种相位误差。使用熵作为衡量射电天文图像质量的指标，熵越小代表图像质量越高，当熵值达到最小时，认为相位误差被校正。相比其他传统方法，本方法仅利用脏图本身就能够校正相位误差。

Abstract:

This paper presents a new method to correct the phase error caused by ionospheric disturbance in the synthetic aperture radio imaging. Entropy is used to measure the quality of the image. Smaller entropy means better quality. The phase error is corrected such that the entropy of the image is minimized. Compared with the traditional methods, the proposed scheme only uses the dirty map itself to correct the phase error.