基于三亚非相干散射雷达的月球正面南北半球拼接成像研究

A mosaic imaging study of the northern and southern hemispheres of the nearside of the Moon based on the Sanya Incoherent Scatter Radar

当使用地基雷达并应用距离多普勒算法对月球正面进行成像时,不可避免会遇到“南北模糊”问题.这是由于距离多普勒成像算法对旋转的天体进行成像时,位于视赤道共轭的两点的回波在距离多普勒图像中是重叠在一起无法分辨的.针对该问题并基于三亚非相干散射雷达我们提出了一种解决方案,即月球正面南北半球拼接成像技术.该技术通过将波束指向调整到特定位置,对月球正面南北半球分开照射的方法进行两次独立的实验,最后将正面南北半球图像拼接的方法得到完整的月球成像图.实验结果证明该技术可以得到较为理想的图像,但仍然存在一些不足需要改进.

When ground-based radar and range-Doppler algorithm are used to image the nearside of the Moon,it is inevitable to encounter the problem of"north-south ambiguity".This is because when the range-Doppler ima-ging algorithm is used to image a rotating celestial body,the echoes of the two points conjugated at the apparent equator are superposed together and cannot be resolved in the range-Doppler image.We propose a solution to this problem based on the Sanya Incoherent Scatter Radar,namely the mosaic imaging technology of the northern and southern hemispheres of the near side of the Moon.In this technology,two independent experiments were carried out to separately illuminate the northern and southern hemispheres of the nearside of the Moon by adjusting the beam direction to a specific position.Finally,a complete Moon nearside map was obtained by combining the i-mages of the northern and southern hemispheres.The results of experiments show that this technique can success-fully get the Moon images,but there are still some defects that need to be improved.