The above radar image was taken two days ago by the Deep Space Network radio telescope in Goldstone, California, USA.
上面的雷达影像在两天前，由位于美国加利福尼亚金石的深空网络雷达望远镜拍摄的。
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Abstract: in this article a new laser-radar ranging equation is deduced. This equation takes into consideration the tracking jitter of a telescope and the beam jitter caused by atmosphere turbulence.