Using distant quasars as beacons, the antenna positions are triangulated for measurements within a centimeter, sometimes even within millimeters.

 
       
  • 天線(xiàn)位置呈三角形,用遠處的這些類(lèi)星體做參考標志,測量誤差可為厘米量級,有時(shí)甚至為毫米。
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