[piano music, LRO title] Narrator: NASA scientists routinely use lasers to track the

[鋼琴曲，LRO標題] 旁白：美國宇航局的科學家們經常使用脈衝光來追蹤人類的蹤跡。

position of the Lunar Reconnaissance Orbiter's laser altimeter as it orbits the moon.

月球偵察軌道器'的脈衝光測高儀繞月球運行時的位置。

Recently, however, they also tried something a little...different. In addition to tracking

不過最近，他們也嘗試了一些......不同的東西。除了追蹤

the instrument, they used the laser to send a picture of the famous Mona Lisa in the first demonstration

的儀器，他們用脈衝光發送了著名的蒙娜麗莎的圖片，在第一次演示中。

of laser communication with a satellite at the moon. To do this, the LRO team

與月球上的衛星進行脈衝光通信的技術。為此，LRO小組

used the existing laser tracking signal--sent by the Next Generation Satellite Laser

使用現有的脈衝光跟蹤信號--由下一代衛星激光器發送。

Ranging Station at NASA's Goddard Space Flight Center. The image was divided into pixels,

美國宇航局'的戈達德太空飛行中心的測距站。該影像被劃分為像素。

which were then sent to the spacecraft one at a time by re-timing the regular tracking pulses.

然後，通過重新安排常規跟蹤脈衝的時間，每次向航天器發送一個脈衝。

By delaying the tracking pulses by specific amounts, LRO scientists

通過將跟蹤脈衝延遲特定的時間，LRO的科學家。

could use the difference between the expected arrival time and the actual arrival time to indicate the brightness

可以用預計到達時間和實際到達時間的差值來表示亮度。

of an individual pixel. Once the image was sent, scientists corrected for

的單個像素。一旦影像被髮送，科學家們就會對其進行校正。

transmission errors caused by the Earth's atmosphere using common techniques used in CDs and

使用CD和CD中使用的常見技術，由地球大氣層引起的傳輸錯誤。

DVDs. They also studied signal fluctuations due to Earth's atmosphere.

DVDs。他們還研究了由於地球'大氣層引起的信號波動。

The final image was verified when it was returned to Earth using LRO's radio telemetry system.

最後的影像在使用LRO'的無線電遙測系統返回地球時得到了驗證。

This test--and the data obtained from it--sets the stage for future

這個測試--以及從中獲得的數據--為未來的發展奠定了基礎。

high data-rate laser communication demonstrations that will be a central feature of NASA's next

高數據率脈衝光通信演示，這將是美國宇航局下一步工作的核心特徵。

moon mission, the Lunar Atmosphere and Dust Environment Explorer. So, while

月球任務，月球大氣和塵埃環境探測器。所以，雖然

lasers are currently being used to track NASA satellites, in the future they may also be used to communicate

脈衝光目前正被用於跟蹤美國航天局的衛星，未來還可能被用於通信

with them, sending not only data, but perhaps images that one day wil be as famous as...

發送的不僅是數據，也許還有影像，有一天會像... ...

the Mona Lisa. [piano music, Mona Lisa image]

蒙娜麗莎。[鋼琴曲，蒙娜麗莎圖片]

[piano music, beeping, satellite flies by Earth]

[鋼琴音樂，嗶嗶聲，衛星飛過地球]

[piano music, beeping, Goddard Space Flight Center information]

[鋼琴音樂，嗶嗶聲，戈達德太空飛行中心資訊]

[piano music]

[鋼琴曲]

[piano music fades, black screen]

[鋼琴音樂消失，黑屏]