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Starlink 的雷射傳輸細節

 7 months ago
source link: https://blog.gslin.org/archives/2024/02/02/11632/starlink-%e7%9a%84%e9%9b%b7%e5%b0%84%e5%82%b3%e8%bc%b8%e7%b4%b0%e7%af%80/
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Starlink 的雷射傳輸細節

在「Starlink's laser system is beaming 42 petabytes of data per day (pcmag.com)」這邊看到 Starlink 的雷射資訊,原文是「Starlink's Laser System Is Beaming 42 Million GB of Data Per Day」。

主要是這兩張圖的資訊:

1706867290-25277f1f.png
1706867309-6e81bc5f.png

文字與圖片有很多不一致的地方,所以先抓個概念就好... 目前看起來是個「可商用」的階段了,而上面提到的 5400km 光是真空單向傳輸就要 18ms latency,如果擺到地球上的話,台灣到澳洲中間差不多?到關島、北海道或是新加坡都差不多在 3000km 左右。

想像中,海洋上面的 client 應該會透過這個方式 relay 到附近的陸地...

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NASA 用雷射光傳送「蒙娜麗莎」圖片到月球上...

NASA 用雷射光將灰階「蒙娜麗莎」傳送到月球軌道上的 LOLA (Lunar Orbiter Laser Altimeter,看起來是台描繪地表用的儀器?):「NASA Beams Mona Lisa to Lunar Reconnaissance Orbiter at the Moon」。 傳輸速度是 300bits/sec (這數字讓人真感動 XD),傳送 152x200 的 4096 灰階圖片。這次測試其中一個目的是了解地球大氣層對光訊號的影響,可以看到左邊的 raw data 與右邊靠 2/3 RS code 修正的結果: 不過好像沒提到用多大台的雷射打到月球上... (雷射砲?)

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Starlink 的天線在五十度時會過熱停機

也是在 Hacker News 首頁上看到的資訊,Starlink 的天線在五十度時會停機:「Starlink dishes go into “thermal shutdown” once they hit 122° Fahrenheit」。 這篇報導是出自 Reddit 上的消息,苦主住在亞利桑那州,美國的南部地區,以緯度來說的話大概跟大阪差不多:「This could be a problem. Only noon in AZ...」。 Reddit 的討論裡面有提到用撒水的方式降溫,但這樣對熱帶與亞熱帶地區好像不太友善啊,陽光大一點應該就會過熱?看起來是個得改善的點了...

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Starlink 北美北部封測

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a611ee8db44c8d03a20edf0bf5a71d80?s=49&d=identicon&r=gAuthor Gea-Suan LinPosted on February 2, 2024Categories Computer, Hardware, Murmuring, NetworkTags beam, laser, starlink, system

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