SpaceX 得到 FCC 的同意架設家用的衛星網路

在「FCC approves SpaceX’s plans to fly internet-beaming satellites in a lower orbit」這邊看到的:

The Federal Communications Commission has approved SpaceX’s request to fly a large swath of its future internet-beaming satellites at a lower orbit than originally planned.

預定打四千顆低軌道衛星上去:

Under SpaceX’s original agreement with the commission, the company had permission to launch 4,425 Starlink satellites into orbits that ranged between 1,110 to 1,325 kilometers up. But then SpaceX decided it wanted to fly 1,584 of those satellites in different orbits, thanks to what it had learned from its first two test satellites, TinTin A and B. Instead of flying them at 1,150 kilometers, the company now wants to fly them much lower at 550 kilometers.

不知道價位會落在那個區塊... 如果價位夠低的話,也許是可以考慮當作偏鄉地區的通訊方案?至少是個備用方式...

如果你有衛星 (對,衛星),可以玩看看 AWS Ground Station

AWS 推出的新服務,AWS Ground Station:「AWS Ground Station – Ingest and Process Data from Orbiting Satellites」。

AWS 目前在地面上見了兩個基地站 (預定要成長到 12 個),這個服務可以跟衛星溝通:

Ground Stations – As I mentioned earlier, we are launching today with 2 ground stations, and will have a total of 12 in operation by 2019. We will monitor utilization and demand, and will build additional stations and antennas as needed.

收費是按照分鐘計算:

Pricing – Pricing is per-minute of downlink time, with an option to pre-pay for blocks of minutes.

看起來是給租用衛星頻寬的人用的... 不過當初會決定作這個服務是吸了什麼 XDDD

Galileo 系統啟用

由歐盟主導的 Galileo 系統宣布啟用,提供早期服務 (Early Operational Capability):「Galileo navigation satellite system goes live」。預定的 30 顆衛星已經打了 18 顆上去:

At this point, 18 of the planned 30 satellites are already in orbit.

在一般的使用下精確度可以到 4 公尺,相較於 GPS 是 15 公尺高出不少:

Using GPS, private users can navigate with a precision of up to 15 meters (m). Galileo offers a precision of up to 4m for its fully open service.

而商用與軍用可以到公分等級:

Commercial users and official government services can even receive a precision of a few centimeters. This is important, for example, for fully or partially automated planes, cars or ships.

之後應該會有同時支援兩套系統的設備出來... 手機應該也會有?

在 Boeing 787 上上網...

酷航有些飛機是 787 了,這台飛機有提供 Internet 上網功能 (WiFi HotSpot),一個小時是 USD$11.95,三個小時是 USD$16.95,二十四小時是 USD$24.95。

扣掉起降的時間,成田飛桃園差不多可以買三個小時的方案來用,服務是由 T-Mobile 提供:

看起來應該是走衛星線路,從德國落地後再連出來,快的時候可以到 1Mbps,慢的時候大約在 128Kbps,latency 大約是 1000ms,而 packet loss rate 其實不高,線路還蠻穩定的。

這次來回都有買,算是嘗鮮玩玩看,之後應該還是會在飛機上睡覺吧 XDDD

接收氣象衛星訊號

在「Listening to satellites for 30 dollars」這篇文章介紹了如何接受氣象衛星的訊號,並且轉成圖片...

關鍵的兩個軟體,一個是作者是先用 GQRX 收下來,然後用 WXtoImg 轉成圖片,這是作者抓下來的成果:(NOAA-15 的資訊)

如果在刻一些程式儘量全自動化,用 Raspberry Pi 丟到陽台收訊號轉換,好像是個不錯的方法?不知道衛星每天丟出來的量有多少...

捷藍 (JetBlue) 將透過衛星提供 WiFi 給機上乘客...

JetBlue 將會透過衛星轉接,提供機上乘客 WiFi 服務:「JetBlue Launches Satellite-Based Inflight Wi-Fi」。

原始報導「JetBlue launches high-speed wi-fi during flights」內有提到價位是 USD$9/hr:

The airline will also offer a live video streaming high-bandwidth plan called Fly-Fi Plus for applications like streaming movies. It costs $9 per hour.

hmmm...