Tuesday, February 26, 2019

The satellite phone in your pocket

This reminds me of my greatest pet James Bond peeve - the stupid "you need a gigantic antenna to contact your killer satellite" ending of Goldeneye

Mind you, this is almost as hard to believe: 
Last month I wrote about Ubiquitilink, which promised, through undisclosed means, it was on the verge of providing a sort of global satellite-based roaming service. But how, I asked? (Wait, they told me.) Turns out our phones are capable of a lot more than we think: they can reach satellites acting as cell towers in orbit just fine, and the company just proved it.

Utilizing a constellation of satellites in low Earth orbit, Ubiquitilink claimed during a briefing at Mobile World Congress in Barcelona that pretty much any phone from the last decade should be able to text and do other low-bandwidth tasks from anywhere, even in the middle of the ocean or deep in the Himalayas. Literally (though eventually) anywhere and any time.

Surely not, I hear you saying. My phone, that can barely get a signal on some blocks of my neighborhood, or in that one corner of the living room, can’t possibly send and receive data from space… can it?

“That’s the great thing — everybody’s instinct indicates that’s the case,” said Ubiquitilink founder Charles Miller. “But if you look at the fundamentals of the RF [radio frequency] link, it’s easier than you think.”

The issue, he explained, isn’t really that the phone lacks power. The limits of reception and wireless networks are defined much more by architecture and geology than plain physics. When an RF transmitter, even a small one, has a clear shot straight up, it can travel very far indeed.
 OK, it's not exactly that you'll be speaking to Mum via satellite - continue reading the article for more details of what the system will be good for - but I'm still very impressed that my mobile phone can (in theory, and maybe soon in practice) hook up directly with a passing satellite.

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