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Elon Musk tweets using SpaceX’s Starlink satellite internet

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Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#101

Post by mrtksn »

ctdonath wrote: post #98
mrtksn wrote: post #96

Earlier quoted context omitted.

I checked it out, it says each satellite covers area with 550km diameter on the land. That's about a few countries at a time and possibly deep penetration into the larger ones. They will have to turn off the sattelites over Austria to prevent connections in Turkey.

1.5km vs 550km is not necessarily mutually exclusive when using phased array antenna: the beam may be 1.5km wide, but it may be steered across a 550km area. Ergo sat could service both Austria and Turkey, without blurring - it knows which country it's "pointing" at during any millisecond, so could service each without legal conflicts.

Can you provide a source for the 1.5km beam claim?

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#102

Post by Tuna-Fish »

mrtksn wrote: post #101
ctdonath wrote: post #98

Earlier quoted context omitted.

1.5km vs 550km is not necessarily mutually exclusive when using phased array antenna: the beam may be 1.5km wide, but it may be steered across a 550km area. Ergo sat could service both Austria and Turkey, without blurring - it knows which country it's "pointing" at during any millisecond, so could service each without legal conflicts.

Can you provide a source for the 1.5km beam claim?

I was actually wrong. The spot size is 1.5 degrees, or ~10km.

The source is the original Starlink FCC filing: https://cdn3.vox-cdn.com/uploads/chorus_asset/file/8174403/S...

But the point remains: The Starlink satellites do not just radiate omnidirectionally. Nor could they; the system is intended to eventually serve a meaningful fraction of the entire population on earth. This is not possible on non-steered RF. The only reason their plan has any sense is that every transmitter and receiver is directional, allowing efficient SDMA, where the same frequency can be used by multiple people simultaneously to communicate withe the same satellite, because the satellite can discriminate between their signals by the direction from which they were received.

Because of this, in order for Starlink to be able to communicate with you, it has to have a pretty good idea of where you are.

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#103

Post by sebringj »

z3ncyberpunk wrote: post #84
sebringj wrote: post #66

This is an amazing time to be alive. Starlink opens up bandwidth potential and global service reliability to bring completely new business models and capabilities. There is no more edge for trading on fiber under the ocean wires either (It seems so to me at least).

How about new potentials for humanity, I don't give a damn how it helps businesses or helps Wall Street crooks.

new business models != corporate crooks maybe ar greeters from uganda?

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#105

Post by mrtksn »

Tuna-Fish wrote: post #102
mrtksn wrote: post #101

Earlier quoted context omitted.

Can you provide a source for the 1.5km beam claim?

I was actually wrong. The spot size is 1.5 degrees, or ~10km. The source is the original Starlink FCC filing: https://cdn3.vox-cdn.com/uploads/chorus_asset/file/8174403/S... But the point remains: The Starlink satellites do not just radiate omnidirectionally. Nor could they; the system is intended to eventually serve a meaningful fraction of the entire population on earth. This is not possible on non-steered RF. The…

Can you quote the information? I couldn't find this in the document. I am sceptical that they can have that narrow beams and track the users(as the sattelite passes over them) from non-geostationary low earth orbit satellites. I would like to investigate this.

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#107

Post by manicdee »

JulianMorrison wrote: post #23
jb775 wrote: post #19

Earlier quoted context omitted.

I wonder how the Starlink latency compares to the current microwave technologies used by high frequency trading firms. Any slight latency improvement is a game-changer in the HFT industry.

IIRC this is how they plan to finance it.

I don’t recall SpaceX explicitly stating who they expect their customers to be, but fans quickly dredged up currency and remote stock trading as one potential major source of funding (single customers with huge budgets, rather than hundreds of homes on the cheapest plan)

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#108

Post by travisporter »

jniedrauer wrote: post #5

I'm really excited about this technology for selfish reasons. I love disconnecting and spending time in remote wildernesses. But paradoxically, being disconnected from technology gives me a lot of anxiety about technology. Working on devops roles over the last decade, I've almost never had a time when I can just forget about it all. Even when I'm not on call, and no matter how well I try to document things, I'm often…

My gripe is that the wilderness will now be less magical at night with these satellites near the stars though.

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#109

Post by Tuna-Fish »

mrtksn wrote: post #105
Tuna-Fish wrote: post #102

Earlier quoted context omitted.

I was actually wrong. The spot size is 1.5 degrees, or ~10km. The source is the original Starlink FCC filing: https://cdn3.vox-cdn.com/uploads/chorus_asset/file/8174403/S... But the point remains: The Starlink satellites do not just radiate omnidirectionally. Nor could they; the system is intended to eventually serve a meaningful fraction of the entire population on earth. This is not possible on non-steered RF. The…

Can you quote the information? I couldn't find this in the document. I am sceptical that they can have that narrow beams and track the users(as the sattelite passes over them) from non-geostationary low earth orbit satellites. I would like to investigate this.

From A2: overall description:

> Advanced phased array beam-forming and digital processing technologies within the satellite payload give the system the ability to make highly efficient use of Ku- and Ka-band spectrum resources and the flexibility to share that spectrum with other licensed users. User terminals operating with the SpaceX System will use similar phased array technologies to allow for highly directive, steered antenna beams that track the system’s low-Earth orbit satellites. Gateway earth stations also apply advanced phased array technologies to generate high-gain steered beams to communicate with multiple NGSO satellites from a single gateway site.

Details of the downlink beams is found at A3:

> All Ku-band downlink spot beams on each SpaceX satellite are independently steerable over the full field of view of the Earth.

Just read the entire A3.1 for more details.

Re: Elon Musk tweets using SpaceX’s Starlink satellite internet

#110

Post by JulianMorrison »

XJ6 wrote: post #53
JulianMorrison wrote: post #23

Earlier quoted context omitted.

IIRC this is how they plan to finance it.

You just made that up.

Why yes I make random shit up about how people plan to finance their low latency satellite constellations allla damn time. Ya got me. It's a fair cop guv.
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