Teardown of the SpaceX Starlink User Terminal
arstechnica.com
arstechnica.com
https://www.reddit.com/r/Starlink/wiki/index#wiki_-_will_sta...
That links to two timestamps in a 47 minute livestream by Elon Musk. There's no canonical answer on starlink.com.... because that site has basically no info on it.
If Starlink had come out saying they wanted to provide access to everyone the telecos would have came in and said Starlink has to also allow reselling of access like how they're forced to (at least in Canada).
It is a lot easier to show up and just tell everyone, "Remember how rural areas aren't profitable for you? No worries, we'll take this trouble from you."
That's not actually the problem. The satellite footprint is >1000km across, and they can just launch more satellites to serve more customers. They would happily launch enough sats to serve every customer in the world if that was the only problem.
The issue is rather bandwidth density on the ground. Starlink achieves it's high system capacity by SDMA. That is, every antenna, both on the ground and on the satellites, is very highly directional, and they can have a single satellite talking to many customers on the ground at the same time on the same frequency, so long as the angles between each customer are large enough. The ground antennas are, for cost and physical size reasons, less capable of distinguishing between different directions than the satellite antennas, and can only do so if the angle between the transmission origins is ~>10°. This means that any location on the ground (iirc with a spot size of ~10km or so) can only handle a few dozen simultaneous beams, no matter how many satellites you have up there.
From what I've read, they had a lot more people sign up for beta testing than they needed, so some people just didn't get the invite.
https://www.satsig.net/latency.htm
You have to move the satellites closer to Earth to reduce latency - hence low earth orbit (LEO). You can achieve much better latencies, <20ms, and support modern networking applications.
https://arstechnica.com/information-technology/2020/03/musk-...
But when you reduce the height to LEO, not only are the satellites no longer geostationary, they also have a much smaller coverage area. So you need more satellites to cover the same area, and fancy networking to handle the constant hand-off between satellites.
I wouldn't characterize this as a function of having more satellites, but rather having fewer users per satellite (an admittedly subtle difference). But, related to the above post(s), the smaller geographical area each satellite covers is a problem for coverage (you need more satellites in orbit), but is a benefit for speed -- you have less users vying for the full bandwidth of the satellite.
And, because the geographical areas are smaller, instead of having one base station/uplink, you now have geographically distributed base stations, so you have multiple points to access the Internet. This also helps with bandwidth (instead of X total uplink capacity, you need X/n capacity for each site, where n is the number of sites).
Once you get around the logistics of managing a fleet of satellites, many, many benefits flow from having lower orbits.
Starlink orbit: 550km
Geosynchronous orbit: 35,786km
Earth's circumference: 40,075km
Geosynchronous orbits are quite a way out. Latency at terrestrial distances can be painful already, bouncing through geosynchronous satellites will be multiples worse at a minimum. Meanwhile, Starlink's are at "normal" distances for networking - you probably connect to things further away all the time already.Have heard (IIRC in https://theamphour.com/518-satellites-and-evs-with-joris-aer...) that this could have been part of the reason for Starlink's decision to have their satellites in a lower orbit.
The subsidy angle is also of course a familiar playbook across SolarCity/Tesla/SpaceX etc.
I'd also imagine that they need a TON of subscribers to make it profitable. However by commoditizing their satellites the marginal cost of improving coverage is low (compared to GEO where every satellite is a billion dollar bespoke system).
Phased array antennas have been around for a while but I wouldn't be surprised if the starlink terminal is the first consumer device to actually use them (other than maybe boat radars?). They're still pretty expensive.
This is where I get a bit suspicious of the whole thing, as the areas where this service makes the most sense for a consumer is sparsely populated rural areas. I don't see how the economics works out.
Putting tin hat
The low orbit large non-stationary constellation of Starlink makes harder for other countries to deny service by attacking the satellites.
Also, the sensor fusion from modern jets need a point to point (to avoid possible compromised infrastructure), high bandwidth low latency communication. Starlink seems a great fit.
This is only based on what we know the system is capable of. Going on the realm of speculation, it is not difficult to imagine how a system, at low altitude, that cover the whole planet, can be used to eavesdrop communication from other countries.
Also, the satellites are made to have a right turnover, they can be always updated with the latest technology.
Lets not forget that the Arecibo Observatory (that collapsed this week) was made to listen for russian radio waves reflected from the moon. Maybe Starlink is the Arecibo 2.0
In summary, I think the Starlink is a military project subsided with paying customer. I wasn't made to make profit, it was made to make SpaceX a viable company in the long run.
The opposite is more likely, they were profitable already for years and then the made re-usability happen and their margin should be huge. They have not really lowered the price since they introduced re-usability.
Now the obvious idea is to put the satellites much closer to Earth, in that case they're rapidly moving across the surface and you need thousands/hundreds of them for full coverage, depending on the altitude the satellites are at. This wasn't really feasible until you had a rocket and satellite manufacturing designed for dumping large quantities of satellites into orbit at a time.
A hundred-dollar bill is lying on the ground. An economist and an engineer walk past it. The economist nods at it and opines: "I thought I saw something over there, but I must've imagined it. If there had been $100 on the ground, someone would've taken it by now."
The engineer picks it up.
So low earth orbit it is, but that meant doing several technology breakthroughs never seen before and at massive consumer scale.
First, you need to have massive launch capacity, otherwise satellites wouldn't be in view for most of the world, most of the time.
At this ground relative speed, they also stay in view pretty short at that speed, so you need to continuously roam from one satellite to the next every few minutes, hence the need for the cutting edge antenna array.
Lastly you need a truckload of satellites. Even the largest fleets are small series productions with specialized, expensive equipment such as radiation hardened processors, flywheels and propulsion to keep in orbit. Mass producing these from commercially available hardware was the third large challenge here.
Most companies would go bankrupt just tackling one of these and Starlink pulled them off in parallel. Pretty wicked.
Phased array antennas are necessary for this to work (no tracking of the low satellites necessary), because one wants to have the satellites in very low orbits to achieve low latency. Geosynchronous satellites are very far away from earth so that speed of light gives unacceptable delays for things like gaming, chats, remote server admin, etc. Very low orbit can get short pings (in theory better than fiber because light moves faster in a vacuum than in glass). But very low orbit means one needs a lot of satellites to have wide coverage and no dropped connections. They are thinking around 12,000 in the first phase and around 42,000 in the second phase. Having so many satellites also gives the system much higher bandwidth as each satellite is limited in data transfer rates.
Plus SpaceX is looking for a cash cow to fund their ultimate goal: a cheap, extensive Mars transportation system to facilitate building a city on Mars.
I don't believe SpaceX numbers and BFR (it will always be BFR for me) is still a paper rocket (Raptor looks good though). But it is still cheap compared to traditional launches.
The problem is: SpaceX has now plenty of cheap, reusable Falcon 9s but not a lot of stuff to launch. There are not that many companies who want to build and launch satellites: it is expensive no matter what and the cost has to be justified. Falcon 9 rockets (including heavy) are also limited in capability: small fairing space and not the most efficient beyond LEO. Also, it may not be suitable for some sensitive payloads (military, etc...).
Ii means that SpaceX has good rockets, they already have the "culture and skills for rapid relaunch" but not enough market for it. So they did the obvious thing: create their own.
As for BFR. I made the choice not to take SpaceX communication into account, it is worthless. Same thing with everything by Elon Musk. I only believe what they show, which is already impressive enough.
There is no downward pressure on pricing because spacex only has to be slightly cheaper than the cheapest non-reusable rocket. So for a marginal cost of, let’s say, $2m for a reflown booster, there are still able to charge $50m+.
But since their customers are seeing prices of $50m, space is still expensive... nothing much has changed.
(I’ve simplified this by omitting the fact that the upper stage is not reusable)
A lot of BFR development is being done in the open in Boca Chica, and you can follow along because it’s being live-streamed almost 24/7. BFR has had small incremental hops recently and will try for a 15km flight this week. We’ll see what happens.
Elon Musk has said he would love some competition because it helps increase the pace of progress. He even tried that internally for a bit by developing StarShip in two locations for awhile. I heard him in an interview saying that SpaceX might have too many great engineers and that it would be better for his goal of a city on Mars to have them spread over many companies.
> small fairing space and
Its not actually small. Its a little smaller then the biggest that you could launch on Delta 4 (that you can't buy) or a New Glenn (that you can't buy), but to just say its 'small' is just not accurate. Essentially its size is big enough for 99% of payloads.
There are like a few military sats in the next 5 years that need a slightly bigger fairing and they will have that for those launches.
> not the most efficient beyond LEO
By what definition? Just because it doesn't use hydrogen doesn't mean its not the suitable for beyond LEO. There is a reason the alternative for SLS is Falcon Heavy and not anything else.
> Also, it may not be suitable for some sensitive payloads (military, etc...).
That is just false. Falcon rockets are fully qualified for all military orbits and payloads.
The only thing they can't do right now is vertical assembly and that will be built by the time they have the first contract.
That is the US military. Think drones and all the fancy battle space information management stuff they’ve been talking about forever.
I don’t see how this gets built without the US mil wanting to use it. Furthermore I don’t see how this was designed without their input. It’s entirely possible that the US govt is covertly funding Starlink.
There's also a caveat: currently a satellite should have a ground station in view to relay data. It is rarely the case in areas of military activity.
Still though, phased arrays aren't all that complicated conceptually. The little chips are probably TX/RX switches and the larger chips probably do block up/downconversion, mixing, and provide controllable phase delay.
It is the overall integration and combining of 600+ signals that is the real impressive part. ST Microelectronics deserves as much credit on this as anybody. Truly stunning.
I'm excited to hear he's getting a crack at this and I can't wait for that video to drop.
Edit: An no reason we can't stick GPUs on an airplane, they aren't heavy.
[1] Not that Starlink wouldn't suffice in practice, but I assume Starlink probably won't want to cater to those customers with fancy, bespoke contract terms.
[2] And perhaps simpler equipment and maintenance in terms of fleet commonality. AFAIU, currently domestic service is via cellular and international service, where it's provided, is via satellite.
Yes you have to teether with your phone, but when 10GB only cost like $6 USD, you can make it work.
It'd be a pretty big DIY project, and quite possibly unable to be done due to physics of the dish preventing you from shifting over to the legal (Ham licensed) frequency.
It's not on-face illegal to build radio equipment though.
There is a long tradition of radio amateurs re-purposing other radio hardware. CB radios can often be retuned into the 10 meter band, wifi transceivers can work inside the 13cm band, for example.
Good luck doing anything other than the intended use with that.
Reports say ~$2000 each https://www.reddit.com/r/Starlink/comments/iuvqdq/starlink_t...
But this feels like more of a finger in the air guess
Competitors are going to do these teardowns privately anyway. In the case of starlink, it seems like there'd be nothing to gain and a lot to lose by being litigious when there are hoards of tech-enthusiasts which will devour content like this. It's free marketing.
I'm a big fan of Elon Musk, but I would have trouble denying that this line could be a chapter heading in any biography on hum and it wouldn't surprise anybody.
StarLink is underrated. Where I live, it's $100 a month for 100Mbps Fiber to the Home (it was $200 last month) if you can actually get in touch with the "National" telco, which has a monopoly on FTTH, xDSL. The other operators offer "4G", which goes to 10Mbps at 3 or 4 in the morning. It's also capped as you can only download with "high-speed" about 1GB before it's throttled.
Mostly, though, it's a few kilobytes per second. We lost millions of euros in business because of that, couldn't make video calls with physicians when we needed it the most for extremely urgent situations [tried 8 devices simultaneously with three different networks to get that to work and it did not work]. We bought about six 4G devices (routers, dongles). We bought a 4G antenna. Main xDSL provider took a year to bring us a line. For businesses, it's $300/month for 20Mbps. (Yes, that's 20 mega bits not bytes per second).
There were other providers, but they were shut down by the "regulators" because they were too popular.
Seriously, fuck them. Let StarLink shatter these assholes. It's taking too long.
If there's anyone from StarLink here, I'd like to get some of these babies.
I love the idea of Starlink but it wouldn't make any sense for me here.
I'm in NYC paying $65 a month 500 Mbps (up and down), with no contract, 2 year price lock-in.
For $75 my provider offers Gigabit with a lifetime price lock-in, I just don't have a use for it since I'm not big on streaming.
In Raleigh, NC I was paying $75 for 500 Mbps, same deal on no contract
The exception to that seems to be where fiber is available, but a lot of the US, even in areas where the population density is similar to Europe, don't have fiber available.
If anything the answer is, no it's not (see: places I mentioned)
But realistically it's a poor question.
They sent a 4G LTE modem. I'm getting 5-24 Mbps down, 10-40Mbps up, and 40-60ms ping. It varies quite a bit and, surprisingly, upload is consistently much faster than download. You need to experiment where to put the modem -- 8 feet can make a 10Mpbs difference.
The bandwidth seems acceptable for my in-the-sticks area but the latency is noticeable on conference calls. Not sure I'll keep it.
I will probably buy many StarLink terminals to put in several places, offer to family and friends, and, frankly, out of spite.
https://www.speedtest.net/global-index
Two positions from the bottom. It's faster to start from the bottom. Although if you're on mobile, you won't see the ranking for fixed broadband. It's only better than Yemen and Turkmenistan. It has worse fixed broadband and mobile broadband than fucking war zones. How is that even possible, even if you make efforts to make it possible?
The person you replied to isn't in the USA.
That said, broadband costs are inversely correlated with population density, more or less. In most (but not all) US cities fast, reliable broadband is easy to come by. Obviously you can find one-off complaints here and there from people who have exceptions, but the general situation isn't as dire as the edge cases.
> I have a 350mb/15mb connection for £50($66)
For comparison, I have 1000Mbps for about the same price in a medium sized US city. I have friends in other US cities who pay more than you for less bandwidth, though. It just depends on the location.
> In the UK...
The challenge with the USA is that we have a lot of land, some of which is very sparsely populated. We have 10 different states that each have more land area than the entire UK. For example, Texas is almost 3 times the size of the UK, but has half the population. It's a challenge to get high speed infrastructure everywhere, and another challenge to keep it updated every decade as speeds advance.
That's where Starlink shines: The sparsely populated areas where running high speed infrastructure to everyone is prohibitively expensive.
I also move between three or four places and I want consistency. The extreme case I talked about was in the mountains. However, the coverage was good, but the "internet" sucked. It is this that's infuriating. You never know. Sometimes, you have 30Mbps on mobile, sometimes you have 120kbps. If there's no consistency, you can't forecast. You can't rely on something like that.
The operations part also sucks. So, given the unreliability and the inability to be consistent, I'll just sprinkle places with StarLink terminals and have one thing fewer to think about.
Ya, try being in Canada. Take those problems and multiply them by 10. Then look at the Starlink satellite inclinations. The first 1400, the bulk of the system, won't even get to where I am standing at the minute (54* latitude). Starlink targets at very specific markets. It is not the globe-spanning uber-ISP that many think it to be.
After that, later satellites will be at 70 and 97.6 (retrograde) inclination, so the entire world should be covered upon completion.
The difference mostly comes down to corruption as the US government heavily subsidized network deployments, but without any requirement they actually build networks. Add a lot of anticompetitive legislation in the US and things really slowed down. It’s slowly gotten better over time, but many areas still have terrible internet availability.
PS: I pay ~66$ per month for 20/20 and live in a 22 story building so density isn’t the issue.
But if you wanted to go up to the mountains or the beach or any part of the country that wasn't an overcrowded city, you'd get spotty internet, certainly nothing to run a business on.
Can’t wait for starlink to come in and destroy them. I’ll sign up the second it becomes available.
) However: never say never!
That is why basic telecommunication infrastructure should be built out by the government, similar to roads, sewers/drinking water/gas pipes and postal service. Letting private companies do the job without mandating equal service will always lead to rural areas being dropped off the radar, and besides it's an enormous waste of resources if two or more service providers have to dig up half the country to bury infrastructure.
It only has to compete with in-ground Internet providers that don't provide internet in-ground. There are a lot of them.
StarLink will do for the Internet what satellite dishes did for TV and radio in many, many parts of the world that only had access to government controlled broadcasts. Satellite dishes allowed these people to have access to other cultures and become aware of things their governments were hiding from them.
The reason I say StarLink is underrated is that SpaceX is a U.S. company providing internet from space. Pretty hard for a government body, or a government, to control this. Even if they try, there definitely will be a black market for the receivers and people will get them where they need them. There will be customs agent who will take a bribe from someone importing them illegally.
That's without even addressing the fact that some governments spy on their citizens and arrest them. Granted, nothing guarantees that a StarLink customer won't have U.S. intelligence deep packet inspect the heck of their traffic, but the bigger threat for these people is their own government, and serious jail time for nothing. The lesser of two evils will play a role in adoption.
I would expect that, on the contrary, the U.S. would very much want to get as many citizens of a nation of interest as possible on a network they have some control over.
On the one hand, more people chatting leads to more insight. On the other hand, more people chatting creates noise that allows to hide people exfiltrating "interesting information".
On the more "businessy" side of things, Facebook and Google have been trying to enter China for quite some time. Google has through Dragonfly until there was a leak, and it announced shutting it down last year.
The problem in my opinion is that, to get those few billion people on the internet meant that these corporations had to deal with the Chinese government and "compromise their morals". If getting these people on the network is done through customer-premises equipment, it can be useful. It may prove harder to control the flow of devices than it is to control a corporation.
Facebook may as well become an important SpaceX customer. They tried to increase penetration with internet.org and deals with major telecom companies. Both have tried with balloons and drones. StarLink is a new mode (well, not entirely new, but one that has become more affordable).
It may create tensions between China and the U.S., and the former may restrict imports of these devices, but they'll find their way. It could also give leverage to the U.S.:"you want us to restrict your citizens' access to StarLink, give us something".
Who knows.
That said I don't really expect SpaceX to subsidize his research with a free replacement.
Lots of this depends on the RF architecture of the board though. The device clearly has high bandwidth but we have no idea what the tuning range is or if those subassemblies can be operated independently to build multiple beams. Also it is very high frequency (12GHz+) and uses circularly polarized antennas which may limit utility with existing terrestrial RF infrastructure.
In the Starlink Engineers AMA on reddit the team said they're working on reducing the power requirements. My current vehicle has 200W of solar, but a 100W draw would be a lot.
100 watts? Is that for real??
The Power over Ethernet injector supplies 56V/1.6A 2x power (namely all 8 lines energized).
See: https://imgur.com/JpVZ6Uy
Output 1 is for the dish, output 2 is for the router.
I actually submitted it some time before, but evidently the original title and a direct link to youtube weren't as appealing to HN readership.
UPD: If it isn't obvious, I was making a comment about the effects of the original title policy. If the original title is confusing / unappealing, the submission wouldn't be noticed, but someone's "repost article" with a better title would.