Comment by stereo
14 hours ago
Gps is free to use. Running your own gnss service requires an atomic clock and possibly separate transmission hardware, which is possible, but adds cost, volume, and weight.
According to [1], “[o]ne of the current generation of GPS satellites (Block III) weighs over 2,200 kg (4,850 lb), the weight of an average pickup truck. The body of these satellites are 1.8 m x 2.5 m x 3.4 m (5.9’ x 8.2’ x 11.2’) in size”. In comparison, “the current V2 Starlink satellite version weighs approximately 1,760 lbs (800 kilograms) at launch, almost three times heavier than the older generation satellites (weighing in at 573 lbs or 260 kg)” [2]
[1] https://novatel.com/an-introduction-to-gnss/basic-concepts/s... [2] https://www.space.com/spacex-starlink-satellites.html
> Gps is free to use. Running your own gnss service requires an atomic clock and possibly separate transmission hardware, which is possible, but adds cost, volume, and weight.
Thanks you provide some great insights on why starlink didnt use gps but still if starlink wants to focus itself as the uncensorable internet in places like protests etc. I feel like they can probably do this after this recent incident
I just can't feel but sad right now because starlink was still providing activists ways to report outside and that helped protestors a lot and information. Now even starlink got removed because starlink tried to save money and I think might not have thought about what if gps itself gets blocked.
This is giving very bad signals for Iran. Is there any way now that Protestors are able to communicate to the outside world/ activists be able to report data outside?
> if starlink wants to focus itself as the uncensorable internet in places like protests etc
I’m not sure Musk would actually want that though, especially these days.
Why not? Has Musk shut off Starlink? The reporting out of Ukraine was almost entirely wrong. https://en.wikipedia.org/wiki/Starlink_in_the_Russian-Ukrain...
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Why not?
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Yes, ask their Mossad direct and local handlers (as per Mike Pompeo [1]) about how things are going, I’m sure that this being Mossad they have a ground-based way to get the information out.
[1] https://xcancel.com/mikepompeo/status/2007180411638620659
Mike Pompeo is a private citizen; is there some reason to believe that he has direct knowledge of foreign involvement in these protests? It seems unlikely, and doubly so that he’d actually disclose it if he did.
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why stop there? maybe khamenei is a CIA asset made to create a caricature of an evil external enemy?
Chip scale atomic clocks are quite small[1], have been used in space, and could be part of the existing Starlink satellites. Finding reliable details about the orbital vehicles the internet eludes me.
[1] https://ww1.microchip.com/downloads/aemDocuments/documents/F...
GPS comparison is moot in this case, as there's no need for Starlink constellations to provide full GNSS capability, just locating the satellites precisely enough to facilitate beamforming.