The GPS satellites aren't receiving anything. The GPS satellites transmit signals, and the starlink terminals (and other users of GPS) receive those signals.
This is a great plot for a B movie or a trashy military action book. “The bad guys are jamming GPS uplink and we only have two weeks until the almanacs are out of date and the whole system breaks down. Millions of innocent Americans will drive into rivers by accident.”
More to the point, to do that to this number of satellites on this big an area you'd need nuclear power plant levels of power, and it would only degrade GPS a bit (their clocks slowly desync when uplink is blocked)
My understanding was that each satellite broadcasts a coarse ephemeris for the whole network, and that that “almanac” isn’t accurate for very long (on the order of weeks). Without uploads to the satellites, those almanacs will go stale.
I don’t think the almanacs are necessary for the system to work, in theory. But I believe they’re commonly used by receivers to narrow down the range of possibilities when trying to find a PRN match for a signal they’re getting.
(I’ve dealt with GPS and similar navigation signals for work but am not an expert, this is just the impression I’ve gotten over a few years)
Ok they said the GPS of the starlink satellites is being jammed, and the question was how. The comment I was replying to did not say the terminal, it said the satellite. Maybe that's the confusion
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It always strikes me that the best place of information for a cloud provider is not from that provider but a third party website. This is not a good comment for the cloud provider.
We actually recently made the decision to staff someone full time on the site just to maintain it for the community. Even the JSON file for the site gets hit hundreds of thousands of times per day...feels like it's become kind of the de-facto source of truth in the community for where to get reliable AWS pricing information and I believe its powering a pretty remarkable amount of downstream applications with how much usage its getting.
We acquired the site almost 5 years ago and want to continue to improve it for the community. If you have any cloud cost management needs, we're also able to help for our main business here: https://www.vantage.sh/
Thry have to adhere to their marketing words and numbers like "efficiency increase of 99999% in performance per dollar per token per watt per U-235 atom used"
We want parents to make decisions about these things as much as possible. I don't have an issue with my kids getting details on human anatomy, as long as it's not pornography. But everybody is different.
You're assuming the "legacy" system is being replaced by a new one, which isn't the scenario being described in the link or the book. They cover approaches for continuing to safely evolve the legacy (i.e. untested) system.
Rewriting the legacy system is one of the valid paths to maintain it. There can be multiple reasons to do that like operational risk which cannot be mitigated, maintenance overhead, risk related to the existing dependencies of the system.
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