81–90 of 92 posts
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m is standard for meters mi is standard for miles -- Good ask.
"Ask" is bad enough as a synonym for "request." I really hope we can avoid "ask" also becoming accepted as a synonym for "question."
Can someone ELI5 how this would cause GPS errors?
Even plainer language: Rocket exhaust can have impact with atmosphere, we need to study it more on short and long term effects.
The ionosphere is not the same thing as the atmosphere. The ionosphere is a shell of super hot gas outside of the atmosphere.
I'm taking the liberty of reworking their "plain language summary." I aimed for maintaining accuracy with relaxed precision, but please correct me if I've lost too much of either in the process. I corrected a specific bit of imprecision in language in the source's plaintext summary not clearly distinguishing between vertical/y v. vertical/z, something the technical abstract clarified by stating "vertical altitude." -…
This would not be noticeable at all on a standard GNSS like the one in your phone.
Survey receivers use (at least) two frequencies which allows a simple calculation to determine pretty much exactly the delay due to the ionosphere, so they aren't affected by this at all.
This is an interesting anomaly, but GNSS is built to cope with this under normal usage, so it's inconsequential as far as I can tell.
If anyone has time and wants to see for yourself, 'CORS' - continuously operating reference stations, are available all over the place around where this happened, and the raw receiver data is freely available. You can download it and because you know the exact position of each receiver, you will be able to see the exact impact of this event at which ever location you would like to analyze.
Various open source tools are out there to process the data such as gLab and RTKLIB.
If anyone has the time to give it a crack and needs a hand or guidance feel free to ping me here.
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Military GPS devices have access to more frequencies and channels that consumer devices don't have. These frequencies use anti-jamming techniques (frequency hopping using pseudo-random patterns, etc). They also have much better accuracy available to them than the consumer devices. Typical dumb jamming systems aren't really going to do much against military anti-jamming techniques and if it really is hurting comms the…
Do you have a source for the better accuracy claim? I know they turned off Selective Availability ( https://en.m.wikipedia.org/wiki/Error_analysis_for_the_Globa... ) in 2000, so not sure if it's been true since then. From what I was reading, it seems like semi-codeless approaches to the P(y) (aka military) signal offer approximately similar accuracy to actually being in possession of the key. Furthermore, the P(y) si…
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Where have you ever seen 'm' used for miles? Wherever that is, go there and scribble it out! Also tell off the person who wrote it.
It's used that way on highway signs in England, where it's very confusing.
Even plainer language: Rocket exhaust can have impact with atmosphere, we need to study it more on short and long term effects.