4 ms·
Why ground? I'd do that as an L-band ORBCOMM type system, since it's going on planes operating over oceans. $0.01/character.
by rdl 13y ago
Why ground? I'd do that as an L-band ORBCOMM type system, since it's going on planes operating over oceans. $0.01/character.
- ars 13y agoSo why don't planes do that that? You need 24 bits for 3 meter GPS accuracy (times 2). Add some extra for altitude and airplane ID (or does a unique ID come built in?) So maybe 80 bits in total. This would be nothing for an airplane - $0.40 per hour? Why don't they do this already?
- userbinator 13y agoAnd since this plane is far larger than 3 meters, it doesn't even need to be that accurate; 50 meter GPS accuracy would be good enough.
- hueving 13y ago>This would be nothing for an airplane - $0.40 per hour? Why don't they do this already? They would likely receive pushback from private jets that don't want all of their flight path transmitted back to RR.
- ars 13y agoI don't know what RR is, but you don't have to transmit to any central authority. Just to the plane owner. Make a law that the owner has to preserve the data for one week, but doesn't have to provide it to anyone. And doesn't the US military track every overland flight anyway?
- jamessb 13y agoI believe that Rolls-Royce doesn't sell it's engines; it leases them instead. So engine telemetry data from many airlines is transmitted to the engine's owner, which happens to be a central organisation. (Of course, it is a business, rather than branch of a government, and not the only manufacturer of jet engines).
- epo 13y agoRolls Royce. Make a law affecting every nation on the planet? Best of luck wth that.
- ars 13y agoActually rules made by the FAA do pretty much affect every nation. Many nations do not have their own version of the FAA and just rely on the US. But it's even easier than that: Just make all US owned airlines require it, and any flight landing in the US. Phase it in, etc, to give time to upgrade, but it's certainly possible.
- zimpenfish 13y agoThere's a cost analysis of that by Stross in the comments. Basically "way too damned expensive - ~$M - for once-a-decade events".
- ars 13y agoCare to link to it? I didn't find anything by "Stross". My numbers were $0.40 per hour, plus a few hundred for the equipment (it's available off the shelf, don't need anything custom). Don't know how much installation would be, but certainly not millions.