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Originally posted by watchitburn
Navigation via Signals of Opportunity (NAVSOP)
In BAE’s system, everyday signals like TV, Wi-Fi, radio or cell phone are used to triangulate the location of a person or vehicle. NAVSOP gets the position exact within several feet with this signal-scavenging approach. It uses all sorts of other signals as well, from GPS satellite to air traffic control. The system can even learn and evolve by taking signals that were originally unidentified and using them to build increasingly reliable and more exact fixes on location.
This pretty freakin cool, also a little bit disturbing considering what else a system like this could lead to. Not to mention the main use it is going to be put to, namely UAV and missile guidance systems. Still, I can see uses for it in search and rescue operations.
Originally posted by ChuckNasty
Thought they used this system before the GPS Satellites were in place? Vor, TACAN, ILS, etc... Not to mention the old sextant.
I know some of the older USAF ACFT use the older systems along with GPS...true, I may be working on old as heck C-130's, but the old school stuff is just as good as the GPS stuff. (The Sextant is no longer required for C-130s and most acft have taken out Vor Requirements in training as well).
But your idea of using the old school techniques when a GPS signal is scrambled is a good one - don't think the current drones or new acft use anything other than GPS. A revisit to the old techniques for an 'ok' back-up is definitely needed.
I told the thread I personally talked to representitives of the cable, "satellite" and analog TV companies.
I asked them pointed questions and took my research from there.
Why would cell and GPS service ever be "spotty" if they are truly linked by satellites that "blanket" the Earth?
This does not surprise me that they would say that they can use "radio signals" instead.
Let's just say that if there were satellites above that relayed signals over the Earth your GPS should have worked.
But, since we know they rely on relay cell towers and you weren't near one that that would account for lack of signal.
Why do satellites in general when attached to homes face out instead of up?
Because they are using Earth bound relay systems.
If GPS were " satellite" based, why would the signal NEED to travel through mountains?
Mountains would only be a hindrance to ground based relay systems.
I, no longer believe this garbage. He would definitely be lacking since the GPS is really a ground based relay system that does not rely on the ridiculous need for a satellite to be say 28,000 miles above him.
Thereby negating pinpoint accuracy of say a triangulation.
If you are standing with a transponder in your backpack broadcasting a signal, how do you know if the signal
Or simply bounce off the ionosphere and return to Earth?
What determines this?
It shouldn't matter how much of the sky is blocked if a satellite system is in effect.
Your transponder signal would travel to a satellite which would denote where below that particular signal eminated from by coordinates of latitude and longtitude.
Rain blocking it? What about the Ionosphere which would lie between the signal relay?
That would seem to be a far greater stumbling block than mere rain.
Good heavens how effiecient a system could you develop that was thwarted by something as common as rain?
In any case, some of the satellites are alleged to be situated in the Exosphere.
How do you imagine those signals would be able to be maintained in a transit from Earth to
satellite and back again through the Ionoshere without completely being degenerated into useless
Oh right. Rain scatters the signal but you turn around and exclaim that we are still "receiving" them from Voyager.
If we are relying on satellites, why the need for the propagation of so many cell towers?
Originally posted by ChuckNasty
Old will outlast new - check out passive radar vs regular radar. The older stuff can detect the modern stealth acft. Passive IR detection or passive turbulence will defeat most current stealth acft/drones.