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Cut a long slot in the road, add a single wire for the full length.
The idea would have a low power radio signal added to the wire.
Consept #1, A full length radio station that would never fade in and out. The signal could be in digital so no worry of same signal cross over.
Consept #2, Using
phone technology, add a second wire. Every second send a second signal in the oposite direction. The signal in the first wire would give information as to road name or whatever, The second signal could be timed against the second, measured for gap and you have GPS without the "S"
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Annotation:
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I believe that this would run into the same problem as the "Park here Flag" idea as you are forgetting cold weather. As mighty_cheese stated |
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//Depressions in the road surface cause water to collect. This water freezes and causes the road surface to crack. // |
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Sorry, it's hard to take someone seriously if they can't spell "concept." |
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Concept 1 - XM satellite radio does this much better and simpler and cheaper and all sorts of other superlatives. |
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I have no idea what your Concept 2 is supposed to accomplish. "You have GPS without the S"... you have global positioning? What does that mean? I am currently positioned on a globe. Does that mean I have GPS without the S? Again, doesn't GPS do this much better and simpler and cheaper and all sorts of other superlatives? |
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Blah. Your antenna "wire" would have to be as thick as a tree trunk to carry a signal the length of the highway. Then you'd need a very hefty amplifier to drive it. Then you'd need to address the problems of dispersion (different frequencies travel at different speeds down the wire) and scattering (wire laid down in sections causes reflections from every joint, to the point where the sum of all reflections is stronger than the signal). Then you need to figure out how to keep the iron gridwork of rebar in the road from mucking up the signal before the receiver gets it. |
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[waugsqueke] got it right. Ultra-wide-area radio and global positioning are both handled much better in a satellite-based system. |
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-- I'm no RF engineer so help me out with this "amplified by a cap" idea. Feel free to speak in more specific technical terms.
-- I always thought the "S" stood for "System".
-- As best I can recall, inductive reactance (the "choke" you refer to) does not occur only in coiled wire.
-- I'll skip the "few lines of code" thing for now.
-- Are there any groups out there performing music in DTMF bursts these days ? I'm guessing but, I suspect that the bandwidth requirements for the transmission you cite are a bit below the threshold for a pleasant listening experience on a car radio.
-- RG68 wire set at a 1000 feet from what ?
-- Hey, where'd these other antennas come from ? I thought this long wire thing was the antenna.
-- And what about ... oh never mind, I'm bored with this whole consept. And besides, I have a better idea about delivering fishbones. |
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