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Originally Posted by ivconic
Metalic item to be found at long distance, must have some unique feature that makes it much different from environment and at the same time need device capable to "recognize" that item only by that unique feature. It is hard to imagine device itself! Which technology to use? Radio? How to relate radio wave with any of metalic item features? IR? The same. NMR? Yes it could be done and already was done but with limitations and it is to expensive for our matters. EM field? Done and explored but not satisfactory, with huge limitations. Something else? Maybe.
But what is with environment? It is not empty space. It is composite substance.
How to cancel environment factor in process of LR locating/detecting?
How to acuratelly detect only "needle in hay stack" ?
Tough task.
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According to some long range locating theorists, environmental factors are necessary to support secondary effects of buried metal. One of these is the effect of a well known space charge in the lower atmosphere which causes electrons to move from the ground to molecules in the air and travel upward. Apparently these theorists expect to see a difference in some effect they claim they are measuring at a distance from the air where the metal is buried. From what they say, they don't want the environmental factor of atmospheric charge moving electrons up to be removed. If anything, they want it to be stronger.
But maybe they would want other environmental factors to be removed that add noise to some small measurements they try to read.
Best wishes,
J_P