Lockheed Martin Dark Ice: a quantum magnetometer geopositioning system

Re:Lockheed Martin Dark Ice: a quantum magnetometer geoposit... by tantony on Wednesday October 25, 2023 @02:19PM (#38016263)

Magnetic field drops off by an inverse-cubed law (as opposed to inverse-squared for RF). So it would be a lot more impractical to cover large volumes.

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Re:Lockheed Martin Dark Ice: a quantum magnetometer geoposit... by tomsto on Wednesday October 25, 2023 @02:25PM (#38016343)

Thanks. I would still be curious to know how the strength of an artificial magnetic field at a range of say 10 km compares to the order of magnitude of local variations they are talking about in the earth’s magnetic field.

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Re:Lockheed Martin Dark Ice: a quantum magnetometer geoposit... by oldbbsnickname on Wednesday October 25, 2023 @05:58PM (#38018919)

Make some assumptions, find the relevant equations, and plug in the numbers.

https://en.wikipedia.org/wiki/Magnetic_field

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Re:Lockheed Martin Dark Ice: a quantum magnetometer geoposit... by eternityforest on Thursday October 26, 2023 @01:38AM (#38022017)

IIRC I think there was a telephone system with giant magnetic coils that went a quarter mile, but maybe I read a blog wrong or something.

In any case it wouldn't be as portable and would make you rather easy to detect I would imagine, if you wanted to cover a large area.

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