A position detection system for locating an object including a magnetic field generator is disclosed. The position detection system also includes an array of parallel conductors responsive to a magnetic field generated by the magnetic field generator and a plurality of receivers each associated with a parallel conductor. The parallel conductors are spaced apart from one another by a substantially constant spacing. Each receiver has an associated gain, and the gains of the receivers are configured to simulate voltages induced in conductor loops of sinusoidally-varying pitch.

 
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> Passive distance measurement using spectral phase gradients

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