| CPC G01V 3/12 (2013.01) [H01Q 1/36 (2013.01); H01Q 23/00 (2013.01); H04B 13/02 (2013.01)] | 2 Claims |

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1. A geophysical or space-based detection, interrogation, or exploration system comprising:
a compact electric dipole driven transmitter for producing a primary electromagnetic field, the compact electric dipole driven transmitter comprising:
a vacuum tube;
a charged particle beam gun positioned for producing a beam bunch of finite length of electrons or ions within the vacuum tube that moves repeatedly and cyclically in its entirety within the vacuum tube at a controlled speed to generate an electromagnetic wave;
a beam timing controller arranged to control at least an on time and an off time of the beam bunch; and
a beam speed controller arranged to control speed of the beam bunch within the vacuum tube; and
an electromagnetic sensing receiver for detecting a secondary electromagnetic field produced by electromagnetic induction in a target responsive to the primary electromagnetic field;
the electromagnetic sensing receiver being configured to employ computer-controlled software that operates an inverse algorithm that processes receiver data resulting from detection by the electromagnetic sensing receiver of the secondary electromagnetic field, and that performs analysis on results of the inverse algorithm to classify the target in a manner that distinguishes material, shape, or location of the target, and that displays results of the analysis.
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