| 摘要 |
This invention offers the capability to passively detect and classify missiles, aircraft, and units with gas turbine engines and rocket motors. It does so by measuring the electromagnetic radiation from ions in the exhaust gas. These emissions are low in frequency and propagate beyond the visual horizon with little attenuation other than through wavefront spreading in the earth-ionosphere waveguide. Acoustic and mechanical processes in combustion chambers and turbines modulate the ion signals in a deterministic manner that makes the engine type classifiable. The proposed passive detection and classification device can sense and identify aircraft, missiles, and potentially ground vehicles and gunfire. This capability will reduce vulnerability of forces to threats and reduce fratricide among friendly units.
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