| 摘要 |
In systems carried by aircraft that transmit and receive electromagnetic fields for geophysical exploration, it is known to mount transmitting antennae on an aircra ft or other rigid structure attached to or towed beneath an aircraft. In every case, the are a of the transmitting antenna is limited by the dimensions of the rigid structure, which limits the dipole-moment of the antenna and thus the strength of the signal received by the system. This limitation is particularly severe for systems using antennae in towed structures . The present invention consists of a system that incorporates an airborne electromagnetic tra nsmitting antenna with flexible area. Before take-off and during landing, the area of the antenna may be collapsed for safety and convenience. In flight, the antenna assumes a large and stable area, which induces strong electromagnetic responses from conductive features in the e arth.
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