Patent ID: 7830150

Claim:
An airborne electromagnetic prospecting system, comprising: a transmitter loop structure that is attached to, and arranged to be towed by, a towing aircraft; transmitting means fitted to the transmitter loop structure for transmitting a primary electromagnetic field; receiving means for receiving a primary and a secondary resulting electromagnetic field, the secondary resulting electromagnetic field arising from the interaction of the primary field with ground conductors that are traversed by the towing aircraft; and a high drag bird attached to, and arranged to be towed by, the transmitter loop structure and the towing aircraft, the high drag bird comprising a body housing the receiving means, a rigid nose extending from the body for allowing the high drag bird to be connected to the transmitter loop structure, and a yoke assembly extending from the body for allowing the high draft bird to be connected to the towing aircraft, so as to keep apositional geometry and an angular geometry of the receiving means relative to the transmitting means substantially constant over a range of airspeeds, and wherein a drogue is fitted to the high drag bird so as to keep the high drag bird substantially in line with the transmitter loop structure.