G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 7/16 (2006.01) G01V 7/04 (2006.01)
Patent
CA 2104354
18 Abstract of the Disclosure: A system for conducting an air-borne gravity survey of earth formations along the flight path of a helicopter or any other aircraft comprises an acceleration/gravity sensor assembly (AGSA) which includes at least one inertial measurement unit (IMU) containing accelerometers and gyroscopes capable of acquiring all three components of total linear as well as angular accelerations and a differential global positioning system (.DELTA.GPS) to provide location of the aircraft for derivation of all three linear motion acceleration components which after substraction from the total linear inertial acceleration components will yield gravity acceleration components. The system may also comprise two acceleration/gravity sensor assemblies each containing accelerometers and gyroscopes capable of acquiring at least the vertical component of motion acceleration and gravity, each sensor assembly being installed in a towed body called "bird" suspended on a cable at a predetermined distance from each other, or mounted one on-board an aircraft and the other suspended from the aircraft at a predetermined distance, or mounted on- board or towed behind and below separate aircraft flying either one above the other or in tandem at a predetermined vertical or horizontal distance 19 respectively. Means are provided for continuously measuring the vertical and horizontal distance between the two sensor assemblies. Means are also provided for subtracting the respective vertical and horizontal components of motion acceleration and gravity of the two sensor assemblies and dividing the difference by the respective distance between the sensor assemblies to provide normalized gravity difference along the respective directions.
Canagrav Research Ltd.
Gowling Lafleur Henderson Llp
LandOfFree
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