In environments where the land which needs to be surveyed is vast, MRS deploys an Airborne Multi-Sensor Magnetic Gradiometer.
This cutting edge technology is a custom designed, multi-sensor potassium magnetic gradiometer. The system is towed by a helicopter on a 100 ft long tow cable that completely isolates the sensors from helicopter noise. The tow cable is designed to hold the weight of the system and integrates numerous safety protocols including clamping systems, break away mounts and a shear-pin weak-link which will release the system in the event of a hang-up.
The gradiometer is uniquely designed to keep a large separation between the equipment electronics and the magnetic sensors. This allows for cleaner data collection unaffected by electronic noise. By design, the sensor positions not only allow for the measurement of a vertical gradient (difference between the vertical sensor pairs), but also the cross-line gradient (difference between lateral sensors) and the inline gradient (difference between subsequent records throughout time). The combination of the above results in a powerful tool for the detection of the most subtle targets.
Using specialized instrumentation such as redundant altimeters (laser and radar), the platform can be towed as low as 6 ft above the water or land to maximize the detection of nearby targets. The lateral spacing of a survey can be adjusted to accommodate the target size of interest. The system also is equipped with high precision RTK positioning with centimeter accuracy and a tri-axis digital attitude sensor.
Typical survey speeds range from 30 to 50 knots and the system can handle up to 30 knot winds with no degradation of data quality. This results in a much larger survey window (less down time) and far higher production rates especially when compared to water towed systems.