Advanced Technology Underwater Gravity System for Autonomous Underwater Vehicles

Dynamic Gravity Systems has developed the AT1U as a low-cost solution for user that that would like to add a dynamic gravity meter for their existing AUV, for underwater marine survey applications. The systems include the Gravity sensor and the electronics necessary for acquiring and storing the Gravity horizontal accelerations, sensor temperature, and other signals. The AT1U has very high stability and low drift, with an excellent Clamp / Un-clamp repeatability.

Specifications:
Gravity Range/Specific ForceFull World-Wide Range (20,000 mGals)
Sensor TypeFull-feedback Zero-Length Spring
Resolution0.005 milliGals (mGals)
Static Repeatability0.01 to 0.02 mGals
Drift Rate< 2 mGal/month from factory
< 0.5 mGal/month after aging
Data Recording Frequency1Hz
Temperature Range-25°C to +45°C
Dimensions (approximate)20(l) x 18(w) x 25(h) cm
Weight (approximate)Sensor and Battery 4kg
+5kg with hard case
Power SourceRechargeable Lithium Battery
Available OptionsLow temperature environment accessories

Gravity is a powerful tool to profile underground structures. Surface ship gravity is an efficient way to collect gravity over a relatively large marine region with medium resolution, due to the distance from the sea floor. A sea-floor gravity meter can observe gravity with high resolution, but are limited to small areas and quiet sites.

The AT1-AUV-M can allow operators to match the performance of the sea bottom meters, but over a much larger area, through integration with your autonomous underwater vehicle (AUV), allowing high-resolution data collection over an area dependent only on your AUV platform.

Typically, gravity drifts less than 2 mGals/month and 0.5 mGals/month after aging. This sensor also has excellent clamp / un-clamp repeatability, almost comparable with a Land Meter, which allows the meter to be used as a sea bottom surveying meter with repeatability better than 0.030 mGals. The AT-AUV has been designed as a Dynamic Gravity Sensor with with a world-wide gravity range of 20,000 mGals making the sensor ideal for dynamic gravity reading. For this application the user needs to provide a suitable gyroscopic stabilizing platform and accurate positioning capability. A typical repeatability of the dynamic readings is sigma < 0.060 mGal.


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