Miniature AHRS triaxial Accelerometer

The new 3DM-GX3 series of miniature Attitude Heading Reference System (AHRS) sensors, starts with the introduction of the 3DM-GX3-25, which incorporates triaxial accelerometers, gyros and magnetometers.

Future models will offer other sensor grades, a more basic inertia measurement unit, and a unit with GPS incorporated.

The main feature of this new system is the small size and weight. Excluding the mounting tabs this sensor is 44mm long, 25mm wide and 11mm high, and weighs just 18 grams. Output modes from this system include acceleration, angular rate, magnetic field, delta angle and velocity, Euler angles and rotation matrix.

All quantities are fully temperature compensated and corrected for sensor misalignment. The 3DM-GX3 series offers improved navigation under vibration, as sensors are sampled at 30kHz and digitally filtered and scaled into physical units. They have a user adjustable data rate from 1 to 1000Hz.

A ±5g accelerometer range and ±300deg/sec gyro range are standard, but there are options for other ranges. A lower cost and smaller OEM version is available with a USB or TTL interface, and a smaller connector.

Applications for this device would include use in unmanned vehicles and robotics, platform stabilisation, antenna and camera pointing, and location tracking.

November 2009

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