Advanced Navigation is a leading manufacturer of Inertial Measurement Units (IMU) and Attitude and Heading Reference Systems (AHRS). Our solutions combine temperature-calibrated accelerometers, gyroscopes, and magnetometers with an AI-based fusion algorithm to deliver accurate and reliable orientation.
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AHRS stands for Attitude and Heading Reference System.
Attitude refers to an object’s orientation relative to the horizontal plane that is parallel to the horizon. This is often described as pitch and roll.
Heading is the direction a vessel is pointing towards relative to True North.
An AHRS is often used in aircraft and can also be used as a navigation aid for ground-based robots. Other uses for AHRS include measuring human movement by sports scientists.
AHRS are often made from micro-electromechanical systems, or MEMS. Therefore the compact and lightweight nature of an AHRS allows it to be used in vessels that require a small SWaP-C (size, weight, power and cost).
This small SWaP-C makes AHRS ideal for unmanned aerial vehicles (UAV) which need accurate measurements but can’t carry an instrument that is heavy or bulky.
Typically an AHRS is used for:
An AHRS is comprised of IMUs (inertial measurement unit) on three orthogonal axes (commonly referred to as X, Y and Z). Typically these IMUs contain:
Accelerometers measure the linear force acting on the vehicle. This includes gravity, which is used to determine the orientation of the vehicle with respect to the centre of the Earth.
Gyroscopes measure the rotational force acting on the vehicle.
Magnetometers measure magnetic fields. If the position of the vehicle is known, the vehicle heading relative to magnetic north can be determined. Heading relative to True North can also be found due to the known declination value.
Additional sensors can be incorporated to assist an AHRS. A common addition is the use of a dual antenna GNSS receiver (global navigation satellite system). By using two GNSS antennas the vehicle heading can be determined to a much higher accuracy.
If minimal SWaP-C is not required, higher accuracy gyroscopes based on fiber optic technologies (FOG) can dramatically increase attitude and heading accuracy.
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