IHMC’s robotic exoskeleton strides towards the future with Orientus AHRS
Stephane Recouvreur4 August 2021
Advanced Navigation is a leading manufacturer of high-accuracy MEMS and FOG inertial measurement units (IMU) and attitude and heading reference systems (AHRS). The IMUs combine calibrated high-accuracy accelerometers, gyroscopes, and magnetometers that are put through an intensive 8-hour temperature calibration process. This provides the highest accuracy possible for each sensor class over the full operating temperature range (-40° C to 85° C). A high output rate of 1000 Hz ensures high dynamic performance in the most demanding applications.
The MEMS-based IMU / AHRS range covers industrial and tactical performance grades. For applications requiring higher accuracy, our range of fibre-optic gyroscopes (FOG) INS offers IMU and AHRS capabilities, with bias instability as low as 0.001°/hr and roll and pitch accuracy as high as 0.005°.
Thanks to vertical integration, Advanced Navigation has total control over both hardware manufacturing and software design, enabling us to set a new benchmark for accurate and reliable motion sensing and orientation.
Advanced Navigation IMU / AHRS are used by the world’s leading companies for both commercial and defence applications. Our global team of support engineers ensures that our solutions are successfully integrated into your systems.
Our IMU & AHRS
MEMS IMU
Our MEMS-based IMU / AHRS range covers industrial and tactical performance grades. For applications requiring even higher accuracy, our fibre-optic gyroscopes (FOG) INS range offers IMU and AHRS capabilities. All Advanced Navigation inertial systems use a common communication protocol, enabling customers to extend their product range by moving up or down the accuracy spectrum without incurring re-engineering costs.
Orientus
Rugged and cost-effective IMU
Roll & Pitch
0.2 °
Heading (Magnetic)
0.8 °
Bias Instability
3 ° / hr
Update Rate
1000 Hz
Motus
Ultra-high accuracy MEMS IMU
Roll & Pitch
0.05 °
Heading (Magnetic)
0.8 °
Bias Instability
0.2 ° / hr
Update Rate
1000 Hz
IMU/AHRS Case Studies
Why Choose Advanced Navigation
High Performance
Our systems deliver the highest performance and richest feature set on the market. We back our performance claims with free product trials.
Trusted Reliability
All our systems are designed and tested to safety standards with fault tolerance built in to provide you with the highest reliability possible. Our reliability is trusted by many of the world’s largest companies.
Quality
Our systems are built to the highest quality standards in Australia to endure the test of time in the most difficult conditions. You can rely on our products.
They Trust Us
Common Questions about Attitude and Heading Reference Systems & Inertial Measurement Units
What is an Attitude and Heading Reference System (AHRS)?
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.
How does an AHRS work?
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
- Gyroscopes
- Magnetometers
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 fibre optic technologies (FOG) can dramatically increase attitude and heading accuracy.
Why use heading reference systems?
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:
- Surveying
- Autonomous manufacturing robots
- Underwater navigation
- Surface marine navigation
- Tracking human movement for sports science
What is the difference between an Inertial Navigation System (INS), Attitude & Heading Reference System (AHRS) and Inertial Measurement Unit (IMU)?
The output of an IMU is raw sensor data from the accelerometer (linear acceleration), gyroscope (rotational rates) and optionally a magnetometer (magnetic heading).
This information can be used for measuring the motion of an object in 3 dimensions (for example, am I pointing up and how fast am I spinning). An attitude heading and reference system (AHRS) contains an IMU, however, it also has onboard processing that applies filtering/sensor fusion to the IMU data to accurately determine the orientation (represented as roll, pitch and heading/yaw), velocity and relative position.
An AHRS coupled with a global navigation satellite system (GNSS) that provides absolute position and velocity information is referred to as an inertial navigation system (INS). An INS fuses AHRS and GNSS information to provide a very reliable representation of a system’s absolute position, orientation and velocity.
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