AHRS


Overview

Affordable MEMS AHRS

Affordable MEMS AHRS’ were introduced just after 2000, when inertial sensors prices dropped and accuracy improved, to enable the mass introduction of ESP, airbags and built-in car navigation. The improved inertial sensors were used by companies such as Xsens to design an Attitude heading reference system that provides 3D orientation for a broad range of applications from human motion to navigation of unmanned vehicles and the stabilization of antenna and camera systems. The Xsens MTi 10-series and MTi 100-series are proven products in the industrial applications market place.

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GPS enhanced AHRSs

To improve the AHRS performance under long-lasting accelerations and under conditions with severe magnetic disturbance, Xsens offers the MTi-G-710 GPS/INS. The MTi-G-710 uses GPS to determine accelerations and velocity, which can be used to make the referencing with gravity more robust, resulting in a robust roll and pitch. Using the heading and course of the GPS, it is also possible to retrieve heading without using the magnetometers.

The MTi-G-710 is often used in applications that are high-dynamic.

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MEMS AHRSs as a replacement for high-grade IMUs?

Traditional IMUs (e.g. Honeywell, Sagem, and Northrop Grumman/Litef) are used in many applications for navigation, control, and stabilization. With the Xsens AHRSs, it is, however, possible to get similar performance in a smaller package allowing to use them in more applications, such as antenna and camera stabilization, small unmanned vehicles and even hand-held applications.

It also makes the use of orientation sensors possible where an orientation sensor had not been considered before.

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