Attitude and Heading Reference Systems (AHRS) / Articles / Application Note: Absolute Rotation Tracking for AHRS

Application Note: Absolute Rotation Tracking for AHRS

By Mike Ball / 15 Apr 2021

Attitude and Heading Reference Systems (AHRS)

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PNI Sensor TRAX2 AHRS PNI Sensor has released a new application note that outlines the mathematics and code needed to utilize the quaternion output from the company’s TRAX2 AHRS (Attitude and Heading Reference System) module in order to produce the total rotation about all three axes. This will allow unmanned systems and robotics designers to track heading, pitch, and roll changes beyond common 360, +/-90, and +/-180 extremes.

The application note covers:

  • Sensor body frame definitions for the TRAX2
  • PNI Sensor’s quaternion definitions
  • Absolute angle calculations
  • Sample implementation code

TRAX2 can be operated in two different modes, AHRS or digital compass, and is the only AHRS in its class that continuously corrects for gyro drift and provides absolute heading without any additional input such as GPS.

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Posted by Mike Ball Mike Ball is our resident technical editor here at Unmanned Systems Technology. Combining his passion for teaching, advanced engineering and all things unmanned, Mike keeps a watchful eye over everything related to the unmanned technical sector. With over 10 years’ experience in the unmanned field and a degree in engineering, Mike’s been heading up our technical team here for the last 8 years. Connect
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