AHRS vs IMU: from measurements to orientation
1:00 · English narration · YouTube Shorts
Define the output first
List the measurements, coordinate frame, update interval and interface required by your controller. Reading a ready-to-use angle is a different integration task from processing raw inertial measurements.
The distinction
An IMU primarily measures acceleration and angular rate. An AHRS combines sensor measurements to estimate attitude and heading. Magnetic heading can be affected by the installation environment. Check the actual outputs and specifications in the model manual.
Choose the integration format
Consider the housed RB-SDA-v1 for USB or RS-232 integration. RB-OB-v1 is a board-level option using LV TTL UART. Position coordinates require a positioning solution; an orientation sensor alone is not an RTK receiver.
Before selecting a model
Check the output format, power supply, space, host interface and evaluation conditions. Component noise figures are not a guarantee of complete-system heading accuracy.
Prepare an inquiry
Include your equipment type, controller, required outputs, update interval and installation constraints. For a replacement, include the current model and connector pinout.
Product information: ROBOR product catalog and model manuals. Always check your model and firmware.
Further reading: AHRS principles — VectorNav