Inertial measurement unit is a device that measures the three-axis attitude (or angular rate) and acceleration of an object. In general, an IMU contains three single-axis accelerometers and three single-axis gyroscopes. Accelerometer detects the acceleration signals of object in the carrier coordinate system independently of the three axes, and gyroscope detects angular velocity signal of carrier relative to the navigation coordinate system. Measure the angular velocity and acceleration of the object in three-dimensional space and solve the object’s pose.
The difference between AHRS and IMU is that AHRS includes the embedded attitude data solution unit and heading information, and IMU only provides sensor data and does not provide accuracy. Reliable gesture data function. Actually AHRS has one more magnetic field sensor than IMU, and why AHRS is lower than IMU and needs to rely on gravity field and magnetic field? This is determined by the sensor device architecture. AHRS sensors are usually low cost MEMS sensors. The noise of gyroscopes and accelerometers of such sensors is relatively large. The IMU’s gyroscope uses fiber optic gyro or mechanical gyro or ring laser gyro. Gyro cost is high, and gyro accuracy is also high relative to the MEMS. AHRS usually combines GPS and barometers to get location information.
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