IMU Inertial Measurement Unit (IMU) is everywhere in our daily life and we are enjoying the convenience of IMU all the time.
As early as 2010, Apple's iPhone 4 newly added 3-axis gyroscope, with the iPhone standard accelerometer, providing 6 axes of motion sensing function, leading major cell phone manufacturers to follow, IMU gradually and widely into the field of consumer electronics. IMU is so close to our life, but what is IMU in the end?
IMU (Inertial Measurement Unit), the principle of inertial measurement unit, is implemented using the law of inertia and is mainly used to detect and measure acceleration and rotational motion sensors. These sensors range from ultra-small MEMS sensors to laser gyroscopes with very high measurement accuracy, from MEMS sensors of a few millimeters in size to fiber-optic devices with a diameter of nearly half a meter that use this principle.
In a narrow sense, an IMU is equipped with gyroscopes and accelerometers on three orthogonal axes, with a total of six degrees of freedom, to measure the angular velocity and acceleration of objects in three-dimensional space, which is known as "6-axis IMU"; in a broader sense, IMUs can add magnetometers to accelerometers and gyroscopes to form a "9-axis IMU".
The 9-axis sensor with the addition of a magnetometer is also known as the AHRS Attitude and Heading Reference System (AHRS). Because the heading angle is referenced by the geomagnetic field, it does not drift and is widely used in aerospace and automotive navigation.
Accelerometer.Detection of acceleration signals in independent three axes of the carrier coordinate system.
Gyroscope.Detection of the angular velocity signal of the carrier with respect to the navigation coordinate system.
Magnetometer.Algorithms such as Kalman or complementary filtering are used to provide the user with absolute reference pitch, roll and heading angles.
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