The Feature Of Inertial Sensor – IMU

The inertial measurement unit is a device that measures the three-axis attitude angle and acceleration of an object. Generally, an IMU contains three single-axis gyroscopes and three single-axis accelerometers. The accelerometer detects the acceleration signals of the object in the carrier coordinate system independently of the three axes, and the gyroscope detects the angular velocity signal of the carrier relative to the navigation coordinate system. , Measure the angular velocity and acceleration of the object in three-dimensional space, and use this solution to calculate the attitude of the object. It has very important application value in navigation.

Inertial measurement unit, theoretical mechanics tells us that all motions can be decomposed into a linear motion and a rotational motion, and this inertial measurement unit is used to measure these two types of motion, linear motion can be measured by an accelerometer, and rotational motion by Gyro to measure. The wonderful combination of the two makes the inertial measurement unit come into being.

Adding more sensors to each axis in the inertial measurement unit increases reliability. Generally speaking, the IMU should be installed on the center of gravity of the measured object. IMUs are mostly used in devices that require motion control, such as cars and robots. It is also often used in situations that require precise displacement estimation with attitude, such as inertial navigation equipment for submarines, aircraft, missiles and spacecraft.

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