The IMUs used in ordinary consumer electronics are low-precision and very inexpensive IMUs. These IMUs are commonly used in mobile phones and sports watches and are often used to record the number of steps taken.
The price of the IMU used by driverless vehicles ranges from a few hundred to tens of thousands, depending on the positioning accuracy of the driverless car.
The more accurate IMU will be used for missiles or space shuttles. In the case of missiles, from the missile launch to hitting the target, the aerospace-class IMU can achieve extremely high-precision calculations, and the error can be even less than one meter.
In addition to the characteristics of accuracy and cost, IMU has two very important features. The first is that the update frequency is high, and the working frequency can reach above 100Hz. The second is that the estimation accuracy is short in a short time, and there is not much error. .
In order to achieve higher precision of the IMU, many manufacturers will add magnetometers based on three accelerometers and three gyroscopes. In order to improve reliability, some will increase the number of sensors. Let's take a look at some of the common IMU chip vendors and what are the features of their IMUs.
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