The role of MEMS accelerometer in inertial navigation The
inertial navigation system has the following advantages:
1. Because it is an independent system that does not depend on any external information or radiate energy to the outside, it is good in concealment and is not subject to external electromagnetic interference The impact
2. It can work in the sky, on the surface of the earth and even underwater all the time and all the time.
3. It can provide position, speed, heading and attitude angle data. The generated navigation information has good continuity and low noise.
4. Data update rate , Short-term accuracy and stability.
Inertial navigation system has the following disadvantages:
1, the navigation information is generated through integration because positioning error increases with time, the difference between long-term accuracy
2, takes a long time before each use initial alignment
3, the price of the device more expensive
4 , Can not give time information
However, inertial navigation has a fixed drift rate, which will cause errors in the motion of objects. Therefore, weapons with long range usually use commands, GPS, etc. to modify the inertial navigation regularly to obtain continuous and accurate position parameters. Inertial navigation systems have developed flexible inertial navigation, fiber optic inertial navigation, laser inertial navigation, micro-solid state inertial instruments and other methods. Gyroscopes have evolved from traditional winding gyros to electrostatic gyros, laser gyros, fiber optic gyros, micromechanical gyros, etc. The laser gyro has a wide dynamic range, good linearity, stable performance, good temperature stability and repeatability, and has always occupied a dominant position in the field of high-precision applications. Due to technological advancement, the lower cost fiber optic gyroscope (FOG) and micromechanical gyroscope (MEMS) are getting higher and higher precision, which is the future development direction of gyro technology.
The MEMS accelerometer is mainly based on the acceleration generated when the carrier moves linearly and thus the integral is calculated and input into the calculation software to obtain the required parameters, so the mems accelerometer is essential here. The MSME gyroscope is a carrier that provides an accurate angle mainly during rotation. The integral solution can be used to wait until the correct angle direction to ensure that the carrier will not deviate from the destination.
Therefore, the role of mems accelerometer is to ensure the acceleration and the distance calculated by the integral solution when the carrier moves linearly.
