Advantage
The inertial navigation system has the following advantages:
1. Since it is an autonomous system that does not depend on any external information and does not radiate energy to the outside, it has good concealment and is not affected by external electromagnetic interference;
2. It can be used all-weather and all-round Timely work in the air, on the surface of the earth and even underwater;
3. It can provide position, speed, heading and attitude angle data, and the navigation information generated has good continuity and low noise;
4. High data update rate, short-term accuracy and stability good.
Disadvantage
The disadvantages are:
1. Due to the integration of navigation information, the positioning error increases with time, and the long-term accuracy is poor;
2. It takes a long time for initial alignment before each use;
3. The price of the equipment is relatively expensive;
4. , Can not give time information.
However, the inertial navigation has a fixed drift rate, which will cause errors in the movement of objects. Therefore, weapons with a long range usually use commands, GPS, etc. to make regular corrections to the inertial navigation to obtain continuous and accurate position parameters. The inertial navigation system has developed a variety of methods such as flexible inertial navigation, fiber optic inertial navigation, laser inertial navigation, and micro solid-state inertial instruments. Gyroscopes have evolved from traditional wire-wound gyroscopes to electrostatic gyroscopes, laser gyroscopes, fiber optic gyroscopes, and micromechanical gyroscopes. Laser gyroscope 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 the progress of science and technology, the precision of fiber optic gyroscope (FOG) and micromechanical gyroscope (MEMS) with lower cost is getting higher and higher, which is the direction of future gyroscope technology development.
