The inertial navigation system has the following advantages: 1. Since it is an autonomous system that does not rely on any external information and does not radiate energy to the outside, it has good concealment and is not affected by external electromagnetic interference; Time and time 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 produced is good continuity and low noise; 4, high data update rate, short-term accuracy and stability it is good.
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 requires a long initial alignment time before each use; 3. The equipment is more expensive; 4 No time information can be given.
However, the inertial navigation system has a fixed drift rate, which will cause errors in the movement of the object. Therefore, weapons with a long range usually use commands, GPS, etc. to periodically modify the inertial navigation system to obtain continuous and accurate position parameters. Inertial navigation systems have developed flexible inertial navigation, optical fiber inertial navigation, laser inertial navigation, and micro-solid inertial instruments. Gyroscopes have evolved from traditional wire-wound gyroscopes to electrostatic gyroscopes, laser gyroscopes, fiber optic gyroscopes, and micromechanical gyroscopes. Laser gyroscopes have a wide dynamic range, good linearity, stable performance, good temperature stability and repeatability, and have always occupied a dominant position in high-precision applications. Due to scientific and technological progress, the accuracy of lower-cost fiber-optic gyroscopes (FOG) and micro-mechanical gyroscopes (MEMS) is getting higher and higher, which is the direction of future development of gyro technology.
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