Inertial navigation system

Inertial Navigation System (INS), also known as inertial reference system, is an autonomous navigation system that does not rely on external information and does not radiate energy externally (such as radio navigation). Its working environment includes not only air, ground, but also underwater. The basic working principle of inertial navigation is based on Newton’s laws of mechanics. By measuring the acceleration of the carrier in the inertial reference system, integrating it with time and transforming it into the navigation coordinate system, it can be obtained in the navigation coordinate system. Information such as speed, yaw angle and position.

The inertial navigation system belongs to the inferred navigation mode, that is, the position of the next point is calculated from the position of a known point based on the continuously measured moving body heading angle and speed, so that the current position of the moving body can be continuously measured. The gyroscope in the inertial navigation system is used to form a navigation coordinate system, so that the measurement axis of the accelerometer is stabilized in the coordinate system, and the heading and attitude angle are given; the accelerometer is used to measure the acceleration of the moving body, after the time One point gives the speed, and the speed is then integrated by one time to get the displacement.

Several navigation techniques are common in modern times, including astronomical navigation, inertial navigation, satellite navigation, radio navigation, etc. Among them, only inertial navigation is autonomous, neither radiating things to the outside world, nor looking at stars in the sky or receiving external The signal, its concealment is the best.

Inertial navigation is not as “unreliable” as everyone thinks. Many strategic and tactical weapons like the state, like civil aviation aircraft flying on the intercontinental, must rely on inertial navigation systems or inertial navigation systems and other types of navigation. A combination of systems. Its cost is also relatively expensive, like a navigation level (that is, 1 nautical mile 1 nautical mile) of the inertial navigation system, at least hundreds of thousands, and this precision navigation system is enough to be equipped on a plane such as the Boeing 747. Now, with the advancement of mems (micro-electro-mechanical systems) inertial device technology, commercial-grade, consumer-grade inertial navigation has gradually entered the homes of ordinary people.

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