What Is the Working Principle of Inertial Navigation System in Space Shuttle

Nowadays, inertial navigation has been updated for several generations. Most of the units are installed with high-precision strapdown inertial navigation, which is more convenient and lightweight than the previous bulky platform 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 or radiate energy to the outside (such as radio navigation). Its working environment includes not only air, ground, but also underwater.

The basic operation principle of inertial navigation is based on the law of Newtonian 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, we can get the information such as velocity, yaw angle and azimuth in the navigation coordinate system. Inertial navigation system belongs to the calculation navigation mode, that is, the azimuth of the next point is calculated from the azimuth of a known point according to the successively measured heading angle and velocity of the moving body, so the current azimuth of the moving body can be continuously measured.

The gyroscope in the inertial navigation system is used to form a navigation coordinate system to stabilize the measurement axis of the accelerometer in the coordinate system, and give the heading and attitude angle; The accelerometer is used to measure the acceleration of a moving body. The velocity is obtained by one-time integration of time, and then the displacement can be obtained by one-time integration of velocity. There are several common navigation skills in modern times, including geographic navigation, inertial navigation, satellite navigation, radio navigation and so on.

As long as inertial navigation is autonomous, it does not radiate things to the outside world, nor does it have to look at the stars in the sky or accept external signals, its concealment is the best. No matter UAV, airliner, fighter, early warning aircraft and bomber, they are equipped with high-precision strapdown inertial navigation system, so that they can use inertial navigation to determine the flight attitude and destination when they cannot accept GPS external signals.

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What Is the Working Principle of Inertial Navigation System in Space Shuttle 1

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