INS is a system which use the gyro and accelerameter install on carrier to measure the position of carrier. Through the measured data of gyro and acceleromater, it can confirm the motion of carrier in inertial reference coordinate system, and also can accumulate the position of carrier in inertial reference coordinate system.
Unlike the navigational system of other kinds, inertial navigation system is completely autonomous and neither transmit signals to outside nor receive signals from outside. Inertial navigation system must accurately know the position of carrier at the beginning of the navigation, inertial measurements are used to estimate the position changes that have taken place after the start-up.
Accelerometer is a instrument used to measured the accelerometer of object, an INS contain three accelerometers, each accelerometer can sense the accelerometer of one direction, usually three sensitive directions are perpendicular to each other. In order to navigate with reference to the inertial reference frame, the accelerometer must be tracked. The gyroscope can be used to sense the rotational motion of the carrier relative to the inertial reference frame so that the accelerometer can be measured at all times. With this information, you can decompose the acceleration into a reference coordinate system and then integrate.
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