The linear acceleration is the acceleration of the center along the trajectory direction when the aircraft moves in inertial space, which is called the linear acceleration of the aircraft. The inertial guidance system is sensitive to the acceleration of the aircraft through the linear acceleration sensor, and the velocity and displacement of the aircraft can be obtained from the first and second integration of the acceleration data, and the range, distance, angle and direction of the aircraft can be obtained by calculation. There are many kinds of linear acceleration sensors, the simplest of which is the spring mass system acceleration sensor, but its lower measurement limit can not meet the requirements of inertial navigation.
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