Missile body elastic mode semi-physical simulation test method

The invention discloses a missile body elastic modal semi-physical simulation test method, which comprises the following steps of: firstly, supposing a missile body as a rigid body, and then calculating the pitch angular velocity, the yaw angular velocity, the y-direction linear acceleration and the z-direction linear acceleration of the rigid body in a missile flight process based on missile flight mechanics; calculating first-order and second-order elastic modal quantities of four variables including real pitch angular velocity, yaw angular velocity, y-direction linear acceleration and z-direction linear acceleration according to a real-flying trajectory or a designed trajectory; and finally, superposing the four parameters of the rigid body and the elastic modal quantity to obtain the real pitch angular velocity, yaw angular velocity, y-direction linear acceleration and z-direction linear acceleration of the missile body. And finally, injecting into an inertial measurement device of a missile. The method i