The invention relates to a technique for measuring an initial attitude of a high-speed rotating
projectile body at a
muzzle, in particular to a method for measuring the initial attitude of the high-speed rotating
projectile body at the
muzzle based on a three-axis micro electro
mechanical system (MEMS) accelerator and two nonorthogonal distributed MEMS gyroscopes to solve the problem of accurately measuring the high-speed rotating
projectile body with high axial overload and high angular speed. The method for measuring the initial attitude of the high-speed rotating projectile body at the
muzzle comprises the following steps: (I) establishing a cannon emission coordinate
system as a reference coordinate
system, setting an emission point of the projectile body in a
barrel as an original point of the reference coordinate
system, and arranging the
barrel in an XnOYn plane of the reference coordinate system; establishing a projectile body coordinate system, setting a projectile body core as an original point of the projectile body coordinate system, and enabling an axis to be along the axial direction of the projectile body; and in the whole process of emitting the projectile body to the muzzle, ensuring that the
yaw angle of the projectile body is zero and the
pitch angle is not changed. The design is reasonable, and the
measurement problem that the range and the accuracy are conflicted when the axis angular rate of the projectile body is measured is solved through the two high-precision small-range gyroscopes.