In this paper, a filtering algorithm is studied for the agile projectile's attitude determination. An incomplete inertial
measurement unit (IMU) composed of only three low-cost micro electro-mechanical system (MEMS) accelerometers is
used to determinate the attitude of agile projectile. Considering the gravity vector remains constant around the firing
position in a short time, the agile projectile's attitude and rotary speed in flight is estimated by using filtering algorithm
according to the information of three accelerometers. The experimental results in three-axis flight rotary table show that
the filtering algorithm in this paper quickly converges and the precision of estimation is high.
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