Abstract: In the process of inertial group aiming,the inertial group measuring unit and the optical tube collimation deviation angle measurement unit are completed under different measuring coordinates,and the direct synthesis of aiming angle will lead to large coupling error.Aiming at this problem,a method for solving the aiming angle of inertia group is presented,and the transformation relationship between each coordinate system is obtained by matrix method.The attitude angle of the output reference in the geographical coordinate system is obtained and the azimuth angle of the target prism is obtained by aiming calculation.

Key words: Lase gyro strap down inertial measurement unit, Coordinate transformation, Aiming, Solution