Fiber optic gyro ( fog ) inertial system provides angular velocity and acceleration measurement of measurement body along three axes , based on the attitude matrix refreshed by outputs angular velocity to transform the acceleration from the body frame to the earth frame , finally through acceleration integral we can get the position of the measurement body in the space . fog is popular in the navigation field for many advantages , such as wide dynamic range , high resolution and all solid components 该测量方法利用捷联式光纤陀螺输出的角速度和加速度信息，测出运载体沿三个方向的加速度分量；再利用光纤陀螺输出的角速率信号，不断更新测量体的姿态转换矩阵，将加速度分量用转换矩阵更换到地理坐标系；最后经过计算机对转换后的加速度信号积分运算分别可得到运载体在三维空间中的位置。
