两种基于互补滤波的姿态算法，对陀螺仪和加速度计进行数据融合，解算姿态。一种使用了梯度下降算法，另一种使用反馈修正和李雅普诺夫分析。-Two algorithms for attitude estimate based on complementary filtering. Data form Gyroscope and Accelerometer are fused. One is based on gradient descent algorithm while the other is based on the feedback and Lyapunov stability.