【摘要】 本文基于姿态矩阵四元数算法，应用Ｐｏｉｎｃａｒｅ 截面分析研究船用捷联惯导系统姿态的估计过程。结果表明，当载体受周期激励尤其是三个方向的周期激励时，载体的姿态估计可能呈现浑沌结果。由于浑沌运动对初值非常敏感，因此姿态估计的浑沌结果将导致基于递推的捷联导航系统精度下降。所以，对这种浑沌应当引起重视更多还原

【Abstract】 Based on the algorithm of attitude matrix,this paper studies the attitude estimate of ship strapdown inertial navigation system (SINS) by using the method of Ponicare crosssection analysis.It is shown that the attitude estimate may be chaotic if the system is driven by period signals,especially in three directions.Because it is sensitive to preliminary conditions,the chaos of estimate may lower the accuracy of SINS.Therefore we should pay attendtion to this kind of chaos.更多还原