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提出一种基于脉冲星导航和捷联惯导的容错组合导航系统.捷联惯导具有自主性和不间断性的优点,可弥补脉冲星导航滤波周期较长的缺陷;脉冲星导航的长期稳定度好,可抑制捷联惯导的误差随时间发散.该系统根据轨道动力学模型和SINS估计航天器的状态,利用脉冲星导航的观测量分别修正估计误差,通过相位残差检测天体遮挡等因素引起的故障,利用联邦扩展卡尔曼滤波融合导航信息.仿真实验结果表明:同脉冲星导航方法相比,该方法具有更高的精度和更短的滤波周期,且不受天体遮挡的影响.
A fault-tolerant integrated navigation system based on pulsar navigation and SINS is proposed. SINS has the advantages of autonomy and uninterrupted, which can make up for the short period of pulsar navigation filtering cycle. The long-term stability of pulsar navigation Which can restrain the SINS error from diverging with time.The system estimates the spacecraft’s state according to the orbit dynamics model and SINS, corrects the estimation error respectively by observing the Pulsar navigation, and detects the occlusion by the phase residual detection object The fault caused by the factor, and uses the federated extended Kalman filter to fuse the navigation information.The simulation results show that compared with the pulsar navigation method, this method has higher accuracy and shorter filtering period and is not affected by celestial obstructions.