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1. 发明授权

US5957982A Method and system for space navigation 失效
标题翻译：空间导航方法和系统
公开(公告)号：US5957982A
公开(公告)日：1999-09-28
申请号：US135884
申请日：1998-08-18
申请人： George C. Hughes , Michael J. Wehner , Mark L. Hanson , D. Hobson Lane , Paul A. Lavoie , Warren H. Taylor , Bryan H. Kang , Paul Steiner , Arnold J. Galloway , Michael Busby
发明人： George C. Hughes , Michael J. Wehner , Mark L. Hanson , D. Hobson Lane , Paul A. Lavoie , Warren H. Taylor , Bryan H. Kang , Paul Steiner , Arnold J. Galloway , Michael Busby
IPC分类号： G06F17/10 , G06F15/00
CPC分类号： G06F17/10
摘要： A method that allows a space vehicle to determine navigation information represented by the contents of a state vector. The method includes the steps of intermittently receiving navigation signals, initializing the state vector with an estimate of the navigation information, and generating a predicted state vector that represents the predicted values for the navigation information after a predetermined time increment in the future. The method further determines whether a navigation signal has been received within a predetermined window of time from a navigation beacon. If a navigation signal has been received, the method updates the state vector and the contents of the state vector are propagated forward in time to provide an estimate of the navigation information after a predetermined time increment. In some instances, however, a navigation signal is not received within the predetermined window of time. In such situations, the method simply propagates the contents of the predicted state vector forward in time. Thus, the predicted state vector maintains an estimate of the current navigation information even in the absence of a navigation signal.
摘要翻译：一种允许航天器确定由状态向量的内容表示的导航信息的方法。该方法包括以下步骤：间歇地接收导航信号，利用导航信息的估计来初始化状态向量，并且在将来经过预定的时间增量之后生成表示导航信息的预测值的预测状态向量。该方法还确定在导航信标的预定窗口内是否已经接收到导航信号。如果已经接收到导航信号，则该方法更新状态向量，并且状态向量的内容在时间上向前传播，以在预定时间增量之后提供对导航信息的估计。然而，在一些情况下，在预定的时间窗口内没有接收到导航信号。在这种情况下，该方法简单地将预测状态向量的内容及时传播。因此，即使在不存在导航信号的情况下，预测状态矢量也保持当前导航信息的估计。

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