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    • 7. 发明授权
    • Method of improving satellite reacquisition performance for integrated GP/IG navigational systems
    • 综合GP / IG导航系统改善卫星重新获取性能的方法
    • US06640189B2
    • 2003-10-28
    • US09955609
    • 2001-09-19
    • Michael S. PerlmutterIan Humphrey
    • Michael S. PerlmutterIan Humphrey
    • G01C2100
    • G01S19/26G01C21/165G01S19/49
    • A method of reacquiring a satellite signal within an integrated GP/IG navigation system includes detecting a loss of synchronization between a timing code in the satellite signal and a corresponding reference timing code. The method includes receiving position data from an inertial guidance unit. The position data is representative of an estimated position (and its associated uncertainty) of the navigation system. The method also includes estimating a distance from the navigation system to the satellite, as a function of the position data, and deriving an initial delay from the distance. The method includes delaying the reference timing code, with respect to the timing code embedded in the satellite signal, by an offset delay substantially equal to the initial delay. The method includes incrementally varying the offset delay until the timing code embedded in the satellite signal is synchronized with the reference timing code, or until the offset delay equals a predetermined end limit value.
    • 在集成GP / IG导航系统内重新获取卫星信号的方法包括检测卫星信号中的定时码与对应的参考定时码之间的同步丢失。 该方法包括从惯性引导单元接收位置数据。 位置数据代表导航系统的估计位置(及其相关联的不确定性)。 该方法还包括根据位置数据估计从导航系统到卫星的距离,以及从该距离导出初始延迟。 该方法包括相对于嵌入在卫星信号中的定时码延迟参考定时码与基本上等于初始延迟的偏移延迟。 该方法包括逐渐改变偏移延迟,直到嵌入在卫星信号中的定时代码与参考定时码同步,或者直到偏移延迟等于预定的限制值。