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11. 发明授权

US08159392B2 Frequency aiding method and system for navigation satellite receiver with crystal oscillator frequency hysteresis 有权
标题翻译：具有晶体振荡器频率滞后的导航卫星接收机频率辅助方法和系统
公开(公告)号：US08159392B2
公开(公告)日：2012-04-17
申请号：US13102513
申请日：2011-05-06
申请人： Xin Jin , Christopher James Grant , Andrew Jonathan Gilbert Rosselet
发明人： Xin Jin , Christopher James Grant , Andrew Jonathan Gilbert Rosselet
IPC分类号： G01S19/24 , G01S19/29
CPC分类号： G01S19/235 , G01S19/25
摘要： A method and apparatus for estimating oscillator signal variation due to temperature and for providing an estimated frequency to a GPS receiver in order to assist the GPS receiver to acquire the signals quickly is disclosed. A temperature sensor is closely thermally coupled with the crystal oscillator in the GPS receiver and during GPS tracking mode, when the error in the oscillator signal is known with precision, outer bounds of TCXO frequency at given temperatures are maintained, which may correspond to rising and falling temperature conditions. During acquisition mode, an estimated frequency value is provided to the GPS receiver based on a determined average of these bounds. Optionally, an uncertainty factor associated with the frequency estimated may also be provided. The two bounds take into account the hysteresis effects of the oscillator signal drift due to temperature so that a more accurate initial frequency estimate can be provided to the GPS receiver, thus reducing its average time to first fix.
摘要翻译：公开了一种用于估计由于温度引起的振荡器信号变化并用于向GPS接收机提供估计频率以便帮助GPS接收机快速获取信号的方法和装置。温度传感器与GPS接收机中的晶体振荡器紧密耦合，并且在GPS跟踪模式下，当精确地知道振荡器信号的误差时，保持给定温度下TCXO频率的外界，这可以对应于上升和下降降温条件。在采集模式期间，基于所确定的这些边界的平均值，向GPS接收机提供估计的频率值。可选地，还可以提供与估计的频率相关联的不确定因素。两个界限考虑了由于温度引起的振荡器信号漂移的滞后效应，从而可以向GPS接收机提供更准确的初始频率估计，从而减少其平均首次固定时间。

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