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    • 1. 发明授权
    • Location accuracy improvement using a priori probabilities
    • 使用先验概率进行位置精度提高
    • US08478291B2
    • 2013-07-02
    • US12870564
    • 2010-08-27
    • Jeffrey F. BullRashidus S MiaRobert J Anderson
    • Jeffrey F. BullRashidus S MiaRobert J Anderson
    • H04W24/00
    • G01S5/0278G01S5/0252H04W64/00
    • A large volume of high accuracy location data is determined in many commercial wireless networks from location based services (LBS) and, in the United States, for E911. Uplink-Time-Difference-of-Arrival (UTDOA) and Assisted GPS (AGPS) are the predominant geolocation technologies providing these high accuracy locations. In the US alone over 10 million wireless subscribers are located every month because they dial the national emergency number “911” on their mobile phones. This rich set of location data provides an a priori distribution of the location of subscribers in the wireless network. All digital wireless communications networks have a mechanism for the subscribers to time synchronize their handsets to the network. This mechanism provides a band of ranges from the serving cell site to the handset. An a posteriori location estimate can be determined very quickly by considering the a priori distribution of callers in the range band that the current subscriber is in.
    • 在许多商业无线网络中,从基于位置的服务(LBS)和在美国的E911确定了大量的高精度位置数据。 上行 - 时差到达(UTDOA)和辅助GPS(AGPS)是提供这些高精度位置的主要地理位置技术。 在美国,每个月都有超过1000万无线用户位于他们的手机上拨打国家紧急号码“911”。 这种丰富的位置数据集提供了无线网络中用户位置的先验分布。 所有数字无线通信网络具有用于用户将其手机时间同步到网络的机制。 该机制提供从服务小区站点到手机的范围的频带。 通过考虑当前用户所在的范围频段内的呼叫者的先验分布,可以非常快速地确定后验位置估计。