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1.发明授权Providing an accurate timing source for locating the geographical position of a mobile 有权为移动设备的地理位置提供准确的定时源公开(公告)号：US06493539B1
公开(公告)日：2002-12-10
申请号：US09362548
申请日：1999-07-28
IPC分类号： H04Q720
CPC分类号： H04W56/00 , G01S5/021 , G01S5/0226 , H04B7/2687 , H04L7/033 , H04W64/00
摘要： The synchronization system uses a TDMA or AMPS air interface to provide timing synchronization between previously unsynchronized base stations. The synchronization of base stations is critical between when determining the geographical position of a mobile because the geographical position is determined using a time difference of arrival method. In order to synchronize a remote base station with a serving base station, the remote base station receives a signal from the serving base station and measuring the receiving time of the signal at the remote base station in relation to the clock of the remote base station. The synchronization system determines the transmission time of the signal based on the reception time of the signal and the distance between the base stations, in relation to the clock signal of the second station, and synchronizes the clock of the remote base station to the clock of the serving base station based on the offset in the clock cycles at the time the signal was transmitted.
摘要翻译： 同步系统使用TDMA或AMPS空中接口来提供先前不同步的基站之间的定时同步。 在确定移动站的地理位置时，基站的同步至关重要，因为使用到达时间方法确定地理位置。 为了使远程基站与服务基站同步，远程基站从服务基站接收信号，并相对于远程基站的时钟测量远程基站处的信号的接收时间。 同步系统基于信号的接收时间和基站之间的距离相对于第二站的时钟信号确定信号的传输时间，并将远程基站的时钟同步到 基于在发送信号时的时钟周期的偏移的服务基站。
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公开(公告)号：US5541608A
公开(公告)日：1996-07-30
申请号：US412461
申请日：1995-03-29
摘要： A hybrid amplitude/phase comparison direction finding system for aircraft, employing a unique calibration system to compensate for tolerance variations in the antennas. The calibration system utilizes a programmable read only memory (PROM) for each antenna pair, wherein calibration data from pre-measured antenna patterns of the associated antennas are stored. The calibration data preferably includes measured relative amplitude (electromagnetic field strength) and phase data, as a function of frequency and angle from a common reference plane, for the associated antenna pair. This calibration data is stored in a PROM which is preferably disposed within an assembly which includes the antenna pair. A system processor can then retrieve the calibration data during system operation, whereupon angle of arrival measurements can be performed with improved accuracy.
摘要翻译： 用于飞行器的混合幅度/相位比较方向发现系统，采用唯一的校准系统来补偿天线中的容限变化。 校准系统为每个天线对使用可编程只读存储器（PROM），其中存储来自相关天线的预先测量的天线方向图的校准数据。 对于相关联的天线对，校准数据优选地包括作为与公共参考平面的频率和角度的函数的测量的相对幅度（电磁场强度）和相位数据。 该校准数据存储在PROM中，PROM优选地设置在包括天线对的组件内。 系统处理器然后可以在系统操作期间检索校准数据，从而可以提高准确度来进行到达角测量。
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