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    • 1. 发明授权
    • Portable integrated indoor and outdoor positioning system and method
    • 便携式综合室内外定位系统及方法
    • US06459989B1
    • 2002-10-01
    • US09517897
    • 2000-03-03
    • Michael KirkpatrickJeffrey CasperClay RossD. Scott SeatonChristian GellrichMichael CutterJames Binnion
    • Michael KirkpatrickJeffrey CasperClay RossD. Scott SeatonChristian GellrichMichael CutterJames Binnion
    • G01C200
    • G01S5/0027G01S1/725G01S15/74G01S19/10G01S19/14G01S19/46G01S19/48G01S2205/002
    • An integrated indoor and outdoor positioning system and method. A first communication unit aperiodically emits an ultrasonic signal. A second communication unit receives the ultrasonic signal and transmits an identification signal in response to receiving the ultrasonic signal. One of the two communication units is placed at a predetermined position and the other of the two communication units is placed with an object. Identification information obtained from the identification signal is used to determine position information indicating that the object is at the predetermined position. The first communication unit is placed at the predetermined position and the second communication unit accompanies the object. Alternatively, the first communication unit accompanies the object and the second communication unit is placed at the predetermined position. One of the two communication units may also include a GPS receiver for receiving GPS signals from a plurality of satellites or pseudolites and computing position information therefrom. The GPS receiver applies differential GPS corrections computed by a GPS reference receiver to improve the accuracy of the position information. Position information is transmitted to a base station over an assigned radio frequency and during a time slot allocated to the communication unit that is transmitting the position information.
    • 一体化室内外定位系统及方法。 第一通信单元非周期性地发射超声波信号。 第二通信单元接收超声波信号并且响应于接收到超声波信号而发送识别信号。 两个通信单元中的一个被放置在预定位置,并且两个通信单元中的另一个放置有对象。 使用从识别信号获得的识别信息来确定表示物体在预定位置的位置信息。 第一通信单元被放置在预定位置,并且第二通信单元伴随对象。 或者,第一通信单元伴随对象,并且第二通信单元被放置在预定位置。 两个通信单元中的一个还可以包括用于从多个卫星或伪卫星接收GPS信号并从其计算位置信息的GPS接收器。 GPS接收机应用由GPS参考接收机计算的差分GPS校正,以提高位置信息的准确性。 位置信息通过分配的射频以及分配给发送位置信息的通信单元的时隙发送到基站。
    • 2. 发明申请
    • Method and apparatus for updating information in a low-bandwidth client/server object-oriented system
    • 用于在低带宽客户端/服务器面向对象系统中更新信息的方法和装置
    • US20070078978A1
    • 2007-04-05
    • US11633128
    • 2006-11-30
    • James ArnoldD. Scott SeatonCarla WoodworthMichael FrandsenNathan Williams
    • James ArnoldD. Scott SeatonCarla WoodworthMichael FrandsenNathan Williams
    • G06F15/16
    • H04L67/14H04L47/10H04L67/327
    • Methods and apparatus for efficiently maintaining updated information on client/server object-oriented computing systems are disclosed. In accordance with one aspect of the present invention, a method for transmitting a packet of data from a first computing system to a second computing system in a client/server object-based computing system includes identifying the packet of data using the first computing system and attempting to send the packet of data from the first computing system to the second computing system. Once the attempt is made to send the packet of data, it is determined whether the packet of data is received by the second computing system. An acknowledgment is sent from the second computing system to the first computing system when it is determined that the packet of data is received by the second computing system. The acknowledgement indicates that the packet of data is received by the second computing system. In one embodiment, the method includes re-attempting to send the packet of data from the first computing system to the second computing system when the packet of data is not successfully received by the second computing system.
    • 公开了用于有效维护客户/服务器面向对象计算系统上的更新信息的方法和装置。 根据本发明的一个方面,一种用于在基于客户端/服务器对象的计算系统中将数据分组从第一计算系统传输到第二计算系统的方法包括:使用第一计算系统识别数据包;以及 尝试将数据包从第一计算系统发送到第二计算系统。 一旦尝试发送数据包,就确定数据包是否被第二计算系统接收。 当确定数据分组被第二计算系统接收时,确认从第二计算系统发送到第一计算系统。 确认指示数据包被第二计算系统接收。 在一个实施例中,当数据分组未被第二计算系统成功接收时,该方法包括重新尝试将数据分组从第一计算系统发送到第二计算系统。