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    • 7. 发明授权
    • System and method for CDMA geolocation
    • CDMA地理位置的系统和方法
    • US07429914B2
    • 2008-09-30
    • US11008154
    • 2004-12-10
    • John Peter CarlsonThomas Booker GravelyJoseph P. KennedyJames T. McDaniel, Jr.
    • John Peter CarlsonThomas Booker GravelyJoseph P. KennedyJames T. McDaniel, Jr.
    • G09F25/00H04Q7/00G08C19/00
    • H04W64/00G01S5/06H04W4/02
    • A system and method is disclosed for determining the location of a mobile appliance using the reverse pilot channel provided in CDMA 2000 communication systems to determine an attribute (e.g., time of arrival, angle of arrival, time difference of arrival, received power level) of a reverse pilot signal at one or more wireless location sensors. A network overlay of wireless location sensors monitors the reverse pilot channel for a target mobile's reverse pilot signal. The monitored signal may be compared to a reference signal to determine a correlation and thereby determine an attribute of the target mobile's reverse pilot signal. The method may be performed independently from the communication system and without requiring retrieval of information bits from the mobile appliance. The reference signal may be generated from the unique long spreading code mask of the target mobile appliance which is typically a function of the ESN of the target mobile appliance.
    • 公开了一种用于使用CDMA 2000通信系统中提供的反向导频信道确定移动设备的位置的系统和方法,以确定属性(例如,到达时间,到达时间,到达时间差,接收功率电平) 在一个或多个无线位置传感器处的反向导频信号。 无线位置传感器的网络覆盖监视目标移动台的反向导频信号的反向导频信道。 所监视的信号可以与参考信号进行比较,以确定相关性,从而确定目标移动台的反向导频信号的属性。 该方法可以独立于通信系统执行,而不需要从移动设备检索信息位。 参考信号可以从目标移动设备的唯一的长扩展码掩码生成,其通常是目标移动设备的ESN的函数。
    • 8. 发明授权
    • System and method for analog cellular radio geolocation
    • 用于模拟蜂窝无线电定位的系统和方法
    • US06845240B2
    • 2005-01-18
    • US10011783
    • 2001-12-11
    • John Peter CarlsonThomas Booker GravelyJoseph P. Kennedy, Jr.
    • John Peter CarlsonThomas Booker GravelyJoseph P. Kennedy, Jr.
    • G01S5/00G01S5/06H04B7/08H04Q7/20
    • G01S5/0081G01S5/06H04B7/086
    • A system and method for determining the geolocation of autonomous mobile appliances emitting analog waveforms is disclosed. More specifically, the inventive system and method is used to geolocate FM analog signals such as those used in the AMPS cellular radio air standard by using a time difference of arrival (“TDOA”) approach. The inventive system and method uses a novel approach to minimize the amount of data sent between location sensors and the central location processor comprising adaptive signal combining from N channel to a single channel, FM demodulation to reduce bandwidth, Fourier transformation for signal compression, and segmentation of the location sensors into primary and secondary modes to allow for parallel processing to ease the computational burden on the central location processor.
    • 公开了一种用于确定发射模拟波形的自主移动设备的地理定位的系统和方法。 更具体地,本发明的系统和方法用于通过使用到达时差(“TDOA”)方法来对诸如在AMPS蜂窝无线电空中标准中使用的FM模拟信号进行地理定位。 本发明的系统和方法使用新颖的方法来最小化在位置传感器和包括从N个信道到单个信道的自适应信号组合的FM中央位置处理器之间发送的数据量,FM解调以减少带宽,用于信号压缩的傅里叶变换和分段 的位置传感器进入主模式和次模式,以允许并行处理以缓解中央位置处理器的计算负担。