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    • 72. 发明授权
    • Operating GPS receivers in GPS-adverse environment
    • 在GPS不利环境中操作GPS接收机
    • US07733944B2
    • 2010-06-08
    • US12346448
    • 2008-12-30
    • Robert W. Twitchell, Jr.Delia J. Smith
    • Robert W. Twitchell, Jr.Delia J. Smith
    • H04B1/00
    • G01S19/34G01S19/07G01S19/20G01S19/215
    • A system for operating a GPS receiver in a GPS-adverse environment includes a plurality of GPS receivers, a plurality of remote sensor interfaces (RSIs), and a computer management system. The GPS receivers are adapted to determine positional parameters based on the GPS satellite signals. A first set of GPS receivers is able to accurately determine its positional parameters and a second set of GPS receivers is unable to do so. Each RSI is associated with a respective GPS receiver. The RSIs are communication nodes in an ad hoc wireless network. The computer management system identifies a GPS receiver that is not accurately determining its positional parameters, and in response, causes GPS information to be provided from one of the first set of GPS receivers to the identified GPS receiver. The identified GPS receiver then determines its positional parameters accurately using the provided GPS information.
    • 用于在GPS不利环境中操作GPS接收机的系统包括多个GPS接收机,多个远程传感器接口(RSI)和计算机管理系统。 GPS接收机适于基于GPS卫星信号来确定位置参数。 第一组GPS接收机能够准确地确定其位置参数,第二组GPS接收机不能这样做。 每个RSI与相应的GPS接收器相关联。 RSI是自组织无线网络中的通信节点。 计算机管理系统识别出不准确地确定其位置参数的GPS接收机,并且作为响应,使GPS信息从第一组GPS接收机之一提供给所识别的GPS接收机。 所识别的GPS接收机然后使用所提供的GPS信息来准确地确定其位置参数。
    • 73. 发明授权
    • GPS denial device detection and location system
    • GPS拒绝设备检测和定位系统
    • US07574300B2
    • 2009-08-11
    • US11424845
    • 2006-06-16
    • Robert W. Twitchell, Jr.Delia J. Smith
    • Robert W. Twitchell, Jr.Delia J. Smith
    • G01C21/00
    • G01S19/21G01S19/03
    • A system for detecting a GPS denial device includes a plurality of GPS receivers, a plurality of remote sensor interfaces, a gateway, and a computer management system. Each of the plurality of GPS receivers determines positional parameters based on the signals received from the GPS satellites. Each remote sensor interface is associated with a respective GPS receiver such that each remote sensor interface extracts the GPS parameters from a respective GPS receiver. The plurality of remote sensor interfaces and the gateway are communication nodes in an ad hoc wireless network. The gateway receives the extracted GPS parameters from the remote sensor interfaces. The computer management system receives the extracted GPS parameters from the gateway and compares the determined GPS parameters with historical GPS parameters for the plurality of GPS receivers to detect whether an active GPS denial device is present in the vicinity of the system.
    • 用于检测GPS拒绝设备的系统包括多个GPS接收器,多个远程传感器接口,网关和计算机管理系统。 多个GPS接收机中的每一个基于从GPS卫星接收到的信号来确定位置参数。 每个远程传感器接口与相应的GPS接收器相关联,使得每个远程传感器接口从相应的GPS接收器提取GPS参数。 多个远程传感器接口和网关是自组织无线网络中的通信节点。 网关从远程传感器接口接收提取的GPS参数。 计算机管理系统从网关接收提取的GPS参数,并将确定的GPS参数与多个GPS接收机的历史GPS参数进行比较,以检测系统附近是否存在有源GPS拒绝设备。
    • 79. 发明授权
    • Determining presence of radio frequency communication device
    • 确定射频通信设备的存在
    • US08433309B2
    • 2013-04-30
    • US13286363
    • 2011-11-01
    • Robert W. Twitchell, Jr.
    • Robert W. Twitchell, Jr.
    • H04M3/00H04M11/04
    • G06Q10/08G01S13/825H04W84/18Y02D70/10
    • A RF data communication device operates in at least two states. In a first state, the device transmits a response to an RF transmission if specific data therein represents an inquiry as to the presence of one or more RF data communication devices and if specific data therein corresponds to a class maintained by the device. The device does not transmit a response if specific data in the RF transmission is not representative of an inquiry as to the presence of one or more RF data communication devices, or if specific data therein does not correspond to at least one maintained class. In a second state, the device does not transmit a response when specific data is included therein that is representative of an inquiry as to the presence of one or more RF data communication devices and specific data therein corresponds to at least one maintained class.
    • RF数据通信设备在至少两个状态下工作。 在第一状态下,如果其中的特定数据表示关于一个或多个RF数据通信设备的存在的查询以及其中的特定数据是否对应于由该设备维护的类别,则设备向RF传输发送响应。 如果RF传输中的特定数据不代表关于一个或多个RF数据通信设备的存在的询问,或者其中的特定数据不对应于至少一个维护的类别,则该设备不发送响应。 在第二状态下,当特定数据被包含在其中时,该设备不发送响应,该特定数据表示关于一个或多个RF数据通信设备的存在的询问,并且其中的特定数据对应于至少一个维护的类。