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    • 5. 发明授权
    • Asset location system
    • 资产定位系统
    • US6069570A
    • 2000-05-30
    • US932878
    • 1997-09-18
    • Russell M. Herring
    • Russell M. Herring
    • G01S5/00G01S5/14G01S19/09G01S19/27G08G1/127H04M11/04G08B5/22
    • G01S19/34G01S1/045G01S19/14G08G1/127H04M11/04G01S2205/002G01S2205/008G01S5/0027
    • An asset location system includes a pager, a control processor, a GPS receiver and a cell phone. During normal operation, the equipment on board the tracked asset is in a low power or sleep mode. Upon receiving a location quaere from a call center, a signal or control processor is powered up. If location information is to be obtained from a particular asset, a GPS receiver obtains latitude and longitude information. This latitude and longitude information is put in a transmittable form by a modem. A cellular telephone module then transmits this information to a remote monitoring or response center. If desired, data reporting on asset condition may also be sent the remote monitoring or response center along with the location information.
    • 资产定位系统包括寻呼机,控制处理器,GPS接收器和手机。 正常运行时,跟踪资产上的设备处于低功耗或睡眠模式。 在从呼叫中心接收到位置信号时,信号或控制处理器被加电。 如果要从特定资产获得位置信息,则GPS接收器获得纬度和经度信息。 这个纬度和经度信息由调制解调器以可传输的形式提供。 蜂窝电话模块然后将该信息发送到远程监视或响应中心。 如果需要,也可以向远程监控或响应中心发送关于资产状况的数据报告以及位置信息。
    • 7. 发明授权
    • Left-hand circular polarized antenna for use with GPS systems
    • 用于GPS系统的左旋圆极化天线
    • US06211823B1
    • 2001-04-03
    • US09234566
    • 1999-01-20
    • Russell M. Herring
    • Russell M. Herring
    • H01Q138
    • H01Q9/0428H01Q1/3233H01Q21/26
    • An antenna system, comprising a left-hand circular polarized antenna, is disclosed for use in receiving signals from a GPS location satellite which are originally-transmitted as RHCP signals. Reception occurs after the right-hand circular polarized signal is reflected, or bounces off of, a surface one or more times. The number of reflections must be an odd number. The left-hand circular polarized antenna may be mounted underneath a vehicle or a building overhang. The method of the invention comprises the steps of transmitting a right-hand circular polarized signal and receiving the signal using a left-hand circular polarized antenna placed in a location where the right-hand circular polarized signal must be reflected by an odd number of surfaces before reception.
    • 公开了一种包括左旋圆极化天线的天线系统,用于从原始作为RHCP信号发送的GPS定位卫星接收信号。 接收发生在右手圆偏振信号被反射或反弹一次或多次之后。 反射次数必须是奇数。 左侧圆形极化天线可以安装在车辆下方或建筑物的悬垂端。 本发明的方法包括以下步骤:发送右旋圆极化信号,并使用放置在右圆圆极化信号必须反射奇数表面的位置的左旋圆极化天线接收信号 在接待前。
    • 8. 发明授权
    • Cellular telephone communication protocol
    • 蜂窝电话通信协议
    • US06414969B1
    • 2002-07-02
    • US09583079
    • 1999-06-02
    • Russell M. Herring
    • Russell M. Herring
    • H04Q700
    • H04J3/1682H04W76/20
    • A cellular telephone communication protocol enables a communication link primarily for the transmission of voice and data. At predetermined intervals or on-demand data regarding location, an event, or a condition is sent by muting the voice audio and sending a data frame having a pre-determined sequence. Following the transmission of the location, event, or condition data transmission of voice is resumed. The communication link of the preferred embodiment uses a half duplex, frequency shift, keying modulation technique. However, other modulation techniques may be used.
    • 蜂窝电话通信协议使通信链路主要用于语音和数据的传输。 以关于位置的预定间隔或按需数据,通过使语音音频静音并发送具有预定序列的数据帧来发送事件或条件。 在发送位置,事件或条件数据传输语音后,恢复。 优选实施例的通信链路使用半双工,频移,键控调制技术。 然而,可以使用其他调制技术。