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    • 23. 发明授权
    • Local communication network for power reduction and enhanced reliability
in a multiple node tracking system
    • 多节点跟踪系统的本地通信网络,用于降低功率并提高可靠性
    • US5691980A
    • 1997-11-25
    • US484750
    • 1995-06-07
    • Kenneth Brakeley Welles, IIJerome Johnson TiemannSandeep ChennakeshuHarold Woodruff Tomlinson, Jr.
    • Kenneth Brakeley Welles, IIJerome Johnson TiemannSandeep ChennakeshuHarold Woodruff Tomlinson, Jr.
    • G01C21/00B61L25/02G01S5/00G01S19/03G01S19/21G07C5/00G08B25/04G08G1/127H04B7/212H04L12/28H04B7/185
    • H04W84/20B61L25/021B61L25/025G01S5/0027G08G1/127B61L2205/04G01S2205/002Y02B60/50
    • A mobile local area network (LAN) of tracked assets utilizing minimal power and bandwidth allows a large number of assets to be tracked in a practical manner. The mobile LAN is established between a plurality of tracking units in close proximity. Assets are approximately located according to their connection in the mobile LAN where the exact location of at least one of the network nodes is known. Each tracked asset has capability to independently determine and report its position to a central station, and each asset also has capability to communicate locally with other cooperative assets via the LAN. The LAN is dynamically reconfigurable so that as other cooperative assets come into proximity, they can join the network, and as others move away, they can leave the network. Within the network, a protocol is followed which assigns one of the assets to be the "master" and all others to be "slaves". The master asset takes responsibility for determining its own exact geographical position via LORAN, OMEGA, Global Positioning System (GPS) or other navigational aid. When connected in a LAN, slave assets report their ID to the master asset and do not determine their own locations in order to conserve power. The master reports its location and ID, as well as the IDs of the other assets in the LAN, to the central station. Uncertainty in the location of a slave asset is limited by the known possible geographical extent of the LAN which is known a priori.
    • 使用最小功率和带宽的跟踪资产的移动局域网(LAN)允许以实际的方式跟踪大量资产。 在紧邻的多个跟踪单元之间建立移动LAN。 资产大致上根据它们在移动LAN中的连接而定位,其中至少一个网络节点的确切位置是已知的。 每个跟踪资产都有能力独立地确定并向中心站报告其位置,每个资产还具有通过局域网与其他合作资产进行本地通信的能力。 LAN可动态重新配置,以便随着其他合作资产的接近,他们可以加入网络,而随着其他人的移动,他们可以离开网络。 在网络中,遵循一个协议,将一个资产分配为“主”,所有其他资源都将作为“从属”。 主资产负责通过LORAN,OMEGA,全球定位系统(GPS)或其他导航辅助来确定其自己的确切地理位置。 当连接到局域网时,从属资产将其ID标识为主资产,并且不确定自己的位置以节省电力。 主人将其位置和ID以及LAN中其他资产的ID报告给中心站。 从属资产位置的不确定性受到先验已知的LAN已知可能的地理范围的限制。
    • 28. 发明授权
    • System and method for detecting rail break or vehicle
    • 检测铁路车辆或车辆的系统和方法
    • US07226021B1
    • 2007-06-05
    • US11318970
    • 2005-12-27
    • Todd Alan AndersonKenneth Brakeley Welles, II
    • Todd Alan AndersonKenneth Brakeley Welles, II
    • B61L23/04B61L25/00G01R31/08
    • B61L23/044B61L1/181
    • A rail break or vehicle detection system includes a plurality of voltage sources, each coupled to one of the plurality of zones. A plurality of resistors are provided, each coupled in series with one of the plurality of voltage sources. A plurality of current sensors are provided, each coupled to one of the plurality of resistors and adapted to measure a first set of values and second set of values indicative of current flowing through the resistor. At least one control unit is adapted to receive input from the plurality of current sensors and to compare a difference between the second set of values and the first set of values to a predetermined threshold limit to detect presence of a rail vehicle on the block. The control unit is further adapted to switch a polarity of each voltage source.
    • 轨道断路或车辆检测系统包括多个电压源,每个电压源耦合到多个区域之一。 提供多个电阻器,每个电阻器与多个电压源中的一个串联耦合。 提供多个电流传感器,每个电流传感器分别耦合到多个电阻器中的一个并且适于测量指示电流流过电阻器的电流的第一组值和第二组值。 至少一个控制单元适于接收来自多个电流传感器的输入,并且将第二组值与第一组值之间的差值比较至预定阈值极限,以检测轨道车辆在该块上的存在。 控制单元还适于切换每个电压源的极性。