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113 条记录 (耗时 0.012 秒)

    RANGE-GATED FIELD DISTURBANCE SENSOR WITH RANGE-SENSITIVITY COMPENSATION
    35.
    发明公开
    RANGE-GATED FIELD DISTURBANCE SENSOR WITH RANGE-SENSITIVITY COMPENSATION 失效
    随着距离的传感器选择，拆迁连带赔偿场问题

    公开(公告)号：EP0779992A4

    公开(公告)日：1999-05-06

    申请号：EP95931036

    申请日：1995-08-29

    申请人： UNIV CALIFORNIA

    发明人： MCEWAN THOMAS E

    IPC分类号： G01V3/12 ,  G01S7/40 ,  G01S13/02 ,  G01S13/04 ,  G01S13/18 ,  G01S13/32 ,  G01S13/34 ,  G01S13/56 ,  G08B13/181

    CPC分类号： A61B5/0507 ,  G01S13/0209 ,  G01S13/18 ,  G01S13/348 ,  G01S13/56

    摘要： A field disturbance sensor operates with a relatively low power, provides an adjustable operating range, is not hypersensitive at close range, allows co-location of multiple sensors, and is inexpensive to manufacture. The sensor includes a transmitter (11) that transmits a sequence of bursts (19) of electromagnetic energy. The transmitter frequency is modulated at an intermediate frequency. The sequence of bursts has a burst repetition rate, and each burst has a burst width and comprises a number of cycles at a transmitter frequency. The sensor includes a receiver (21) which receives electromagnetic energy at the transmitter frequency, and includes a mixer (22) which mixes a transmitted burst with reflections of the same transmitted burst to produce an intermediate frequency signal. Circuitry, responsive to the intermediate frequency signal indicates disturbances in the sensor field. The burst repetition rate is randomly or pseudo-randomly modulated so that bursts in the sequence of bursts have a phase which varies.

    SYSTEM AND METHOD FOR FACILITATING DETECTING AN UNAUTHORIZED ACCESS TO AN OBJECT
    39.
    发明公开
    SYSTEM AND METHOD FOR FACILITATING DETECTING AN UNAUTHORIZED ACCESS TO AN OBJECT 审中-公开

    公开(公告)号：EP4095818A1

    公开(公告)日：2022-11-30

    申请号：EP21176376.8

    申请日：2021-05-27

    申请人： NXP B.V.

    发明人： CASAMASSIMA, Filippo ,  EBER, Wolfgang

    IPC分类号： G08B13/08 ,  G08B29/18 ,  B60R25/10 ,  G08B13/181

    摘要： In accordance with a first aspect of the present disclosure, a system is provided for facilitating detecting an unauthorized access to an object, the system comprising: a plurality of ultra-wideband (UWB) communication nodes; a controller operatively coupled to said plurality of UWB communication nodes, wherein the controller is configured to: cause at least one of the UWB communication nodes to transmit one or more UWB messages to other UWB communication nodes of said plurality of UWB communication nodes; receive a channel impulse response (CIR) estimate and/or one or more parameters relating to said CIR output by the UWB communication nodes in response to receiving said UWB messages; analyze said CIR estimate and/or said parameters relating to the CIR to detect said unauthorized access to the object. In accordance with a second aspect of the present disclosure, a corresponding method is conceived for facilitating detecting an unauthorized access to an object. In accordance with a third aspect of the present disclosure, a computer program is provided for carrying out said method.

    WIRELESS SLIDE FENCE SYSTEM AND METHOD
    40.
    发明公开
    WIRELESS SLIDE FENCE SYSTEM AND METHOD 审中-公开

    公开(公告)号：EP3939856A2

    公开(公告)日：2022-01-19

    申请号：EP21185523.4

    申请日：2021-07-14

    申请人： BNSF Railway Company

    发明人： Wayne Beard, Mitchell ,  Chiyang Shih, Paul ,  Weidle, Paul Aaron ,  Specht, Jerry Wade ,  Shue, Kent Robert

    IPC分类号： B61L23/04 ,  B61L1/18 ,  G08B21/02 ,  G08B29/18 ,  G01S15/931 ,  G08B13/16 ,  G08B13/181

    摘要： A Wireless Slide Fence utilizing signal reflection technology to detect rockslides and can determine the size and location of fallen rocks/objects impeding travel along a train track is presented. The present disclosure solves the technological problem of determining rock size and location to validate rockslide/fall alarms to reduce false alarms, while minimizing repairs required by conventional systems through the use of obstacle detection units and vital logic controllers. The present disclosure improves the performance of the system by, generating validated alarms when fallen rocks/objects satisfy the size criteria and are located in an area hazardous to train operations. In one exemplary embodiment, a loitering time can be implemented to validate object detections to reduce false positives due to transient objects such as migrating animals.