Compressional/shear wave separation in vertical seismic profiling
    1.
    发明授权
    Compressional/shear wave separation in vertical seismic profiling 失效
    垂直地震剖面中的压缩/剪切波分离

    公开(公告)号:US4648039A

    公开(公告)日:1987-03-03

    申请号:US567359

    申请日:1983-12-30

    摘要: Disclosed is separation of the compressional and shear components of the wavefield measured in 3-component vertical seismic profiling. The separation involves working in the zx plane defined by the borehole axis (z) and the surface seismic source, and in successive and overlapping windows each defined by (i) a depth interval centered at the depth level currently being processed and including several depth levels above and below and (ii) a time interval sufficiently long to include the receipt of the relevant seismic energy by the geophones. The total wavefield measurements in a window are rotated to give the energy along the borehole axis (z) and that perpendicular to it in the zx plane of interest, the result is forward Fourier transformed in two dimensions, then filtered in wavenumber-frequency space by means of a matrix filter which depends on previously estimated compressional and shear speeds of the region that produced the VSP measurements being filtered, and the result is inverse Fourier transformed to derive the compressional component. Subtracting the compressional component from the total measured wavefield gives the shear component. The corresponding operations performed entirely in the spatial domain give corresponding results.

    摘要翻译: 公开了在三分量垂直地震剖面中测量的波场的压缩和剪切分量的分离。 分离涉及在由钻孔轴线(z)和表面地震源定义的zx平面中以及在连续和重叠的窗口中工作,每个窗口由(i)以当前正在处理的深度级为中心的深度间隔定义,并且包括几个深度级 (ii)足够长的时间间隔,以包括地震检波器接收相关的地震能量。 旋转窗口中的总波场测量值以沿钻孔轴线(z)提供能量,并在垂直于目标的zx平面中的能量,其结果是二维前向傅里叶变换,然后在波数频率空间中进行滤波 矩阵滤波器的装置,该矩阵滤波器取决于产生正被滤波的VSP测量的区域的先前估计的压缩和剪切速度,并且该结果被逆傅里叶变换以导出压缩分量。 从总测量的波场中减去压缩分量给出剪切分量。 完全在空间域中执行的相应操作给出相应的结果。

    Secure inductively-coupled communications systems
    2.
    发明授权
    Secure inductively-coupled communications systems 有权
    安全感应耦合通信系统

    公开(公告)号:US08909141B2

    公开(公告)日:2014-12-09

    申请号:US13483241

    申请日:2012-05-30

    IPC分类号: H04B5/00

    摘要: Security in inductively coupled communications systems, such as near field communications (NFC), may be improved by restricting signals carrying user data to an authorized data transmission region. Security may be particularly important when the NFC carries financial transaction information or authorization credentials. Scramble signals may be transmitted along with data signals carrying the user data and designed to overshadow the data signals outside of the authorized data transmission region. The scramble signal transceiver may be designed to have a slower decay rate with distance from the transceiver than the data signal. By adjusting the power levels of the scramble signal and the data signal, the authorized data transmission region may be adjusted. Scramble signals may not be required if the data signal strength outside the authorized data transmission region is below the minimum threshold value required by eavesdropping receivers.

    摘要翻译: 电感耦合通信系统(例如近场通信(NFC))中的安全性可以通过将承载用户数据的信号限制到授权的数据传输区域来改进。 当NFC携带金融交易信息或授权凭证时,安全性可能尤为重要。 扰频信号可以与携带用户数据的数据信号一起传输,并被设计为遮蔽授权数据传输区域外部的数据信号。 加扰信号收发器可以被设计为具有比数据信号具有比收发器更远的衰减速率。 通过调整加扰信号和数据信号的功率电平,可以调整授权数据传输区域。 如果授权数据传输区域外的数据信号强度低于窃听接收机所需的最小阈值,则可能不需要扰频信号。

    Compressional/shear wave separation in vertical seismic profiling
    5.
    发明授权
    Compressional/shear wave separation in vertical seismic profiling 失效
    垂直地震剖面中的压缩/剪切波分离

    公开(公告)号:US4870580A

    公开(公告)日:1989-09-26

    申请号:US856608

    申请日:1986-04-25

    IPC分类号: G01V1/28 G01V1/42

    摘要: Disclosed is separation of the compressional and shear components of the wavefield measured in 3-component vertical seismic profiling. The separation involves working in the zx plane defined by the borehole axis (z) and the surface seismic source space therefrom along the x-axis, and in successive and overlapping windows each defined by (i) a depth interval centered at the depth level currently being processed and including several depth levels above and below and (ii) a time interval sufficiently long to allow the relevant seismic wavefield to be measured by the geophones. The total wavefield measurements in a window are rotated to give the wavefield along the borehole axis (z) and that perpendicular to it in the zx plane of interest. In one embodiment, the result is forward Fourier transformed in two dimensions, then filtered in wavenumber-frequency space by means of a matrix filter which depends on previously estimated compressional and shear speeds of the region that produced the VSP measurements being filtered, and the result is inverse Fourier transformed to derive the compressional component. Subtracting the compressional component from the total measured wavefield gives the shear component. The corresponding operations performed entirely in the spatial domain give corresponding results. In another embodiment, better suited to thin beds, the wavefield components along the x-axis and the z-axis are forward Fourier transformed only temporally, in one dimension, the result is filtered in the space-frequency domain with a space-variant filter which can be different for each borehole depth, and the result is inverse-transformed back to the space-time domain to derive the compressional component.

    摘要翻译: 公开了在三分量垂直地震剖面中测量的波场的压缩和剪切分量的分离。 分离涉及在由x轴定义的钻孔轴线(z)和其表面地震源空间中定义的zx平面中工作,以及在连续和重叠的窗口中,每个窗口由(i)以当前深度水平为中心的深度间隔 被处理并包括上下几个深度级别,以及(ii)足够长的时间间隔,以允许地震检波器测量相关的地震波场。 旋转窗口中的总波场测量结果以沿钻孔轴线(z)提供波场,并且在感兴趣的zx平面垂直于波场。 在一个实施例中,结果是二维前向傅里叶变换,然后通过矩阵滤波器在波数频率空间中进行滤波,矩阵滤波器取决于产生正被滤波的VSP测量的区域的先前估计的压缩和剪切速度,结果 被逆傅立叶变换以导出压缩分量。 从总测量的波场中减去压缩分量给出剪切分量。 完全在空间域中执行的相应操作给出相应的结果。 在另一个实施例中,更适合于薄床,沿着x轴和z轴的波场分量在一个维度上仅在时间上进行前向傅里叶变换,结果在空间 - 频率域中用空间变量滤波器 对于每个钻孔深度可以是不同的,并且将结果逆向变换回到时空域以导出压缩分量。

    Method and apparatus for locating objects using parametric inversion
    7.
    发明授权
    Method and apparatus for locating objects using parametric inversion 失效
    使用参数反演来定位物体的方法和装置

    公开(公告)号:US06700381B2

    公开(公告)日:2004-03-02

    申请号:US10117093

    申请日:2002-04-08

    IPC分类号: G01V311

    CPC分类号: G01V3/10 G01V3/15

    摘要: An apparatus for locating a target object using parametric inversion employs a signal injector capable of injecting a signal into the target object, wherein at least a portion of the target object is buried, a magnetic field receiver, a matching processor for matching to a magnetic field received by the magnetic field receiver a parametric magnetic field distribution model corresponding to the target object and at least one other object, and a locating processor for locating the target object using parameters from the parametric magnetic field distribution model. A method for locating a target object using parametric inversion injects a signal into the target object, at least a portion of which is buried, receives a magnetic field radiated from the target object, matches to the received magnetic field a parametric magnetic field distribution model corresponding to the target object and at least one other object, and locates the target object using parameters from the parametric magnetic field distribution model.

    摘要翻译: 用于使用参数反演来定位目标物体的装置采用能够将目标物体注入信号的信号注射器,其中掩埋目标物体的至少一部分,磁场接收器,与磁场匹配的匹配处理器 由所述磁场接收器接收对应于所述目标对象和至少一个其它对象的参数磁场分布模型;以及定位处理器,用于使用来自所述参数磁场分布模型的参数来定位所述目标对象。 使用参数反转来定位目标物体的方法将至少一部分埋入的目标物体的信号注入到从目标物体辐射的磁场中,与接收到的磁场匹配对应的参数磁场分布模型 到目标对象和至少一个其他对象,并使用来自参数磁场分布模型的参数来定位目标对象。

    Method and apparatus for security in a wireless network
    8.
    发明授权
    Method and apparatus for security in a wireless network 有权
    用于无线网络中的安全性的方法和装置

    公开(公告)号:US07751799B2

    公开(公告)日:2010-07-06

    申请号:US11779971

    申请日:2007-07-19

    IPC分类号: H04M1/66

    CPC分类号: H04W12/08 H01Q25/02 H04W16/28

    摘要: The present invention relates to an apparatus and method for preventing unauthorized users from gaining access to a wireless network. A processor allows only data transmissions from the directions of the authorized users to access the network. Data transmissions from other directions are not allowed to access the network. The present invention also relates to a method and apparatus fore transmitting information only in selected directions, while in directions not selected, information cannot be inferred from the transmitted signal or signals.

    摘要翻译: 本发明涉及一种防止未授权用户获取无线网络的装置和方法。 处理器仅允许来自授权用户的指示的数据传输来访问网络。 来自其他方向的数据传输不允许访问网络。 本发明还涉及仅在选定方向发送信息的方法和装置,而在未选择的方向上,不能从所发送的信号或信号中推断出信息。

    Method and apparatus for security in a wireless network
    10.
    发明授权
    Method and apparatus for security in a wireless network 有权
    用于无线网络中的安全性的方法和装置

    公开(公告)号:US07398078B2

    公开(公告)日:2008-07-08

    申请号:US11067441

    申请日:2005-02-25

    IPC分类号: H04Q7/20

    CPC分类号: H04W12/08 H01Q25/02 H04W16/28

    摘要: The present invention relates to an apparatus and method for preventing unauthorized users from gaining access to a wireless network. A processor allows only data transmissions from the directions of the authorized users to access the network. Data transmissions from other directions are not allowed to access the network. The present invention also relates to a method and apparatus fore transmitting information only in selected directions, while in directions not selected, information cannot be inferred from the transmitted signal or signals.

    摘要翻译: 本发明涉及一种防止未授权用户获取无线网络的装置和方法。 处理器仅允许来自授权用户的指示的数据传输来访问网络。 来自其他方向的数据传输不允许访问网络。 本发明还涉及仅在选定方向发送信息的方法和装置,而在未选择的方向上,不能从所发送的信号或信号中推断出信息。