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    Accurate timing distribution by high-frequency radio
    1.
    发明授权
    Accurate timing distribution by high-frequency radio 有权

    公开(公告)号：US10148345B2

    公开(公告)日：2018-12-04

    申请号：US14341093

    申请日：2014-07-25

    Applicant: Massachusetts Institute of Technology

    Inventor： Frank C. Robey

    IPC: H04B7/22 ,  G01S11/02 ,  G01S13/02

    Abstract: A method of obtaining an absolute time reference for a high-frequency (HF) sounding signal includes transmitting a reference signal at a first location and transmitting a sounding signal in close proximity to the transmitting of the reference signal at the first location. The method additionally includes receiving the reference signal at a second location and receiving the sounding signal at the second location. The method further includes determining a relative delay at the second location of the sounding signal in relation to the reference signal. The method also includes determining a propagation mode based upon the relative delay. The method additionally includes determining an absolute time reference based upon the propagation mode being observed. Additional methods and associated systems for implementing the methods are also provided.

    Digital matching of a radio frequency antenna
    4.
    发明授权
    Digital matching of a radio frequency antenna 有权

    公开(公告)号：US09825659B2

    公开(公告)日：2017-11-21

    申请号：US14916376

    申请日：2015-06-02

    Applicant: Massachusetts Institute of Technology

    Inventor： Frank C. Robey ,  Timothy M. Hancock ,  Gregory B. Stahl

    IPC: H04B1/10 ,  H04B17/21 ,  H04B17/336 ,  H04B1/18

    CPC classification number: H04B1/1027 ,  H04B1/18 ,  H04B17/21 ,  H04B17/336

    Abstract: A matching technique that may be used with electrically small antennas uses one or more digital circuit blocks connected in a feedback arrangement configured to tune the transfer function response between the antenna and an output port of the system. Each circuit block may include an analog-to-digital converter (ADC), a digital filter, and a digital-to-analog converter (DAC). As such, tuning the transfer function may be achieved by sensing a voltage or current at various circuit nodes using one or more ADCs, filtering the measurements in response-shaping digital filters, and using one or more DACs to drive other circuit nodes in a manner that elicits a desired circuit response. Techniques are provided for allowing a matched antenna to adapt to a changing environment about the antenna. In one illustrative embodiment, the digital circuit blocks may be provided as digital non-Foster circuit blocks.

    Digital Matching Of A Radio Frequency Antenna
    5.
    发明申请
    Digital Matching Of A Radio Frequency Antenna 有权
    射频天线的数字匹配

    公开(公告)号：US20160218759A1

    公开(公告)日：2016-07-28

    申请号：US14916376

    申请日：2015-06-02

    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

    Inventor： Frank C. Robey ,  Timothy M. Hancock ,  Gregory B. Stahl

    IPC: H04B1/10 ,  H04B17/21 ,  H04B17/336 ,  H04B1/18

    CPC classification number: H04B1/1027 ,  H04B1/18 ,  H04B17/21 ,  H04B17/336

    Abstract: A matching technique that may be used with electrically small antennas uses one or more digital circuit blocks connected in a feedback arrangement configured to tune the transfer function response between the antenna and an output port of the system. Each circuit block may include an analog-to-digital converter (ADC), a digital filter, and a digital-to-analog converter (DAC). As such, tuning the transfer function may be achieved by sensing a voltage or current at various circuit nodes using one or more ADCs, filtering the measurements in response-shaping digital filters, and using one or more DACs to drive other circuit nodes in a manner that elicits a desired circuit response. Techniques are provided for allowing a matched antenna to adapt to a changing environment about the antenna. In one illustrative embodiment, the digital circuit blocks may be provided as digital non-Foster circuit blocks.

    Abstract translation: 可以与电小天线一起使用的匹配技术使用一个或多个以反馈布置连接的数字电路块，其被配置为调整天线与系统的输出端口之间的传递函数响应。 每个电路块可以包括模数转换器（ADC），数字滤波器和数模转换器（DAC）。 因此，可以通过使用一个或多个ADC来感测各个电路节点处的电压或电流，在响应整形数字滤波器中滤波测量，以及以一种或多种DAC驱动其它电路节点来实现调谐传递函数 引起所需的电路响应。 提供技术用于允许匹配的天线适应关于天线的变化的环境。 在一个说明性实施例中，数字电路块可以被提供为数字非福斯特电路块。

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