Long-distance RF frequency and time transfer

Thomas Fordell (Inventor)

    Research output: PatentPatent


    In an aspect, an apparatus for distribution of frequency reference to a receiving end over a transmission medium comprises a first mixer adapted to mix a frequency reference signal having a reference frequency with a local oscillator signal having a local oscillator frequency to provide a forward frequency reference signal, a communication section adapted to transmit the forward frequency reference signal and receive a first backward frequency reference signal, a second mixer adapted to mix the first backward frequency reference signal with the local oscillator signal to provide a second backward frequency reference signal and a phase comparator and control circuit adapted to adjust the local oscillator frequency based on a phase shift of the second backward frequency reference signal so as to compensate for a phase shift of the forward frequency reference signal.

    Patent family as of15.12.2021
    DE602018026580 D1 20211125 DE201860026580T 20180920      
    EP3685529 A1 20200729 EP20180789459 20180920      
    EP3685529 B1 20211110 EP20180789459 20180920      
    FI129033 B 20210531 FI20170005838 20170921      
    FI20175838 A 20190322 FI20170005838 20170921      
    US10911145 BB 20210202 US20200648418 20180920      
    US2020266895 AA 20200820 US20200648418 20180920      
    WO19058028 A1 20190328 WO2018FI50679 20180920

    Link to currentpatent family on right 

    Original languageEnglish
    Patent numberUS2020266895
    IPCH04L 7/ 00 A I
    Priority date20/09/18
    Publication statusPublished - 20 Aug 2020
    MoE publication typeH1 Granted patent


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