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4 records (took 0.023 seconds)

    2.
    发明专利
    未知

    公开(公告)号：AT474389T

    公开(公告)日：2010-07-15

    申请号：AT07124129

    申请日：2004-12-27

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： KIM BYOUNG-HAK ,  LEE HO-JIN ,  KIM HO-KYOM ,  OH DEOCK-GIL

    IPC: H04J3/06 ,  H04L7/00 ,  H04L7/033 ,  H04N7/24

    Abstract: A reference clock recovery apparatus is provided and includes a tuning unit for receiving a modulated signal and converting the modulated signal into a digital value; a first frequency difference detecting unit for detecting a frequency difference between the central station and a terminal; first and second filtering unit for smoothing the frequency difference; a second frequency difference detecting unit for causing the terminal to maintain a synchronization to the cl.ock of the central station; a switching unit for selecting an operation of the first frequency difference detecting unit or an operation of the second frequency difference detecting unit; an digital-to-analog converting unit for converting a digital signal into an analog signal; an oscillating unit for receiving an output of the digital-to-analog converting unit and outputting a desired frequency; a counting unit for counting the clocks and outputting the count value; and a transmitting unit for transmits the timing information.

    Deciding a transmission path for the terminal of a satellite communication system
    4.
    发明专利
    Deciding a transmission path for the terminal of a satellite communication system 未知

    公开(公告)号：GB2433179A

    公开(公告)日：2007-06-13

    申请号：GB0624657

    申请日：2006-12-11

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： KIM BYOUNG-HAK ,  OH DEOCK-GIL ,  LEE HO-JIN ,  RYU JOON-GYU

    IPC: H04Q7/38 ,  H04B7/185

    Abstract: In the invention a selector determines whether transmissions from the terminal should be direct to a satellite, or indirectly via a "gap filler" relay, the decision being made by comparing the respective link qualities. As embodied, the terminal has a Ku/Ka band antenna and signals received from the satellite are converted to S-band 303. The converted signals are then monitored 307 for S/N level and compared 308 with the S/N level of S-band signals received from the gap filler. The comparison results controls an RF switch which selects the link with the greater S/N level.

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