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    Satellite Receiver Having Doppler Frequency Shift Tracking
    1.
    发明专利
    Satellite Receiver Having Doppler Frequency Shift Tracking 未知

    公开(公告)号：CA2180143A1

    公开(公告)日：1995-07-20

    申请号：CA2180143

    申请日：1995-01-12

    Applicant: MOTOROLA INC

    Inventor： SIWIAK KAZIMIERZ ,  PONCE DE LEON LORENZO A

    IPC: H04B7/01 ,  H04B7/185 ,  H04L27/227 ,  H04B7/195

    Abstract: A satellite receiver system provides acquisition and frequency tracking of a Doppler-shifted radio signal received from an orbiting satellite. The satellite receiver system includes a Costas phase-lock loop that receives the radio signal and provides an error signal at an error signal output for controlling a conversion frequency generated by a voltage controlled oscillator. The voltage controlled oscillator is coupled to the Costas phase-lock loop and generates the conversion frequency for down-converting the radio signal in the Costas phase-lock loop. The satellite receiver system further includes a Doppler frequency acquisition and tracking element coupled to the voltage controlled oscillator. The Doppler frequency acquisition and tracking element adjusts the conversion frequency to compensate for a Doppler frequency shift occurring in the radio signal due to orbital motion of the orbiting satellite.

    SATELLITE RECEIVER SYSTEM HAVING DOPPLER FREQUENCY SHIFT TRACKING
    4.
    发明专利
    SATELLITE RECEIVER SYSTEM HAVING DOPPLER FREQUENCY SHIFT TRACKING 未知

    公开(公告)号：CA2180143C

    公开(公告)日：2000-10-24

    申请号：CA2180143

    申请日：1995-01-12

    Applicant: MOTOROLA INC

    Inventor： SIWIAK KAZIMIERZ ,  PONCE DE LEON LORENZO A

    IPC: H04B7/01 ,  H04B7/185 ,  H04L27/227 ,  H04B7/195

    Abstract: A satellite receiver system (400) provides acquisition and frequency tracking of a Doppler-shifted radio signal received from an orbiting satellite. The satellite receiver system (400) includes a Costas phase-lock loop (100) that receives the radio signal and provides an error signal at an error signal output (134) for controlling a conversion frequency generated by a voltage controlled oscillator (200). The voltage controlled oscillator (200) is coupled to the Costas phase-lock loop (100) and generates the conversion frequency for downconverting the radio signal in the Costas phase-lock loop (100). The satellite receiver system (400) further includes a Doppler frequency acquisition and tracking element (300) coupled to the voltage controlled oscillator (200). The Doppler frequency acquisition and tracking element (300) adjusts the conversion frequency to compensate for a Doppler frequency shift occuring in the radio signal due to orbital motion of the orbiting satellite.

    ANTENNA STRUCTURE FOR DEVICES WITH CONDUCTIVE CHASSIS
    8.
    发明公开
    ANTENNA STRUCTURE FOR DEVICES WITH CONDUCTIVE CHASSIS 有权
    天线结构与导电性底盘DEVICES

    公开(公告)号：EP1690407A4

    公开(公告)日：2009-01-14

    申请号：EP04811835

    申请日：2004-11-22

    Applicant: MOTOROLA INC

    Inventor： PONCE DE LEON LORENZO A ,  CANDAL ALEJANDRO ,  CHENOWETH JOHN P ,  MINASI DAVID H

    IPC: H04M1/00 ,  H01Q1/24 ,  H04M20060101 ,  H04Q7/20

    CPC classification number: H01Q1/243

    Abstract: A multiband element antenna (120) used in combination with a unique metal chassis design that enhances antenna performance and that enables the design of a compact and efficient antenna system. A cellular flip phone (100) that has a conductive chassis includes a flip up antenna (120) that pivots between an extended and a retracted position. The antenna (120) pivots at a point that is located on one edge of the top of the cell phone body (102). The conductive chassis of the flip cover (104) is grounded to the flip phone body (102) at a single point or single surface that is substantially opposite the antenna RF feed (122). Conductive surfaces of the cellular flip phone body (102) are grounded at a single point that is near the antenna RF feed point (122). This grounding arrangement has been found to control the flow of induced currents on the conductive portions of the flip cover (104) and body (102), thereby improving the performance of the device's antenna (120).

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