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    Moving target indicating system
    2.
    发明授权
    Moving target indicating system 失效
    移动目标指示系统

    公开(公告)号：US3555548A

    公开(公告)日：1971-01-12

    申请号：US3555548D

    申请日：1961-02-17

    申请人： RAYTHEON CO

    发明人： WYCKOFF ROBERT L

    IPC分类号： G01S13/53 ,  G01S13/62 ,  G01S9/44 ,  G01R23/00

    CPC分类号： G01S13/62 ,  G01S13/53

    摘要： A COHERENT MTI RADAR SYSTEM WHEREIN A DOPPLER VIDEO SIGNAL IS PROCESSED IN A MANNER SUCH THAT AN INDICATION IS PROVIDED OF WHETHER A TARGET IS APPROACHING OR RECEDING RELATIVE TO THE RADAR SYSTEM. THE PROCESSING IS ACCOMPLISHED BY FORMING TWO SIGNALS, THE FIRST OF WHICH IS GENERATED BY MIXING THE DOPPLER VIDEO SIGNAL WITH A REFERENCE FREQUENCY SIGNAL, THE SECOND OF WHICH IS GENERATED BYH MIXING THE DOPPLER VIDEO SIGNAL WITH THE QUADRATURE PHASE COMPONENT OF THE REFERENCE FREQUENCY SIGNAL. THE TWO SIGNALS ARE FILTERED AND AN ADDITIONAL 90* PHASE SHIFTER IS ADDED BETWEEN THE TWO SIGNALS. THE TWO SIGNALS ARE THEN COMBINED IN A SUMMING CIRCUIT AND A SUBSTRACTING CIRCUIT SUCH THAT THE SIGNAL PRODUCED BY THE SUMMING/SUBSTRACTING CIRCUITS PROVIDES AN INDICATION OF AN APPROACHING OR RECORDING TARGET.