METHOD FOR DISTINGUISHING A SIGNAL AND ITS IMAGE

    公开(公告)号:US20230160947A1

    公开(公告)日:2023-05-25

    申请号:US17531737

    申请日:2021-11-20

    申请人: Ling Tong

    发明人: Ling Tong

    IPC分类号: G01R31/28

    CPC分类号: G01R31/2822

    摘要: The method is for identifying a signal and its image signal input to the heterodyne frequency sweep system. Comparing to a traditional heterodyne frequency sweep technology, a mixing module with a positive and negative sign filters (PNS filters) is introduced, and the detection and identification module is added, and the typical low-pass filter in the input module is removed. According to the timing order sequence of the signal output from the intermediate frequency (IF) filter and PNS filters, a signal and its image signal can be identified. The bandwidth of the heterodyne frequency sweep system is not limited by the cut-off frequency of the low-pass filter (LPF) of the traditional heterodyne frequency sweep system.