| 摘要 |
Received FDM (Frequency Division Multiplex) SCPC (Single Channel Per Carrier) signals are usually converted into intermediate frequency band signals and then transformed into TDM (Time Division Multiplex) signals by an FDM-TDM transforming device which uses a chirp filter. The FDM-TDM transforming device has a chirp signal generating circuit, a mixer for multiplying the FDM SCPC signals by the chirp signal, and a chirp filter which receives outputs of the mixer and feeds out TDM signals. The FDM SCPC signals are frequency-swept by the chirp signal at the mixer and then applied to the chirp filter. The individual FDM frequency-swept signals applied to the chirp filter are outputted after being compressed to time locations each being assigned to a different sweep frequency.
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