| 摘要 |
A method for the decoding of a signal in an interrogation/response type of communications system, the received signal being formed by a video signal and a signal containing the data, wherein the method comprises at least the following steps: 1) transposing the received data signal to an intermediate frequency Fl to obtain the signal S<SUB>dh</SUB>(Fl), S<SUB>db</SUB>(Fl), 2) converting the intermediate frequency analog signal into a digital signal, 3) sampling the digital signal S<SUB>dh</SUB>(Fl), S<SUB>db</SUB>(Fl) at a given frequency Fe to obtain the signal S<SUB>eh</SUB>, S<SUB>eb</SUB>, 4) transmitting the sampled signal S<SUB>eh</SUB>, S<SUB>eb </SUB>as well as the video signal S<SUB>vh</SUB>, S<SUB>vb </SUB>to a processing step so as to determine the initially received signal. The method can be applied to the demodulation of MSK, FSK, DPSK type waveforms.
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