| 摘要 |
A relay satellite receives, from ground stations, modulated high-frequency signals, lying in two different frequency bands. One of the modulations is narrow-band and the other wideband. The satellite retransmits a multiplexed signal (MX) resulting from the in-phase modulation, by signals drawn from those which bear the wideband modulation, of a pseudo-carrier (PP) consisting of the signal modulated by the said narrow band modulation. The user stations receive this multiplexed signal, and, by filtering, extract the pseudo-carrier modulated in narrow band, which can be made use of in order to demodulate, in phase, the multiplexed signal, so as to recover signals which carry the wideband modulation. <IMAGE> |
