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AssigneeSociete Anonyme Dite Alcatel Radiotelephone
InventorFrederic Gourgue
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The present invention relates to a device for correcting a frequency shift due to the Doppler effect in a transmission system. The device for correcting a frequency shift due to the Doppler effect is applicable to a transmission system in which a signal is transmitted in a transmission lobe between a transmitter and a receiver that are in relative motion. The frequency shift which is the difference between the frequency of the transmitted signal as measured at the receiver and as measured at the transmitter is presented as the sum of a center frequency characteristic of the transmission lobe plus a position frequency which is a function of the position of the receiver in the transmission lobe. The device includes means for tuning the receiver which has a tuning frequency such that said tuning frequency is equal to the sum of the transmitted frequency plus the center frequency.
A device for correcting a frequency shift due to the Doppler effect in a transmission system wherein:
A device for correcting a frequency shift due to the Doppler effect in a transmission system where a signal is transmitted in a transmission lobe between a transmitter and a receiver in relative motion, wherein said frequency shift is the difference between the frequency of said transmitted signal as measured at said receiver and as measured at said transmitter, and is defined as the sum of a center frequency characteristic of said transmission lobe plus a position frequency which is a function of the position of said receiver in said transmission lobe, the device comprising means for tuning said receiver, which has a tuning frequency, to make said tuning frequency equal to the sum of said center frequency and said frequency of said transmitted signal;
Equipment for two-way communication by means of signals in respectively opposite communication directions, the equipment comprising a device for correcting a frequency shift due to the Doppler effect in a transmission system where a signal is transmitted in a transmission lobe between a transmitter and a receiver in relative motion, wherein said frequency shift is the difference between a received frequency of said signal as measured at said receiver and a transmitted frequency of said signal as measured at said transmitter, and wherein said frequency shift is also defined as the sum of a center frequency, characteristic of said transmission lobe, plus a position frequency which is a function of a position of said receiver in said transmission lobe, the device comprising means for tuning said receiver, which has a tuning frequency, to make said tuning frequency equal to the sum of said transmitted frequency and of said center frequency.
Dependencies are inferred from the claim text.