Method and Device for Compensating the Doppler Effect for a Digital Signal Receiver
OwnerJean-Luc Robert, Jean-Yves Le Naour +1inventors
InventorsJean-Luc Robert, Jean-Yves Le Naour, Jean-Francois Pintos
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Abstract
The invention relates to a method of compensating the Doppler effect for a mobile receiver. This method consists in producing a phase-locked loop based on the signal to be demodulated to correct the frequency control of the tuner element and thus the drift due to the Doppler effect. The invention also relates to a receiver implementing this method.
Claims6
Method of compensating the Doppler effect on a signal affected by a distortion due to the Doppler effect in a mobile receiver by the implementation of a phase-locked loop acting on the frequency control of the tuner element for selecting channels, based on the signal to be demodulated, wherein it comprises:
- a step for determining a signal corresponding to the image of the spurious modulation,
- a step for defining a signal corresponding to the sign of the Doppler shift, and
- a step for creating a tuner element (2) frequency correction data from the preceding signals.
Digital data receiver comprising at least one receive subsystem, associated with at least one antenna, and also comprising a tuner and a demodulator, wherein it comprises, upstream of the demodulator,
- means of processing the intermediate-frequency signal to be demodulated to determine a signal corresponding to the image of the spurious modulation,
- means for defining a signal corresponding to the sign of the Doppler shift, and
- means for creating, from the preceding signals, a tuner element frequency control data for correcting the frequency drift generated by the Doppler effect.
Dependencies are inferred from the claim text.