Phase correlator
AssigneeCompagnie Industrielle des Telecommunications Cit-Alcatel
InventorMichel Brouant
Life of this patent
Estimating the term…
Abstract
Phase correlator between a wave having a frequency of F sent out by an oscillator and a useful signal having the same frequency F and having a relative phase .phi..sub.0, comprising a first and a second modulator effecting the modulation of the useful signal having a high noise level by the wave out by the oscillator on the one hand through an adjustable phase-shifter of .phi. and on the other hand through the phase-shifter of .phi. followed by a fixed phase-shifter of .phi..sub.1, an adjusting circuit of .phi. by the error signal between the two preceding modulation signals coming respectively from two integrators and a third modulator effecting the modulation of the signal having a high noise level by the wave sent out by the oscillator through another phase-shifter of .phi.1/2 connected with the phase-shifter.
Claims4
A phase correlator for correlating the phase between a predetermined signal and a useful signal of an input signal, said predetermined signal and said useful signal having a same frequency F and a relative phase .phi..sub.0, said phase correlator comprising:
- signal generating means for generating said predetermined signal, an adjustable phase-shifter for applying an adjustable phase shift .phi. to said predetermined signal, and a fixed phase-shifter for applying a fixed phase .phi..sub.1 /2 different from zero to said predetermined signal,
- control circuit means for controlling the value of .phi. including first and second modulators, said input signal being applied to the input of each of first and second modulators, said first modulator modulating said input signal by said predetermined signal sent out through said adjustable phase-shifter of .phi., and said second modulator modulating said input signal by said predetermined signal sent out through both said adjustable phase-shifter of .phi. and a second fixed phase-shifter of .phi..sub.1, and comparator circuit means between the output signals from said first and second modulators for controlling the value of .phi., and
- modulation means for modulating said input signal by said predetermined signal sent out through said adjustable phase-shifter of .phi. and said fixed phase-shifter of .phi..sub.1 /2.
Dependencies are inferred from the claim text.