Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1996-03-19
1998-04-07
Chin, Stephen
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
375208, 375373, 342357, 342463, H03D 324
Patent
active
057373744
ABSTRACT:
Delay locked loop intended to be used in a receiver of signals emitted by a GPS satellite, comprising a pseudo-random code generator (35), a local oscillator (34), a modulator (14) for modulating said pseudo-random code with the output signal of said local oscillator (34), a plurality of signal channels (C1, C2, C3) connected to the output of said modulator (14) and each comprising a pass-band filter (48 to 50). A data processing unit (11) is adapted to control the central frequency of the output signal of said local oscillator as a function of the output signal of said signal detection circuit and to control the central frequencies and the bandwidth of said pass-band filters (48 to 50) in several steps during said acquisition phase, so that said pass-band filters divide up, at each step, one of the pass-bands of the preceding step into non-overlapping pass-bands.
REFERENCES:
patent: 4809005 (1989-02-01), Counselman, III
patent: 4912722 (1990-03-01), Carlin
patent: 5062122 (1991-10-01), Pham et al.
patent: 5101416 (1992-03-01), Fenton et al.
patent: 5365550 (1994-11-01), Roberson
patent: 5400359 (1995-03-01), Hikoso et al.
Etienne Jean-Daniel
Farine Pierre-Andre
Jeanclaude Eric
Asulab S.A.
Chin Stephen
Roundtree Joseph
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