Delay locked loop for use in a GPS signal receiver
First Claim
1. Delay locked loop intended to be used in a receiver of signals emitted by a GPS satellite, said signal including information modulated by a pseudo-random code, said receiver being adapted so as to search, during an acquisition phase, said GPS satellite to identify said pseudo-random code, comprisinga pseudo-random code generator (35) for generating a copy of said pseudo-random code of said satellite;
- a local oscillator (34);
a modulator (14) for modulating said copy of the pseudo-random code of said satellite coming from said pseudo-random generator (35) with the output signal of said local oscillator (34);
a plurality of signal channels (C1, C2, C3) each including a correlator (37 to
42) connected to the output of said modulator (14), a pass-band filter (48 to
50) connected to the output of said correlator and a signal detection circuit (51 to
56) connected to the output of said pass-band filter; and
a data processing unit (11) adapted, firstly, 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, secondly, adapted 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.
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Accused Products
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.
10 Citations
4 Claims
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1. Delay locked loop intended to be used in a receiver of signals emitted by a GPS satellite, said signal including information modulated by a pseudo-random code, said receiver being adapted so as to search, during an acquisition phase, said GPS satellite to identify said pseudo-random code, comprising
a pseudo-random code generator (35) for generating a copy of said pseudo-random code of said satellite; -
a local oscillator (34); a modulator (14) for modulating said copy of the pseudo-random code of said satellite coming from said pseudo-random generator (35) with the output signal of said local oscillator (34); a plurality of signal channels (C1, C2, C3) each including a correlator (37 to
42) connected to the output of said modulator (14), a pass-band filter (48 to
50) connected to the output of said correlator and a signal detection circuit (51 to
56) connected to the output of said pass-band filter; anda data processing unit (11) adapted, firstly, 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, secondly, adapted 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. - View Dependent Claims (2, 3, 4)
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Specification