GPS RECEIVER WITH FAST ACQUISITION TIME
First Claim
1. Signal processor for use in a navigation satellite receiver, comprising a plurality of tracking modules, for processing a plurality of navigation ranging signals, each tracking module comprising:
- a pseudorandom code generator, for generating a replica code sequence;
a correlator, for obtaining a time-integrated correlation value between a navigation ranging signal and said replica code sequence;
wherein said signal processor has a first functioning mode, and said signal processor is arranged to simultaneously dump said time-integrated correlation values from said multiplicity of tracking modules when in said first functioning mode.
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Accused Products
Abstract
Method for acquiring a plurality of GPS signals, in which the signals received from the space vehicles are correlated, in an array of parallel processing modules (20) with local replicas of a pseudorandom code. The local pseudorandom code generators are slewed periodically, on detection of an external periodical trigger INT_ACC, and the correlation data are dumped simultaneously to all processing modules in output registers for acquisition and tracking software. The integration period is shorter than the natural period of the pseudorandom code sequence, and all the local generators are slewed at the same time, thereby allowing a quicker acquisition of the SV C/A code.
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Citations
11 Claims
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1. Signal processor for use in a navigation satellite receiver, comprising a plurality of tracking modules, for processing a plurality of navigation ranging signals, each tracking module comprising:
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a pseudorandom code generator, for generating a replica code sequence; a correlator, for obtaining a time-integrated correlation value between a navigation ranging signal and said replica code sequence; wherein said signal processor has a first functioning mode, and said signal processor is arranged to simultaneously dump said time-integrated correlation values from said multiplicity of tracking modules when in said first functioning mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for acquiring a plurality of navigation ranging signals from a plurality of space vehicles comprising the steps of:
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correlating said navigation ranging signals with one of a plurality of local signals generated by a plurality of pseudorandom code generators, for obtaining a plurality of time-integrated correlation values; slewing said pseudorandom code generators until said local signals are time-aligned with pseudorandom signals contained in said navigation ranging signals; whereas said slewing of said pseudorandom code generators takes place simultaneously and periodically for all said code generators, with a repetition period which is shorter than the proper period of said local signals.
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Specification