Patent Document ID: 8462831
Application ID: 12508278

Base Claim:
1. A sieving system for a satellite-based navigation receiver comprising: a plurality of sieving search channels adapted to non-coherently integrate one or more coherent integrations of a correlation of a satellite signal with a corresponding plurality of first hypotheses to generate a plurality of non-coherent integrations; a plurality of sieving track channels adapted to track the satellite signal to generate a plurality of tracked satellite signals and to non-coherently integrate one or more coherent integrations of a correlation of the plurality of tracked satellite signals with a corresponding plurality of second hypotheses to generate a plurality of extended non-coherent integrations; and a peak selection module adapted to compare the plurality of non-coherent integrations and the plurality of extended non-coherent integrations to select a plurality of candidate hypotheses corresponding to a plurality of largest peaks from the plurality of non-coherent integrations and the plurality of extended non-coherent integrations, wherein the plurality of candidate hypotheses updates the plurality of second hypotheses for the plurality of sieving track channels to extend the non-coherent integrations or the extended non-coherent integrations corresponding to the plurality of candidate hypotheses, and wherein the peak selection module selects a largest peak from the plurality of non-coherent integrations and the plurality of extended non-coherent integrations to compare with a detection threshold and to declare a detection of the satellite signal when the largest peak exceeds the detection threshold.

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Claim 2:
2. The sieving system of claim 1 , wherein a search space comprises a plurality of groups of hypotheses, and the sieving search channels successively select each of the plurality of groups of hypotheses as the plurality of first hypotheses until the sieving search channels have selected all hypotheses contained in the search space.