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AssigneeSiRF Technology, Inc.
InventorsAnant Sahai, John Tsitsiklis
Estimating the term…
Techniques are provided for synthesizing a long coherent I and Q correlation integral at a particular frequency by synthetically combining a sequence of shorter correlation integrals at the same or different frequency. Techniques are also provided for acquiring a carrier-modulated signal with an unknown shift of the carrier frequency, and possibly some additional unknown signal parameters. These techniques involve synthesizing coherent correlation sums at a fine frequency resolution, using coherent correlation sums that are calculated at a coarse frequency resolution. This approach allows for coherent processing of the received signal over an arbitrarily long time interval, while avoiding the excessive computational requirements of traditional methods.
A method for summing integrals at a target frequency of a plurality of target frequencies, the method comprising the computer-implemented steps of:
A method for summing integrals for a sampled data, the method comprising the computer-implemented steps of:
A method for summing integrals for a sampled data, the method comprising the computer-implemented steps of:
The method of claim 6, wherein calculating pairs of I and Q correlation integrals is performed coherently by using a navigation bit information when the I and Q correlation integrals are associated with a received signal that emanated from a global positioning satellite vehicle, and wherein the navigation bit information is associated with the global positioning satellite vehicle.
A method for estimating a carrier frequency at a target frequency, the method comprising the computer-implemented steps of:
Dependencies are inferred from the claim text.