Patent ID: 7280626

Claim:
A method for detecting a sampled signal having a carrier frequency that is within a frequency range and a delay within a delay range relative to a reference signal, comprising: determining a plurality of coarse frequencies within the frequency range; dividing the sampled signal into a plurality of data blocks, the number of data blocks being a function of the number of the plurality of coarse frequencies; determining a plurality of fine frequencies, each fine frequency being a function of the number of the plurality of coarse frequencies and the number of data blocks; calculating a first set of correlation sums for each data block, each correlation sum in the first set being based on the reference signal, one of a predetermined number of delays within the delay range and one of the plurality of the coarse frequencies; calculating a second set of correlation sums, each correlation sum in the second set being a function of the first set of correlation sums and a selected one of the plurality of the fine frequencies; and based on the second set of correlation sums, determining the carrier frequency and the delay.