Patent ID: 7486749

Claim:
An apparatus for determining a correct code phase of a received, code modulated carrier signal, said apparatus comprising: a correlation portion configured to provide correlation values for different possible code phase offsets between the received, code modulated carrier signal and an available replica code sequence; a frequency compensation portion configured to compensate in the correlation values output by said correlation portion a plurality of possible frequency offsets; a coherent memory configured to coherently accumulate during a respective coherent integration cycle correlation values provided by said frequency compensation portion for a respective combination of a specific code phase offset and a specific frequency compensation; a non-coherent memory configured to non-coherently accumulate during a non-coherent integration cycle the correlation values accumulated in a respective completed coherent integration cycle in said coherent memory for a respective combination of a specific code phase offset and a specific frequency compensation; and a mapping portion configured to map a correlation value which is to be added to one of said coherent memory and said non-coherent memory to a respective position in said coherent memory or said non-coherent memory, respectively, which position is associated to the combination of the specific code phase offset and the specific frequency compensation for which said correlation value is provided, and which position is adjusted depending on at least one of a frequency compensation applied by said frequency compensation portion in combination with elapsed integration time and a drift of a frequency offset in the correlation values output by said correlation portion.