Method and apparatus for correlating a satellite signal with a reference code
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United States of America Patent
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Sep 21, 2004
Grant Date -
Apr 22, 2004
app pub date -
Sep 29, 2003
filing date -
Apr 23, 1999
priority date (Note) -
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Abstract
A method and apparatus for correlating a satellite signal with a reference code is described. In an example, samples of a satellite signal having a repeating code are received. At least one fast convolution between the samples and the pseudorandom reference code is performed. A correlation peak is detected within a result of the at least one fast convolution. A code phase of the repeating code relative to the pseudorandom reference code is estimated at the correlation peak. The samples are then correlated with the pseudorandom reference code using the code phase as an initial value.
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