| 摘要 |
A method of determining a first coordinate value of at least one point with respect to a plurality of first sequences, each of the first sequences consisting of a repeating first codeword of a first cyclic position code, the first cyclic position code having length n<SUB>1 </SUB>and minimum distance, d<SUB>min</SUB><SUB><SUB2>1 </SUB2></SUB>the method including: obtaining, from each of h<SUB>1 </SUB>of the first sequences and at a position corresponding to the at least one point, a respective first subsequence of length w<SUB>1 </SUB>symbols, where h<SUB>1</SUB>>=2 and w<SUB>1</SUB>>=n<SUB>1</SUB>-d<SUB>min</SUB><SUB><SUB2>1</SUB2></SUB>+1; mapping each of the first subsequences to a respective codeword of the first cyclic position code; determining an offset, in the corresponding first sequence, of each codeword thus obtained, and thereby determining a respective one of a plurality of first offsets of the at least one point; deriving, for each of h<SUB>1</SUB>-1 pairs of the first sequences, a difference between the corresponding pair of first offsets, and thereby deriving a respective one of a plurality of first differences; and deriving, from the plurality of first differences, the first coordinate value.
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