Abstract
The symmetric phase-only matched filter (SPOMF) is studied in this paper for processing GPS signals. The use of phase-only information is equivalent to equalizing the magnitude spectrum in contrast to the original spectrum that tapers off according to a sinc-function. This tends to accentuate the high frequency components corresponding to edges or transitions in the signals. As such, the SPOMF produces a much sharper peak (ideally a Dirac delta function) that is more accurate in timing and less sensitive to multipath. In addition, the same operation is applicable to both a binary phase shift keying (BPSK) modulated signal such as the GPS C/A-code and P(Y)-code and a binary offset carrier (BOC) modulation such as the GPS M-code and Galileo codes. More importantly, it only produces a single matching peak regardless of which modulation code is used.
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