GPS Multipath Signal Estimation Based on AllPhase DFT
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Graphical Abstract
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Abstract
The GPS multipath signal model is given
and analyzed. The all phase DFT (apDFT) is proposed
as a new spectral analysis way, which makes full use of
(2N ¡ 1) samples to do linear transform into N point se-
quence called all phase signal. Phase di®erence method is
integrated with apDFT to determine the accurate signal
frequency through calculating the two phase value for the
two sequences' DFT result, i.e. one is from point 1 to point
(2N ¡1) and the other is from (N +1) to (3N ¡1) separately.
The application of the proposed method on GPS multipath
signal estimation is analyzed, which has multiple frequen-
cies components. Monte Carlo simulation results based on
GPS simulator data show that the apDFT and the integra-
tion with phase di®erence method could give the accurate
frequency and precise phase estimation in both ideal and
noisy environments.
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