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- W2599689815 abstract "A lot of research has been done to reduce the adverseeffects of multipath in order to provide accuratepositioning in navigation systems; however it still remainsone of the challenges. Most of research in the area ofmultipath mitigation has been focused on magnitude ofcorrelator outputs (I2 + Q2), which does not take intoaccount the phase delay between the line of sight (LOS)and reflected signals. Early late phase (ELP) proposed forthe multipath detection and estimation exploits this phasedifference. ELP is calculated as a phase differencebetween early and late correlator outputs. This phasedifference is dependent on the attenuation of the reflectedsignal with respect to the LOS and time delay between thetwo. However, it has been shown in this paper that thisphase difference is also dependant on various othercontrollable and uncontrollable parameters. The effect ofthese parameters needs to be analyzed in order tominimize false or missed detection of multipath. Thisprovided motivation for the work presented in this paper.As ELP is computed using correlator outputs, these arefirst analyzed followed by ELP analysis. The effect ofthermal noise, Doppler shift in carrier frequency, crosscorrelation, correlator spacing and ELP averaging periodhas been analyzed in this paper. The paper also presentsmathematical models for theoretical evaluation of ELP inthe absence and presence of multipath. Two kinds ofmathematical models have been presented, one which isextensive in evaluation but provides exact estimation, andanother which is easier to compute but provides a rougherestimate. A comparison of both models and experimentalresults has also been presented." @default.
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- W2599689815 date "2008-09-19" @default.
- W2599689815 modified "2023-09-23" @default.
- W2599689815 title "Analysis of Early Late Phase for Multipath Mitigation" @default.
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