Characterization of the effects of high multipath phase rates in GPS |
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| Authors: | Joseph?M?Kelly Email author" target="_blank">Michael?S?BraaschEmail author Michael?F?DiBenedetto |
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| Institution: | (1) Avionics Engineering Center, Ohio University, 322D Stocker Center, 45701, Athens, OH, USA, |
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| Abstract: | GPS multipath has been studied since the early 1970s. Prior to the investigation described in this paper, however, the effects
due to the relative Doppler shift between the direct and multipath signal components have received scant attention. The single
previous study that did address the issue indicated coherent receivers had significant performance advantages over noncoherent
receivers. Specifically, it was stated that under the condition of fast-fading multipath, noncoherent receivers would yield
a bias error, whereas coherent receivers would not. After reviewing the background theory, this paper describes a revised
model of the phenomenon and shows the results of hardware simulations which validate the existence of the bias in both receiver
types and offer support for the new model. A case study of a specific commercial receiver is presented.
Electronic Publication |
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