The Aid of Wavelets Correlator in Carrier Phase Multipath Reduction and Motion Detection

A. El-Ghazouly

Abstract:	Multipath is a combination of high, medium and low frequency errors that contaminate carrier and code measurements. Mitigation of multipath in the measurements domain is getting a lot of attraction by some researchers to be used in different applications, especially for geophysical monitoring purposes like seismology or for detection and removal of multipath errors at permanent stations. Recently, several approaches have been suggested to mitigate the impact of carrier phase multipath on GPS positioning results. The drawback of the current procedures is that they are only concerned about the isolation of a specific multipath frequency like the removal of high or low frequency multipath errors and there is no automatic procedure that can identify the required signal out of the contaminated one with different multipath errors. In this paper, a new automatic procedure is introduced based on the wavelets multi-resolution analysis to remove the multipath error and leave the required signal untouched. The use of wavelets transform will help in localizing the error in both time and frequency domain. The previous knowledge about the analyzed frequency is used in the wavelets decomposition to match the center frequency for the last level of decomposition, combined with the fact that the GPS orbits are repeated every one full sidereal day, is used to compute the cross correlation between the wavelets details coefficient at successive days. This combination is named wavelets correlator technique for multipath detection and mitigation.
Published in:	Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009) September 22 - 25, 2009 Savannah International Convention Center Savannah, GA
Pages:	2344 - 2351
Cite this article:	El-Ghazouly, A., "The Aid of Wavelets Correlator in Carrier Phase Multipath Reduction and Motion Detection," Proceedings of the 22nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2009), Savannah, GA, September 2009, pp. 2344-2351.
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