Pulse Shape Selection for Navigation Systems in a Multipath environment

Alexander Steingass

Abstract:	This publication deals with the pulse shape selection for satellite navigation systems in terms of inventing the new european naviagtion system "'Galileo"' or the GPS modernisation. Based on a given band- width of 20 MHz two competitive candidates have been identified: A rectangular pulse shape chip rate 10 MChip/s (P-code like) and a root raised cosine pulse shape chip rate 16.7 MChip/s. These two competitors have been transmitted over the AWGN channel and multipath channels as well. The receiver has been selected as an standard narrow correlation receiver with a Costas PLL included. The results from these simulations are showing that in terms of pseudorange accuracy the root raised cosine pulse gains about ldB in comparison to the rectangular pulse transmitted over an AWGN channel. Transmitting over a multipath channel the gain for the pseudorange accuracy reaches dimensions up to several dBs. In terms of the Phase estimation accuracy there is no influence of the selection of the pulse shape. All simulations result in the same characteristics of performance. Since the only disadvantage of the root raised cosine pulse is the higher complexity the question arises wether the gain in accuracy should be waised to keep the complexity low. This question can only be answered by the system designers of the new navigation systems.
Published in:	Proceedings of the 2001 National Technical Meeting of The Institute of Navigation January 22 - 24, 2001 Westin Long Beach Hotel Long Beach, CA
Pages:	614 - 618
Cite this article:	Steingass, Alexander, "Pulse Shape Selection for Navigation Systems in a Multipath environment," Proceedings of the 2001 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2001, pp. 614-618.
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