Positioning and Navigation with Ultra-Wideband Signals

Huilin Xu, Liuqing Yang, and Y.T. Jade Morton

Abstract:	The Cramer-Rao Bound (CRB) analysis shows that ultrawideband (UWB) can provide high resolution timing and positioning, thanks to its huge bandwidth. However, in practical implementation, the CRB can not be achieved because the perfect channel information may not be available at the receiver. In this paper, we investigate how to exploit the huge bandwidth for high resolution ranging in practical scenarios. We will compare the coherent and noncoherent combining of the multi-band signal for ranging. The comparisons show that a high timing resolution can be achieved by combining the channel information from multiple sub-bands in a coherent manner. However, when the channel is independent for different sub-bands, the multi-band signals can only be combined in a noncoherent manner to improve the mistiming performance. In particular, the slope of the probability of mis-timing curve becomes steeper as the number of sub-bands increases. This is known in communications as diversity. Simulations are also carried out to corroborate our theoretical analysis.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	1861 - 1866
Cite this article:	Xu, Huilin, Yang, Liuqing, Morton, Y.T. Jade, "Positioning and Navigation with Ultra-Wideband Signals," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 1861-1866.
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